Hitachi GH 300 important safety instructions Troubleshooting, Problem Cause Solution

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Troubleshooting

Troubleshooting

PROBLEM

CAUSE

SOLUTION

 

 

 

 

 

 

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

Hydraulic pump valve is OFF

Set hydraulic pump valve ON.

pump doesn't operate

 

 

Pressure setting too low

Increase pressure.

 

Displacement pump outlet filter (if used)

Clean the filter.

 

is dirty or clogged

 

 

 

 

 

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

Piston ball check not seating properly

Service piston ball check. See manual

is low on upstroke

 

311845.

 

 

 

 

Piston packings worn or damaged

Replace packings. See manual 311845.

Displacement pump operates but output

Piston packings worn or damaged

Tighten packing nut or replace packings.

is low on downstroke and/or on both

 

See manual 311845.

strokes

 

 

Intake valve ball check not seating

Service intake valve ball check. See man-

 

properly

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

Piston rod seal worn or damaged

Replace these parts.

motor piston rod wiper

 

 

 

 

 

Fluid delivery is low

Pressure setting too low

Increase pressure.

 

Displacement pump outlet filter (if used)

Clean filter.

 

is dirty or clogged

 

 

 

 

 

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 buildup 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.

8

311797F

Image 8
Contents GH 130, GH GH 230, GH Hydraulic Sprayers Models Electric Motor Kit OptionsFire and Explosion Hazard Skin Injection HazardPressurized Equipment Hazard Electric Shock HazardMoving Parts Hazard Equipment Misuse HazardPressurized Aluminum Parts Hazard Suction HazardComponent Identification Item No ComponentGrounding SAE O-Ring InstallationGeneral Repair Information Maintenance Pressure Relief ProcedureAfter the First 20 Hours of Operation After Each 100 Hours of Operation SEMI-ANNUALLYTroubleshooting Problem Cause Solution311797F Removal InstallationHydraulic Pump 227 Fan Belt Engine Flying Parts Hazard RemovalInstallationHydraulic Motor Rebuild 263 Hydraulic Oil/Filter Change Displacement Pump FiguresDisplacement Pump ProConnect 190 FIGSupport pump with your hand before opening t-handle Install pin 311797F Parts All SprayersParts List All Sprayers Parts Drawing Engines WASHER, GH300 PULLEY, GH300SPACER, GH300 SHIELD, GH300Parts Drawing All Sprayers Plug BELT, GH300Ring LABEL, GH130Parts Drawing All Sprayers GH200/230/300 Strainer CouplerFITTING, QD 267 MANIFOLD, GH200 Parts ListMANIFOLD, GH130 GH 130 & 200 Sprayers with Spray Gun and Hoses GH 230 & 300 Sprayers with Spray Gun and HosesSound Levels Technical DataDimensions Graco Standard Warranty For Graco Canada Customers