Troubleshooting
12
Troubleshooting
Relieve the pressure (page 10) before checking or
servicing the equipment.
Check all possible problems and causes before
disassembling the pump.
Problem
Cause
Solution
Pump cycles at stall or fails to hold
pressure at stall.
Worn check valve balls (56), seats
(53), or ball guides (57).
Replace. See page 19.
Pump will not cycle, or cycles once
and stops.
Stuck or dirty air valve.
Disassemble and clean air valve. See
page 17. Use filtered air.
Check valve ball (56) severely worn
and wedged in seat (53).
Replace ball and seat. See page 19.
Check valve ball (56) wedged in seat
(53) due to overpressurization.
Replace. See page 19. Do not
exceed the maximum fluid working
pressure, see page 25.
Clogged fluid dispensing valve.
Relieve pressure and clear valve.
Pinched hose line.
Check lines.
Pump operates erratically.
Clogged suction line.
Inspect; clear.
Sticky or leaking check valves.
Clean or replace balls (56) and seats
(53). See page 19.
Ruptured diaphragm (14).
Replace. See page 15. Do not
exceed maximum air input pressure.
Restricted exhaust.
Remove restriction.
Air bubbles in fluid.
Loose suction line.
Tighten.
Ruptured diaphragm (14).
Replace. See page 15.
Pump running irregularly. Stroke fre-
quency dropping, coming to stand-
still.
Worn parts.
Replace worn parts. Check com-
pressed air supply.
Icing caused by: compressed air too
moist, stroke frequency too high,
local temperature too low.
Remove ice by changing operating
conditions.
Air escapes continually from muffler.
Damaged air valve cup (47) or seat
(33).
Replace damaged parts. See page
17.
Foreign matter inside pump.
Check air filter.
Pump does not start, or pressure
fluctuates.
Worn check valve seats (53).
Replace. See page 19.
Inlet strainer blocked, maximum suc-
tion exceeded, hose or seal defec-
tive.
Clean strainer. Replace defective
parts.
Contaminated fluid. Pump installed or
operated incorrectly.
Check fluid supply. Follow installa-
tion and operation instructions in this
manual.
