6.0 TROUBLE SHOOTING
Problem
Cause
Recommended Solutions
Pump does not move
Air motor stalled
Remove and then reattach the quick
disconnect fitting to re-start the air motor.
Fluid section seized
Make sure the pump has no air or liquid
pressure. Remove air cylinder and cap from
air motor. See if the piston rod can move
up/down or turn. If yes, check for full stroke
ability. If piston rod does not move at all, the
fluid section is seized.
Low air supply
A) Increase air supply
B) Open air ball valve
C) Close bleed valve
Air leak along piston
shaft.
Worn packing in fluid section. Replace packing
Check O-ring, replace if necessary. Also
check the rubber seal to see if it has come
apart from the air exhaust valve plate.
Air leaks from piston
shaft holes.
Contamination by debris in
the air motor piston.
Slow operations (Air
Motor)
Icing of the air motor.
Clogged muffler.
Allow ice built up on the air motor to thaw.
Clean or replace the muffler.
Low output both
stokes
Restricted fluid hoses.
Bad fluid seal in the foot
valve or defective piston cup.
Clean, clear or replace hoses.
Replace ball and/or piston cup in fluid
section.
Low output on up
stroke
Bad or damaged piston cup.
Replace piston cup in the fluid section.
Low output on down
stroke
Bad or damaged foot valve or
ball.
Replace foot valve ball in the fluid section.
Leaking fluid through
the packing at air
motor base.
Packing damaged or not
seated properly.
Packing nut too loose.
Scored or scratched
displacement rod.
Replace packing in the fluid section.
Tighten packing nut
Replace displacement rod.
Abnormal or rapid
operation.
Low or no fluid supply.
Broken spring(s) in air motor.
Replenish fluid supply and re-prime the
pump.
Replace springs in the air motor.
Jerky movement of
the pump
Packing nut in fluid section
too tight.
Stop pump operation. Relieve fluid pressure
from drain valve. Loosen packing nut and re-
tighten snugly.
