75 76 Overhaul
75 76 Overhaul
75 76 Overhaul
REPAIR-OVERHAUL
AGRICUTTURAL TRACTORS
mod.t5
mod,tr
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MAIN OFFICE 42045 LUZZARA (Resgio Emitia) - tTALy Tet. (0s22) g3511312161298
i ttAccHlNE .J ^RICOLE
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; CHAPTER
I
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INDEX
Page
INTRODUCTION
DESCRIPTION AND
F F
;
INTRODUCTION
1.1 1.1
1.'l
CHAPTER II
PRINCIPAL ADJUSTMENTS
GENERAL
F
E
;
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_ CHAPTER III
INTRODUCTION 2.1 ADJUSTIVIENT OF THE ACCELERATOR CONTROL AND OF THE ENG INE SHUT-DOWN CONTBOL .2.1 _ ACCELERATOR CONTROL .2.1 _ ENGINE SHUT.DOWN CONTROL .2.1 ADJUSTMENT OF THE CLUTCH CONTROL PE DAL 2-1 ADJUSTMENT OF THE FOOT BRAKE PEDAL AND THE HAND BRAKE - ADJUSTMENT OF THE FOOT BRAKE PEDAL (Mod.75) 2.1 ADJUSTMENT OF THE HAND ERAKE (Mod.75) 2-1 _ ADJUSTMENT OF THE FOOT BRAKE PEDAL AND THE HAND BRAKE . 2-2 ADJUSTIIIENT OF THE SHOE _ OPENING , 2.2 ADJUSTMENT OF THE DIFFERENTIAL LOCK . 2.2
(l\4od.76)
ELECTRTCAL
SYSTEM SYSTEM
CAM CONTROL
BATTERY
. , .
I
I I
s1
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&1
Soction
CLUTCH
Ov.rhaul Bemounting - Replacement ot the engine oil ssal - Adjustment of the stroke of the clutch lork Troubles and remedies Soction Dismounting the clutch spring disk and friction
disk
. 3-3 . C3 . g4 . &5 . gs
3-7
33
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ll
FRONT
Special
nore
Ovorhaul
u
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Dismounting part I - front gear train Dismounting part ll - front djJferential Remounting part ll - lront differential - Remounting part ll - gears - Remounting part ll - differential Remounting part I - front gear train Troubles and remedies
. . .
.39
.
3.7
3.10 .3-13
,3_14
,314
.3_14
.3-i6
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Page
Section
lll
ARTICULATED JOINT
Overhaul Dismounting - Oismounting of the difterential bevel gears - Dismounting of the power take-off reduction gear box -. Remounting Section V WHEEL HUBS
Overhaul (tractor Mod.75)
.3iZ1 .?21
.3-21
.3-A1
'-f22
Dismounting Remounting
, .
?25
3.25
Overhaul (tractor Mod. 76) . Dismounting the wheel hubs - Dismounting the wheel reduction
,&28
.3-25
Remounting
gBsr
,32S
,g27
.g.27
Dismountingofthesteringbox
Dismounting of th6 ErticulEting srms Romounting of th rrticulsting arms Romounting of the rtesring box
. . . : : : : : : : : . : : :l;3
.g3O .3.30 ,&31
Srctlon
Vll HYDRAULIC
SYSTEM
.
Overhaul lntroduction
Checking operating pressure vslues - Steering wheel working pressure values , - Hydraulic power litt working pressure values {Mod. 75) - Hydraulic power lift working pressure values (Mod.76) - Checking bypass valve pressure : Fleplacement of the hydraulic return filrer cartridge Hydraulic system schematics
g33
&33
3.34 &3S
.3.3S
-SoctionVlllHYDRAULtC
POWE R
LtFT
.339
.3.39
.3_39
.3-40
.3-41
with hydraulic
steering
F F F" F F F
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oEscRtprtoN ANo rEcHNtcaL cHARActERlSTlcs
CHAPTER
INTRODUCTION
This publication is the Repair and Overhaul Manual for the agricultural tractors "Ferrari 75" a d"Fertati76", manu{actured by the FERRARI Company - Agricultural Machines - Luzzara, Reggio Emilia (RE), ltaly. This prJblication contains the instructions for the dismoun'
The manufacturer
reserves
by commercial
con"
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E
the principal adjustments and any other similar operation. As a general practice in the various operations ot dismounting, remounting or adjustment, the machines have been subdivided into the lollowing eight groups:
Oualifying technical characteristics: These are agricultural tractors, centrally articulated lor total traction on four wheels of equal diameter.
I I
_ _ _ -
CLUTCH FRONT OIFFERENTIAL AND GEARS ARTICU LATED JOINT REAR DIFF ERENTIAL WHEEL HUBS STEERING (mechanical)
Clutch: Single dry plate, adjustable. Gears: 7 forward speeds, 3 reverse; all controlled by
one lever.
Notd
Unless otherwise indicated the data and instructions contained herein are valid for both machines.
76, Danfoss hydraulic system: with perfct maneuverability even under adverse conditions. Mod. 75, hydraulic or mechanical worm steering gear with a steering angle of 35o.
Stosrin0: Mod.
Whoolt: 4-wheel drive with pnumatic tires 7.50.18 or 9.5-20 for Mod.76, and 6.00-16 or 7.50-16 for Mod,75. Diflrsntial: On both axles with locking on rear and front axles for Mod. 76 and on the front only for Mod.
75.
T
ld
Note
When replacement parts are ordered, always state the model and serial number of the tractor
concerned.
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SPECIAL NOTES
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The term RIGHT and LEFT, as used in this manual to locate the various components, are referenced to the tractor as viewed by the operator seated in the driver's seat.
ofth traclors
1-1
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OESCRIPTION AND TECHNICAL CHARACTERTSTICS
lor Mod.75.
Service brake (loot brake - pedal): Operates on all 4 wheels for Mod. 76. Operates only on the tronl wheels
Emergency and parking brake (hand brake -
Tool lifring: Hydraulic. with automatic adjusrment for depth and stress with connections at 2 and 3 points. Trailer coupling: Road usable approved towing of single axle trailers.
lever): O, perates on the rear wheels for l\4od.76 and the front wheels lor Mod.75.
Electrical system: '12 Votts for srarring and lights. Rechargeable battery, permanent magnet alternator with
for Class B,
lnstluments: Hour meter, tachometer (engine and power take-oft), warning lights: insulficient oil pressureJ
generator, lights, reserve fuel.
charging Power
headlights. Directional signals and brake lights only for Mod. 76.
at
tools
at two
connecting
forward speed, range of use {rom 540 to 630 RpM,s and from 790 to 910 RPlvl's for Mod. 76 and range of use trom 550 to 640 FPN4's and from gOO to 930 RpM's tor Mod, 75. lf requested, synchronized power take-off at all speeds ({orward and reverse) for wheel-driven trailers
may be installed.
ot
the
Plough: one-furrow - two furrows Towed or wheel driven trailer. Back cutting mower bar. Towed sprayers,
Spading machine
swivel.
lr.igation pump.
Spray pump,
1-2
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PR I NC
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CHAPTER II
PRINCIPAL ADJUSTMENTS
GENERAL
INTRODUCTION
Some
of the principal
outside the machine without dismounting of any compo' nents. The Iollowing paragrapht contain the instructions tor such adjustments.
ll
lf the clutch does not release completely or if the idle stroke becomes excessive (more than 15 mm), adjust the control rod by acting thereon until the idle stroke of the pedal is slightly less than 15 mm; then fasten the locknut securely. lf the adjustment in the play of the clutch pedal is not sufficient to establish perfect functioning conditions, see Chapter lll under item CLUTCH OVERHAUL.
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H
lf there is a malfunction of the accelerator or engine shut-down controls, proceed with the adiustment of the
cables
ACCELERATOR CONTROL
Adjust the screw (3, fig, 2-1) after having loosened the
respective locknut,
pedal
Adlust the screw (4) aJter having loosened the respective locknut,
Note
Ascertain, after the adjustment has been made, that there exists approximately 10 mm of play between the rabbet (5) and the limit stop (6).
a.
b. Tishten the adjustins nut {1, fig. 2-2) until the idle
stroke ot the pedal is less than 20 mm.
I I
lf the action of the hand brake is inefficient, adiust the control rods (3, fis.2-2) as follows:
a.
Loosen the locknut (2, fig,2-2).
lever
ld
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Note
Fig, 2-1. Adjudm.nr of tho lcclorltor coritrol of rho ngine 5hut down conrrol
.nd
Adjustment of the rods (3, 4; fig.2-2) must be made simultaneously when regulating the brakes.
ii
2-1
:f :tal
:
PRINCIPAL ADJUSTMENTS
1. Adjusting nut
@t
Fle.
4. Left brake rod 5. Shoe-opening control lever 6. Shoe-opening cam 7. Brake shoe 8nd lining 8. Brske drum Adjusting cable 10. Hand brake lever
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PRINC IPAL ADJUSTMENTS
rt
not sutficient to establish the condition of perfect functioning, see Chapter lll, under item TBOUBLES AND REMEDIES - FRONT OIFFERENTIAL AND
TRASMISSION UNIT.
adjusting the nuts (1, 2;fig.24) after having previously loosened the respective locknuts, lf the adjustment is
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Note
Adjustment of the hand brake is effected simultaneously when the foot brake adjustment
is made.
ELECTRICAL SYSTEM
The eletrical system of'the tractor is supplied dJrrent from one 12 V. 45Ah. battery. The figures 2-S and 26 show the wiring diagrams for tractor Mod. 75 and Mod
76 respectively.
WARNINO
After adjustment, if the front wheels of the tractor have more braking action than the rear
wheels or vice versa, adjust the brake cable (9; lig. 2-3) for the rear wheels. See also ligure 2-4.
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I I
LIGHT SYSTEM
lf the headlights,
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should not function, verify the condition of the respective fuses (refer to the scheme for the respective tractor), The fuses are located in a box in the battery space under the hood,
The batrery is accessibte by lifting the hood of the machine. To insure efficient output from the battery it is necessary to verify periodically the lsvl of the electrolyte, refill with distilled water 8nd protect the
terminals with a coating of vaseline.
a.
rods
{3, 4).
b. Loosen the shoes (7) lrom the shoe-opening cam (6). c. Rotate the cam (6) onetooth in the direction of the
shoe'opening control lever {5) while keeping the said
d.
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Reconnect the rods (3, 4) and readjusr the brakes so that the brake pedal has an idle stroke ot less than 20 mm.
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lf it is difticult to engage the locking device of the differential, regulate the control cables by properly
Fie.
2-3
2-?
I:
PRINCIPAL AOJUSTMENTS
=6
rEl. ii :l o>OllAG(,il
ll ll
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<gE=zcr>!
Fig.
75)
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'RINCIPAL
AOJUSTMENTS
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2'5
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PRINCIPAL ADJUSTMENTS
l.
Lett headlight
2. Right headlight 3. Starting motor 4. Engine oil pressure 5. Horn 6. Battery 7. Alternator 8. Fuses
1.
Headlight signal
gauge switch
12. I nsufficient oil pressure signal 1 3. Switch for lights and horn 14. Key switch for ignition, settirfg of
engine starting
services and
Voltage regulator
reserve signal
10. Fuel
15. License.plate light 16. Lett tait tight 17. Righr tail light 18. Fuel reserve signal switch
19. Spare signal for special installations
1. L6ft hs8dlight 2. Right hesdlight 3. Turn indicators 4. Horn 5. Engine oil pressure gauge switch 6. Fuel reserve signal switch 7. Starting motor 8. Battery 9. Alternator
10.
1
t8ctor dir6ction
indicators
18. Flasher
19. Switch tor turn indicators and flashing light 20. Switch for lights and horn 21. Key switch fo. ignition, setting of services,
and engine starting
Fuses
Fuel reserve signal 12. Spare signal for special installations '13. Headlighr signal 14, Signal showing insuflicient engine oil pressure 15. Signal showing trailer direction indjcators
1,
23.
License-plate light
operating
2-6
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OVERHAUL OF THE TRACTO R5
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DISMOUNTING OPERATION
CHAPTER III
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;
havg
to b6 madg
as
It
indicated.
The pieces must be washed, as indicated in the paragraph under "DlSi,lOUNTlNG OPERATION", and dried with clean, lintless cloths or with an air hose,
It
H
oJ wrenches, hammers. chisels and improvised tools of any other kind. Only by using the proper tools and
equipment, and only by using them for their proper purpose, is it possible to eftectively overhaul the machine without damage and with speed and safety.
It the remounting of one group has to be put aside tor a period of time, it is necessary to preserve and protect
When dismounting any part ot the machine, be sure to lay out each part in the same sequence as it was dismounted to prevent conlusion when remounting.
rhis group by placing it in a dust-proof container, ln every remounting alwayt ute new ga3kstu, cottet pinr, and !eal! and replace other parts showing wear or which may have been damaged during the dismounting
operation.
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- ln the
operations
observe the utmod cleanliness. lt would be wise to use two containers with either kerosene or gasoline;
ol
dismounting
or
remounting
OF
using the
rl I
rn
causes of troubles have been omitted becsuse the operator may easily identify them.
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II
sEcTtoNr --> sEcTloN ll + SECTION lll -+>SECTION lV + SECTION V .-+SECTION Vl -> SECTION Vll -"+ SECTION Vlll .+
FEAR
DI
FFERENTIAL
?4/s-2.
7.-11?-"
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CLUTCH
SECTION
I
CLUTCH
OVERHAUL
PRELIMINARY OPERATIONS
H lll H
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ln order to reach the clutch bell-housing follow the opration listed below.
b. c. d, e. l. g.
Disconnect the headlights, Remove the oil tank.and the air filter cartridge for the engine {only for Mod.75 which is provided with
lil
H
Remove the electrical cable of the pressure switch and the two cables of the voltage regulator.
Disconnect
connections.
reserve indicator
II It II II f;
h. Dlsconnect the hour meter/tachometer cables. i. Disconnect tte inlet and outlet hydraulic tubes and collect (in a clean basin for later re-use) the
hudraulic fluid coming from the tubes and the tank.
Note
ln the event that is is unnecessary to remove the oil from the tank, disconnect the inlet and outlet tubes and raise the open ends above the level of the tluid in the tank. Temporarily secure these tubes in this position by means of a string, wire, or other device.
Fig.
32.
j. k. l.
m. This operation does not require any particular knowledge, lt is only necessary to remove the six bolts which hold the spring disk in place (see figure
3-.1
).
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to the engine to keep it in position. Then remove the six (6) bolts of the clutch bell housing. Remove the engine.
REMOUNTING
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cLulcH
much care in order to avoid damage to or rapid wear of the thrust bearing (1; fig. 3.2) and o{ the clutch disk (1; fig. 3-3), lt is absolutely necessary to center the clutch disk {1, fig.3-3) and the spring disk (2; fig.3-3) beJore inserting and tightening the bolts,
c. Betore installing the new gil seal put a coat of adhesive on the outside oi it. Then, using a small plug, guide the new seal into place. AJter installing
the shalt strike the new sal, at throe or tour pointt along its circumference, with a sharp or pointed tool to insure that the seal is seated tightly in the clutch
bell housing.
ln
order
to
to
it
is
necessary
J.J'.
Note
It is possible to replace the spare main shaft with a centering pin dimensioned as indicated
in figure 3-4. Rplacsm6nt of the ongine oil rsal
a,
Remove the thrust bearing (1 ; fig. 3-2) and the clutch fork (2; Iig.3-2).
b. Position the puller (1; fig.3-5) on the engine pinion and fully tighten the nut (2; fig. 3'5). Turning the
puller nd {3; fig. 3-5) extract the oil seal (4; fig. 3'5),
Fig.
roal
Note
The puller for the oil seal csn only bo obtainod
Jrom
F
ER RAR
l.
Fig.
3-4
'4'4
ET
;l b
:a
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CLUTCH
H H H H H H rr
L.
lf the clutch does not completely disengage and the idle gtroke of the clutch pedal is insufticient to re-establish perfect lunctioning conditions, insen a shim (1; fig.3-6) between the clutch bell housing (2; fiq. 3-6) and the
Note
Also see figure 3-5 tor more details.
l.
lnsufficient idle stroke oJ the clutch pedal. Reestablish the idle stroke by adjustment ot the control lever nut (maximum pedal idle stroke, ZO mm),
Note
Eventually it may also be necesssry to replace the clutch disk.
Remount correctly,
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ncomplete disEngsgement,
1. Excessive clutch pdal idle stroke. Restablish the idle stroka (about 20
mm).
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IJ
Note
It ths clutch pedal idla strok ls not suffici8nt to rest8blish perfect functioning conditions, it mssns that ths stroke of tha clutch fork (4; fig. 3-6) is too shon. Extend ths strok ot th6 clutch fork by properly insrting I shim (1; fig.3.6) between the
clutch bell housing (2; fig. 3-6) and ths spherical headed clutch release pin (3; fig.3-6).
2.
Noises in the clutch bell housing.
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til
1.
inside
disk.
to the thrust bearing caused by the infiltration ot dust. Wash the of the clutch bell housing and replace the bearing and the friction Note
TI
3.5/3-6
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FRONT.DIFFERENTIAL AND TRANSM ISSTON UNIT
H
FT
sEcTloN
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and
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F
:
consisting of the following two parts, physically separated as to defining components by the intermediate plate, will be set forth herein as follows:
Unit"
Part
gear).
nents
l, or the front gear train (the defining compoof which are the reverse gear and the idling
Part ll, or the frontdifferential (the defining components of which are the diflerential, gear shift forks
and levers).
Fig.
37.
OVERHAUL
Proliminary opsrations
a.
EI
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c.
Il H H
Disconnect the electrical connections to the dash panel. Particular attention should be paid to the dismounting of the light switches, the horn and the ignition switch. Remove the dash panel (see figure
3).
d.
t'9. 3-8.
as
B6movar
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Take out the four set screws of the battery casing and remove it together with the attached hydraulic fluid tank (1; Jig. 3-10), after having drained the tank and tubes.
Remove the clutch control rod (1; fig. 3-l 1) and the ditferential lock (2; fiq.3-11).
Take off the battery case brackets and take out the gear box cover set screws (see figure 3-12).
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wooden blocks.
Fig.
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3.7
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FRONT.OIFFERENTIAL ANO TRANSM I55ION UNIT
Flg.
Fig.
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FRONT.OI FFERENTIAL AND TRANSMISSION UNIT
ns
DISMOUNTING PART I _
TRAIN
FRONT GEAR
Replace
o
Note
FI
this
gasket during
the
remounting
k. Atter
having drained the oil irom the housing and after having removed the respective eight set screws, take oif the clutch bell ho0sing {see figure 3-14). Use a wooden mallet.
peration.
nr
Note
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It the
remove the clutch bell housing, use a heavier tool with caution to avoid damaging the
It the gear bearing at the reduction end ol the bell housing remains in place, break
through the cap nut to extract it.
t.
the main drive shaft bearing (1; fig.3'15) and the idling gear bearing (2;iig. 3'15) as indicated'
Remove
Ease
out the reduction bell gear (1; fig. 3'16) and the reverse gear (1; tig. 317) with its relative washer (2;
lpar.nd wdh.r
fis.3-17).
n.
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ra
Extract, as indicated in ligure 3'18, the gear (1; Jig. 3-18) and the gear (1;fig.3-191, Ease out the driving pinion (2, f ig. 319) with its bearing.
Loosen the lock nut ol the control lork of th Psrt I sliding gssr ss indicated in figure 3'20 and sxtrEct
I rr
Looin the two lock nuts (1; fig. &22) support of the control rod (2, fig.3'22).
ol
tha
TekB out the two lock nuts of the intermedists plat (1, fig.3-23) and remove it with its respective gasket.
la
l. ln
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IT
Fig. Fig. 3
3'19.
Removal o{
th. idling
gsar
1I
3-9
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FRONT.DI FFERENTIAL ANO TRANSMISSION UNIT
FRONT
Take
off the
nuts
speed
selector rods and remove the respective {orks (2; fig. 3.24). f. Extract the speed selector rods
{1 ;
tigure 3-24).
fig. 3-29).
Note
ln this case, the complete differential group can be removed from the top or through the front opening, ln figure 3-25, the removal oI the group is shown as for the case in which the overhaul does not include the removal of any other part such as the intermediate plate. or the
housing cover.
d.
Only loosen the bolts holding the gear box 10 rhe articulated joint (1; fig. 3-26); carefully separate the gear box and the articulated joint and then remove the socket-head bolts (1; Jig. 3-27). Then take out the bolts (1; Iig. 3'26) and detach the complete
!h. .p..d
Fie.
320.
Fis.
3.10
FI
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FRONT.OIFFEFENTIAL AND TRANSM I5SION UNIT
Fr
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I I
Note
Pay particular alrention thai the spr ngs and poppet balls localed in lhe hoLes indicated in , :-., 3 ?i. ...,d . . o,ve ,L^ e(n-. rods ar not lost.
small cap at the end of the main drive shaft (1 ; fig. 3 30), exlract the.retaining ring (2; fig. 3-30), remove the roller bearing (3, fig. 3-30), and take oLrt the shaft (l ; iig 3 30).
h.
Take off the spacer (1; iig. 3-31) and the retaining ring (2, tig.3-31).
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Fis. 3.26. Loossnins ol rh6 lock nuts of tho articulatod joinr
til
kn
II
Fig.
th.
msin driv!
.h!ft
3.1
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iE
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FRONT.OI FFE RENTIAL AND TRANSMISSION UNIT
Extract both the retaining ring located behind the first gear and the retaining ring located behind the
last gear (see figure 3-32).
t.
Note
The bearings located on the other end of the
shaft will remain in place and may be extracted trom the top together with the low gear for the rmplement power take-oft which remains inside
Using a wooden mallet, remove the shaft with the complete gear train and extract it through the top (see figure 3-33).
Remove the counter shaft (see figure 3-34). Unscrew the nuts (1 ; f g. 3 35) and remove the {orks
k
t.
(2; fiS. 3-35) of th power take-off rod on each of the relalive spacer (3; iiq. 3 35).
side
Unscrew the nuts (1, 2; fig. 3-36) and remove the springs and poppet bal s of both the power take-off control rod and the f.ont differential and lransm s s on un t control rod Take out bolh rorl!
n,
Rmove the o I seal (1;fig. 3.37) and the retaining ring (2; tig. 3'37) from the power take-off shaft (3; fig. 3-37) and. tapping with a wooden mallet from lhe inside, extract the shati with its relative bearing
{4; fig.3-37).
I
Fis.
3-33 Romov.l of
th
compl.t.9.sr trrin
th Dinion
rhrft with
spac6r
Fig.
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FRONT.DI FFE RENTIAL ANO TRANSMISSION UNIT
h/
IT
FRONT
as
in the reverse order to that indicated tor dismounting. Always replace, grommets. seals. and any other components showing operational wear or which have been damaged during dismounting. During remounting, pay particular attention to the tollowing:
possible.
I T rr I
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Flg.
rr
la ll ll
II
1.
shims
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WANNING
After mounting, the counter shaft 11) must be
have a slight axial play, checkable at point (2) and at the other end ot the shaft (not shown). To vary the play, increase or decrease the number o{ shims (3) locatd belween the bearings.
wAnNtNc
Adjust the control forks of the power take-otf (2; fig.3-35) so that the travel of the gears (4) is unlform in both directions. li the travel is not uniform, excessive friction will be produced on
one side of the gears.
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t kloft
3-13'
IT
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I :
FRONT.OI FFERENTIAL AND TRANSMISSION UNIT
REMOUNTING PART II
GEARS
The counter shait (see Jigure 3-34), must have a slight amount of play as indicated in figure 3'38. lf such play cannot be obtained normally, it will be necessary to vary the number and/or thickness o{ the shims
3-39) and the differential housing (2; fig. 3-39) or between the bearing and the retaining ring (3; fig.
3-39).
ln,
I-
FRONT
Adjust the control forks {2; fig. 3-35) o{ the powr take'ofj as indicated in figure 3-38. (WARNING 2)
Observe the general ruJes for remounting previously stated, wirh parricular altention to the foljowing:
REMOUNTING PART
II_
DIFFERENTIAL
Mount the two wheel hubs and tighten the respective lock bolts. lnspect to see the number of shims that it may be necessary to use between the bearing (1;fig.
The main drive shaft {see figu're 3-15) must always be mounted with the longest end toward the clutch bell housing and the shortest end inside the gearbox.
\_-/i
AX LE SHAFT
Fiq.3-39. Adjustmnt of ths play o{ the difiBrontisl b6v6l gar and lhs bv.l pinion
3.14
ril
FI n{ FI
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I:
FRONT.OI FFERENTIAL AND TRANSMISSION UNIT
Ascertain that, after assembly. the reverse gear (see figure 3-20), slides easily along the shaft, and that the reduction bell gear {1; tig. 3-16) meshes perfectly with the idlins gears (l;lig.3-21).
Adjust the control forks of the sliding gear as indicated inligure 3-39a.
!l
l\4ounlthe reverse gear (1; fiq.3'17) so thatthecollar of the bushing faces the clutch bell housing.
nr
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ADJUSTING
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WARNING
Adjust the fork 11) of the sliding gbar (2) so that the travel is uniform in both directions. It lhe travel is not
un form, xcssivs triciion
of lho gar.
FiC.3'39a. Adjuttmbnr ot
ln
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1I
3-15
:a
:t^t :
FRONT.DI
'F:RENTIAL
TROUBLE
Difticulty in
gear shifting.
Note
The lever is deformed when the neutral position does not exactly correspond to the selector indicator. With the lever deformed, it is not possible to engage the LO or Hl ranges of speed.
2.
Excessive play between the gearshift lever and the small selector control lever. Replace bolh leve's.
Replace the lever,
work) the
Note
The lever is deformed when the neutral position does nor correspond exactly to the selector indication. With the lever deformed, it is nc'. possible to ngage the Hl or LO ranges ol
speed.
WATNINC
When rsplacing the losding spring for ths poppets, bcauso thg 3prings sre worn or broken, be sure thE new rpring3 are oi tha pro.
per l6ngth.
3,
Excessive wosr
of a b!ring or
Not
ll the foregoing problem occurs too oftsn, lt wlll bB n8cssssry to dismount the gsor st involved End roplEc thsm.
stlflnoss ot th rpssd rEloctor
trol
lvsr'
con-
1, Lack of
2. Selzlng of the 3olsctor rod control pln. Dlrmount thg l!v!r rnd thr control pin, Clean by removlng tho rult whlch hrs formsd rnd lubrlclto,
Nots
Pay particular attention to the lubrication of the pin bocsuse excessive grease may cause the tailure of the lubricstin0 tube.
Traction only
wheels
by lront or rear
2.
3.
3.16
FI
FT
:l :J^l :
FRONT-DIFFERENTIAL AND TRANSM ISSION UNIT
F{
TROUALE
The diflerential cannot be
FI
locked.
1. Control cable broken or loose. Check the tension ot the cable and reset it or replace the cable.
Fail:]re of the splined coupling oI the differential box. Replac the box,
Replace the spring,
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3.1713-18
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OVERHAUL
Prsliminary oporation
:a
:rt^l :
ARTICULATEO JOI N'
SECTION III
ARTICULATED JOINT
a.
I I
ll
- FRONT
six
Note
The socket head bolts can be removed from the
ra
T H ll
inside of the joint without dismounting any other components of the joint itself. Use a wrench lor socked head bolts of appropriate
length (about 2 feet).
Fie.
340. Pr.limin!ry
DISMOUNTING c. Take oft the two tootboards from the body of th articulated ioint removing thE four lock bolts, d. Operating as indicsted in figuie 3-40, loosen the lock nut {2; fis. 3-40) then remove the set screw that
rstalns the threaded ring (1).
la
Take
3-41.
as shown in Jigure
rI rI rI 1{ rI
1ll
Pay attention. when removing the threaded ring, (1;fig.34'l), not to loie the balls placed
in its seal.
Fig.
341,
It
further disassembly is required, take oft the cover (1; {iS. 3-42) and remove the retaining ring (2; fig. 3'42), the bearing {3; lig.3-42), and the pin (4; fig. 3-42). Perlorm the same operation on the group on
the other side-
REMOUNTING
Observe the general rules for remounting, as previously stated, paying particular attention to the following:
Belore tightening the set screw (see figure 3,40) of the threaded ring, ascertain that the threaded ring is
sdcurely bedded and that no play exists.
Fig.
319/3-20
FI FI IY FI FI
:. :J t :
REAR OIFFE RENTIAL
SECTION IV
REAR DIFFERENTIAL
OVEBHAUL
Preliminary operation
II
Itl
a.
Remove the seat and the tenders from the tractor and all components of the hydraulic power lift for access to the rear differential. (See paragraph "HYDBAULIC POWER LIFT. DISMOUNTING").
arms
ll
c,
(see figure
in
Fig. 3-43, Rohovsl of the hilch linksg
t{
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FI
paragraph "ARTICULATEO JOINT OISMOUNTlNG", after having detached the srticulated joint from the transmission casing (see paragraph "DlSMOUNTING PART II . FRONT DIFFERENTIAL", oPeration "d".
hubs.
eppon .rmt
Note
;l !l Il I H
For access to the di{ferential of tractor Mod. 76, sltor having removsd ths 0ntir6 whool hub!,
Fi9.
344. R.movll
ot th
r.!r dift.r.ntill
cov.r
a,
Bend back the opening-tabs of the lock washer (1; fig. 3-45) and remove the nut (2; fig.3-45), the spacer (3; fig.3-45), and seals (4; {i9.3-45).
m
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rt
DISMOUNTING OF THE POWER TAKE OFF REDUCTION GEARBOX (Only lor tractor Mod. 76)
rll
a. Take out the 4 bolts (l; fig.3-46) of the box of the power take-off reduction gearbox (2; fig. 3-46).
Remove the gearbox.
Fig.
345.
3-21
:z :J^l :
REAR DI FFE RENTIAL
a. Take oif the oil seal (1; {ig.3'48}, the retaining ring (2; fig. 3-48) and the split retainer ring (3; fis.348).
l;
fig. 3'49).
345) after
Pay great attention to the extraction of the pinion shafl (1; lig. 3-49) from the box so that no needles are lost or damaged. The exact (2; fig. 3-49) number of needles is 108.
having tightened the lock nut (2, lig. 3-45), be sure to ascertain that the tapered bearings are well set by tapping both ends of the shaft with a wooden mal-
let or rawhide or plastic mallet. Afterwards bend the nearest tab ol the lock washer (1 ; fig. 3-45), into one ot the slots of the lock nut (2; fig.
3-45).
REMOUNTING
Observe
cited
Adjust the rear differential bevel gear set using the same procedure as for the adjustment of the front
differential bevel gear set.
Fig.
346. R!movll
Fig.
349.
Fig.347.
3.22
Romoval ot ths powor tsko-ofi rducrion gser driv6 shaft (rracror Mod.7G)
FI
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:
REAR DIFFERENTIAL
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3-2313-24
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WHEEL HUBS
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SECTION V
WHEEL HUBS
OVERHAUL
(Tractor
l',4od. 75)
Preliminary operation
Place
it on
e. Using a hammer and a punch (see figure 32) push out the axle shaft and locking ring (1; fig. 3-531 which should have come off and fallen inside the hub. f. From the same side, extract the bearing and take off
the retaining
ring.
lr|
b. Take oft the brake drums. c. Remove the bolts (1 ; fig. 3-51 ), the shackle (2; fig. 3-51), and take off the brake shoes by moving the
lever (3; fig.3-51).
g. From the opposite side of the hub (see figure 3-54) take off in order: the oil seal, the retaining ring and
the bearing. REMOUNTING
tf F
DISMOUNTING
transmission housing and take of{ the wheel hubs after having removed the six bolts
necessary
ln order to remount the locking ring (1; fig.353) it is to heat it to a temperature of 180 to 2OO'C
FT
FI
(355 to 390'F) (blue color). Pur rhe locking ring over the axle shaft and let it tall in place {see figure 355). Using a hammer and a piece ol metal tube (see iigure 3-56) o'f the correct diameter, align the ring perfectly on the axle shaft, in contacl with the bearing. Let cool.
t
I
OVERHAUL
{Tractor Mod. 76)
Prliminary oporation
rtl
;l
Fif.351.
OISMOUNTING THE WHEEL HUBS lsolar the wheel hub that needs overhaul and remove the eight bolts which aftach the hub to the wheel reduction gear (see figure 3-57) and proceed with the
follqwing operations:
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a, Loosen and remove the nut (1; fig. 3-58). Take off the washer (2; fig. 3-58) and the seals (3; fig.958), b. Mount on the flange (1; fig.3-59), by means of five bolts (2; fig. 359), the proper pulling tool (3; fig.
359).
Note
The puller tool (3; fig. 3-59) lor the removal of the wheel hub flange (1; fig. $59), can only be obtained from FERRARI Company.
TI
3-25
:a
:J^l :
WHEEL HUAS
ATTACHING
BOLTS
WHEEL HUB
---JI
AXLE SHAFT
WHEEL RIM
PERFECTLY ALIGNEO
_l'I
ING
componnts
c. Turn the hexagonal head of rhe puller tool (4; fig. 359) in a clockwise direction and extract the flange (1; fig.3-59). Separate the flange from the puller
tool.
ot 2)
FT
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FE
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WHEEL
H
U85
hub
- For remounting
150 and 200'C (300 and 390'F). Place the flange on the shaft and seat it properly, Let cool.
gear
It
b. Take ofl the retaininq ring ('1; fig.3'61), located on the opposite side of the bearing, and take out the
reducrion gear snatt (2; f g. 3 61). REMOUNTING
Observe the normal rules, paying particular attention to
;l
the lollowing:
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Fig.
F I
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Fig. Fi9.
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2 ol 2l
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Fir.157.
-J\ \)
3-27
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WHEEL HUBS
Fig.
gsr
.h!ft
J
I
3-28
ft
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STEERING (m.ch.nlcal)
dr
fr
SECTION VI
STEERING (Mechanical)
OVE RHAU L
(Mechanical sleering, tractor N'4od 75)
FI
fi
Preliminaty operation
it #
,{
o.f the steering wheel and remove the steering wheel itself using a puller tool (see figure
b. Disconnecl all ot the electrical connections to the instrument panel paying particular attention to the dismounting of the horn, lights. and starter switches. c. Take out the central mounting bolt (1; fig. 3'8) and the six screws (2; fiq. 3'8) on the side of the
instrument panel. Remove the panel. DISMOUNTING OF THE STEEBING BOX
Fit. 3.63. Romovsl of th. rtxring .rm
F Ir
Ir!
d. After having removed the cotter pin, remove the castellated nut (1; fig. 3-67) from the steering arm
sha'f1.
By means of a pulling tool (1; fig. 3'63) take the arm {2; lig. 3-63) o'ff of the shatt (3; lig. 3'63) of the
steering box.
.from the steering remove the .flange and drain the oil
of the steering
ril
h. Take out the steering worm shaft (1; fig.3-65) being careful n01 to Jose the shlms (2;fig. 3-65)
+ rl
FI +.
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Fig.
,29
:l :t^l :
STEERING (m.chrnlcal)
i.
Take out the steering shatt and sector gear assembly (1; fiq.3-66) using a wooden mallet.
perfectly aligned, the number of turns of the steering wheel rotating to the right is equal to the number of turns of the steering wheel to the left.
j.
k.
By means of a punch and a hammer (1, 2;1i5.3-67) pry loose and take oJJ the cover (3; fig. 3'67) o{ the
articulating arms.
Remove the retaining ring {1; fjg. 3-68) and take ofi the arm {2; Iig. 3-68) using a puller tool as indicated.
Note
For the dismounting of the other arm (3; 368) follow the same procedure.
Jig
WARNING
After dismounting, take out the pivot pin (1; lig. 3-69) by us6 of a punch. lf the ball joint (2; fig. 369) has to be replaced, also replace the bushing (3; fig.3-69). After mounting the new
bushing, csulk Eround the ntiro cincumtorgnco
Fig.
347. R.mov.l
-1
always be
replaced and pressure mounted with appropriate caulkings to retain them in position.
REMOUNTING OF THE AFTICULATING ABMS No particular attention is required {or the remounting of the articulating arms.
38. R.movll ol
tha
articullline.rm
Fig.
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'
STEERI NG (m.chtnlc.l)
REMOUNTING OF THE STEERING BOX Remount the steering box in the inverse order to that indicated tgr dismounting. Pay particular attention to the mountinq ol the steering column in the box.
column (2; fig. 3-64), no vertical play exists at the shaft (l ; fig. 3-65).
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ra
After completing the mounting ot the steering shatt and sector gear (1; fig. 3-66), turn the screw (3; lig. 3-&) to tighten the flange against the box, to eliminate the axial play o{ the steering shaft and to
insure the best meshing between the sec\or gear and the steering worm gear.
- lf
the number of shims (2; fiS. 3-65) so thal, after linal installation of the steering
necessary increase
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3.3113.32
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:
HYDRAULIC SYSTEM
SECTION VII
HYDRAULIC SYSTEM
tl ti
ll
OVERHAUL
INTRODUCTION
FI
The hydraulic system o{ the tractor does not require any particular instructions tor dismounting of the compo'
nents to effect an overhaul. Generally, after having found the cause ot the lailure, it is suf{icient to clean the line, filter, etc.. and/or replace
the
hydraulic system o{ the tractor is complex, and when any doubt arises, it is suggested that the help o{ an
experl be requested or that the manu{acturing company
be contacled directlY.
r
* * *
Below are described the necessary operations to check the system, lo be sure it is in perlect working order, and tocalibratethevalves. Pay scrupulous attention to the
lollowing.
lhr
FI
read between 1 00 and 105 Atm, tighten or loosen the regulating screw (2, lig. 3-71) on the hydraulic valve (l;1,9 3-71) for the hydrairl:c steering.
F
* * *
a. lnstall, on the outlet fitting ot the hydraulic pump, a manometer with a scale of at least 250 Atm. {See
figure 3-70).
Note
For access to the regulating screw, remove the rubber insert l7: tig. 3-711 located on the
instrument panel.
Note
The flange of the hydraulic pump can be located in a different position, on the engine body, than that indicated in Jigure 3-70. The position may vary according to the engino
installed in the tractor.
c. lf the operating
ascertained
hydraLr
but the
having
steering movement
is still
irregular 8fter
tunctions
ly 2000
RPwI.
HYDRAULIC POWER. LIFT PRESSURE VALUES (Tractor Mod. 75 with mechanical steering)
a. Turn the steeflng wheel until the wheels are as {ar eit or righl as they can go (sleering gear jack cornpletely
extended or retracted).
a. Place rn lift posiiion the distributor control lever (1; lig. 3.721 ol the hydraulic power - lift and hold there while ascertaining that the manometer indicates a
pr essure
b. lf the
pressure
b. Check to see that the manometer shows a between 100 and 105 Atm. lf the pressure does not
pressure is not obtained, remove the protecting cap and lrqhlen or loosen the requlatinq screws of the
orD(,.r. F
IL
ll:t^l'
HYDRAULIC SYSTEM
Note
For more complete actess to the valve,
become necessarv
pa ne
it
to
remove
the .nstrJ-rp1l
l.
a. Place in "LlFT" position the distributor control levers (1, 5;fig.3-73) o{ the hydraulic power - lift. b. Push the lever (2; tig. 3-73) as far from vertical as it will go, as shown in the figure, and mainlain it in that position. Ascertain that the manometer indicates a
pressure between 80 and 100 Atm.
c. li this
clean,
pressure is not obtained, and after checking to be sure that there are no evident oil leakages from the distributor, disassemble the valve (3; fig. 3-73) and
WAR.NING
Do not touch the regulaling nut (4; fig,3-73) of the distributor. TH IS ADJUSTI\4ENT HAS BEEN SET BY THE MANUFACTURING CON,IPANY DURING THE MOUNTING OPERATION.
CH EC
KING BYPASS VALVE PRESSURE (Only for tractors with hydraulic steering)
a. Push the lever (2; fig. 3-73) as tar as it will go from vertical in the indicated direction and maintain it in
this position,
b. Turn the wheels completely to the right or left (steering jack completely extended or retracted), Check that the manometer indicates a pressure
between
1
c. It this
hydraulic system bypass valve and tighten or loosen the regulating screw with a screw driver. See ligurs 374 for tractor Mod. 75 and figure 3.75 for tractor Mod.76.
Fig.
372.
valve
Cslibrarion for th hydr.ulic powor lift prossrr ..liaf valv. (rraclor Mod. 75)
HT
il
'l'r^l:
HYDRAULIC SYSTEM
lh
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t
*
a.
Loosen the clamp on the return tube (1; iig. 3-76) of the hydraulic fluid and detach the tube. 3-76).
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* *
rl
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For
Fig.373. Ch.cking pr8uro of
Iurther
th., hydraulic power
figure 3-81.
Fig. 3-75.
C'librslion of lhs
bypass vslve
ltractor Mod.76)
+ rI
Fig.
r61urn
filtor canridge
3-35
:a
:J^t :
HYDRAULIC SYSTEM
-/i
-/, ,\ -./\
,-' ,\ ,,,
f
-/.'
...
a
,,:
1.
2. Oil tank 4. Distributor (control valve) lmp ement release valve 6. Pressure regulator valve 7. Power - lif t jack 8. Control lever
/N \ -/i ,/\
2,
.-/..-
,\
,>
,/) \ /\
l-
-/>
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HYDRAULIC SYSTEM
t rl + I
F
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ul
1--t\
_/\
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,\
./,
w H
)\ -r,/' \
/\
-/.
.,',
\ ,\
ll
* *
1. Hydraulic pump 2. Oil tsnk 3. Return filter 4. Bypass valve 5. Steering jack 6. Hydrsulic steering 7. Control l8vsr for r8ising snd
lowering th implsmsnt
a,\
-.\ -( -/ _/\ -/\
7\
v8lvs)
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1\
+ rI
Fig.
3.37l3.38
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HY
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FI
SECTION VII
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*
OVE
Preliminary oPtations
a. b.
HI
DISMOUNTING
F
* * * * *
c.
Flemove the two socket head screws from the two lifting arms of the power - litt (1; fig.3'79) and take off the two srms (2; fig. 3-79' d. Detsct th outlt connector (1; fig. 30) of the hydrrulic fluid 8nd take out the pivot pin locstod Et tho rsr of the i8ck. Take out the jack.
ri
HYORAULIC POWER.LIFT
(Tractor Mod. 75, mechanica steering)
F\
*
rl
Fig.
&80.
Romoval ol
th.
power -
lift
i6ck
339
:a
:J^t :
-HYDRAULIC
lf th hydraulic power - lift lunctions irregularly it may sometimes be caused by the quality oI the oil or the impurities contained in the oil. When changing or adding oil, it is recommended that scrupulous attention be given to cle.nliness and prescribed handling as indicated by the manufdturer.
TBOUBLES AND REMEDIES
TBOUBLE
The implemenr does nor lif r or
lifts
l.
wilh
ditliculty
2. lnsutficienl pressure. After removing the protectiv -ap, tighten the regulating screw of the pressure relief valve of the distr,- itor to increase
the pressure.
3. Oil 4. Oil
Damaqed hvdraulic
ote
it
proper pressure. See the paragraph "HYDRAULIC POWER LIFT PRESSURE VALUES" for the respec'tive tractor
involved.
Replace
Slowimplement
liftingspeed.
1.
2. Air infiltration in the suction tube of the pump. Replace the tube snd,
after having carefully tightened the clamp, ascertain that the lifl
reestablished to proper working conditions.
has been
3.
The implement lift works
the pump.
unevenly.
1. lnsufficienthydraulictluidinthetank.Restorefluidtoproperlevel, 2. Clogging of the suction tube caused by the failure of the return lilter
cartridge. See paragraph "REPLACEMENT OF THE RETURN HYDRAU.
3.
Oil leakage lrom the power -
litt.
2.
oil
340
:l:J^l:
HYDRAULIC POWER. LIFT
HYDRAULIC POWER-LIFT
Refer to figure 3-81.
TROUALE
The
lift
a load.
1. Lack ol oil. Restore the oil level. 2. Jamming pilot valve (14; fig.3-81) caused by impurities contained in the oil. Unscrew the four screws holding the cover (26) then unblock and clean the valve. To prevent the repetition o{ this problem. carefully clean the return orl lilter canridge (tigure 3-i61.
1. Jamming ol the shaft {3). Dismount the cover (22); place the control lever
in down posit'on. Unblocl the shafr with light blows.
The power
The
power raising,
lift
pumps during
1.
2.
lnfiltration of air into the suclion line. Check the connectors for proper rightening and replace the packings. Bleed the tube by squeezing.
,.r
The hydrsulic power - lift does not .om8in in position but rilss or talls with jerking lction or with tho snqin off the powgr . lift groeps down.
dtaw^ through the oil seal oJ the pump. Replace the oil seal of the
pump
1. Leaking chock valvs (16). Take off the cover 126), extract the vslv6
End
clogn the valvs ssst. lf th6 vslv6 and vslv6 tsat rs in good conditign and thls troubl6 16p6att, chsnge or filter ths oll snd clan the crrtridg.
il
2. Oii sepsge through the piston sssl or through the cylindor cap seals, or through th6 leals bstwson ths body of ih8 distributor block snd the housing. ReplEc6 ths rsspoctivs oil lal.
1. Tho pump f8ils to devslop lull output. Ovsrhsul or rplsce tho pump,
Th hydraulic power . lilt dos not hevs sufficiont lifting powor. U3u8lly this trouble is sccompainod by sbnorm6l hating of th9 sy5tsm,
2. lmpropsr rttlng of the rrlief valvo (9. l0), Take off ths covsr (26) snd
reploc6 th spring (8).
3.
Damage to tho valv plunger (9) 8nd its Replace the valve.
se
When the arms of the hydraulic power - lift are in full "up" position, the reliel valve cuts-in.
1. Jammed poppet (3), Djsmount the cover 122l,, place the control lever in down position and free the poppet by tapping lightly.
2, lmproper setting of the raise limit "stop". Temporarily, so as to prevent damage to the system, tighten the wing screw (located at the upper part of
the control quadrant) so that the travel does not pass the point where the relie{ valve cuts'in. However, have this travel ,,stop,, adjusted by the manu{acturer or the local representative as soon as possible.
3-41
:J:r^t:
HYDRAULIC FOWER. LIFT
I
TROUBLE
oil through the
1. Oil level too high or too low. Restore the oil to its proper level,
2. Air drawn into the suction line. Tighten the fittings; inspect the welds;
replace the gaskets.
seal
seal.
il'o
rs-@
,t+
'o*
30
@
'
t';:
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Fig.
381.
Power -
76
3-42
t___