22
Maintenance
Troubleshooting
Problem
Possible Cause
Solution
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or hot
Lower incoming water temperature.
Fuel pump pressure too high
See specifications for proper fuel pressure.
Fuel pump defective
Replace fuel pump.
Detergent line sucking air
Tighten all clamps. Check detergent lines for
holes.
Defective temperature switch
Replace.
Incorrect fuel nozzle size
See specifications for proper fuel nozzle.
Insufficient water supplied
Check water G.P.M. to machine.
Restricted water flow
Check nozzle for obstruction, proper size.
PUMP NOISY
Air in suction line
Check water supply and connections on
suction line.
Broken or weak inlet or discharge valve
springs
Check and replace if necessary.
Excessive matter in valves
Check and clean if necessary.
Worn bearings
Check and replace if necessary.
PRESENCE OF
WATER IN OIL
Oil seal worn
Check and replace if necessary.
High humidity in air
Check and change oil twice as often.
WATER DRIPPING
FROM UNDER
PUMP
Piston packing worn
Check and replace if necessary.
O-Ring plunger retainer worn
Check and replace if necessary.
Cracked piston
Check and replace if necessary.
Pump protector
Lower water supply pressure. Do not run
with spray gun closed longer than 2 minutes.
OIL DRIPPING
Oil seal worn
Check and replace if necessary.
EXCESSIVE
VIBRATION IN
DELIVERY LINE
Irregular functioning of the valves
Check and replace if necessary.
DETERGENT NOT
DRAWING
Air leak
Tighten all clamps. Check detergent lines for
holes.
Restrictor in float tank is missing
Replace restrictor. Check for proper orifice
in restrictor.
Filter screen on detergent suction hose
plugged
Clean or replace.
Dried up detergent plugging metering valve
Disassemble and clean thoroughly.
High viscosity of detergent
Dilute detergent to specifications.
Hole in detergent line(s)
Repair hole.
Low detergent level
Add detergent, if needed.
KÄRCHER TRAILER OPERATORS MANUAL • 9.807-794.0-B
Summary of Contents for 1.103-843.0
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