© Titan Tool Inc. All rights reserved. 15
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.
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.
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.
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.
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.
Replace packings.
