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8 Operating Problems

TC29

Fault Possible cause Remedy

8.5 Excavator installation is not working

1 Exit barrier lifted or shutoff valve damaged Lower exit barrier and/or check shutoff valve or

replace or repair if necessary.

2 Oil supply to hydraulic pump interrupted Check pipes.

3 Hydraulic pump has failed Have hydraulic pump checked by a specialist

and replace, if necessary

4 Main pressure relief valves have failed or

are mis-adjusted

Check main pressure relief valve and replace, if

necessary

8.6 Decrease in machine’s performance

1 Insufficient engine power Check diesel engine.

2 Hydraulic oil level too low Top up hydraulic oil to the mark

3 Pump is sucking up air Tighten hose connections. Replace O-ring or

seals

4 Insufficient operating pressure Re-adjust or replace main pressure relief valves

8.7 Machine is working too slowly and hydraulic oil is becoming too hot

1 Incorrect adjustment of main pressure

relief valves, damaged valves

Re-adjust main pressure relief valves or replace

if necessary

2 Hydraulic pump worn Replace hydraulic pump

3 Incorrect hydraulic oil Quality of hydraulic oil must conform to our

recommendation

4 Oil level too low Top up oil to the mark on the sight glass

5 Oil cooler dirty or damaged Clean, check and replace if necessary

6 Air in hydraulic system Tighten connections with engine off and system

relieved of pressure

8.8 Uppercarriage is slewing too far

1 Secondary valves damaged or mis-

adjusted

Re-adjust secondary valves and replace if

necessary

2 Swing motor is leaking - internal wear Replace hydraulic motor

Terex TC29 User Manual

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