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HYDRAULIC SCHEMATIC
QTFSG/QTFSD 98349 05/15/03
4-15
HYDRAULIC TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
Hopper will not lift
Loss of power to rocker
switch
Key switch must be on check circuit breaker
Low hydraulic fluid Add hydraulic fluid
Hopper overloaded Empty hopper
Rocker switch failure Test – replace switch
Speed control orifice
plugged
Clean or replace orifice (located behind the lower
cylinder fitting)
Pump solenoid failure Replace pump solenoid
Check valve failure Replace check valve or solenoid
Lift cylinder failure Replace cylinder seals
Gear pump failure Replace pump or pump motor
Hopper will not lower
Loss of power to rocker
switch
Key switch must be on, check circuit breaker
Rocker switch failure Test – replace switch
Speed control orifice
plugged
Clean or replace orifice (located behind the lower
cylinder fitting)
Check valve failure Replace check valve or solenoid