Hitachi 4043 Troubleshooting, Problem Cause Solution, Service, Equipment Misuse Hazard

Troubleshooting

WARNING

To reduce risk of serious injury, including fluid injection and splashing in eyes, or on skin, always follow Pres- sure Relief Procedure on page 6 before proceeding.

Problem	Cause	Solution
Engine will not start or	No gasoline in fuel tank or carburetor.	Fill the tank with gasoline, open fuel shut off valve.
is hard to start		Check fuel line and carburetor.
	Low oil level.	Add to proper level.
	Start/Stop switch in Stop position.	Move switch to start position.
	Water in gasoline or old fuel.	Drain fuel tank and carburetor. Use new fuel and
		dry spark plug.
	Loose or wrong battery connection.	Check and tighten battery connections.
	Battery not properly charged.	Check electrolyte level of cells, recharge battery.
	Choked improperly. Flooded engine.	Open choke and crank engine several times to
		clear out gas.
	Dirty air cleaner filter.	Remove and clean.
	Spark plug dirty, wrong gap or wrong type.	Clean, adjust the gap or replace.
	Spray gun closed.	Trigger spray gun.
Engine misses or	Partially plugged air cleaner filter.	Remove and clean.
lacks power	Spark plug dirty, wrong gap or wrong type.	Clean, adjust the gap or replace.
	Incorrect ignition timing.	Time engine.
Low pressure and/or	Worn or wrong size tip.	Replace with tip of proper size.
pump runs rough	Inlet filter clogged.	Clean. Check more frequently.
	Worn packings, abrasives in water or natural	Check filter. Replace packings. See PUMP
	wear.	SERVICE.
	Inadequate water supply.	Check water flow rate to pump.
	Belt slippage.	Tighten or replace; use correct belts and replace
		both at same time.
	Fouled or dirty inlet or discharge valves. Even	Clean inlet and discharge valve assemblies. Check
	a small particle can cause the valve to stick.	filter.
	Restricted inlet.	Check garden hose, may be collapsed or kinked.
	Worn inlet or discharge valves.	Replace worn valves.
	Leaking high pressure hose.	Replace high pressure hose.
Water leakage from	Worn packings.	Install new packings. See PUMP SERVICE.
under pump manifold
Water in pump	Humid air condensing inside crankcase.	Change oil as specified in MAINTENANCE.
	Worn packings.	Install new packings. See PUMP SERVICE.
	Oil seals leaking.	Install new oil seals. See PUMP SERVICE.
Frequent or	Scored, damaged or worn plungers.	Install new plungers. See PUMP SERVICE.
premature failure of	Abrasive material in the fluid being pumped.	Install proper filtration on pump inlet plumbing.
the packings
	Inlet water temperature too high.	Check water temperature; may not exceed 160_F.
	Overpressurizing pump.	Do not modify any factory–set adjustments. See
		EQUIPMENT MISUSE HAZARD.
	Excessive pressure due to partially plugged or	Clean or replace tip. See Installing and Changing
	damaged tip.	Spray Tips.
	Pump running too long without spraying.	Never run pump more than 10 minutes without
		spraying.
	Running pump dry.	Do not run pump without water.
Strong surging at the	Foreign particles in the inlet or discharge	Clean or replace valves. See PUMP SERVICE.
inlet and low pressure	valve or worn inlet and/or discharge valves.
on the discharge side

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