Terex TW85, Operating Instructions Manual

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8 Troubleshooting
108 TW85
Fault Possible cause Remedy
8.7 No zero position of travel direction
1 Switch for travel direction damaged (short-
circuit) Repair or replace
2 Magnet gets stuck or is damaged Repair or replace
3 Centring actuator has no neutral position Check, re-calibrate (call Service Agent)
4 Internal damage to variable displacement
pump Replace pump completely
8.8 Hydraulic oil exceeds max. admissible temperature
1 Thermo switch damaged Replace
2 Oil level too low Top up oil to the mark on the sight glass
3 Oil cooler dirty or damaged Clean, check and replace if necessary
4 Suction filter clogged Replace
5 High-pressure valves do not respond all
the time Check high-pressure valves, re-adjust if
necessary
6 Flushing circulation not functioning Check pressure of flushing and charge pump,
possible back pressure in cooling circuit, check
housing pressure
7 Variable displacement pump or variable
displacement motor damaged (wear) Replace
8.9 Sluggish acceleration and deceleration, too little propulsive power
1 Insufficient engine power Check diesel engine
2 Some brake has got stuck Check, remedy damage
3 No tank pressurization Check tank seal, replace
4 Suction filter clogged Replace filter
5 Oil loss in rotary joint Re-seal rotary joint
6 Charge pump sucking up air Check, re-seal
7 Insufficient charge or supply pressure Check pressure, adjust
8 Pressure relief valve of charge circuit dirty
or damaged Check, re-adjust or replace
9 Insufficient high-pressure Check high-pressure (pressure cut-off); if
necessary, re-adjust
10 Variable displacement pump does not
open fully Insufficient pilot pressure. Mechanical damage to
pump adjustment. Check, re-adjust or repair
11 Adjusting motor not adjusting Adjustment start is set too high. Mechanical
damage on controller or adjustment.
Adjust or call Service Agent
12 Internal damage to variable displacement
pump or variable displacement motor Replace unit