Troubleshooting - Kärcher HDS 3.9/20 Ea Cage Operator's Manual

PROBLEM POSSIBLE CAUSE
LOW OPERATING Faulty pressure gauge
PRESSURE
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
DETERGENT Air leak
NOT DRAWING
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 RUNNING
Pump sucking air
NORMALLY BUT
PRESSURE LOW
Valves sticking
ON INSTALLATION
Unloader valve seat faulty
Nozzle incorrectly sized
Worn piston packing
FLUCTUATING Valves worn
PRESSURE
Blockage in valve
Pump sucking air
Worn piston packing
PUMP NOISY
Air in suction line
Broken or weak inlet or discharge
valve springs
Excessive matter in valves
Worn bearings

TROUBLESHOOTING

HDS 505, 508, 509, 510 • 9.800-078.0 • Rev. 4/13
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. Retape 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.
13