Terex Evoquip Bison 120, Operation Manual

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10 Troubleshooting
Operations Manual
Bison 120
20-07-2018
Page 10-6
Revision 2.0
Fault Cause Correct Measure
Oil in system
becomes excessively
hot
Pump running continuously
under pressure
Check for symptoms of pressure
build up
Check pressure on all hydraulic
circuits
Machine operating
slowly. (No external oil
leaks)
Low oil level Top up hydraulic oil level
Incorrect hydraulic oil
Drain tank and replace hydraulic
oil
Engine performance Consult engine manual
Loose or damaged taper locks Tighten / replace taper lock
Worn or damaged drive motor Replace motor
Worn or damaged pump Replace pump
Crusher CSS
adjustments not
possible
Unseated unloader valve Replace valve
Directional control valve
inoperative
Check operation of solenoid,
replace if necessary.
Check for possible sticking
spool on valve, dismantle clean
and replace parts or complete
assembly
Solenoid - operation
Check operation of solenoid,
replace as necessary
Mechanical blockage on crusher Investigate crusher
External leakages
Make visual inspection.
Tighten connections
Renew pipes, hoses or couplings
as necessary
Mechanical failure of the crusher Visually check the machine for
mechanical damage
Low oil level Top up oil level
Dirt in relief valve
Screw the adjuster out a few
original setting. It dislodges dirt
under the ball seat.
If no response, remove unit,
dismantle and clean particularly
the jet.
Replace in system
Faulty relief valve
Check valve spring, renew as
necessary
External leakages
Make visual inspection.
Tighten connections
Renew pipes, hoses or couplings
as necessary
Mechanical failure of the crusher Check to see if any object
touched the machine