PROBLEM
Pump will not start
Erratic operation of air motor,
air motor stops
Continuous air leak from the
exhaust
Material in solvent cup
Pump does not stop on the
down stroke
Pump does not stop on the up
stroke
Pump runs erratically
Pump runs, with no output
ITEM
NO.
NUMBER
1
72-2354
2
101-2050
3
20-4854
4
5
71-4885
77-2973-R3.0 (7/2017)
BARE PUMP ASSEMBLIES – TROUBLESHOOTING
CAUSE
No compressed air.
Spray tip is blocked.
Worn poppet assemblies.
Worn or dirty spool and sleeve assembly.
Worn poppet assemblies.
Worn piston seal.
Worn diaphragm.
Worn or dirty upper packings.
Worn or dirty lower ball check.
Worn or dirty upper ball check.Worn or
dirty lower packings.
Blocked siphon kit.
Blocked inlet filter or strainer.
Low material level.
Loose connection in between pump and
siphon kit.
Stuck lower ball.
41-28380 FLUID CONTROL VALVE ASSEMBLY
PARTS LIST
PART
DESCRIPTION
BALL VALVE
TEE, 1/4 NPT(f)
DM NIPPLE, 1/4 NPT
72-790
DM NIPPLE, 1/4 NPT X 1/4 NPS
DRAIN/RELIEF HOSE ASS'Y, 5 FT
Check compressed air supply.
Clean or replace the spray tip.
Replace the poppet assemblies.
Clean or replace the spool and sleeve assembly, as
necessary.
Replace poppet assemblies.
Replace piston seal.
Replace diaphragm.
Replace or clean upper packings as necessary.
Replace or clean the parts as necessary.
Replace or clean the parts as necessary.
Replace or clean the siphon kit.
Replace or clean the inlet filter or strainer.
Replace or refill material container.
Check that all connections are tight.
Replace or clean the parts as necessary.
QTY
2
1
3
1
1
9 / 20
SOLUTION
1
3
2
3
3
1
4
5
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