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5.0 Maintenance
5.1 Pump Crankcase Lubrication
Proper pressure washer pump crankcase lubrication will help extend the working life of the
machine. Follow these important recommended guidelines:
- Change oil after initial 50 hour run-in period.
- Simpson pump oil is recommended as the first choice. Change Simpson pump oil at 250 hour intervals.
- If Simpson pump oil is not available, a high quality 30 weight non-detergent oil may be used. These oils
should be changed every 100 hours.
- Direct drive machines should have the pump oil changed at least every 50 hours, regardless of the type
of oil used. More frequent oil changes will further enhance the pump’s working life.
- Pump oil level can be checked with a dip stick or, for pumps with oil level sight gauges, viewing the sight
gauge. Oil level is correct if at the center of the circle. If oil level is low, fill to correct level with recom-
mended oil. DO NOT OVERFILL crankcase!
- Some pumps may not have either a dipstick or sight gauge. Oil levels in these pumps can only be checked
by draining the crankcase and measuring the oil amount. If oil level is incorrect, replace with the proper
amount and type as recommended by the pump manufacturer.
5.2 Preventative Maintenance
- Give model and serial number when ordering parts or requesting information. See Section 1.5, Machine
Warning Tags and Specification Plate, Fig. 1-4.
- Read all instructions and familiarize yourself with the unit before operating.
- Keep incoming water filter clean.
- Use only nozzles of size furnished with machine.
- Drain water from pressure hoses, gun and extension and accessories after use.
- Protect pump from freezing. Failure to remove water from the pump in freezing temperatures will result in
damaged pump manifold. A winterizing siphon kit (Part No. WK 590-10) is available for this purpose. Using
this kit, a 50-50 mixture of ethylene glycol type anti-freeze and water is siphoned into the pump to replace
the plain water.
- Use ONLY injector of the size and type designed for your model.
- DO NOT tamper with unloader valve adjustment or alter engine speed.
- DO NOT connect siphon hose to pump inlet for the purpose of siphoning cleaning chemicals through
pump. The machine is designed for direct loop up to water supply.
- DO NOT exceed 140° F temperature on incoming water supply.
Gasoline and Diesel Engines:
- Keep air filter clean and engine in tune.
- Check oil level in engine each time gas tank is filled. Change oil in the engine at required intervals, and use
only recommended grade engine oil.
- ALWAYS close fuel valve when transporting or storing unit.
- Before storing unit for long periods of time, drain fuel tank and carburetor of all fuel. As an alternative, use a
commercially available gasoline preservative additive when storing machine for shorter periods (up to 6
months).
Electric Models:
- Check the condition of the electrical cord. Damaged cords should be replaced.
- DO NOT REMOVE THE GROUND FAULT INTERRUPTER (GFCI) FROM THE ELECTRICAL CORD.
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