1125-003-07Y Cap 7 Mantenimiento Grua QY70V 532
1125-003-07Y Cap 7 Mantenimiento Grua QY70V 532
1125-003-07Y Cap 7 Mantenimiento Grua QY70V 532
1125-003-07Y
7.1 Lubrication
7.1.1 Hydraulic Oil
The hydraulic oil tank is filled up with hydraulic oil before delivering the crane and its brand is
L-HV32.
CAUTION: This product is fully hydraulic driven. The quality, viscosity and
cleanness of hydraulic oil are the most key factors for the crane. Ignorance to change
hydraulic oil will cause various faults and shorten the service life of the crane greatly.
Our company will not take any responsibilities for the consequences caused by not
complying with the requests stipulated in this manual during oil change and filtering.
7.1.1.1 Interval Table of the Hydraulic Oil Filtering or Changing
CAUTION:
a. Filter or change the hydraulic oil immediately once it is polluted seriously.
b. Choose proper hydraulic oil according to the ambient temperature.
c. The hydraulic oil of different brands cannot be mixed.
d. Service time of hydraulic oil is not more than 24 months, and it cannot be used any
more after 24 months even if it has been filtered.
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Liquid
temperature
meter
Use the gear oil brand recommended in this manual. The product is full with SY1172-80 90#
industrial gear oil before delivery. Its performance and parameters are as follows:
Kinematic viscosity (100℃) Flash point
Ingredients
mm²/s (split), ℃
The organic acid fat, phosphoric acid
fat, the silicic acid fat, the fluorin oil, the
13.5~<24.0 More than 165
silicon oil, polyphenylene oxide + the
addictive
7.1.2.1 Interval Table of Oil Change
Delivery Every 200 hours Change oil Every 12 months Change oil
date
CAUTION:
a. Once the gear oil is polluted seriously, change it even if it has not reached the oil
change intervals.
b. Often check oil level and add oil in time when it is lower than the required value.
c. Hydraulic oil of different brands cannot be mixed.
d. Use the recommended gear oil according to ambient temperature. The reducer
mechanism will be damaged due to unqualified or improper viscosity gear oil.
7.1.2.2 Parts Needed Oil Change/
1) Winch reducer
il level.
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(1/10mm) than
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1 ● Lubricating graph
2 16 15 14 13
1
3
4 12
5
6
7
8
11
9 2
10
7—7
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12
3 10
4 5 6 7 8 9
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CAUTION:
a.Clean the oil cup and the surface waiting for greasing before oil filling.
b.Fill the lubricating grease to the sliding surfaces which are not listed in the above
table.
c. The lubricating grease of different brands cannot be mixed.
d. When inject grease to the bush, shaft and bearing, do not stop injecting until the
original grease flows out.
e. If the piston rod of derricking cylinder is partly exposed when the boom is secured
on the boom bracket, grease the exposed section every month.
7.1.5 Engine Oil
Refer to Operating Manual for Engine.
Drum Pipeline
1. Check it for crack; 1. Check joints for tight fit;
2. Check if the wire rope on 2. Check it for leaks;
the drum winds out of 3. Check pipe clamp for tight
order. fit and crack;
Hook and pulley 4. Check hose for aging,
1. Check if hook rotates deformation and damage.
easily;
2. Check it for The control lever and the pedal
deformation; Crane’s
1. Check if they work
operation
3. Check it sways flexibly; properly.
system
2. Check they for clearance.
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of gearbox, steering gear, reducer of hoisting mechanism and slewing mechanism according to
requirements. Dismantle and clean the cooling system. Rectify the proportion of carburetor and
battery’s electrolyte.
7.3 Rectify, Clean and Change the Parts
7.3.1 Change the Wire Rope
CAUTION: The wire rope will wear gradually, and it will be very dangerous, if neglect
its wearing condition and continue using it.
7.3.1.1 Take-down Criteria
1) There is 10% broken wire rope in one strand (wire core excluded).
2) The diameter is reduced by more than 7% of its nominal diameter.
3) The wire rope is reverse bent or knot.
4) The wire rope is seriously deformed; Wire core is revealed, birdcage deformed and in
corrosion.
CAUTION: The wire ropes must be taken down before they reach the above stage.
5) The wire rope is strained and damaged when it comes out from the pulley.
6) The wire rope is damaged by heavy objects.
7) The wire rope is damaged by electric welding or gas welding.
8) The wire rope is short-circuit damaged.
9) The wire rope is heat damaged.
CAUTION: The wire ropes can be taken down before they reach the above stage
according to the wearing conditions.
7.3.1.2 Change the Hoisting Wire Rope
1) Changing the operating conditions
(1) Lay the crane on the solid and flat ground.
(2) Telescope in the boom completely.
2) Changing steps
(1) Lower the main hook on the ground.
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Tool: Wrench.
Keep the parts orderly and do not lose them.
(3) Take down the wire rope from the bail.
CAUTION: When change the wire rope on main winch, the lowering limiter will cut
off the lowering motion of the hook when there are 3 turns are left. At this time, press
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CAUTION: The wire rope’s end should be tightened with iron wire or ethylene
plastic belt.
(7) Fix the one end of the wire rope on the main drum.
CAUTION:
a. Mount the chock correctly.
b. The end of wire should not come out from the outside circle of the drum.
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CAUTION:
a. Do not let wire rope disorder on the drum.
b. The wire rope’s end should be tightened with iron wire or ethylene plastic belt.
(9) Reeve the wire rope into the fifth boom section pulley and hook pulley according to the
corresponding wire rope falls.
Pay attention to the reeving sequence and do not reeve the wire rope incorrectly.
(10) Mount the bail and wire clamp on the wire rope.
CAUTION: Set the wire rope’s end on the side of the bail with bevel.
(11) Mount the bail on boom top section or hook according to wire rope falls.
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Tool: Wrench.
(12) Raise the boom to a large elevation angle and extend it, then lower the hook until the wire
rope on the drum is released to last three turns.
CAUTION: Do not lower the hook excessively otherwise the wire rope will be
damaged or an accident will occur.
(13) When lift a load which is 30% of the max. permitted lifting capacity of single rope, wind
the wire rope on the drum.
Weight of the load: W=0.3NP.
CAUTION:
a. Never exceed the rated total lifting capacity.
b. Max. permitted lifting capacity of single hoisting rope is 6000kg.
(14) Unload the load from the main hook.
7.3.2 Change the Hook
The hook should be discarded when one of the following instances happens (welding of hook’s
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Every 6 months
Caution: Hydraulic pump must stop working when replacing the filter element.
The operating steps are as follows:
1) Remove the top cover by wrench.
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Spring
Spring
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Boom top
section
7.3.4.2 Rectify Retracting Wire Rope for the 4th Boom Section
1) Extend the 3rd, 4th and 5th boom sections a little to reveal head of retracting wire rope in the
two sides in front of the 4th boom section.
2) Unscrew the locking nut and then screw down the adjusting nut (the nut is symmetric) until
the extending wire rope is just tightened.
Adjusting nut
Locking nut
CAUTION:
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If the distance between outriggers can not reach the entire-extending state (7.6m) after
horizontal cylinder of the outrigger beam being fully extended, which may be resulted from
that extending wire rope of outrigger beam hasn’t been properly rectified. Rectify the wire rope
according to the following steps:
1) Make the crane in driving-state (with the outriggers retracted).
2) Unscrew the locking nut and then screw down the adjusting nut until the extending wire
rope is just tightened.
Tool used: wrench.
CAUTION: Do not screw down the adjusting nut excessively otherwise the wire rope
will be in over-tight state. Screw down the locking nut again after adjustment.
7.3.5.2 Rectify the Retracting Wire Rope
If the 2nd outrigger beam can not be retracted fully after the horizontal cylinder of outrigger
beam being fully retracted, which may be resulted from that retracting wire rope of outrigger
beam hasn’t been properly rectified.
Rectify the wire rope according to the following steps:
1) Make the crane’s outriggers fully extended on solid and flat ground.
2) Unscrew the locking nut and then screw down the adjusting nut until the retracting wire rope
is just tightened.
Tool used: wrench.
CAUTION: Do not screw down the adjusting nut excessively otherwise the wire rope
will be in over-tight state. Screw down the locking nut again after adjustment.
CAUTION:
1) Do not rotate the wire rope when the nut is being screwed down.
2) The wire rope will wear gradually, and it will be very dangerous, if neglect its
wearing condition and continue using it. According to safety rules for vehicles, such
as crane, etc,, the following items are stipulated:
1) There is 10% broken wire rope in one strand (wire core excluded).
2) The diameter is reduced by more than 7% of its nominal diameter.
3) The wire rope is reverse bent or knot.
4) The wire rope is seriously deformed; Wire core is revealed, birdcage deformed and in
corrosion.
CAUTION: The wire ropes must be taken down before they reach the above stage.
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5) The wire rope is strained and damaged when it comes out from the pulley.
6) The wire rope is damaged by heavy objects.
7) The wire rope is damaged by electric welding or gas welding.
8) The wire rope is short-circuit damaged.
9) The wire rope is heat damaged.
CAUTION: The wire ropes can be taken down before they reach the above stage
according to the wearing conditions.
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