DIAGNOSE HYDRAULIC SYSTEM MALFUNCTIONS
NOTE: Diagnose malfunction charts are arranged from
most probable and simplest to verify, to least
likely and most difficult to verify.
All Hydraulic Functions Slow
Low oil level
Check oil level in hydraulic oil tank.
Cold hydraulic oil
Heat hydraulic oil.
Oil viscosity too heavy
Use the recommended oil. (See
General Information Section.)
Slow engine speed
Check engine fast and slow idle stop
adjustment at injection pump. Do
Engine Control Motor and Sensor
Adjustment and Engine Speed
Learning Procedure. See Group
Air leak in pump suction line
Check for air bubbles in oil. Tighten
clamps, replace O-rings.
Pilot circuit malfunction
See Diagnose Pilot Circuit
Malfunctions. See Group 9025-15.
Restricted pump suction screen
Clean pump suction screen. See
Front and rear pump regulators
Adjust pump regulators. See Group
Check flow rate using propel cycle
times. Do Hydraulic Pump Flow
Test. See Group 9025-25.
System relief valve setting too low or
Check system relief valve setting.
See Group 9025-25. Inspect. See
Circuit relief valve setting too low or
Check circuit relief valve setting. See
Group 9025-25. Inspect. See Group
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