Graco PT2500 - Manual (Page 17)

820-133 17
PROBLEM CAUSE SOLUTION
Sprayer starts but will not suck paint Paint supply empty Refill and prime pump
Inlet screen clogged Clean
Inlet valve stuck or damaged See page 18
Outlet valve stuck See page 18
Air trapped in hydraulic system See page 18, Diaphragm, step 9
Hydraulic oil level low or empty See page 14
Wrong grade of hydraulic oil or
wrong fluid in hydraulic system Use only Graco approved hydraulic
oil, part no. 218–797
Inlet valve not tight Tighten; see page 14
Damaged diaphragm Replace; see page 18
Sprayer sucks paint but does not
build up pressure Pressure control valve not turned up Adjust
Outlet valve stuck, dirty or had worn
parts See page 18
Hydraulic oil low See page 14
Inlet valve leaks See page 18
Damaged diaphragm Replace; see page 18
Damaged bypass valve Replace
Damaged hydraulic system Return sprayer for repair
Damaged paint pump Replace
Sprayer sucks paint, builds pres-
sure but pressure drops when gun No spray tip on gun Shut off sprayer and install tip
sure, but pressure drops when gun
is triggered
Spray tip orifice too large for the
paint or worn tip Try a smaller tip or a new tip
Inlet screen clogged Clean
Optional gun filter clogged Clean or replace
Optional gun filter screen too fine for
type of paint Install larger mesh filter or strain and
thin the paint
Paint too thick Thin and/or strain
Worn outlet valve Replace; see page 18
Leaking bypass valve Replace
Worn or damaged inlet valve See page 18
Worn or damaged pressure control
valve See page 18
Pressure fluctuations Outlet valve stuck, dirty or worn See page 18
Leaking or dirty bypass valve Replace
Dirty, leaking, worn or damaged
inlet valve Replace; see page 18
Dirty pressure control knob Clean or replace; see page 18
Damaged diaphragm, or paint
pump, or hydraulic system Return for repair
Paint in hydraulic system Ruptured diaphragm Return for repair
Hydraulic oil in paint Ruptured diaphragm Return for repair