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Troubleshooting
16 3A1570A
Fluid pressure low or dropping Air supply pressure low when spray-
ing
Increase inlet air pressure
Increase air compressor size to meet
flow requirements
Remove airline quick disconnects
Use 3/8 in. (0.95 cm) ID or larger air
supply hose. Use 1/2 in. (12.7 mm) if
longer than 25 ft (7.6 m).
Icing in air motor exhausts or mufflers Check inlet filter water separator; see
page 25. Stop spraying while ice
melts.
Pump output low, but pressure is nor-
mal
Obstructed gun impingement ports or
filters
Flush and clean gun; see gun manual
One pressure gauge drops when
pumps are stalled on both the
upstroke and the downstroke
Leaking pump throat Repair pump; see 309577
Leak between pump and gun Check fluid tubes, heater, and hoses
Pressure Relief/Spray valve leaking
back to supply
Spray gun is leaking on one side or
plugged on the other side
Clean and repair spray gun
One pressure gauge drops when
pumps are stalled on the downstroke,
but not the upstroke
Inlet ball check not sealing Clean or replace; see 309577
Inlet check seat o-ring not sealing Repair pump; see 309577
One pressure gauge drops when
pumps are stalled on the upstroke,
but not the downstroke
Piston check ball not sealing Repair pump; see 309577
Piston packing not sealing Repair pump; see 309577
Loose piston stud in pump Repair pump; see 309577
Bad inside sleeve seal Repair o-ring; see 309577
A side rich; lack of B side A side gauge is low B side restriction downstream of
gauge. Check gun check valve
screen, mix module, or mix manifold
restrictor.
A side impingement port is worn.
B side gauge is low B side material supply problem.
Check B side inlet strainer and pump
intake valve.
B side rich; lack of A side A side gauge is low A side material supply problem.
Check A side inlet strainer and pump
intake valve.
B side gauge is low A side restriction downstream of
gauge. Check gun check valve
screen, mix module, or mix manifold
restrictor.
B side impingement port is worn.
PROBLEM CAUSE SOLUTION