Uniden GH 200 Manuel D’Utilisation

Gas engine pulls hard (won't start)

Hydraulic pressure is too high

Turn hydraulic pressure knob counter clock-
wise to lowest setting.

Gas engine does not start

Switch OFF, low oil, no gasoline

Consult engine manual, supplied.

Gas engine doesn't work properly

Faulty engine

Consult engine manual, supplied.

Elevation

Refer to Engine Repair Kit. 
4.0 hp - 288678 / 5.5 hp - 248943 / 
6/5 hp - 248944 / 9.0 hp - 248945

Gas engine operates, but displacement 
pump doesn't operate

Hydraulic pump valve is OFF

Set hydraulic pump valve ON.

Pressure setting too low

Increase pressure.

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*.

Belt worn or broken or off

Replace, page 12.

Hydraulic pump worn or damaged

Bring sprayer to Graco distributor for repair.

Dried paint seized paint pump rod

Service pump. See manual 311845.

Hydraulic motor not shifting

Set pump valve OFF. Turn pressure down. 
Turn engine OFF. Pry rod up or down until 
hydraulic motor shifts .

Displacement pump operates, but output 
is low on upstroke

Piston ball check not seating properly

Service piston ball check. See manual 
311845.

Piston packings worn or damaged

Replace packings. See manual 311845.

Displacement pump operates but output 
is low on downstroke and/or on both 
strokes

Piston packings worn or damaged

Tighten packing nut or replace packings. 
See manual 311845.

Intake valve ball check not seating 
properly

Service intake valve ball check. See man-
ual 311845.

Suction tube air leak

Paint leaks and runs over side of wetcup

Loosen wet-cup

Tighten wet-cup enough to stop leakage.

Throat packings worn or damaged

Replace packings. See manual 311845.

Excessive leakage around hydraulic 
motor piston rod wiper

Piston rod seal worn or damaged

Replace these parts. 

Fluid delivery is low

Pressure setting too low

Increase pressure.

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

Clean filter.

Intake line to pump inlet is not tight

Tighten.

Hydraulic motor is worn or damaged

Bring sprayer to Graco distributor for repair.

Large pressure drop in fluid hose

Use larger diameter or shorter hose.

The sprayer overheats

Paint builup on hydraulic components

Clean.

Spitting from gun

Air in fluid pump or hose

Check for loose connections on siphon 
assembly, 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

Turn sprayer OFF. Add fluid*. 

Electric motor does not operate

Power switch is not ON

Turn power switch to ON.

Tripped circuit breaker

Check circuit breaker at power source. 
Reset motor switch.

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