Graco PT2500 Instructions Manual page 18

PROBLEM
Sprayer starts but will not suck paint
Sprayer sucks paint but does not
build up pressure
Sprayer sucks paint, builds pres-
sure, but pressure drops when gun sure but pressure drops when gun
is triggered
Pressure fluctuations
Paint in hydraulic system
Hydraulic oil in paint
CAUSE
Paint supply empty
Inlet screen clogged
Inlet valve stuck or damaged
Outlet valve stuck
Air trapped in hydraulic system
Hydraulic oil level low or empty
Wrong grade of hydraulic oil or
wrong fluid in hydraulic system
Inlet valve not tight
Damaged diaphragm
Pressure control valve not turned up
Outlet valve stuck, dirty or had worn
parts
Hydraulic oil low
Inlet valve leaks
Damaged diaphragm
Damaged bypass valve
Damaged hydraulic system
Damaged paint pump
No spray tip on gun
Spray tip orifice too large for the
paint or worn tip
Inlet screen clogged
Optional gun filter clogged
Optional gun filter screen too fine for
type of paint
Paint too thick
Worn outlet valve
Leaking bypass valve
Worn or damaged inlet valve
Worn or damaged pressure control
valve
Outlet valve stuck, dirty or worn
Leaking or dirty bypass valve
Dirty, leaking, worn or damaged
inlet valve
Dirty pressure control knob
Damaged diaphragm, or paint
pump, or hydraulic system
Ruptured diaphragm
Ruptured diaphragm
SOLUTION
Refill and prime pump
Clean
See page 19.
See page 19.
See page 19, Diaphragm, step 9
See page 14.
Use only Graco approved hydraulic
oil, part no. 218–797
Tighten; see page 14.
Replace; see page 19.
Adjust
See page 19.
See page 14.
See page 19.
Replace; see page 19.
Replace.
Return sprayer for repair.
Replace.
Shut off sprayer and install tip
Try a smaller tip or a new tip
Clean
Clean or replace
Install larger mesh filter or strain and
thin the paint
Thin and/or strain
Replace; see page 19.
Replace.
See page 19.
See page 19.
See page 19.
Replace.
Replace; see page 19.
Clean or replace; see page 19.
Return for repair.
Return for repair.
Return for repair.