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SYMPTOM
Engine won't
start
Won't Draw
Chemical
Pump running
normally but
pressure does
not achieve
rated values
Fluctuating
Pressure
Pressure drops
after period of
normal use
Pump noisy
Presence of
water in oil (oil
milky).
Water dripping
from pump
CAUSE
1. Engine throttle is in "OFF" Position.
2. Choke lever has not been placed to
choke.
3. Pressure buildup after initialuse.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
6.
1,
2.
3.
4.
1.
2. Pump suckingair.
3. Valves dirty or worn.
4. Worn bearings.
1.
2.
1.
2.
3,
SOLUTION
1. Slide throttle to "Rabbit" position,
2. Slide choke lever to choke position.
3. Depress trigger gun.
Place nozzlsto low pressure_
Check chemical screen;clean if obstructed.
Make sure chemicalscreen is submerged in
chemical/water.
Check and clean.
Nozzle not in chemical draw position. 1.
Chemical screen is obstructed. 2.
Chemical screen not working. 3.
Chemical injector orifice obstructed 4.
or stuck.
Chemical injector closed.
Water supply restricted. 1.
Nozzle is in low PSIpos_lan, 2.
Nozzle incorrector worn. 3.
Pump suckingair. 4.
Nozzle blocked. 5.
Pump sucking air. 1.
Garden hose inlet strainerclogged. 2.
Worn Seals or Packing, 3.
Inadequate water supply. 4.
Fouled or dirty inlet or discharge 5.
valves.
Leaky discharge hose. 6.
Nozzle clogged, partially obstructed. 1.
Nozzle wom. 2.
Pump Valves worn, dirty or stuck. 3.
Worn pump piston packing. 4.
Water too hot. 1.
2.
3.
4.
High humidity. 1.
Piston packing and oil seal worn. 2.
Thermal relief functioning normal. 1.
Fittings Loose.
O-rings of piston guide or retainer 2.
worn. 3.
Piston packing worn. 4.
Oil sealworn 1.
Loose drain plugor worn drain plug 2.
o-dng.
5. Open chemical injectorby turning adjustment
knob.
Check water supply and filterscreen for.
blockage. Check hoses for blockage, kinks,
leaks, etc.
Pull nozzleat end of wand back to the high pressure
position.
Check and replace.
Check that hoses and fittings ere air-tight.
Clean nozzle.
Check that hosesand fittings are airtight. Purge air
from garden hose.
Clean. Check filterfrequently.
Check end replace.
Check hose for kinks.
Check flow availableto pump. Check for
excessive heat, 145o F or above,
Clean inlet and discharge valve assemblies,
Replace if damaged.
Use nozzle cleaningkit to clear obstruction.(See
Nozzle Maintenance under Service Adjustment.)
Clean or replace.
Check and replace.
Check and replace.
Reduce temperaturebelow 63° C or 145° F.
Check that hoses and fittingsare air tight.
Check, clean or replace.
Check and replace if necessary.
Change Oil.
Check and replace oil seals.
Protecting pump, if not using pressure washer for
a long period of time, shutoffengine.
Tighten.
Check and replace.
Check and replace.
4.
Oil Dripping 1. Check and replace
2. Tightendrainplug orreplaceO-ring. Do notovertorque.
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