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Table 1, Troubleshooting Guide
Problem
Possible Cause
Action*
Pump will not start
Fault condition
See Section 5.0, Operation and 6.3, Fault Conditions for
details
Pendant does not function
Pump in local mode
Pendant damage
See Section 6.2L, Local Menu
See Section 6.2N, Diagnose Menu
See authorized service center
Motor stops under load
Low voltage
See Sections 6.3B and 6.4A
Turn off other electric loads
Use heavier gauge extension cord
Electric valve will not operate
No power or wrong voltage
Solenoid cable disconnected or damaged
Valve out of adjustment
Connect to correct power source per pump name plate
Connect, repair, or replace cable
See authorized service center
Pump fails to build pressure or
less than full pressure
Low oil level
Relief valve set too low
External system leak
Internal leak in pump
Internal leak in valve
Internal leak in system component
Add oil per Section 4.4
Adjust per Section 5.4
Inspect and repair or replace
See authorized service center
See authorized service center
See authorized service center
Pump builds full pressure, but
load does not move
Load greater than cylinder capacity at full pressure
Flow to cylinder blocked
Reduce load or add cylinder capacity
Check hydraulic couplers for full engagement
Cylinder drifts back on its own
External system leak
Internal leak in a system component
Non-load holding valve used
Inspect all hydraulic connections and replace or repair
See authorized service center
See authorized service center
Single-acting cylinder will
not return
No load on a “load return” cylinder
Return flow restricted or blocked
Valve malfunction
Cylinder return spring broken
Add load
Check couplers for full engagement
See authorized service center
See authorized service center
Double-acting cylinder will not
return
Return flow restricted or blocked
Valve malfunction
Check couplers for full engagement
See authorized service center
Pump runs hot
Advance or retract flow restricted
High ambient temperature
Check couplers for full engagement
Install heat exchanger for hydraulic oil
Pump pressure goes above
“PRESR A” or “PRESR B” value
Cylinder comes to a sudden stop (i.e., strokes out)
Set user adjustable relief valve 200 psi above “PRESR A”
or “PRESR B” value to redirect excess oil flow
Dwell Mode does not work
correctly
Pressure transducer installed in pressure port other
than “GP”
Move pressure transducer to “GP”
After boot-up, LCD display
shows “P switch open”
Pressure switch circuit is open
See authorized service center.
LCD display shows “FILTER”
Loose jumper on power board
See authorized service center.
* As required during troubleshooting, refer to sections 6.2 LCD Menus, 6.3 Fault Conditions and 6.4 Warning Conditions.