Troubleshooting - Kärcher HDS NG 4.5/22 Ea St - 1.575-715.0 Operator's Manual

PROBLEM
WATER
TEMPERATURE
TOO HOT
PRESENCE OF
WATER IN OIL
WATER
DRIPPING FROM
UNDER PUMP
DETERGENT
NOT DRAWING
PUMP RUNNING
NORMALLY
BUT PRESSURE
LOW ON
INSTALLATION
FLUCTUATING
PRESSURE
PUMP NOISY
OIL DRIPPING
EXCESSIVE
VIBRATION IN
DELIVERY LINE
RELIEF VALVE
LEAKS WATER
18

TROUBLESHOOTING

POSSIBLE CAUSE
Incoming water to machine warm or hot
Gas pressure too high
Detergent line sucking air
Defective high limit switch
Incorrect burner nozzle size
Insufficient water supplied
Restricted water flow
Oil seal worn
High humidity in air
Piston packing worn
O-Ring plunger retainer worn
Air leak
Detergent metering valve packing not tight or
packing worn
Filter screen on detergent suction hose
plugged
Dried up detergent plugging metering valve
High viscosity of detergent
Restriction behind float tank screen removed
Hole in detergent line(s)
Strainer basket plugged
Connections on selector valve loose
Detergent solenoid not opening (where
applicable)
Pump sucking air
Valve sticking
Unloader valve seat faulty
Nozzle incorrectly sized
Worn piston packing
Valve worn
Blockage in valve
Pump sucking air
Worn piston packing
Air in suction line
Broken or weak inlet or discharge valve springs Check and replace if necessary.
Excessive matter in valves
Worn bearings
Oil seal worn
Irregular functioning of the valves
Relief valve defective
715-721 • HDS-NG LP • 9.800-160.0 • Rev. 4/10
SOLUTION
Lower incoming water temperature.
See Installation for specifications for proper gas pres-
sure.
Tighten all clamps. Check detergent lines for holes
Replace.
See serial plate.
Check water GPM to machine.
Check nozzle for obstruction, proper size.
Check and replace if necessary.
Check and change oil twice as often.
Check and replace if necessary.
Check and replace if necessary.
Tighten all clamps. Check detergent lines for holes.
Tighten nut. Replace valve or packing.
Clean or replace.
Disassemble and clean thoroughly.
Dilute detergent to specifications.
Install restriction.
Repair hole.
Remove and clean.
Put teflon tape on all pipe connections.
Check flow switch, replace detergent solenoid.
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 if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check water supply and air seepage at joints in suc-
tion line.
Check and replace if necessary.
Check water supply and connections on suction line.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Check and replace if necessary.
Replace or repair.