© Titan Tool Inc. All rights reserved. 11
Troubleshooting - Air Motor
Condition Possible Cause Correction
A. Motor stops at top or bottom of
stroke - air does not exhaust when
gun is open.
Piston rod is loose where it connects to the
uid section.
Trip springs or valve spring broken.
Motor is frozen due to icing or lack of
lubrication.
Tighten connection.
Inspect and replace where neessary.
Add 30 weight nondetergent oil to manual
oiler. If condition persists, install moisture
separator and automatic lubricator.
B. Motor stops, blows air from exhaust
when gun is open.
See above.
Air valve is in dead stall position.
O-rings were worn or damaged.
See above.
Remove one trip spring retainer, trip spring
and ball. Push spool valve up or down,
lubricate, reassemble and restart.
Install minor service kit and follow
instructions in General Maintenance and
Service section of manual.
If dust or dirt is found inside motor, check
air supply for contamination.
Troubleshooting - Fluid Sections
Condition Possible Cause Correction
A. Pump delivers on upstroke only
or goes up slowly and down fast
(commonly called downstroke dive).
Lower foot valve ball is not seating due to
trash or wear.
Material to viscous to siphon.
Air leaking in on siphon side or damaged
siphon hose. Siphon may be too small for
heavy material.
Upper packing nut (if applicable) is loose
or upper packings are worn.
Remove foot valve assembly. Clean and
inspect. Test foot valve by lling with
water. If ball fails to seal the seat, replace
ball.
Thin material - contact manufacturer for
proper thinning procedures.
Tighten all connections between pump
and paint container. If damaged, replace.
Switch to bigger siphon set.
If tightening upper packing nut does not
correct, change upper packings.
B. Pump delivers on down stroke only
or goes up fast and down slowly.
Upper ball is not seating due to trash or
wear.
Lower packing set is worn.
Check upper seat and ball with water. If
ball fails to seal seat, replace.
Replace packing set is worn.
C. Pump moves up and down fast, not
delivering material.
Material container is empty or material is
too thick to ow through the siphon hose.
Bottom ball stuck to foot valve seat.
Siphon hose is kinked or loose.
Rell with new material. If too thick,
remove siphon hose and immerse pump or
add thinner to material. Change to bigger
siphon set. Open bleed valve to remove air
and restart pump.
Remove foot valve. Clean ball and seat.
Straighten.
D. Pump moves up and down slowly
when spray gun is shut off.
Loose connections. Bleed valve is open
partially or bleed valve is worn. Lower
packing set is worn.
Upper and/or lower ball not seating.
Check all connections between pump and
gun. Tighten as necessary. If material is
owing from bleed hose, close bleed valve
or replace if necessary. Should none of
above be evident, replace lower packing.
Reset balls by cleaning.
E. Not enough uid pressure at gun. Spray tip is worn.
Compressor (air operated units only) too
small. Outlet lter or gun lter is clogged.
Low voltage and/or inadequate amperage.
Hose size or length is too small or too
long.
Replace.
Clean or replace lter. Recommend proper
hose size and/or air compressor size.
Check electrical service. Correct as required.
Increase hose size to minimize pressure
drop through hose and/or reduce hose
lengths.
F. Pump chatters on up or down stroke Solvent has caused upper packing to
swell, or packing is too tight.
Back off upper packing nut 1/4 turn (if
applicable) and restart pump. Repeat if
necessary.
