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