Kärcher HDS 4.0/32 Pe Cage Manual page 21

PROBLEM
BURNER WILL
NOT LIGHT (continued
from previous page)
FLUCTUATING
PRESSURE
machine
SMOKES
Downloaded from ManualsNet.com
POSSIBLE CAUSE
Flex coupling slipping on fuel pump
shaft or burner motor shaft
On-Off switch defective
Heavy sooting on coil and burner
can cause interruption of air flow
and shorting of electrodes
Improper electrode setting
Fuel not reaching combustion chamber
Clogged burner nozzle
Thermostat faulty or slow engine speed Increase engine RPM to increase voltage.
Flow switch malfunction
Flow solenoid malfunction
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
Improper fuel or water in fuel
Improper air adjustment
Low fuel pressure
Plugged or dirty burner nozzle
Faulty burner nozzle spray pattern
Heavy accumulation of soot on coils and
burner assembly
Misaligned electrode setting
Obstruction in smoke stack
Low engine RPM
Karcher HDS 615-617 Operator's Manual 9.800-103.0 - V
search engine
SOLUTION
Replace if needed.
Check for electrical current reaching
burner assembly with burner switch on.
Clean as required.
Check and reset according to diagram in Oper-
ator's Manual.
Check fuel pump for proper flow. Check
solenoid flow switch on machines with spray
gun control, for proper on-off fuel flow control.
Clean as required.
Remove, test for continuity and replace as
needed.
Replace if needed.
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.
Drain tank and replace contaminated fuel.
Readjust air bands on burner assembly.
Adjust fuel pump pressure to specifications.
Replace nozzle.
Replace nozzle.
Remove coils and burner assembly,
clean thoroughly.
Realign electrodes to specifications.
Check for insulation blockage or other foreign
objects.
Increase RPM
Maintenance
21