User Manual

218
FAULTS AND REMEDIAL ACTIONS
9. Tractor no longer reaches maximum speed
Valve for mechanical speed limitation either
faulty or incorrectly set.
Fuel filter soiled.
Intercooler pressure too low.
Replace valve.
Replace filter box. Bleed air from the fuel system.
Check the charge air pressure.
10. Tractor does not pull
Cause
Feed quantity too flow.
Leak in the main circuit.
High-pressure limiting valve does not shut.
Flush valve stuck open.
Remedial Action
Measure feed and outlet pressure.
Measure feed and outlet pressure.
Measure control pressure.
Drive in opposite direction of travel.
11. System pressure too low
Cause
No feed for servo pump.
Servo pump does not deliver.
Leakage in pressure or suction line.
40 bar pressure limiting valve does not close.
18 bar pressure control valve does not close.
Leak in comfort circuit.
Remedial Action
Check lubricating pressure.
Check servo pump pressure.
Check oil level in clutch housing (too high).
Measure servo pump pressure (= lubrication
pressure).
Measure feed pressure (= system pressure).
Measure feed pressure, visual check.
12. Inlet pressure too low
Cause
No feed for servo pump.
Servo pressure less than 18 bar.
Leak in comfort circuit.
Leak in feed line.
Leak in outlet line.
Hydrostatic drive leaks or lifts off.
High-pressure valve is loose.
Output pressure control valve does not shut.
Input pressure control valve does not shut.
Remedial Action
Check lubricating pressure (= 0)
Measure servo pressure.
Measure servo pressure, visual check.
Measure output pressure (too low).
Measure output pressure (too low).
Measure output pressure (too low).
Measure output pressure (too low).
Measure output pressure (too low).
Measure output pressure (= input pressure).
13. Output pressure too low
Cause
Remedial Action
Input pressure too low.
Measure input pressure (too low).
Leak in outlet line.
Measure input pressure (under load too low,
without load OK).