SErVIcE MAnuAL

MODEL 55T FInAL DrIVE

WArnInG: While working on this equipment, use safe lifting procedures,

! wear adequate clothing and wear hearing, eye and respiratory protection.

THIS SErVIcE MAnuAL IS EFFEcTIVE: nOTE: Individual customer specifications (spindle

S/n: 857 TO currEnT mounting, sprocket pilot, brake assembly, etc.) may
DATE: 6-1-09 TO currEnT vary from exploded drawing and standard part num-
bers shown. If applicable, refer to customer drawing
VErSIOn: SM 55T-AA
for details.
 Lubrication & Maintenance
Gearbox nominal operating temperatures are between 122oF and 158oF. Use the chart below to determine the appropriate lubricant
viscosity for your application by choosing the highest foreseen temperature and rpm. If the gearbox is operating outside of these tem-
peratures contact Eskridge. In applications with very low output speeds and heavy loading always choose high viscosity oils. Heavy use
applications with high continuous loading and temperatures require a plyalphaolefin synthetic lubricant. Use only EP (extreme pressure)
or API GL-5 designated lubricants. Change the lubricant after the first 50 hours of operation and at 500 hour intervals thereafter. The gear
drive should be partially disassembled to inspect gears and bearings at 1000 hour intervals.

Temperature
Output RPM (n) 50ºC (122ºF) 70ºC (158ºF)
n<5 ISO 320 ISO 460
5<n<20 ISO 220 ISO 320
n>20 ISO 150 ISO 220

Operating Position Oil Capacity Oil Level

Fill level

6 quarts / 5.5 liters

Drain plug
orientation

ESKRIDGE SERIAL TAG AND PART NUMBER INTERPRETATION

Note: All standard Eskridge Geardrives are issued a descriptive part number which includes information regarding
the Model, spindle style, hub mount, input spline configuration, service brake specifications, overall ratio and vari-
ous available options. The serial tag , located on the cover, provides all necessary product information to identify
the final drives components. For a detailed breakdown of this information, please refer to Eskridge product speci-
fication sheets found at: http://www.eskridgeinc.com/geardrives/gearprodspecs.html

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 Cover and Planetary Gearing
5

11
25B 7
8
9

16C 16B
10
6 3

2B

25A
20C
30A
Cover and Planetary Gearing Disassembly and Reassembly
Inspection 1) Install O-ring (16C) onto bearing carrier assembly.
1) Disconnect brake release line from spindle. Remove hex head 2) Place tertiary planet assembly (5) onto spindle splines.
cap screws retaining motor to spindle then remove motor. Take
out fasteners retaining sprocket to ring gear flange. Orient 3) Install tertiary sun gear (8) and shaft coupler (11).
one cover (3) drain plug (30A) in the downward position and
4) Place a thin film of oil onto the ring gear (2B) cover and
remove both plugs from unit. The oil will drain out more quickly
bearing carrier pilots. Place ring gear over tertiary planet
and completely if warm. Remove fasteners retaining final drive
gear set and align the tertiary planet gears with the ring
to chassis.
gear teeth. Align ring gear retention fasteners (25B) holes
2) Remove the nine, M10 X 1.25 SHCS (25A) securing the cover located in the bearing carrier with the threaded holes in
(3) to the ring gear (2B). Inspect cover O-ring (16B) and thrust the ring gear. Slide ring gear over the bearing carrier pilot
washer (20C) replace if necessary and O-ring (16C). Install fasteners (25B) with blue thread
retention compound and torque to 20 ft-lbs.
3) Remove sun shaft (10) then take out primary carrier assembly
(9). 5) Align secondary carrier assemblies (7) planet gears with
the ring gear and install secondary carrier. Install the sec-
5) Remove secondary sun gear (8) and lift out secondary carrier ondary sun gear (8) and rotate the carrier until the carrier
assembly (7). spline couples with the tertiary sun gear (6).
7) Remove two M8 X 1.25 SHCS (25B) retaining ring gear to 6) Install the primary carrier assembly (9) on the second-
bearing carrier. Install two M10 X 1.5 eyebolts into ring/cover ary carrier sun gear (8). Install the sun shaft (10) into the
mounting location and remove ring gear (2B). Inspect bearing shaft coupler (11) and primary gear assembly (9).
carrier O-ring (16C) and replace if necessary.
7) Install cover (3) pilot into the ring pilot (2B) then rotate
8) Remove shaft coupler (11) and tertiary sun gear (6) and take off the cover until the primary gear teeth (9) mesh with the
tertiary carrier assembly (5). cover gear teeth. Align the cover though holes with the
10) Clean and inspect components, identify any individual compo- ring gear threaded holes. Place blue thread retention
nents that require repair. Rotate planet gears to ensure planet compound onto the fasteners (25A). Install the fasteners
bearings roll freely and smoothly, replace if necessary. A bill and torque them in a crisscross pattern to 37 ft-lbs.
of materials identifying individual components and their subse- 8) Place both plug holes in a horizontal position at approxi-
quent part numbers is provided at the end of this manual mately 2 and 9 o’clock then fill the unit with oil. Install oil
fill plugs (30A).

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 Spindle and Bearing Carrier

20A 2A
1

20B 35C
35D

16A

35A

Bearing Carrier and Spindle Disassembly and

Inspection
1) Remove spindle lock ring (35D) using a heel bar or puller.
Don’t pry against taper roller bearing cage (20B) when remov-
ing the lock ring .
New Seal
2) Remove split ring segments (35C), and shims (35A).
Caution: Since spindle is no longer retained, care should be
taken to avoid personal injury. Care should also be taken not to
damage spindle when it is pressed through bearing carrier.
3) Remove bearing carrier (2A) from spindle (1) by applying a
load to the internal end of the spindle until it passes through the Partially Worn Seal
internal bearing (20B).
4) Use a gear puller to remove the outer bearing cone (20A) from
Reassembly
the spindle (2). If reusing the bearing cone do not pull on or 1) Place spindle (1) on table with splined side up. Press
damage the bearing cage. outer bearing cone (20A) onto spindle by pressing on
bearing cones inner race.
5) Clean and inspect inner and outer bearing cups and cones
(20A, 20B). If cups are damaged they must be replaced, drive 2) Apply a thin layer of lithium or general purpose bearing
them out using a brass hammer and drift utilizing the bearing grease to the roller contact surfaces on the bearing cups.
knock-out notches in the bearing carrier. If a bearing cup or
cone is damaged replaced both components. 3a) Wipe the face of each half of the metal face seal (16A)
using a lint-free wipe. No particles of any kind are permis-
6) The metal face seal (16A) is design to automatically compen- sible on the sealing surfaces. (Even a hair is sufficient to
sate for wear. The sealing band of a new seal is located at hold the seal surfaces apart and cause a leak.) Apply a
the outer perimeter of the seal surface. As seal wear occurs thin film of oil on the entire seal face of one or both seals
this contact band will widen and migrate towards the center using a clean finger or lint-free applicator. Oil must not
of the seal. By measuring the distance from the contact band contact any surfaces other than the sealing faces. (If its
to the inner diameter an estimate of seal life remaining can be necessary to replace metal face seal follow steps 3b-3d If
obtained. If the distance between the contact band and seal not move onto step 4.)
surface internal diameter is less than 50% if the overall sealing
3b) The seal cavities that retain the metal face seal must be
surface width, replace seal. Below is an illustration showing the
free from foreign material (oil, grease, dirt, metal chips
sealing band location for a new and partially worn seal.
dust or lint particles, etc.) before installing the seal. Clean
surfaces with a lint-free wipe and a non-petroleum based
solvent.
3c) Install the seal using special installation tool shown in fig-
ure below. Mount the installation tool onto the metal seal
ring. Lightly dampen the lower half of the rubber torric with
one of the appropriate assembly lubricants outlined be-
low.
Model 55T Final Drive service manual, SM 55T-AA Page 
Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 Spindle and Bearing Carrier

Installation Tool

Rubber
Torric Metal Seal Ring

Approved Assembly Lubricants*

Isopropyl Alcohol
Houghto-Grind 60 CT
Quaker® Solvo Clean 68-RAH
*Do not use Stanosol or any other liquid that leaves an oil film
or does not evaporate quickly.
3d) Push seal into housing using even pressure. When the seal
is properly seated you will feel it snap into place. Verify the
metal face seals sealing surface is parallel to the spindle or
bearing carrier housing and the torric O-ring is not budging
out.
4) Install bearing carrier (2A) onto spindle assembly. Place bear-
ing cone onto spindle assembly. Press on the inner race of
bearing cone (20B) using light pressure until the bearing is
seated in the bearing cup.
5) Install shims (35A) and Load-N-Lock™ halves (35C) over
shims into the corresponding spindle groove. Then, install the
lock ring (35D) over the segments (35C). Proper spindle bear-
ing preload will result in a rolling torque which varies between
130-170 in-lb. Add or remove shims to obtain the proper
preload.
6) The bearing carrier and spindle subassembly service or repair
is complete at this time continue unit assembly

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 Service Brake

82

83

4
87 81
88
84A
84B
85
84D 84C
86

Service Brake Disassembly and Inspection plate (83). Continue to install friction disks (82) then
separator plates (83) until the complete friction pack
is installed. There must always be a friction disc (82)
1) This final drive is equipped with a spring applied, hydraulic above and below each separator plate (83) Some units
release, multiple disc service brake incorporated into the will have a spacer (Not Shown). If the friction pack was
spindle. In order to disassemble the brake a light load needs provided with a spacer install the spacer between the
to be placed onto the backing plate (87). Apply only enough last friction disk (82) and the piston (85). Be careful not
force on the backing plate (87) to release the load the back- to contaminate the friction surfaces with dirt, grease or
ing plate is applying to the retaining ring (88). Remove the fluid media other than what is specified for your par-
retaining ring. ticular gearbox.
2) Remove backing plate (87) input shaft (4) and springs (86). 2) Lubricate O-rings and bores with silicone based lube
3) Apply low pressure air (20-30 PSIG) to the brake release or with mineral base oil. Gently slide Piston (85) into
port while holding one hand on top of the piston (85). The spindle. Press down firmly on piston until the piston
air will force the piston out of the spindle. Inspect piston O- (85) is firmly seated against the friction pack. Do not
rings (84A, 84B, 84C, 84D) for signs of abrasion, extrusion use a hammer or mallet to install piston.
or other damage and replace if necessary. If replacing piston 5) Insert springs (86) into piston (85) evenly or symmet-
O-rings, be sure O-rings (84B & 84C) are nearest each other rically spaced.
with backup rings (84A & 84D) to the outside. The flat side of
back-up-ring must be placed next to piston groove wall, with 6) Install shaft (4), it may be necessary to rotate shaft in
the curved side contacting the O-ring. order to align the separator plate splines with the shaft
splines.
4) Friction disks (82), separator plates (83) and thrust washer
(81) can be removed. Note the arrangement of the friction 7) Install backing plate (87) then place load onto backing
disks and separator plates. Some final drives will also have a plate and install retaining ring (88).
spacer (not shown) and its position also needs recorded.
5) Friction disks (82) should be replaced when overall stack
height of the friction pack [ spacers (not shown), friction disks
(82) and separator plates (83)] is less than 1.52 in. If the fric-
tion disks are replaced soak the new friction disks in gear box
oil prior to installation.
6) Clean and inspect the piston (85) bores for scratches or abra-
sions and replace if necessary.
Reassembly
1) Install thrust washer (81), friction disk (82) then separator

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 Disconnect Cover Assembly

16B 16D
40A

16E
3
40B
40C

25E
25C
30A 25D
25A
20C

Standard Cover Assembly

cover bill of Materials

Item # QTY Description Part Number
71T Cover With Disconnect 55T-004-2002
73T Cover With Disconnect 55T-004-2008
3 1
71T Cover W/O Disconnect 55T-004-2001
73T Cover W/O Disconnect 55T-004-2003
16B 1 O-ring 01-402-0020
16D 1 O-ring 01-402-1003
16E 1 O-ring 01-402-1002
20C 1 Thrustwasher 01-112-0511
25A 9 SHCS M10 X 1.5 X 30MM Class 10.9 01-150-2054
25C 4 SHCS M6 X 1 X 30MM Class 10.9 01-150-2050
25D 2 SHCS M8 X 1.25 X 30MM Class 10.9 01-150-2049
25E 2 SHCS M6 X 1 X 50MM Class 10.9 01-150-2048
30A 2 Hollow Hex Plug 01-208-0060
40A 1 Disconnect Housing 55T-004-1021
40B 1 Disconnect Plug 55T-004-1023
40C 1 Disconnect Plunger 55T-004-1022

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 Bearing Carrier Assembly

16C
5

25B

6
2B
11

7
8

9
10

Gear T rain bill of M aterials

Item # QTY Description Part Number
2B 1 Ring Gear 55T-004-1035
5 1 Carrier Assembly - Tertiary (4.5:1) 55T-004-0103
6 1 Sun - Tertiary 55T-004-1008
Carrier Assembly - Secondary (4.46:1) 55T-005-0105
7 1
Carrier Assembly - Secondary (6.29:1) 55T-005-0102
Sun - Secondary (4.38:1) 55T-004-1029
8 1
Sun - Secondary (6.29:1) 55T-004-1009
Carrier Assembly - Primary (4.38:1) 55T-005-0104
9 1
Carrier Assembly - Primary (5.64:1) 55T-005-0101
Sun Shaft - Primary (4.38:1) 55T-004-1030
10 1
Sun Shaft - Primary (5.64:1) 55T-004-1010
11 1 Shaft Coupler 55T-004-1020
16C 1 O-ring 01-402-0950
25B 2 SHCS M8 X 1.25 X 30mm C10.9 01-150-2049

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 1
16A

20A
2A

20B
35A

35C

35D

bearing carrier bill of Materials

Item # QTY Description Part Number
Spindle, 160mm Pilot for Cartridge Motors 40cc - 60cc 55T-004-4003
1 1 Spindle, 190mm Pilot for Cartridge Motors 75cc - 90cc 55T-004-4001
Spindle, 200mm Pilot for Cartridge Motors 107cc - 125cc 55T-004-4007
2A 1 Bearing Carrier, Pilot 350mm, BC 400mm, 20 X M20 X 1.5 55T-004-3001
16A 1 Metal Face Seal 01-406-0010
20A 1 Tapered Roller Bearing 01-103-0313
20B 1 Tapered Roller Bearing 01-103-0311
35A * Shim (* Bearing Load Determines Quantity) 55T-004-1011
35C 1 Split Ring - Load-N-Lock 55T-004-1015
35D 1 Lock Ring - Load-N-Lock 55T-004-1016

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com
 88
4

SPRING PACK
QUANTITY VARIES WITH
GEAR BOX RATIO
85
87

86 83
82
81
84D
84C
84B
84A FRICTION PACK
QUANTITY VARIES WITH
GEAR BOX RATIO

brake Assembly bill of Materials

Item # QTY Description Part Number
Brake Shaft, Input 16T DIN 5480-1 55T-004-1033
4 1 Brake Shaft, Input 18T DIN 5480-2 55T-004-1019
Brake Shaft, Input 21T DIN 5480-3 55T-004-1024
81 1 Thrust Washer 01-112-0230
82 * Stator (*Brake Holding Torque Determines Quantity) 90-004-1742
83 * Rotor (*Brake Holding Torque Determines Quantity) 01-288-0020
84A 1 O-ring 01-400-1006
84B 1 Back Up Ring 01-402-0262
84C 1 O-ring 01-402-1007
84D 1 Back Up Ring 01-400-0263
85 1 Piston 55T-004-1034
86 * Spring (*Brake Holding Torque Determines Quantity) 01-261-0290
87 1 Backing Plate 55T-004-1018
88 1 Internal Retaining Ring 01-160-0811

Model 55T Final Drive service manual, SM 55T-AA Page 

Eskridge, Inc. Olathe, KS. 913-782-1238 www.eskridgeinc.com