18
307132
Troubleshooting Chart
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.
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.
NOTE:
Check everything in the troubleshooting chart before disassembling the pump.
PROBLEM
CAUSE
SOLUTION
System won’t run or stops
Air pressure or volume too low.
Increase, check air compressor.
Closed or restricted air line or air
valve.
Open or clean as required.
Fluid valves closed.
Open fluid valves.
Clogged fluid hose.
Replace fluid hose.
Air motor worn or damaged.
Service air motor – see instruc-
tion manual 307049.
Displacement pump seized.
Service lower pump – see
instruction manual 307944.
System speeds up or runs erratically
Fluid containers are empty.**
Check often – keep filled.
Air in fluid lines.**
Purge, check connections.
Displacement pump parts worn or
damaged.
Service air motor – see instruc-
tion manual 307944.
Pump operates but part A output pres-
sure drops during upstroke.*
Dirty, worn or damaged part A pump
piston valve.
Clean, service – see instruction
manual 307944.
Worn or damaged part A pump piston
packings.
Replace.
Pump operates but part A output pres-
sure drops during downstroke.*
Dirty, worn or damaged part A pump
intake valve.
Clean, service – see instruction
manual 307944.
Fluid not filling cylinder on upstroke,
“diving” on top of change–over.
Increase pressure on feed
pump. Check inlet filter screen.
Check foot valve.
Pump operates but part A output pres-
sure drops during both strokes.*
Dirty, worn or damaged part A pump
piston valve.
Clean, service – see instruction
manual 307944.
Fluid supply low.**
Refill or change container.
Summary of Contents for BULLDOG HYDRA-CAT 208958
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