8 Troubleshooting
98 TW9
Fault Possible cause Remedy
8.7 Hydraulic oil exceeds max. admissible temperature
1 Thermo switch damaged Replace
2 Oil level too low Top up oil to mark on dipstick
3 Oil cooler dirty or damaged Clean, check and replace if required
4 Suction filter clogged Replace
5 High-pressure valves do not respond all
the time or too early
Check high-pressure valves, re-adjust or replace
if necessary
6 Flushing circulation not functioning Check pressure of flushing and charge pump,
possible back pressure in cooling circuit, check
housing pressure
7 Travel pump or travel motor damaged
(wear)
Replace
8 Loader pump worn Replace
9 Main pressure relief valve damaged Replace
8.8 Sluggish acceleration and deceleration, too little propulsive power
1 Insufficient engine power Check diesel engine
2 Brake has got stuck Check, remedy damage
3 No tank pressurization Check ventilation filters and breathers, replace
4 Suction filter clogged Replace filter
5 FAST-SLOW-gear not functioning due to
electric or mechanical fault
Check power supply and solenoid valve, repair
and replace if necessary
Check travel motor
6 Fault in operation of brake-inching pedal Check, adjust, replace
7 Charge pump sucking up air Check, eliminate leaks
8 Travel pump incorrectly adjusted Re-adjust travel pump
9 Insufficient charge or supply pressure Check pressure, adjust
10 Pressure relief valve of charge circuit dirty
or damaged
Check, re-adjust or replace
11 Insufficient high-pressure Check high-pressure; re-adjust or replace
pressure cut-off and high-pressure valves if
required.
12 Travel pump does not open fully, pilot
pressure too low
Nozzles clogged, check, repair
13 Internal damage to travel pump or travel
motor
Replace units
14 Travel motor mis-adjusted Re-adjust travel motor
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