Troubleshooting guide

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Operation
NOTE: The low level cut-of f valve accessory (K)
closes the pump fluid intake when the fluid level is low ,
causing the pump to stall, to avoid running dry .
A pump runaway valve (D) can be installed on the air
line of pumps not equipped with a low level cut-of f
valve, to automatically shut of f the pump if it starts to
run too fast.
6. Read and follow the instructions supplied with
each component in your system.
7. If the pump will be unattended for any period of
time, or to shut of f the system at the end of the
work shift, always follow the Pressure Relief Pro -
cedure
on page 9.
Troubleshooting
NOTE: Check all other possible problems and solutions before disassembling the pump.
Problem Cause Solution
Pump fails to operate Inadequate air supply pressure or
restricted air lines
Increase air supply; clear
Closed or clogged dispensing
valve
Open; clear
Clogged fluid lines, hoses, valves,
etc.
Clear*
Damaged air motor Service air motor
Exhausted fluid supply Refill and reprime or flush
Continuous air exhaust W orn or damaged air motor gas -
ket, packing, seal, etc.
Service air motor
Erratic pump operation Exhausted fluid supply Refill and reprime or flush
Held open or worn intake valve or
piston packings
Clear; service
Pump operates, but output low on
up stroke
Held open or worn piston packings Clear; service
Pump operates, but output low on
down stroke
Held open or worn intake valve Clear; service
Pump operates, but output low on
both strokes
Inadequate air supply pressure or
restricted air lines
Increase air supply; clear
Closed or clogged valves Open; clean
Exhausted fluid supply Refill and reprime or flush
Clogged fluid lines, hoses, valves,
etc.
Clear*
*Follow the Pressure Relief Procedure on page 9 and disconnect the fluid line. If the pump starts when the air is
turned on again, the line, etc., is clogged.