10 - 7
Section E
Hydraulics
9803/8500
Section E
10 - 7
Issue 2
Pumps
Fault Finding
Servo machines up to serial no. 676354
Machine veers to one side when travelling.
Servo unit adjustment
The diagram shows the main pump servo units when viewed
from the side door of the cab.
Note:
The servo unit adjuster screws are normally set to
allow 5 mm gap when pump piston is at full swash. Therefore
to limit piston travel it is necessary to screw in the grubscrews
by approximately 5 mm before adjustment can take place.
If the machine does not travel in a straight line, proceed as
follows:
Fault
1
Machine veers excessively to left in forward travel
2
Machine veers excessively to right in forward travel
3
Machine veers excessively to left in reverse travel
4
Machine veers excessively to right in reverse travel
Loosen locknut on adjuster screw
A
, screw in grub screw
approx. 5mm and tighten locknut. Try machine. Keep
adjusting
2
turn at a time until straight line travel is achieved.
Proceed as for fault 1 but adjust screw
D
.
Proceed as for fault 2 but adjust screw
B
.
Proceed as for fault 3 but adjust screw
C
.
A
A
C
C
B
B
D
D
This condition may be corrected by adjusting the pump servo units but before attempting this, carry out the following preliminary
checks.
Check tyre pressures
The pressure of one tyre may be low or one or both tyres on one side of the machine may be new
and condition
and the other tyres worn. In both these cases the rolling circumference of the tyres will be unequal
causing the machine to veer to one side.
Check chain tension
Chains which are tensioned unequally will cause the machine to veer to one side. Always adjust the
tension on all four chains, never just one.
Check brake release
Low pressure or faulty seals may cause the brake to drag on one side. Check the pressure at the
pressure, seal failure
anti-stall valve. Check the seal by using a hand pump to release the brake and see if the pressure
holds.
Check the drive joystick
Check that the joystick spools are not sticking and are correctly operated by the lever.
Note:
If the fault cannot be rectified by any of the above checks or adjustment, then either the pump or motor could be faulty. To
identify which, swop the motor feed hoses at the pump. If the machine now veers in the opposite direction then the pump is
faulty. If the machine continues to veer in the same direction the the motor is faulty.
Содержание ROBOT 150
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Страница 21: ...5 2 Safety Decals cont d Section 2 Care and Safety 9803 8500 Section 2 5 2 Issue 2...
Страница 77: ...Attachments Section A Section A 7 7 9803 8500 Issue 1 Backhoe...
Страница 83: ...3 4 Side Windows Section B Body and Framework 9803 8500 Section B 3 4 Issue 1 Glazing 136161 1 1 2 2 3 3 4 4...
Страница 86: ...5 1 Section B Body and Framework 9803 8500 Section B 5 1 Issue 1 Loader Arm 167760 Z Z B B A A X X Y Y...
Страница 97: ...4 3 Section C Electrics 9803 8500 Section C 4 3 Issue 1 Alternator S213570...
Страница 123: ...1 1 Section D Controls 9803 8500 Section D 1 1 Issue 1 Safety Restraint Bar S168160 1...
Страница 125: ...2 1 Section D Controls 9803 8500 Section D 2 1 Issue 1 Throttle Controls S168150D...
Страница 142: ...Hydraulics 9803 8500 Issue 1 4 1 4 1 Descriptions Section E Section E...
Страница 145: ...Hydraulics 9803 8500 Issue 2 5 2 5 2 Descriptions Section E Section E...
Страница 146: ...Hydraulics 9803 8500 Issue 2 5 3 5 3 Descriptions Section E Section E...
Страница 149: ...Hydraulics 9803 8500 Issue 2 5 6 5 6 Descriptions Section E Section E...
Страница 152: ...Hydraulics 9803 8500 Issue 1 5 9 5 9 Descriptions Section E Section E...
Страница 163: ...10 1 Section E Hydraulics 9803 8500 Section E 10 1 Issue 1 Pumps 168150...
Страница 165: ...10 3 Section E Hydraulics 9803 8500 Section E 10 3 Issue 1 Pumps 168030...
Страница 167: ...10 5 Section E Hydraulics 9803 8500 Section E 10 5 Issue 1 Pumps 168160...
Страница 175: ...11 1 Section E Hydraulics 9803 8500 Section E 11 1 Issue 2 Pumps 167750...
Страница 179: ...13 1 Section E Hydraulics 9803 8500 Section E 13 1 Issue 1 Drive Motors 167720 S167720A...
Страница 181: ...13 3 Section E Hydraulics 9803 8500 Section E 13 3 Issue 2 Drive Motors S167730 A A B S167730B S167730A...
Страница 183: ...13 5 Section E Hydraulics 9803 8500 Section E 13 5 Issue 1 Drive Motors S243720 X X S243870...
Страница 212: ...18 1 Section E Hydraulics 9803 8500 Section E 18 1 Issue 2 Valves S204980 X X 3 B A 4 2 1 5...
Страница 215: ...20 1 Section E Hydraulics 9803 8500 Section E 20 1 Issue 1 Servo Joysticks S167960...
Страница 217: ...20 3 Section E Hydraulics 9803 8500 Section E 20 3 Issue 1 Servo Joysticks 167950...
Страница 221: ...23 3 Section E Hydraulics 9803 8500 Section E 23 3 Issue 1 Rams S167800...
Страница 241: ...1 2 Section F Transmission 9803 8500 Section F 1 2 Issue 2 Tyres and Wheels 167861 167811...
Страница 243: ...1 4 Section F Transmission 9803 8500 Section F 1 4 Issue 2 Tyres and Wheels 167851...
Страница 253: ...2 1 Section K Engine 9803 8500 Section K 2 1 Issue 1 Removal and Replacement S167990...