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Troubleshooting
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow
the Pressure Relief Procedure (page 10).
For pump service see pump manual.
Problem Cause(s) Solution(s)
Pump output low on both strokes Restricted air or hydraulic lines Clear any obstructions; be sure all
valves are open; increase pressure.
Empty fluid supply Refill and reprime pump. In an air-pow-
ered system, use pump runaway valve.
Clogged fluid outlet line, valves, etc. Clear.
Worn packings Tighten packing nut; replace all pack-
ings. See pump manual.
Pump output low on only one stroke Worn pump seals Check and repair. See pump manual.
No output Improperly installed ball check valves Check and correct. See pump manual.
Pump operates erratically Exhausted fluid supply Refill and reprime pump. In an air-pow-
ered system, use pump runaway valve.
Worn pump seals Check and repair. See pump manual.
Pump does not operate Restricted air or hydraulic power sup-
ply lines
Clear any obstructions; be sure all shut-
off valves are open; increase pressure.
Exhausted fluid supply Refill and reprime pump.
Clogged fluid outlet line, valves, etc. Clear.
Fluid dried on piston rod Disassemble and clean pump. Stop
pump at bottom of stroke. See pump
manual.