Kärcher HDS 3.9/30 Pe Cage Operator's Manual page 24

Maintenance
PROBLEM
LOW
WATER
TEMPERATURE
WATER
TEMPERATURE
TOO HOT
PUMP
NOISY
PRESENCE
OF WATER
IN OIL
WATER
DRIPPING
FROM
UNDER PUMP
24
POSSIBLE CAUSE
Improper fuel or water in fuel
Low fuel pressure
Weak fuel pump
Fuel filter partially clogged
Soot build-up on coils not allowing
heat transfer
Improper burner nozzle
Incoming water to machine warm or
hot
Fuel pump pressure too high
Fuel pump defective
Detergent line sucking air
Defective temperature switch
Incorrect fuel nozzle size
Insufficient water supplied
Restricted water flow
Air in suction line
Broken or weak inlet or discharge
valve springs
Excessive matter in valves
Worn bearings
Oil seal worn
High humidity in air
Piston packing worn
O-Ring plunger retainer worn
Cracked piston
Pump protector
Karcher HDS 600-606 Operator's Manual 9.800-080.0-AC
SOLUTION
Replace with clean and proper fuel.
Increase fuel pressure.
Check fuel pump pressure. Replace pump if
needed.
Replace as needed.
Clean coils.
See specifications.
Lower incoming water temperature.
See specifications for proper fuel pressure.
Replace fuel pump.
Tighten all clamps. Check detergent
lines for holes.
Replace.
See specifications for proper fuel nozzle.
Check water G.P.M. to machine.
Check nozzle for obstruction, proper size.
Check water supply and connections on
suction line.
Check and replace if necessary.
Check and clean if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and change oil twice as often.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Lower water supply pressure. Do not run
with spray gun closed longer than 2 minutes