12 308-262
Troubleshooting
WARNING
T
o reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 10.
Before servicing this equipment, always make sure to
relieve the pressure.
NOTE:
Check all possible problems and solutions
before disassembling the pump.
PROBLEM CAUSE SOLUTION
Pump
fails to operate.
Inadequate
air supply pressure or restricted
air
line.
Increase air supply (see T
echnical Data on page 30).
See Maximum Working Pressure warning on page 8.
Clear
line.
Closed or clogged air valves.
Open valves; clean.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Open, clear.* Use hose with larger ID, or use shorter
hose.
Dirty,
worn, or damaged air motor parts.
Clean or repair; see pages 20 to 25. Lubricate with
grease.
Obstructed
priming tube.
Open, clear
.
Pump operates, but out-
put
low on both strokes.
Inadequate
air supply pressure or restricted
air
line.
Increase air supply (see T
echnical Data on page 30).
See Maximum Working Pressure Warning on page 8.
Clear
line.
Closed or clogged air valves.
Open valves; clean.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Open, clear.* Use hose with larger ID, or use shorter
hose.
Exhausted
fluid supply
.
Refill and reprime or flush.
Air leaking into supply container
.
Check follow plate or inductor plate seal.
Fluid too heavy for pump priming.
Use inductor or follow plate.
W
orn seals in displacement pump.
Replace seals. See page 18.
Pump operates, but out-
put
low on downstroke.
Fluid too heavy for pump priming.
Use inductor or follow plate.
Held
open or worn
intake valve or seal (105).
Clear
valve; replace seal. See page 18.
Pump operates, but out-
put
low on upstroke.
Held
open or worn
piston valve or seal (103).
Clear
valve; replace seal. See page 18.
Erratic or accelerated
pump
speed.
Exhausted fluid supply
.
Refill and reprime or flush.
Fluid too heavy for pump priming.
Use inductor or follow plate.
Held
open or worn
piston valve or seal (103).
Clear
valve; replace seal. See page 18.
Held
open or worn
intake valve or seal (105).
Clear
valve; replace seal. See page 18.
*
Relieve the pressure,
and disconnect the fluid hose. T
urn on the air
. If the pump starts when the air is turned on, the clog is in
the fluid hose or dispense valve.
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