Troubleshooting
312795E 17
Troubleshooting
NOTE: Check all possible problems and causes before
disassembling the pump.
*See Related Manuals, page 2, for manual numbers.
Relieve the pressure, page 14, before checking or
servicing the equipment.
Problem Cause Solution
Pump output low on both strokes. Restricted air supply lines. Clear any obstructions; be sure all shutoff
valves are open; increase pressure, but do
not exceed maximum working pressure.
Exhausted fluid supply. Refill and reprime pump.
Clogged fluid outlet line, valves, etc. Clear.
Worn piston u-cup or v-packings. Replace. See Bellows Displacement Pump
manual.*
Pump output low on only one stroke. Held open or worn ball check valves. Check and repair. See Bellows Displace-
ment Pump manual.*
Worn piston u-cup or v-packings. Replace. See Bellows Displacement Pump
manual.*
No output. Improperly installed ball check valves. Check and repair. See Bellows Displace-
ment Pump manual.*
Pump operates erratically. Exhausted fluid supply. Refill and reprime pump.
Held open or worn ball check valves. Check and repair. See Bellows Displace-
ment Pump manual.*
Clogged suction tube or filter Clear part(s).
Worn piston u-cup or v-packings. Replace. See Bellows Displacement Pump
manual.*
Damaged bellows. Replace. See Bellows Displacement Pump
manual.*
Material visible in the overflow chamber
(if equipped) or weeping from port in
packing nut.
Damaged bellows. Replace. See Bellows Displacement Pump
manual.*
Pump will not operate. Restricted air supply lines. Clear any obstructions; be sure all shut off
valves are open; increase pressure, but do
not exceed maximum working pressure.
Exhausted fluid supply. Refill and reprime pump.
Clogged fluid outlet line, valves, etc. Clear.
Damaged air motor. See NXT Air Motor manual.*
Runaway solenoid has tripped. Retract solenoid. NXT Air Motor manual.*
