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Troubleshooting
Problem
Pump does not run
Pump speeds up or runs erratically
Pump slows down or runs erratically The air motor is icing
Pump runs, but output is low on the
up or on the down stroke.
Pump runs, but output is low on
both strokes
3A9292B
Follow Pressure Relief Procedure, page 7, before
checking or repairing the system.
NOTE: Check all possible problems and causes before
disassembling pump.
Cause
There is no fluid demand
Air supply is insufficient
Fluid outlet line or intake valve is
clogged
Air motor parts are worn or
damaged
Material viscosity is too high
Pump throat packings, piston or
piston packings, or intake valve is
worn
The pump piston or the intake valve
is worn
Insufficient air supply
Fluid outlet line, intake valve, or
dispense valve is clogged
Troubleshooting
Solution
In a closed end system, the pump
runs only when there is a demand
for fluid.
Check the air supply.
Increase the air pressure or volume.
Check and clear any obstacles.
Check the piston o-rings (3b, 3c)
and the exhaust plate (3a) for
swelling, replace parts as needed.
See Repair, staring on page 10.
Check the piston assembly (3) to
make sure the screws are properly
torqued to 10 to 14 in-lb (1.3 to 1.6
N•m), and that the assembly is
hand-tightened on the piston shaft
(6).
Check the springs (2,5) for wear or
damage, replace as needed.
Reduce viscosity.
Reduce pump speed when running
viscous materials.
Check parts and repair as needed.
See Repair, starting on page 10.
Turn off pump and allow to warm
up.
Run the pump at a lower air
pressure.
Check parts and repair as needed.
See Repair, starting on page 10.
Check the air supply and increase
air pressure or volume.
Check parts and repair as needed.
9
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