Kärcher HD 3.0/27 G Service Manual page 10

For Models: HD 3.0/27 G, HD 3.4/35 G, HD 4.0/40 G, HD 4.0/40Ge
PROBLEM
ENGINE OPERATES
FOR 15 MINUTES
THEN STOPS
ENGINE LACKS
POWER
ENGINE FALTERS
WATER DRIPPING
FROM UNDER PUMP
OIL DRIPPING
FROM UNDER PUMP
WATER LEAKING
FROM PUMP
PROTECTOR
NO DETERGENT
GARDEN HOSE
CONNECTION
LEAKS
SPRAY WAND
LEAKS
PUMP IS NOISY
TROUBLESHOOTING
POSSIBLE CAUSE
Not enough gas or engine oil
Vapor lock developed by heat of day
Obstruction in fuel fi lter
Dirty air fi lter
Choke is opened too soon
Piston packing worn
O-Ring plunger retainer worn
Cracked piston
Oil seal worn or damaged
Spray gun closed with machine
running 5 minutes or longer
Excess water supply pressure
Detergent suction tube not properly
connected to machine
Detergent is too thick
Detergent fi lter valve is at lowest
setting
Filter on detergent suction tube is
clogged
Damaged or clogged detergent suc-
tion tube
A high pressure nozzle is attached.
Discharge nozzle is obstructed
Loose fi ttings
Missing/worn rubber washer
Spray wand not properly attached
Broken o-ring
Pump is sucking air
9.801-760.0 • Rev. 03/16
SOLUTION
Fill tank with gas. Check oil level.
Keep gas tank full to avoid vapor locking.
Clean or replace fuel fi lter.
Replace air fi lter.
Move choke to halfway position until engine
runs smoothly.
Call local distributor.
Call local distributor.
Call local distributor.
Call local distributor.
Open spray gun or turn off machine.
Place a pressure regulator at end of 50'
garden hose.
Check connection.
Dilute detergent. For best results, use
manufacturers detergent.
Set detergent fi lter valve to a higher setting.
Run warm water through fi lter to remove
debris.
Remove obstruction or replace detergent
suction tube.
Replace with black detergent nozzle.
Blow out or remove debris with fi ne needle.
Tighten fi ttings.
Insert new washer.
Slide the spray wand into the gun. Turn the
wand collar clockwise onto the spray gun
threads until tight.
Call local distributor and order an o-ring.
Check that hoses and fi ttings are air tight.
Turn off machine and purge pump by
squeezing trigger gun until a steady fl ow of
water emerges through nozzle.
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