Graco GH 200, Operation

19

309581

Troubleshooting

To reduce risk of serious injury, when instructed to relieve pressure, do steps 1. – 3.; page 14.

PROBLEM

CAUSE

SOLUTION

Gas engine pulls hard (won’t start)

Hydraulic pressure is too high

Turn hydraulic pressure knob counterclockwise
to lowest setting

Gas engine does not start

Switch OFF, low oil, no gasoline

Consult engine manual, supplied

Gas engine doesn’t work properly

Consult engine manual, supplied

Gas engine operates, but displace-
ment pump doesn’t operate

Pump valve is OFF

Set pump valve ON

Pressure setting too low

Increase pressure, page 10

Displacement pump outlet filter (if
used) is dirty or clogged

Clean the filter

Tip or tip filter (if used) is clogged

Remove tip and/or filter and clean

Hydraulic fluid too low

Shut off sprayer. Add fluid*. See page 7.

Belt worn or broken

Replace. See manual 310548.

Hydraulic pump worn or damaged

Bring sprayer to Graco distributor for repair

Dried paint seized paint pump rod

Service pump. See manual 309277.

Hydraulic motor not shifting

Set pump valve OFF. Turn pressure down.
Turn engine OFF. Pry rod up or down until hy-
draulic motor shifts. Manual 310548.

Displacement pump operates, but
output is low on upstroke

Piston ball check not seating properly.

Service piston ball check. See manual 309277.

Replace packings. See manual 309277.

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.

Suction tube air leak

Tighten packing nut or replace packings. See
manual 309277.

Service intake valve ball check. See manual
309277.

Tighten suction tube

Paint leaks and runs over side of
wetcup

Loose wet–cup

Throat packings worn or damaged

Tighten packing nut enough to stop leakage

Replace packings. See manual 309277.

Excessive leakage around hydraulic
motor piston rod wiper

Piston rod seal worn or damaged

Replace these parts. See manual 310548.

Fluid delivery is low

Pressure setting too low

Displacement pump outlet filter (if
used) is dirty or clogged

Intake line to pump inlet is not tight

Hydraulic motor is worn or damaged

Large pressure drop in fluid hose

Increase pressure, page 10

Clean filter

Tighten

Bring sprayer to Graco distributor for repair

Use larger diameter or shorter hose

The sprayer overheats

Paint buildup on hydraulic components

Clean

Oil level is low

Fill with oil. See page 7.

Spitting from gun

Air in fluid pump or hose

Check for loose connections on siphon assem-
bly, tighten, then reprime pump

Loose intake suction

Tighten

Fluid supply is low or empty

Refill supply container

Excessive hydraulic pump noise

Low hydraulic fluid level

Shut off sprayer. Add fluid*. See page 7.

*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid, page 7.