Graco 241407 Instructions-Parts List Manual page 12

Read Pressure Relief Procedure on page 10, and relieve the pressure before you check or
service the equipment. Check all possible problems and causes before disassembling the pump.
PROBLEM
Pump will not cycle, or cycles
once and stops.
Pump cycles at stall or fails to
hold pressure at stall.
Pump operates erratically.
Air bubbles in fluid.
Fluid in exhaust air.
Pump exhausts air from clamps
(metal pumps).
Pump leaks fluid from check
valves.
12 308797
Troubleshooting
CAUSE
Air valve is stuck or dirty.
Leaky check valves or o-rings.
Worn check balls or duckbill valves
or guides.
Check ball wedged in guide.
Worn diaphragm shaft seals.
Clogged suction line.
Sticky or leaking check valve balls.
Diaphragm ruptured.
Suction line is loose.
Diaphragm ruptured.
Loose manifolds or damaged
manifold o-rings.
Loose fluid side diaphragm plates.
Diaphragm ruptured.
Loose fluid side diaphragm plates.
Worn diaphragm shaft seals.
Loose clamps.
Air valve o-ring is damaged.
Worn or damaged check valve
o-rings.
SOLUTION
Use filtered air.
Replace.
Replace.
Repair or replace.
Replace.
Inspect; clear.
Clean or replace.
Replace.
Tighten.
Replace.
Tighten manifold bolts or nuts;
replace o-rings.
Tighten.
Replace.
Tighten.
Replace.
Tighten clamp nuts.
Inspect; replace.
Inspect; replace.