
TROUBLESHOOTING
9
Effect of Trouble
Possible Cause
Fault Which Needs Remedy
Compensator, Compensator Override
Low system pressure
Compensator malfunction
Dirt in spool orifice
Damaged cone or seat
Broken differential spring
Improperly adjusted differential spring
Failure to compensate
Differential adjustment
Differential set too high
Sluggish response
Differential adjustment
Differential set too low
Wide pressure fluctuations (hunting)
Excessive line capacitance
Install check valve near pump outlet
Load Sensing Control
Low system pressure
Compensator malfunction
Dirt in spool orifice
Damaged cone or seat
Broken differential spring
Improperly adjusted differential spring
Failure to compensate
Differential adjustment
Differential set too high
Sluggish response
Differential adjustment
Differential set too low
Modulating valve
Air in load sensing line
Wide pressure fluctuations (hunting)
Excessive line capacitance
Install check valve near pump outlet
Modulating valve
Air in load sensing line
Excessive pressure drop across
Differential adjustment
Differential set too high
control valve
Poor control of flow
Differential adjustment
Differential set too low
Torque Limiter, Torque Limiter Override
Torque setting erratic
Torque limiter cap malfunction
Sticking pin
Torque incorrect at high flows
Incorrect torque setting
Outer adjustment screw
Torque incorrect at low flows
Incorrect torque setting
Inner adjustment screw
Too much torque variation
Wrong torque limiter for range
Replace inner/outer springs with correct springs
Low system pressure
Compensator malfunction
Dirt in spool orifice
Damaged cone or seat
Broken differential spring
Improperly adjusted differential spring
Failure to compensate
Differential adjustment
Differential set too high
Sluggish response
Differential adjustment
Differential set too low
Wide pressure fluctuations (hunting)
Excessive line capacitance
Install check valve near pump outlet
Rotary Servo
Failure to stroke
Differential adjustment
Differential set too low
Goes to full
Differential adjustment
Differential set too high
Sluggish response
Low servo pressure
Check servo pressure
Strokes in steps
Servo cap malfunction
Sticking pin
Wear on linkages or input cam surface
Hydraulic Stroker
Failure to stroke
Differential adjustment
Differential set too low
Goes to full
Differential adjustment
Differential set too high
Strokes in steps
Servo cap malfunction
Wear on linkages, Sticking stroker piston
Electric Stroker
Failure to stroke
Differential adjustment
Differential set too low
Goes to full
Differential adjustment
Differential set too high
Excessive hysteresis
Electric proportional valve
Change dither on electrical signal
No response
Electric proportional valve
Faulty wiring, Filter screen plugged
Strokes in steps
Servo cap malfunction
Wear on linkages
Sticking stroker piston
Instability
Air in control
Bleed air from control
Check for air in servo supply
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Содержание P07 C-mod
Страница 12: ...PUMP PARTS LISTS 12 Ref Figure 1 Exploded view of pump with pressure compensator control www comoso com ...
Страница 54: ...PQ HIGH RESPONSE CONTROL 54 PQ CONTROL IN PROCESS OF DEVELOPMENT www comoso com ...
Страница 55: ...PQ HIGH RESPONSE CONTROL 55 PQ CONTROL IN PROCESS OF DEVELOPMENT www comoso com ...
Страница 56: ...PQ HIGH RESPONSE CONTROL 56 PQ CONTROL IN PROCESS OF DEVELOPMENT www comoso com ...
Страница 57: ...PQ HIGH RESPONSE CONTROL 57 PQ CONTROL IN PROCESS OF DEVELOPMENT www comoso com ...
Страница 74: ...74 TEST PROCEDURE PQ CONTROL IN PROCESS OF DEVELOPMENT www comoso com ...