Troubleshooting
18
3A7931B
Troubleshooting
1. Follow the
, on page
12, before checking or repairing the system.
2. Check all possible problems and causes before
disassembling system.
* To determine if the fluid hose or gun is obstructed, follow the
on page 12. Disconnect
the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air just enough to start
the pump (about 20-40 psi [0.14–0.28 MPa, 1.4–2.8 bar]). If the pump starts when the air is turned on, the
obstruction is in the fluid hose or dispensing device.
Problem
Cause
Solution
Pump fails to operate.
Restricted line or inadequate air
supply; closed or clogged valves.
Clear; increase air supply. Ensure
that all valves are open.
Obstructed fluid hose or gun/valve;
fluid hose ID is too small.
Open and clear*; use a hose with a
larger ID.
Fluid dried on displacement rod.
Clean. Always stop pump at the bot-
tom of the stroke. Keep enclosed
wet cup 1/3 filled with a compatible
solvent.
Dirty, worn, or damaged motor
parts.
Clean or repair; see separate motor
manual.
Pump operates, but output is low.
Fluid is too heavy for pump priming
Use drain/purge valve; use a ram.
Intake valve is held open or worn or
seals are worn.
Clear valve; replace seals.
Erratic or accelerated pump.
Exhausted fluid supply.
Refill and prime.
Fluid is too heavy for pump priming.
Use drain/purge valve.
Intake valve is held open or worn or
seals are worn.
Clear valve; replace seals.
Priming piston is held open or worn.
Clear; service.
Packings in displacement pump are
worn.
Replace packings.
