EN
77-2918-R4.5 (3/2017)
7 / 10
MX1231 BARE PUMP ASSEMBLIES – TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
Pump will not start
No compressed air.
Spray tip is blocked.
Check compressed air supply.
Clean or replace the spray tip.
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.
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.
