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MAINTENANCE 3700 PSI Pressure Washer PowerBOSS™
3. Place o-ring into recess. Push o-ring snugly against
in-line filter screen.
4. Assemble nozzle extension to spray gun, as described
earlier in this manual.
Nozzle Maintenance
A pulsing sensation felt while squeezing the spray gun
trigger may be caused by excessive pump pressure.The
principal cause of excessive pump pressure is a spray tip
clogged or restricted with foreign materials, such as dirt,
etc.To correct the problem, immediately clean the spray
tips following these instructions:
1. Shut off engine and turn off water supply.
2. Remove spray tip from end of nozzle extension.
3. Remove in-line filter from other end of nozzle extension.
4. Use a small paper clip to free any foreign material
clogging or restricting spray tip (Figure 13).
5. Using a garden hose, remove additional debris by back
flushing water through nozzle extension (Figure 14).
Back flush between 30 to 60 seconds.
6. Reinstall spray tip and in-line filter into nozzle extension.
7. Reconnect nozzle extension to spray gun.
8. Reconnect water supply, turn on water, and start engine.
9. Test pressure washer by operating with each quick
connect spray tips.
O–Ring Maintenance
Purchase an O–Ring/Maintenance Kit, part number
191922GS by contacting the nearest authorized service
center. It is not included with the pressure washer.This kit
includes replacement o-rings, rubber washer and water
inlet filter. Refer to the instruction sheet provided in the kit
to service your unit’s o-rings.
Pump Maintenance
Changing Pump Oil
Change oil after first 50 hours of operation and then every
200 hours or 3 months, whichever occurs first.
NOTE: When changing pump oil, use only high quality
nondetergent 30 weight oil. Use no special additives.
Change pump oil as follows:
1. Clean area around brass oil drain plug at bottom of
pump.
2. Remove oil drain plug. Drain oil completely into an
approved container.
3. When oil has completely drained, install oil drain plug
and tighten firmly.
4. Clean area around pump oil dipstick. Remove dipstick
and fill pump with recommended oil to “Full” mark on
dipstick (typically 0.43L or 15 oz.).
5. Install pump oil dipstick.
6. Wipe up any spilled oil.
ENGINE MAINTENANCE
See the engine operator’s manual for instructions on how
to properly maintain the engine.
KEEP OUT OF REACH OF CHILDREN. DON'T
POLLUTE. CONSERVE RESOURCES. RETURN
USED OIL TO COLLECTION CENTERS.
Use wire here to
remove debris
Figure 13 — Nozzle Maintenance
Figure 14 — Backflushing the Nozzle Extension
• Used motor oil has been shown to cause skin cancer in
certain laboratory animals.
• Thoroughly wash exposed areas with soap and water.
Avoid prolonged or repeated skin contact with used
motor oil.
CAUTION
• NEVER repair leaking connections with sealant of any kind.
Replace o-ring or seal.
The high pressure stream of water that this
equipment produces can pierce skin and its
underlying tissues, leading to serious injury and
possible amputation.
WARNING