SYMPTOM
APPEARANCE OF DEFECT
No flow through
Spray material pressure drops
Comet 4/12 Pump
Pump does not start.
Reduction of spray
pattern
Erratic operation,
Faulty air motor piston valve.
number of strokes
reduced, pneumatic
drive stops
Pneumatic drive
frozen up.
Material coming
Material on the rod and/or in
the upper fluid seal housing.
up from the fluid
section.
Pump runs
Pump runs even when gun is not
triggered.
non-stop.
Pump does not
Upper or lower ball check is
faulty or stuck.
stop on the down
stroke.
Pump does not
Upper or lower ball check is
faulty or stuck.
stop on the up
stroke.
Pump runs
Suction screen blocked.
erratically.
Pump runs, but
No suction power.
there is no flow.
TROUBLESHOOTING: Binks 4/12 BARE PUMP
PROBABLE CAUSE
No compressed air.
Kinked hoses.
Spray tip is blocked.
Kinked hose(s).
Air control is blocked.
Wear.
Foreign matter in the control
system.
Compressed air too damp.
Condensation in the air supply.
Too many strokes.
Upper u-cup is faulty.
Lower u-cup is faulty.
Worn ball checks and seats.
Dried material.
Worn ball checks and seats.
Dried material.
Debris in spray material.
Inlet strainer dirty.
Suction hoses/fittings not
properly tightened.
Lower ball is stuck.
REMEDY
Check compressed air supply.
Check hoses.
Clean or replace the spray tip.
Check hoses.
Clean the air control.
Filter the compressed air.
Replace parts.
Remove foreign matter, replace
faulty parts.
Install an extractor/coalescer unit.
Check compressor
Use smaller spray nozzle.
Modify working conditions.
Install oiler.
Reduce air pressure.
Replace the upper u-cup.
Replace the lower u-cup.
Replace parts.
Careful cleaning necessary.
Replace parts.
Careful cleaning necessary.
Clean or replace suction screen.
Clean or replace.
Tighten.
Clean or replace parts.
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