Graco 309868D User Manual
Troubleshooting
309868D
7
Troubleshooting
Check all other possible problems and solutions
before disassembling the pump. Before you trouble-
shoot problems using the table below, relieve the
pressure and disconnect the pump fluid line. If the
pump starts when the air is turned on again, the
fluid line, dispensing valve, etc., is clogged.
before disassembling the pump. Before you trouble-
shoot problems using the table below, relieve the
pressure and disconnect the pump fluid line. If the
pump starts when the air is turned on again, the
fluid line, dispensing valve, etc., is clogged.
Problem
Cause
Solution
Pump fails to operate
Inadequate air supply pressure or
restricted air lines
restricted air lines
Increase air supply; clear
Closed or clogged dispensing valve
Open; clear
Clogged fluid lines, hoses, valve, etc.
Clear
Damaged air motor
Service air motor
Exhausted fluid supply
Refill and reprime or flush
Continuous air exhaust
Worn or damaged air motor gasket,
packing, seal, etc.
packing, seal, etc.
Service air motor
Erratic pump operation
Exhausted fluid supply
Refill and reprime or flush
Pump operates, but output low
on down stroke
on down stroke
Held open or worn intake valve or pis-
ton packings
ton packings
Clear; service
Pump operates, but output low
on up stroke
on up stroke
Held open or worn piston ball or piston
packings
packings
Clear; service
Pump operates, but output low
on both strokes
on both strokes
Inadequate air supply pressure or
restricted air lines
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