Troubleshooting - Kärcher HDS3.5/20 Operator's Manual

PROBLEM POSSIBLE CAUSE
WATER Incoming water to machine warm or hot
TEMPERATURE
Gas pressure too high
TOO HOT
Detergent line sucking air
Defective high limit switch
Incorrect burner nozzle size
Insuffi cient water supplied
Restricted water fl ow
PRESENCE OF Oil seal worn
WATER IN OIL
High humidity in air
WATER Piston packing worn
DRIPPING
O-Ring plunger retainer worn
FROM UNDER
PUMP
DETERGENT Air leak Tighten all clamps.
NOT
Detergent metering valve packing not tight
DRAWING
or packing worn
Filter screen on detergent suction hose
plugged
Dried up detergent plugging metering valve
High viscosity of detergent
Restriction behind fl oat tank screen
removed
Hole in detergent line(s)
Strainer basket plugged
Connections on selector valve loose
Detergent solenoid not opening
(where applicable)
PUMP Pump sucking air
RUNNING
Valves sticking
NORMALLY
Unloader valve seat faulty
BUT PRESSURE
Nozzle incorrectly sized
LOW ON
INSTALLATION
Worn piston packing
FLUCTUATING Valves worn
PRESSURE
Blockage in valve
Pump sucking air
Worn piston packing
PUMP Air in suction line
NOISY
Broken or weak inlet or discharge valve
springs
Excessive matter in valves
Worn bearings

TROUBLESHOOTING

9.801-509.0 - C • Karcher Operator's Manual
SOLUTION
Lower incoming water temperature.
See specifi cations for proper gas pressure.
Tighten all clamps. Check detergent lines
for holes.
Replace.
See serial plate.
Check water GPM to machine.
Check nozzle for obstruction, proper size.
Check and replace if necessary.
Check and change oil twice as often.
Check and replace if necessary.
Check and replace if necessary.
Check detergent lines for holes.
Tighten nut. Replace valve or packing.
Clean or replace.
Disassemble and clean thoroughly.
Dilute detergent to specifi cations.
Install restriction.
Repair hole.
Remove and clean.
Put tefl on tape on all pipe connections.
Check fl ow switch, replace detergent
solenoid.
Check water supply and possibility of air.
Check and clean or replace if necessary.
Check and replace if necessary.
Check and replace if necessary
(See serial plate for proper size).
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check water supply and air seepage at
joints in suction line.
Check and replace if necessary.
Check water supply and connections on
suction line.
Check and replace if necessary.
Check and clean if necessary.
Check and replace if necessary.
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