Hitachi 309379 warranty Troubleshooting

Troubleshooting

WARNING

INJECTION HAZARD

To reduce risk of serious injury, when instructed to relieve pressure, follow steps 1. – 6.; page 4.

PROBLEM	CAUSE	SOLUTION
Gas engine pulls hard (won’t start)	Hydraulic pressure is too high	Turn hydraulic pressure knob ccw to lowest setting
Gas engine will not start	Switch OFF, low oil, no gasoline	Consult engine manual, supplied
Gas engine races to high rpm at	Engine governor worn	Contact Honda Engine Service Center
stall – bogs down on operation
Gas engine operates, but	Directional valve not switching	Turn pump switch OFF, then ON; manual 309379
displacement pump does not
	Pump switch is OFF	Turn pump switch ON
	Pressure setting too low	Increase pressure, manual 309378
	Displacement pump outlet filter (if	Clean the filter
	used) 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 immediately. Add fluid*; page 4.
	Hydraulic pump worn or damaged	Bring sprayer to Graco distributor for repair
	Displacement pump rod seized by	Service pump; manual 309277
	dried paint
Displacement pump stays in down-	Powered off sprayer with engine ON/	Start engine. Turn pump switch OFF, then ON. In-
stroke	OFF. Magnet below bottom sensor.	crease pressure.
Displacement pump operates, but	Piston ball check not seating properly.	Service piston ball check; manual 309277.
output is low on upstroke	Piston packings worn or damaged.	Replace packings; manual 309277.
Displacement pump operates but	Piston packings worn or damaged.	Remove clip and retighten or replace packings;
output is low on downstroke and/	Intake valve ball check not seating	manual 309277.
or on both strokes
	properly.	Service intake valve ball check; manual 309277
Paint leaks and runs over side of	Loose wet–cup	Tighten just enough to stop leakage
wetcup	Throat packings worn or damaged	Replace packings; manual 309277
Excessive leakage around	Piston rod seal worn or damaged	Replace these parts; manual 309379
hydraulic motor piston rod wiper
Fluid delivery is low	Pressure setting too low	Increase pressure, manual 309378
	Displacement pump outlet filter (if	Clean filter
	used) 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 hose
The sprayer overheats	Cooler is damaged	Replace
	Oil level is low	Fill with oil. See page 6.
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
DTS does not display	Loose wiring	Remove cover and correct poor connections
	Bad LCD or board	Bring sprayer to Graco distributor for repair
DTS displays error codes	Various over-pressure conditions	Page 11

*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid, page 4.

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