EN
Pump runs , with no output.
Loose connection in between pump
and siphon kit.
Stuck lower ball.
Check that all connections are tight.
Replace or clean the parts as
necessary.
MX412 & MXL412 BARE PUMP - TROUBLESHOOTING
Pump will not start
No compressed air.
Spray tip is blocked.
Check compressed air supply.
Clean or replace the spray tip.
PROBLEM CAUSE SOLUTION
Erratic operation of air motor,
air motor stops.
Worn poppet assemblies.
Worn or dirty spool and sleeve
assembly.
Replace the poppet assemblies.
Clean or replace the spool and
sleeve assembly, as necessary.
Continuous air leak from the
exhaust
Worn poppet assemblies.
Worn piston seal.
Worn diaphragm.
Replace poppet assemblies.
Replace piston seal.
Replace diaphragm.
Material in solvent cup. Worn or dirty upper packings.
Replace or clean upper packings as
necessary.
Pump does not stop on the
down stroke.
Worn or dirty lower ball check.
Replace or clean the parts as
necessary.
Pump does not stop on the up
stroke.
Worn or dirty upper ball check.
Worn or dirty lower packings.
Replace or clean the parts as
necessary.
Pump runs erratically
Blocked siphon kit.
Blocked inlet filter or strainer.
Low material level.
Replace or clean the siphon kit.
Replace or clean the inlet filter or
strainer.
Replace or refill material container.
77-3203-R3.1 9/36
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