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9307013
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
Before servicing this equipment always make sure to
Relieve the Pressure.
Note: Check all possible causes and solutions before
disassembling the pump.
Problem Cause Solution
Pump fails to operate
Restricted line or inadequate air supply Clear; increase air supply.
Obstructed fluid hose, gun, or dispensing
valve
Open, clear.*
Exhausted fluid supply Refill; Purge all air from pump and fluid
lines.
Fluid dried on displacement rod Clean; always stop pump at bottom of
stroke; keep wet-cup 1/2 filled with com-
patible solvent.
Damaged air motor Service air motor (see manual 306968).
Pump operates but output low on both
Restricted line or inadequate air supply Clear; increase air supply.
strokes
Obstructed fluid hose, gun, or dispensing
valve
Open, clear.*
Exhausted fluid supply Refill; purge all air from pump and fluid
lines.
Air in displacement pump and hose Reprime.
Check valves need adjustment Adjust (see manual 307728).
Packing nut too tight or too loose Adjust (see manual 307728).
Worn throat packings Replace (see manual 307728).
Pump operates but output low on
down stroke
Held open or worn intake valve Clear; service (see manual 307728).
Pump operates but output low on up
stroke
Held open or worn fluid piston valve or
packings
Clear, service (see manual 307728).
Erratic or accelerated operation
Exhausted fluid supply Refill; purge all air from pump and fluid
lines.
Packing nut too tight Adjust (see manual 307728).
Check valves need adjustment Adjust (see manual 307728).
Held open or worn intake valve Clear; service (see manual 307728).
Held open or worn fluid piston valve or
packings
Clear; service (see manual 307728).
* To determine if the fluid hose or gun/valve is obstructed, relieve the pressure. Disconnect the fluid hose and place a container
at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump (about 20–40 psi [140–280 kPa, 1.4–2.8
bar]). If the pump starts when the air is turned on, the obstruction is in the fluid hose gun/valve.