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Manual Karcher 9.800-191.0
PRESSURE W
ASHER T
roubleshooting Guide
30
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW OPERATING
PRESSURE
Faulty pressure gauge
Install new gauge.
Insufficient water supply
Use larger garden hose; clean filter washer at water inlet.
Old, worn or incorrect spray nozzle
Match nozzle number to machine and/or replace with new
nozzle.
Plumbing or hose leak
Check plumbing system for leaks. Re-tape leaks with teflon
tape.
Faulty or mis-adjusted unloader valve
(where applicable)
Adjust unloader for proper pressure. Install repair kit when
needed.
Worn packing in pump
Install new packing kit.
Fold or dirty inlet or discharge valves in pump
Clean inlet or discharge valves.
Worn inlet or discharge valves
Replace with valve kit.
DETERGENT NOT
DRAWING
Air leak
Tighten all clamps. Check detergent lines for holes.
Valve in the injector head may be blocked, dirty,
or damaged
Clean or replace valve in injector.
Filler 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.
Discharge water temperature above 180° F
Lower discharge water temperature.
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
ON INSTALLATION
Pump sucking air
Check water supply and possibility of air
Valves sticking
Check and clean or replace if necessary.
Unloader valve seat faulty
Check and replace if necessary
Nozzle incorrectly sized
Check and replace if necessary (see serial plate for proper size).
Worn piston packing
Check and replace if necessary.
FLUCTUATING
PRESSURE
Valves worn
Check and replace if necessary.
Blockage in valve
Check and replace if necessary.
Pump sucking air
Check water supply and air see page at joints in suction line.
Worn piston packing
Check and replace if necessary.
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.
LOW WATER
TEMPERATURE
Improper fuel or water in fuel
Drain fuel tank and replace with proper fuel.
Low fuel pressure
Increase fuel pressure.
Weak fuel pump
Check fuel pump temperature. Replace pump if needed.
Fuel filter partially clogged
Replace as needed.
Soot build up on coils
Clean coils with soot remover.
Lime build up on coils
Clean inside of coils using coil cleaner.
Improper burner nozzle
Call technical service for proper size.
WATER
TEMPERATURE
TOO HOT
Incoming water to machine warm or hot
Lower incoming water temperature.
Fuel pump pressure too high
Lower fuel pressure.
Fuel pump defective
Replace fuel pump.
Detergent line sucking air
Tighten all clamps. Check detergent line for holes.
Defective high limit switch (thermostat)
Replace.
Insufficient water supplied
Check GPM to machine.
Restricted water flow
Check nozzle for obstruction, proper size.
TROUBLESHOOTING
Summary of Contents for HDS 2.0/10 Ed Cage
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