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WARNING
To reduce the risk of serious injury, al-
ways follow the Pressure Relief Proce-
dure on page 10 whenever you shut off,
check or service any part of the system, install or
change spray tips, or stop spraying/dispensing.
NOTE: Check everything in the troubleshooting chart before disassembling the pump.
PROBLEM
System won't run or stops
System speeds up or runs erratically
Pump operates but part A output pres-
sure drops during upstroke.*
Pump operates but part A output pres-
sure drops during downstroke.*
Pump operates but part A output pres-
sure drops during both strokes.*
18
307132
Troubleshooting Chart
CAUSE
Air pressure or volume too low.
Closed or restricted air line or air
valve.
Fluid valves closed.
Clogged fluid hose.
Air motor worn or damaged.
Displacement pump seized.
Fluid containers are empty.**
Air in fluid lines.**
Displacement pump parts worn or
damaged.
Dirty, worn or damaged part A pump
piston valve.
Worn or damaged part A pump piston
packings.
Dirty, worn or damaged part A pump
intake valve.
Fluid not filling cylinder on upstroke,
"diving" on top of change–over.
Dirty, worn or damaged part A pump
piston valve.
Fluid supply low.**
WARNING
Never operate the pump with the air mo-
tor shield removed, to reduce the risk of
serious injury, including amputation, from
moving parts inside the air motor housing.
SOLUTION
Increase, check air compressor.
Open or clean as required.
Open fluid valves.
Replace fluid hose.
Service air motor – see instruc-
tion manual 307049.
Service lower pump – see
instruction manual 307944.
Check often – keep filled.
Purge, check connections.
Service air motor – see instruc-
tion manual 307944.
Clean, service – see instruction
manual 307944.
Replace.
Clean, service – see instruction
manual 307944.
Increase pressure on feed
pump. Check inlet filter screen.
Check foot valve.
Clean, service – see instruction
manual 307944.
Refill or change container.
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