Troubleshooting - Kärcher Trailer HDS Series Operator's Manual

Maintenance

Troubleshooting

PROBLEM
LOW OPERATING
PRESSURE
DETERGENT
NOT
DRAWING
PUMP RUNNING
NORMALLY BUT
PRESSURE LOW
ON INSTALLATION
FLUCTUATING
PRESSURE
PUMP
NOISY
28
POSSIBLE CAUSE
Faulty pressure gauge
Insufficient water supply
Old, worn or incorrect spray nozzle
Plumbing or hose leak
Faulty or mis-adjusted unloader
valve (where applicable)
Worn packing in pump
Fouled or dirty inlet or discharge
valves in pump
Worn inlet or discharge valves
Air leak
Valve in the injector head may be
blocked, dirty or damaged
Filler screen on detergent suction
hose plugged
Dried up detergent plugging
metering valve
High viscosity of detergent
Hole in detergent line(s)
Low detergent level
Discharge water temperature above
180°F
Pump sucking air
Valves sticking
Unloader valve seat faulty
Nozzle incorrectly sized
Worn piston packing
Valves worn
Blockage in valve
Pump sucking air
Worn piston packing
Air in suction line
Broken or weak inlet or discharge
valve springs
Excessive matter in valves
Worn bearings
Karcher HDS 3.5/40 GE MT Operator's Manual 9.807-942.0 - C
SOLUTION
Install new gauge.
Use larger garden hose; clean filter washer at water
inlet.
Match nozzle number to machine and/or replace
with new nozzle.
Check plumbing system for leaks.
Re-tape leaks with teflon tape.
Adjust unloader for proper pressure.
Install repair kit when needed.
Install new packing kit.
Clean inlet or discharge valves.
Replace with valve kit.
Tighten all clamps.
Check detergent lines for holes.
Clean or replace valve in injector.
Clean or replace.
Disassemble and clean thoroughly.
Dilute detergent to specifications.
Repair hole.
Add detergent if needed.
Lower discharge water temperature.
Check water supply and possibility of
air seepage.
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 in 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.