308155 11
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
Note: Check all possible problems and solutions
before disassembling the pump or reciprocator.
Problem Cause Solution
Pump won’t run. Closed dispense valve. Pump only runs with valve open.
Pressure too low. Increase supply pressure using a
pressure adjusting valve.
Insufficient hydraulic fluid supply. Check hydraulic supply. Adjust to a
maximum of 3 gpm (11 lpm) flow.
Clogged fluid outlet line, intake valve,
dispense valve, suction line.
Relieve pressure. Check; clear
obstructions.
Reciprocator damaged. Repair. See page 14.
Pump speeds up or runs erratically. Pump piston and/or intake
valve worn.
Relieve pressure. Check and repair.
See page 20.
Empty supply container. Refill and reprime. Do not allow pump
to run dry. Monitor closely or use a
low-level cutoff valve.
Pump runs, but output low on up
and/or down stroke.
Pump piston and/or intake valve
worn.
Relieve pressure. Check and repair.
See page 20.
Pump runs but output low on both
strokes.
Insufficient hydraulic fluid supply. Check hydraulic supply. Adjust to
maximum 3 gpm (11 lpm) flow.
Pressure too low. Increase supply pressure using a
pressure adjusting valve.
Clogged fluid outlet line, intake valve,
dispense valve, suction line.
Relieve pressure. Check; clear
obstructions.
Excessive weepage from weep
tube (B).
Worn throat packings. Repair. See page 12.
Hydraulic oil leaks from fittings in the
upper or lower reciprocator blocks
(31, 32).
Fittings (1,5,58) are loose, or their
o-rings are worn or damaged.
Tighten the self-sealing fittings. If
leaking persists, change the
o-rings.
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