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Troubleshooting
Relieve the pressure before you check or service the
equipment.
Check all possible problems and causes before you
disassemble the pump.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Internal Air Valve-Operated and Remote Solenoid-Operated Pumps
PROBLEM CAUSE SOLUTION
The pump cycles at stall, or it fails
to hold pressure at stall.
The check valves (20) or o-rings
(21) are leaking.
Replace the check valves and/or
o-rings. See page 14.
The check valves (20) are worn. Replace the check valves.
See page 14.
Debris is stuck between the a check
valve (20) and the seat.
Clean the check valve/seat area.
See page 14.
The pump operates erratically. The suction line is clogged. Inspect and clear the line.
The check valves (20) are sticking
or leaking.
Replace the check valves, or clean
and check the valve/seat area.
See page 14.
A diaphragm (30) is ruptured. Replace the ruptured diaphragm.
See page 13.
There are air bubbles in the fluid. The suction line is loose. Tighten the suction line.
A diaphragm (30) is ruptured. Replace the ruptured diaphragm.
See page 13.
The manifold (52) is loose, or the
o-rings (21) are damaged.
Tighten the manifold screws (58).
Replace the o-rings (21).
See page 14.
The fluid covers (51) are loose. Tighten the fluid cover screws (58).
See page13.
There is fluid in the exhaust air. A diaphragm (30) is ruptured. Replace the ruptured diaphragm.
See page 13.
A diaphragm plate (50) is loose. Tighten the diaphragm plate.
See page13.
The pump exhausts air near the
fluid covers.
The fluid covers (51) are loose, or
the o-rings (57) are damaged.
Tighten the fluid cover screws (58),
or replace the o-rings. See page13.
The pump exhausts air near the air
valve.
The air valve cover screws (14) are
loose.
Tighten the screws. See page 12.
The top (5) and/or side (6) air valve
o-rings are damaged.
Replace these o-rings.
See the Parts Drawing on
page 17.
The pump leaks fluid from the
check valves.
The o-rings (21) are leaking, or the
screws (58) are loose.
Replace these o-rings, and tighten
the screws. See page 14.