SECTION 3 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS
3121801 3-19
Table 3-3. Hydraulic System Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Hydraulic System - General
Hydraulic Pump Noisy
Air bubbles in oil. (Reservoir too low.) Replenish oil as necessary.
Oil filter dirty. Clean and/or replace filter as necessary.
Pump cavitating. (Vacuum in pump due to oil starvation)
Oil in reservoir low. Replenish oil as necessary.
Restricted reservoir air vent. Clean vent.
Oil viscosity too high. Drain system and replace with recommended oil. Refer to
Hydraulic Oil.
System overheating
Oil viscosity too high. Drain system and replace with recommended oil. Refer to
Hydraulic Oil.
Main relief valve set too high. Adjust relief valve to proper pressure.
Hydraulic system oil low. Replenish oil as necessary.
Pump not delivering oil
Defective pump. Repair or replace pump.
System pressure too low
Main relief valve set too low. Reset valve as required
Hydraulic pump not functioning properly. Repair or replace pump.
Leak in component, line or fitting. Repair or replace component, line or fitting.
Scored valve spool; scored cylinder. Replace valve; replace cylinder.
System(s) operate erratically
Sticking or binding valve cartridge, piston rod, etc. Clean, repair or replace components as necessary
Hydraulic oil not at operating temperature. Allow oil sufficient time to warm up.
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