Table of Contents
Advertisement
Troubleshooting
Relieve the pressure (page 9) 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.
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.
Damaged air valve cup (47) or seat
(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 20.
Disassemble and clean air valve. See
page 18. Use filtered air.
Replace ball and seat. See page 20.
Replace. See page 20. Do not
exceed the maximum fluid working
pressure, see page 26.
Relieve pressure and clear valve.
Check lines.
Inspect; clear.
Clean or replace balls (56) and seats
(53). See page 20.
Replace. See page 16. Do not
exceed maximum air input pressure.
Remove restriction.
Tighten.
Replace. See page 16.
Replace worn parts. Check com-
pressed air supply.
Remove ice by changing operating
conditions.
Replace damaged parts. See page
18.
Check air filter.
Replace. See page 20.
Clean strainer. Replace defective
parts.
Check fluid supply. Follow installa-
tion and operation instructions in this
manual.
Troubleshooting
Solution
309476B
Advertisement
Table of Contents
