Troubleshooting
8
307906ZAA
Troubleshooting
Problem
Cause
Solution
Pump does not run.
There is no fluid demand.
In a closed-end system, the pump
runs only when there is demand for
fluid.
Air supply is insufficient.
Check air supply. Increase air
pressure or volume.
Fluid outlet line or intake valve is
clogged.
Relieve the pressure,
page 7
.
Check and clear obstacles.
Air motor parts are worn or
damaged.
Check the piston o-rings (15a*,
15b*) and exhaust plate (15c*) for
swelling. Replace if necessary. See
Service instructions beginning on
page 9.
Check the piston assembly (15). Be
sure its screws are properly torqued
(10 to 14 in-lb [1.3 to 1.6 N•m]) and
that the assembly is hand-tightened
onto the piston rod.
Check the springs (8, 17) for wear or
damage and replace as needed.
Pump speeds up or runs erratically.
Material viscosity is too high.
Reduce viscosity. Reduce pump
speed when running viscous
materials.
Pump throat packings, piston or
piston packings, or intake valve is
worn.
Relieve the pressure,
page 7.
Check and repair. See Service
instructions beginning on page 9.
Pump slows down or runs erratically.
Air motor is icing.
Shut off pump and allow to warm up.
Run pump at a lower air pressure.
Pump runs, but output is low on up
or down stroke.
Pump piston and/or intake valve is
worn.
Relieve the pressure,
page 7.
Check and repair. See Service
instructions beginning on page 9.
Pump runs, but output is low on both
strokes.
Air supply is insufficient.
Check air supply. Increase air
pressure or volume.
Fluid outlet line, intake valve, or
dispense valve is clogged.
Relieve the pressure,
page 7.
Check and repair.
