© Titan Tool Inc. All rights reserved. 15
Problem
A. Pump delivers on upstroke
only or goes up slowly and
down fast (commonly called
down stroke dive.
B. Pump delivers on down stroke
only or goes up fast and down
slowly.
C. Pump moves up and down
fast, not delivering material.
D. Pump moves up and down
slowly when spray gun is shut
off.
E. Not enough uid pressure at
gun.
F. Pump chatters on up or down
stroke.
G. Motor stops at top or bottom
of stroke – air does not
exhaust when gun is open.
H. Motor stops, blows air from
exhaust when gun is open.
Cause
1. Lower foot valve ball is not seating due to
trash or wear.
2. Material too viscous to siphon.
3. Air leaking in on siphon side or damaged
siphon hose. Siphon may be too small for
heavy material.
4. Upper packing nut (if applicable) is loose
or upper packings are worn.
1. Upper ball is not seating due to trash or
wear.
2. Lower packing set is worn.
1. Material container is empty or material is
too thick to ow through siphon hose.
2. Bottom ball stuck to foot valve seat.
3. Siphon hose is kinked or loose.
1. Loose connections. Bleed valve is open
partially or bleed valve is worn. Lower
packing set is worn.
2. Upper and/or lower ball not seating.
1. Spray tip is worn.
2. Compressor (air operated units only) too
small. Outlet lter or gun lter is clogged.
3. Low voltage and/or inadequate amperage.
4. Hose size or length is too small or too long
1. Solvent has caused upper packing to
swell, or packing is too tight.
1. Piston rod is loose where it connects to the
uid section.
2. Trip springs or valve spring broken.
3. Motor is frozen due to icing or lack of
lubrication.
1. See above
2. Air valve is dead stall position.
3. O-rings are worn or damaged.
Solution
1. Remove foot valve assembly. Clean and inspect.
Test foot valve by lling with water. If ball fails to
seal the seat, replace the ball.
2. Thin material – contact manufacturer for proper
thinning procedures.
3. Tighten all connections between pump and paint
container. If damaged, replace. Switch to bigger
siphon set.
4. If tightening upper packing nut does not correct,
change upper packings.
1. Check upper seal and ball with water. If ball fails to
seal the seat, replace.
2. Replace packing kit if worn.
1. 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.
2. Remove foot valve. Clean ball and seat.
3. Straighten.
1. 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,
change lower packing.
2. Reseat balls by cleaning.
1. Replace.
2. Clean or replace lter. Recommend proper hose
size and/or air compressor size.
3. Check electrical service. Correct as required.
4. Increase hose size to minimize pressure drop though
hose and/or reduce hose lengths.
1. Back off upper packing nut 1/4 turn (if applicable)
and restart pump. Repeat if necessary.
1. Tighten connection.
2. Inspect and replace where necessary.
3. Add Air Motor Lubricant, AirCare™ (Part # 311-011)
to manual oiler. If condition persists, install moisture
separator and automatic lubricator.
1. See above.
2. Remove one trip spring retainer, trip spring and ball.
Push spool valve up or down, lubricate, reassemble
and restart.
3. Install minor service kit and follow instructions in
General Maintenance and Service section of manual.
4. If dust or dirt is found inside motor, check air supply
for contamination.
Troubleshooting
