Kärcher HDS3.5/20 Operator's Manual page 22

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PROBLEM
OIL
DRIPPING
LOW
OPERATING
PRESSURE
LOW
WATER
TEMPERATURE
22
TROUBLESHOOTING
POSSIBLE CAUSE
Oil seal worn
Faulty pressure gauge
Insuffi ent water supply
Old, worn or incorrect spray nozzle
Belt Slippage
Plumbing or hose leak
Faulty or misadjusted unloader valve
(where applicable)
Worn packing in pump
Fouled or dirty inlet or discharge valves
in pump
Worn inlet or discharge valves
Obstruction in spray nozzle
Leaking pressure control valve
(where applicable)
Detergent metering valve left open
sucking air or faulty metering valve
Slow motor RPM
Improper size of gas lines
Low gas pressure
Improper pressure regulator
Low gas pressure
Soot buildup on coils not allowing heat
transfer
Improper burner nozzle
9.801-509.0 - C • Karcher Operator's Manual
SOLUTION
Check and replace if necessary.
Install new gauge.
Use larger garden hose. Clean fi lter washer at
water inlet.
Match nozzle number to machine
and /or replace new nozzle.
Tighten or replace. Use correct belt.
Check plumbing system for leaks.
Retape leaks with tefl on tape.
Adjust unloader for proper pressure. Install
repair kit when needed.
Install new packing kit.
Clean inlet and discharge valve.
Replace with valve kit.
Remove obstruction.
Rebuild or replace as needed.
Close and /or replace metering valve.
Check incoming voltage.
See sizing gas lines.
Increase gas pressure to machine.
Specify BTU, building gas pressure 11 w.c.i.
to machine for correct sizing of regulator.
Increase gas pressure
Clean coils.
See serial plate.

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