PDF Service Manual New Holland W50TC W60TC W70TC W80TC Wheel Loader - 3 MB
This service manual provides comprehensive repair and maintenance information for the New Holland W50TC, W60TC, W70TC, and W80TC compact wheel loaders.
It includes step-by-step instructions, diagrams, and specifications for all major systems.
It is the definitive guide for technicians servicing this series of loaders.
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--- Page 1 ---
COMPACT WHEEL LOADER
W50TC
W60TC
W70TC
W80TC
REPAIR
MANUAL
87630261 NA
Replaces 87618246 NA
Issued 02-2007
Revised 03-2007
www.newhollandconstruction.com
--- Page 4 ---
10 SECTION 00 - INTRODUCTION
1.11 WASTE DISPOSAL
Improperly disposing of waste can threaten the envi-
ronment.
Each country has its own Regulations on this sub-
ject. It is therefore advisable to prepare suitable con-
tainers to collect and store momentarily all solid and
fluid materials that must not be scattered in the envi-
ronment to avoid pollution.
At preset intervals these products will be delivered to
disposal stations legally recognized and present in
this Country.
Hereunder are listed some products of the machine
requiring disposal:
Z lube oil;
Z brakes system oil;
Z coolant mixture, condensation rests and pure anti-
freeze;
Z diesel oil;
Z oil and diesel oil filter elements;
Z engine and air conditioning air filter elements;
Z battery.
Also polluting rags, paper, sawdust and gloves must
be disposed in compliance with the same proce-
dures.
Do not use food or beverage containers that may
mislead someone into drinking from them. Do not
pour waste onto the ground, down a drain, or into
any water sources. Air conditioning coolants escap-
ing into the air can damage the Earth’s atmosphere.
Government regulations may require a certified air
conditioning service centre to recover and recycle
used air conditioning coolants. Obtain information on
the proper way to recycle or dispose of waste from
your local environmental or recycling centre, or from
your Dealer.
--- Page 5 ---
20 SECTION 00 - INTRODUCTION
HYDRAULIC MOTOR
W50TC W60TC W70TC W80TC
A6VM107HA1U1
Type A6VM80HA1U1 / 63W
/ 63W
cm3 80 / 18.8 80 / 23.7 80 / 24.8 107 / 31.5
Displacement Qmax / Qmin
(in3) (4.88 / 1.15) (4.88 / 1.44) (4.88 / 1.51) (6.53 / 1.92)
Maximum service
rpm 4362 5289 5292 4811
revolutions
Delivery pressure bar (psi) 25 (362) 25 (362) 25 (362) 25 (362)
Service pressure bar (psi) 245 (3552) 190 (2755) 185 (2682) 200 (2900)
Pressure increasing spring bar (psi) 20 (290) 10 (145) 10 (145) 10 (145)
Voltage V 12
2.8 ELECTRICAL SYSTEM
Service voltage.............................................................................................................................................12 V
Battery:
Capacity (20 h)...........................................................................................................................................92 Ah
Critical current ............................................................................................................................................900 A
Alternator ....................................................................................................................................................55 A
2.9 BUCKETS
W50TC W60TC W70TC W80TC
m3 0.65 0.70 0.80 0.80 0.90 0.90 1.00 1.00 1.10 1.20
SAE capacity
(ft3) (23) (24.7) (28.2) (28.2) (31.8) (31.8) (35.3) (35.3) (38.8) (42.4)
mm 1800 1900 1900 2050 2050 2050 2100 2100 2100 2100
Width
(ft) (5.9) (6.2) (6.2) (6.7) (6.7) (6.7) (6.900) (6.9) (6.9) (6.9)
kg 250 265 295 315 335 335 365 365 370 410
Weight
(lb) (551) (584) (650) (694) (738) (738) (805) (805) (816) (904)
--- Page 6 ---
4 SECTION 10 - ENGINE
2.2 FUEL
Use commercially available diesel fuel with less than
0.5% sulphur content. If the sulphur content is high-
er, oil change intervals should be reduced. The fol-
lowing fuel specifications / standards are approved:
Z DIN EN 590
Z BS 2869
Z ASTM D 975-96; 1-D and 2-D
Z NATO Code F-54 / F-34 / F-44 and XF 63
Exhaust emission values which may be determined
in the case of type approval tests always refer to the
fuels prescribed by the authorities for the type ap-
proval test.
WINTER-GRADE FUEL
Waxing may occur at low temperatures, clogging the
fuel system and reducing engine efficiency.
If the ambient temperature is less than 0 °C (32 °F)
use winter-grade fuel, suitable down to -15 °C (5 °F)
should be used; this fuel is available at the filling sta-
tions well in advance of the cold season. Diesel fuel
containing additives (Super diesel) is often available,
for use down to -20 °C (-4 °F) approximately.
Z At temperatures below -15 °C or -20 °C (5 °F or
-4° F), add petroleum to diesel fuel. The rele-
vant percentages are given in the adjacent dia-
gram.
If summer-grade diesel fuel must be used at temper-
atures below 0 °C (32 °F), up to 60% petroleum can
be added (see diagram).
In most cases, adequate resistance to cold can also
be obtained by adding a fluidizing additive for winter
operation.
Legend:
I Summer-grade diesel fuel
II Winter-grade diesel fuel
A Outer temperature
B Percentage of petroleum
SCAUTION
Diesel fuels must never be mixed with gasoline (Nor-
mal and Super grades).
--- Page 7 ---
8 SECTION 25 - FRONT AXLES
5. DISASSEMBLY AND ASSEMBLY
5.1 BRAKE DISC ASSY
DISASSEMBLY
Some of the following pictures could not show exact-
ly the axle, but the procedure is the same.
Remove the breather (1). Loosen the screw (14).
Remove the connector (13) and the breather pipe
(3) from the brake caliper (5).
--- Page 8 ---
18 SECTION 25 - FRONT AXLES
Fit a puller hooking it to the groove of parking brake
protection.
To compress the cover and the spring use pusher
380002234 (a1).
Screw in puller screw (a2).
Remove the camshaft (2).
Remove puller and pusher.
Remove the pusher (3).
Unscrew the tie-rod (4).
--- Page 9 ---
28 SECTION 25 - FRONT AXLES
Unscrew and remove the both fastening screws (3)
of the planetary gears carrier (1).
Remove the planetary gears carrier (1) from the
wheel hub and remove the relevant O-ring (4).
Position the planetary gears carrier (1) on a work-
bench and check its wear conditions.
To carry out any possible replacement of the gears
(7):
Z remove the snap rings (10) on every pin (5);
Z remove the thrust washers (9);
Z take out the gears (7) from the pins (5);
Z collect the needle bearings (6) and (8) checking
their condition.
--- Page 10 ---
38 SECTION 25 - FRONT AXLES
Apply the prescribed sealant on the stud bolt
threads (10) and tighten them to the prescribed
torque of 70 Nm (51 lbf·ft) using two nuts (nut and
lock nut).
Position the wheel hub (6) on a workbench and
force the two bearing cups (7) and (9) in position
with a driver 380002222 with a press or with a ham-
mer.
Assemble the seal ring (8) into the wheel shaft (6)
with the driver 380002227 and a hammer.
Insert the wheel hub (6) on the wheel shaft.
Heat the bearing (7) to 80 ÷ 100 °C (176 ÷ 212 °F).
Assemble the bearing.
SWARNING
Wear safety gloves.
Position the wheel carrier assy (2) on a workbench
and assemble bushings (4) at surface level with the
driver 380002223.
At least two bushings (diametrically-opposed)
should be set slightly higher than the carrier surface
level to be used as dowel pins.
--- Page 11 ---
48 SECTION 25 - FRONT AXLES
Slide out the long half shaft (17) from the axle beam.
Remove the splined sleeve (15). Remove the snap
ring (16) from splined sleeve inner, if replacement is
required.
ASSEMBLY
Some of the following pictures could not show exact-
ly the axle, but the procedure is the same.
Assemble bush (5) on the wheel shaft with the driver
380002229 and a hammer.
Overturn the wheel shaft.
Assemble the seal ring (6) in the wheel shaft with
the driver 380002221 and a hammer.
--- Page 12 ---
58 SECTION 25 - FRONT AXLES
5.9 DIFFERENTIAL SUPPORT ASSY
DISASSEMBLY
Some of the following pictures could not show exact-
ly the axle, but the procedure is the same.
Drain the oil completely from the differential.
Unscrew and remove the screws (2).
--- Page 13 ---
68 SECTION 25 - FRONT AXLES
Remove the discs (5) and (6).
Remove the gear (8) with the thrust washer (7).
Remove the pins (9) and (14), the planetary gears
(10), (13), (15) and (17) and the spherical washers
(22), (12), (16) and (18).
Remove the gear (19) with the thrust washer (20).
--- Page 14 ---
78 SECTION 25 - FRONT AXLES
Insert the washer (9) and screw up a new lock ring
nut (10) on the pinion end.
Screw up the lock nut with the wrenches 380002212
and 380002218.
SWARNING
The torque setting is given by the preloading meas-
urement on bearings. Tighten the ring nut step by
step.
NOTE: if it is tightened too much, the collapsible
spacer should be replaced and the procedure re-
peated.
When you check the preloading, strike the pinion
ends with a soft hammer to favour the bearings set-
tlement.
Carry out the bearings preloading measurement (P)
of the bearings, using a dynamometer whose cord is
wound on the splined pinion end (1).
The adjustment is carried out by increasing the ring
nut torque setting gradually, being careful not to ex-
ceed.
SWARNING
All preloadings must be measured without seal ring.
P = 9.2 ÷ 13.7 daN (20.6 ÷ 30.8 lbf)
--- Page 15 ---
2 SECTION 27 - REAR AXLES
NOTE: the drawing shows a standard rear axle, the
procedure for high speed axle is the same.
REMOVAL
Z Park the machine on a level surface.
Z Lift the loader and support it safely.
Z Shut off the engine and remove the ignition key.
Z Activate the parking brake.
Z Release the pressure from the hydraulic system.
Z Remove the cups (8) and unscrew nuts (7) from
both sides.
Z Remove the two wheels (6).
Z Disconnect the cardan joint (10).
Z Position the fork-lift truck laterally with the forks un-
der the rear axle (1), lift the rear axle and support it.
Z Disconnect pipes (5) and (9).
Z Disconnect pipes (11) and (12) from hydraulic mo-
tor.
Z Unscrew and remove screw (2) and nut (3).
Z Slide out the pin (4).
Z Lower the forks and remove the rear axle (1).
INSTALLATION
Z The assembly of the rear axle is to be carried out in
the reverse order.
Z Fill in oil in the reduction gears, in the transmission
box and axle body.
Z Lubricate the axle swinging.
--- Page 16 ---
12 SECTION 27 - REAR AXLES
LIMITED SLIP DIFFERENTIAL DISCS THICKNESS
New friction disc thickness = 1.6 ± 0.03 mm
New counterdisc thickness = 1.5 ± 0.03 mm (0.05 ± 0.001 in) (0.06 ± 0.001 in)
Worn counterdisc minimum thickness = 1.4 mm (0.055 in) Worn disc minimum thickness = 1.45 mm (0.057 in)
Disc ref. CA110643 - q.ty 10 Disc ref. CA110644 - q.ty 8
Disc ref. CA110642 - q.ty 2
New friction disc thickness = 2.8 ± 0.03 mm
(0.11 ± 0.001 in)
Worn disc minimum thickness = 2.7 mm (0.106 in)
--- Page 17 ---
22 SECTION 27 - REAR AXLES
Position the transmission box (4) on a workbench.
Remove the snap ring (12) from the shaft (1).
Remove the shaft (1) from the transmission box (4)
with a hammer and a driver.
Remove the cover (2) from the shaft (1), if neces-
sary.
NOTE: destructive operation for the cover (2).
Unscrew and remove the fastening screws (11) of
the cover (10).
In order the remove the cover (10) from its seat,
screw up two M8 screws in the extraction holes.
Remove the O-ring (7).
--- Page 18 ---
32 SECTION 27 - REAR AXLES
Remove the O-ring (41).
Unscrew the piston (45) with the wrench
380002244.
Remove the piston (45), the washer (44) and the
spring (43).
Remove the washer (42). Unscrew the splined
sleeve (40). Remove the splined sleeve (40) and the
O-ring (38).
--- Page 19 ---
42 SECTION 27 - REAR AXLES
Assemble the snap rings (26) and (28) on the gear
seats (27).
Assemble the bearing (29) on the gear (27).
Assemble the gear assy - bearing (27) and (29) on
the shaft (37).
Use the driver 380002217.
--- Page 20 ---
52 SECTION 27 - REAR AXLES
Unscrew and remove the two fastening screws (3)
of the planetary gears carrier (1) with a wrench.
Remove the planetary gears carrier (1) from the
wheel hub and remove the relevant O-ring (5).
Position the planetary gears carrier (1) on a work-
bench and check its wear conditions.
To carry out any possible replacement of the gears
(7):
Z remove the snap rings (10) on every pin (4);
Z remove the triangular plate (9);
Z take out the gears (8) from the pins;
Z collect the needle bearings (7) checking their con-
ditions;
Z collect the thrust washer (6).
--- Page 21 ---
62 SECTION 27 - REAR AXLES
Remove the bearing (9) from the wheel shaft end
using a commercial puller.
Remove the short half axle (11) from the wheel
shaft.
Unscrew and remove the wheel shaft fastening
screws (12).
SWARNING
Do not drop the wheel shaft; if necessary hold it by
means of a sling.
Remove the wheel shaft (13).
Remove the O-Ring (14) and check its conditions.
--- Page 22 ---
72 SECTION 27 - REAR AXLES
Apply the prescribed sealant on the stud bolt
threads (10) and tighten them to the prescribed
torque of 70 Nm (51 lbf·ft) using two nuts (nut and
lock nut).
Position the wheel hub (6) on a workbench and
force the two bearing cups (7) and (9) in position
with a driver 380002222 with a press or with a ham-
mer.
Insert the seal ring (8) on wheel shaft with the driver
380002213 and a hammer.
Insert the wheel hub (6) on the wheel shaft.
Heat the bearing (7) to 80 ÷ 100 °C (176 ÷ 212 °F).
Assemble the bearing.
SWARNING
Wear safety gloves.
Position the wheel carrier assy (2) on a workbench
and force bushings (4) at surface level with driver
380002231.
At least two bushings (diametrically-opposed)
should be set slightly higher than the carrier surface
level to be used as dowel pins.
--- Page 23 ---
82 SECTION 27 - REAR AXLES
Assemble the adjuster ring nuts (3) and (7) to the
differential support.
Tighten both adjuster ring nuts (3) and (7) with the
wrench 380000406 (a1) until the backlash is elimi-
nated and slightly preload the differential bearings.
Check that the differential bearings are well settled;
if necessary, knock them slightly with a soft ham-
mer.
Position a magnetic-base dial gauge on the differen-
tial support, so that the feeler stylus touches the sur-
face of one tooth of the crown gear with a 90° angle.
Lock the pinion and move the crown gear alterna-
tively and note the ring gear backlash, measured
with the comparator.
Repeat the operation on two or more points (teeth),
rotating the crown gear, so that to obtain an average
value.
Check if the measured backlash value is within the
requested range:
0.17 ÷ 0.24 mm (0.0066 ÷ 0.0094 in)
Carry out the adjustment by operating on the adjust-
er ring nuts with tool 380000406.
--- Page 24 ---
92 SECTION 27 - REAR AXLES
Fit the bevel gear crown (2) by using a hammer.
Apply Loctite 242 on the thread of the screws (1).
Tighten the screws (1) to the prescribed torque
95 Nm (70 lbf·ft).
NOTE: fix differential housing in the vice.
Install the bearing (3) with the driver 380002216.
--- Page 25 ---
102 SECTION 27 - REAR AXLES
Tap the shaft end with a soft hammer to remove the
bevel pinion (1).
SWARNING
Take care not to drop the bevel pinion.
Remove the shims (4) and (6), the collapsible spac-
er (5), the bearing (8) and the washer (9).
Take out the bearing cups (3) and (8) with a driver
and a hammer.
Remove the bearing (3) from the pinion (1) using a
puller.
Remove the bearing (3) and the shim (2).
--- Page 27 ---
112 SECTION 27 - REAR AXLES
7. SPECIAL TOOLS
Drivers and buffers for seals, bearing and bushes as-
sembly must be used with interchangeable the han-
dle 380002211; their use is recommended with a
safety handle for hands protection.
P/N CNH APPLICATION W50TC W60TC W70TC W80TC
380000406 Wrench • • • •
380000407 False differential box • • • •
380000443 Driver • / / /
380002211 Handle • • • •
380002212 Wrench • • • •
380002213 Driver / • • •
380002214 False differential box • • • •
380002215 Driver • • • •
380002216 Driver • • • •
380002217 Driver / • • •
380002218 Wrench • • • •
380002219 False pinion • • • •
380002221 Driver / • • •
380002222 Driver • • • •
380002223 Driver / • • •
380002224 Driver • • • •
380000225 Driver • • • •
380002226 Driver / • • •
380002227 Driver • • • •
380002228 Buffer • • • •
380002229 Driver / • • •
380002231 Driver / • • •
380002233 Buffer / • • •
380002235 Buffer • • • •
380002236 Buffer • • • •
380002237 Buffer • • • •
380002238 Driver • • • •
380002239 Driver / • • •
380002240 Driver / • • •
380002241 Driver / • • •
380002242 Buffer / • • •
380002243 Driver / • • •
380002244 Wrench / • • •
--- Page 28 ---
8 SECTION 33 - BRAKES SYSTEM
Coupling Use Thread
B Fan motor M22 x 1.5
F Accumulator pressure switch (80 bar (1160 psi)) M14 x 1.5
N Hydraulic oil tank (through one-way distributor valve) M18 x 1.5
P Oil delivery from the brake pump M22 x 1.5
R Emergency steering M10 x 1
R1 Accumulator M14 x 1.5
IP Inch port to axial pistons pump 1/4” BSP
IS Hydraulic oil tank (through one-way distributor valve) 1/4” BSP
F1 Brake light pressure switch M10 x 1
T1 Output to the service brake M14 x 1.5
HYDRAULIC DIAGRAM
1. Accumulator charging valve
2. Inch valve
3. Brake accumulator
4. Accumulator pressure switch
5. Brake light pressure switch
--- Page 29 ---
18 SECTION 33 - BRAKES SYSTEM
5. TROUBLESHOOTING
FAULT CAUSE ACTION
Abrupt braking. Pressure setting incorrect. Decrease pressure by handling on
the setscrew under the pedal. During
operation, pressure has to be
checked with a pressure gauge.
Insufficient braking action. Pressure setting incorrect. Increase the pressure with the
setscrew under the pedal. During
operation, pressure has to be
checked with a pressure gauge.
WARNING: the admissible braking
pressures must not be exceeded.
Delayed braking action and Insufficient charging and discharging Make sure the diameter of the lines
release of brake. speed of the brakes. in the brake system is not too small
with respect to their length and the
oil volume.
Viscosity of hydraulic oil too high. Fill the system with hydraulic oil of
prescribed viscosity.
Brakes remain engaged. Incorrect discharging of the brake The system is not completely
system. discharged and the residual
pressure continues to act on the
brakes.
Brake pedal does not return to Check that the stop screw of the
original position. pedal leaves some clearance
between pedal return and actuating
piston.
Remove obstacles under the pedal,
if any.
Brake lamp on instrument Pressure switch setting. Adjust the pressure switch on the
panel off or permanently lit up. charging valve to a value below
minimum pressure of the
accumulators, but high enough to
ensure 3 or 4 braking cycles after
lighting up of the lamp.
Inconstant brake pressure. The minimum pressure of the Check the correct setting of
accumulator is lower than the brake accumulator pressure. If necessary,
maximum pressure. correct the value on the setscrew of
the accumulator charging valve.
--- Page 30 ---
8 SECTION 35 - HYDRAULIC SYSTEM
1. Diesel engine
2. Pump at variable displacement
3. Double gear pump
4. Priority valve
5. Front axle
6. Rear axle
7. Brake pedal valve
8. Brake pedal valve accumulator
9. Power steering
10. Steering cylinder
11. Travel hydraulic motor
12. Hydraulic oil tank
13. Hydraulic oil return filter
14. Cooler
15. Fan motor
16. Load holding valve
17. One-way distributor valve
18. Working equipment control valve
19. Quick tool coupler cylinders
20. 3rd function cylinders
21. Dumping cylinder
22. Lifting cylinder
23. Quick tool coupler cylinders valve
24. Valve
25. Accumulator
26. Steering control valve
27. High speed valve
28. Safety valve
--- Page 31 ---
18 SECTION 35 - HYDRAULIC SYSTEM
1. Diesel engine LEGEND
2. Axial piston pump 1. Diesel engine - activates the system
3. Forward - reverse - idle gear actuator cylinder 2. Travel pump, at variable displacement - pro-
4. Maximum pressure relief valve vides the pressure to hydraulic motor
5. Feed pressure relief valve 4. Pressure relief valve - limits the high pressure in
6. Regulator valve the system
6/1.Orifice 5. Supply pressure relief valve - limits the feed
7. Pressure cut-off pressure
8. Supply pump 8. Supply pump - supplies the system with control
9. Gear pump and supply oil
10. Priority valve 12. Hydraulic motor - sets the machine in motion
11. Valve for forward, backward and reverse gear
engagement and actuation High pressure: pressure generated by the travel
12. Travel hydraulic motor pump to drive the hydraulic motor.
13. Creep speed engagement valve Supply pressure: pressure generated by the supply
14. Absorption flow rate activation cylinder pump.
15. Valve Control pressure: pressure required to swivel out
16. Feed pressure valve the travel pump.
17. Hydraulic oil tank
18. Oil supply filter
19. Hydraulic oil return filter
20. Cooler
21. Check valve
22. Brake pedal valve
23. Inch valve
24. One-way distributor valve
25. Accumulator charging valve
--- Page 32 ---
28 SECTION 35 - HYDRAULIC SYSTEM
REGULATOR VALVE (B)
Adjustment start
On measuring port (PHD) for forward speed connect
a pressure gauge (measuring range 600 bar
(8699 psi)). To measure the engine revolutions, you
have to connect also a proper revolution counter
(better if digital to be connected to injection pipes).
Once the road travel speed has been engaged, move
the loader against a wall or an heap of earth. Now the
engine revolutions hold on 1100 ± 100 min-1. During
this operation an high travel pressure (PHD), equal to
50 bar (725 psi) should be obtained.
To carry out adjustment, turn setscrew (2), after
loosing the safety nut (5). By unscrewing the set-
screw (2) the regulation start is “advanced”, by tight-
ening it the regulation begin is “delayed”. Once the
50 bar (725 psi) for high pressure have been adjust-
ed at a speed of 1100 ± 100 min, the safety nut has
to be retightened (5).
SWARNING
The regulator valves (B) for W50TC, W60TC,
W70TC and W80TC have each one different dia-
phragms (14).
This is the reason why the regulator valves are not
interchangeable between one machine model and
another.
1. Valve body
2. Setscrew
3. Safety nut
4. Spacer
5. Safety nut
6. Spring
7. Spring seat
8. Bushing
9. Ring
10. O-ring
11. Piston
12. Snap ring
13. Snap ring
14. Orifice
15. Piston housing
--- Page 33 ---
38 SECTION 35 - HYDRAULIC SYSTEM
To remove the complete cover (2) use a screwdriver
as shown in the figure.
Unscrew the nut (2) and remove the control plate (6).
Replace the O-ring (7).
If requested:
Z remove from the cover (2) the ring (9), the coupling
(8) and the gears (5) and (4);
Z replace the O-ring (3).
--- Page 34 ---
48 SECTION 35 - HYDRAULIC SYSTEM
Remove the snap ring (1).
Screw the two screws (V) into the holes of seal ring
(2).
Remove the seal ring (2).
Untighten and remove the caps (4) and the pins (3).
--- Page 35 ---
58 SECTION 35 - HYDRAULIC SYSTEM
Press the cylinder to the bottom.
Screw up the screw.
Groove in mounting position.
Assemble the valve plate assy with new O-ring.
To seat the valve plate assy correctly, follow the
mark applied during disassembly. Lock the valve
plate assy by tightening the fixing screws.
Assemble the auxiliary pump assy with control plate
and a new O-ring.
Fasten the auxiliary pump by means of fixing
screws.
--- Page 36 ---
68 SECTION 35 - HYDRAULIC SYSTEM
OPERATION
Rotary assy
The rotary assy consists of: control plate (1), seven The cylinders block can vary its tilting with relation to
pistons (2), drive shaft (3), cylinders block (4), spring the shaft axis from 5° to 25°. When the tilting angle
(5), central pivot (6), bearings (7), seal ring (8). is changed, also the piston stroke changes and as a
The hydraulic oil pressure is applied by the control consequence the generated torque.
plate (1) to the piston, these under the thrust of oil The output torque of the drive shaft depends on the
perform the extension stroke, and being bound to hydraulic pressure and on the tilting of cylinders
the drive shaft, convert their motion into rotary mo- block, while the rotating speed depends on the oil
tion of drive shaft. flow and on the tilting of cylinders block; so if the cyl-
The cylinders block turns with the pistons that by inders block tilting is reduces, as a consequence the
carrying out in sequence the extension stroke, gen- speed increases and the tractive force decreases,
erate an output torque on drive shaft. on the contrary, by increasing the angle the speed
The oil, after pistons displacement, is discharged on decreases and the traction force increases.
pistons return line during the retraction stroke.
--- Page 37 ---
78 SECTION 35 - HYDRAULIC SYSTEM
Check central pin for:
Z scores and pittings.
Check pistons for:
Z scores and pittings.
Check return plate for:
Z scores and wear.
Check cylinder for:
A. bores with scores and wear.
B. even surfaces, without splits or scores.
--- Page 38 ---
88 SECTION 35 - HYDRAULIC SYSTEM
9. TROUBLESHOOTING
FAULT POSSIBLE CAUSE ACTION
Hydraulic system does not
Oil level low. Top up system.
operate regularly.
Hydraulic filter clogged. Replace hydraulic filter.
Hydraulic system faulty. Consult your Dealer.
Hydraulic oil overheated. Oil level high or low. Top up oil level.
Oil filter element clogged. Replace filter.
Adjust delivery control for lower
Delivery control wrongly adjusted.
delivery.
Hydraulics of steering and
Transmission coupling faulty. Replace.
working system does not react.
Machine does not move. Hydraulic oil level too low. Refill.
Engine does not come under Operation faults in the pressure
Consult your Dealer.
load. control circuit of travel pump.
Travel motor not connected with rear
Recheck installation of travel motor.
axle.
Parking brake still applied. Release parking brake.
Parking brake switch still stuck in