Graco 218-501, Instructions-Parts List Manual

Page: 18 / 24

18
307-711
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 19.
Outlet valve stuck See page 19.
Air trapped in hydraulic system See page 19, 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 19.
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 19.
Hydraulic oil low See page 14.
Inlet valve leaks See page 19.
Damaged diaphragm Replace; see page 19.
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 19.
Leaking bypass valve Replace.
Worn or damaged inlet valve See page 19.
Worn or damaged pressure control
valve See page 19.
Pressure fluctuations Outlet valve stuck, dirty or worn See page 19.
Leaking or dirty bypass valve Replace.
Dirty, leaking, worn or damaged
inlet valve Replace; see page 19.
Dirty pressure control knob Clean or replace; see page 19.
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.