TROUBLESHOOTING
Pressure
Relief Procedure
To reduce the risk of serious bodily injury , including
fluid
injection, splashing fluid or solvent in the eyes or
on the skin, or injury from moving parts or electric
shock,
follow this procedure whenever you shut of
f the
sprayer,
check or service any part of the spray system,
install,
clean or change spray tips, and whenever
you
stop
spraying.
1.
Engage the gun safety latch.
2.
Open the bypass valve.
3.
Depress the engine stop button.
4.
Close the fuel shutof
f valve.
5. Disengage
the gun safety
latch. Hold a metal part
of the gun firmly to the side of a grounded metal
pail,
and trigger the gun to relieve pressure.
6.
Engage the gun safety latch.
7. Open
the pressure drain valve, having a container
ready to catch the drainage. Leave the valve open
until
you are ready to spray again.
If
you suspect that the spray tip or hose is completely
clogged,
or that
pressure has not been fully relieved af
-
ter
following the
steps above,
VER
Y SLOWL
Y loosen
the tip retaining nut or hose coupling to relieve pres-
sure
gradually
, then loosen completely
.
Now clear the
tip
or hose.
WARNING
Check everything in the T
roubleshooting Chart before disassembling the sprayer
.
PROBLEM CAUSE SOLUTION
Gas
engine doesn’t work properly
.
Consult engine manual, supplied.
Gas engine operates, but
displacement pump doesn’t
operate.
Hydraulic motor stalled.
Pressure setting too low
.
Displacement pump outlet filter (if
used) is dirty or clogged.
T
ip or tip filter (if used) is clogged.
Hydraulic fluid too low
.
Hydraulic pump worn or damaged.
Hydraulic motor worn or damaged.
Displacement pump rod seized by
dried paint.
Depress the engine stop button. Firmly press
straight down on motor reset button. Restart
sprayer
, see page 8. If it doesn’t start, see
manual 307–158.
Increase pressure. See page 9.
Clean the filter
.
Remove tip and/or filter and clean.
Shut of
f sprayer
and add fluid immediately*. See
page 5.
Return sprayer for repair
.
Return sprayer for repair
.
Service pump. See manual .
Displacement pump operates, but
output is low on upstroke.
Piston ball check not seating properly
.
Piston packings worn or damaged.
Service piston ball check. See manual 307–862
.
Replace packings. See manual
Displacement pump operates but
output is low on downstroke and/
or on both strokes.
Piston packings worn or damaged.
Intake valve ball check not seating
properly.
Replace packings. See manual 307–862
Service intake valve ball check. See manual
307–862.
Paint leaks into wetcup
Loose wet–cup
Throat packings worn or damaged.
T
ighten just enough to stop leakage.
Replace packings. See manual 307–862
Excessive leakage around
hydraulic motor piston rod wiper
.
Piston rod seal worn or damaged.
Replace these parts. See manual 307–158.
Fluid delivery is low
.
Pressure setting too low
.
Displacement pump outlet filter (if
used) is dirty or clogged.
Hydraulic pump is worn or damaged.
Hydraulic motor is worn or damaged.
Large pressure drop in fluid hose.
Increase pressure. See page 9.
Clean filter
Return sprayer for repair
.
Return sprayer for repair
.
Use larger diameter hose.
The sprayer overheats.
Cooler or blower is worn or damaged.
Replace. See page 13.
Spitting from gun.
Air in fluid pump or hose.
Fluid supply is low or empty
.
Check for loose connections on siphon
assembly
, tighten, then reprime pump.
Refill supply container
.
*Check
hydraulic fluid level often. Do not allow it to become too low
. Use only Graco approved hydraulic fluid. See pages
5 and 20.
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