The plastic check valve is located inside the water inlet of the unit. When you remove the water inlet elbow, the check valve can be accessed. The o-ring broke, causing the unit to surge on its own when on and the trigger is not being pulled. Need new mm 0-ring, but what size and hardness
SOURCE: Kracher k3 97, low pressure
your pressure relief valve is stuck open. try adjusting the nut shaped stem on the front of the valve to see if you can unstick it. if not you'll have to take apart and clean.
SOURCE: Karcher K3.91 compressor run for a few seconds every 10-15 second
They have a problem. I removed both valves and lubed with lithium grease as I was told. Unit is now working for how long who knowes.
SOURCE: motor starts and stops
Diagram here
It could be the Overpressure valve is leaking #20
It could be one of the small valves is not sealing #14 and #15
The soap valve could be not sealing #7
I have also seen micro cracks in the cylinder head #8
Good Luck
SOURCE: I have had 3 Karcher pressure washers all
If your water is that hard (and it appears it is) WD40 will NOT solve the problem. You should look into a water softener. However, chances are that a small, inexpensive model will not have the flow capacity required for a pressure washer. You'll likely need to look at a larger, whole-house model.
Use vinegar to through the machine's "soap" dispenser to break up the hard water deposits or a heavier solvent such as CLR which is available at most retail outlets.
SOURCE: Turn water on then actuate wand trigger. Pressure
You gave a very close solution yourself for the problem. But other leakages can cause such symtoms.Forexample a leaking head or a leaking chemical inlet. These can be caused because the spill valve (pressure control valve) is stuck. When this valve stucks it will leave a micro switch ON. So the machine keeps working with the gun closed. This will in turn creat internal pressure and damages the head, valves and chemical non-return and even damage outlet hose. So besides fixing the leakages you must check and service the spill valve. I often replace the spill valve. One must also checks if the micro switch is faulty. Now very important that what you mentioned that the machine cycles at one minute intervals, with trigger closed...this is most probably always the spill valve fault. If you open machine you see a place where there is a wire..this belongs to the micro switch...under you find the spill valve. Intake and suction valves may now also have a fault. Also there are systems with non-return valves at the machine outlet. You have to tackle by elimination. Fix the leakage..then tackle spill valve and micro switch.
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THERMOSTAT REMOVAL HINT: Removal of the thermostat would have an adverse effect causing a lowering of cooling efficiency. Do not
remove the thermostat, even if the engine tends to overheat. 1. DRAIN ENGINE COOLANT 2. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE 3. DISCONNECT ECT SW1TCH CONNECTORS 4. DISCONNECT ENGINE VIRE PROTECTOR FROM WATER INLET AND RH CYLINDER HEAD Remove the 2 nuts, and disconnect the engine wire protector from the water inlet and cylinder head. 5. DISCONNECT WATER INLET PIPE FROM WATER INLET AND LH CYLINDER HEAD a) Remove the bolt and disconnect the inlet pipe from the water inlet. b) Remove the O-ring from the inlet pip e. 6. REMOVE WATER INLET AND THERMOSTAT a) Remove the 3 nuts, water inlet and thermostat. b) Remove the gasket from the thermostat. INSPECTION INSPECT THERMOSTAT HINT: The thermostat is numbered with the valve opening temperature. a) immerse the thermostat in water and gradually heat the water. b) Check the valve opening temperature. Valve opening temperature: 80 - 84CC (176- 183 deg f) If the valve opening temperature is not as specified, replace the thermostat. c) Check the valve lift. Valve lift: 10.0 mm (0.394 inch) or more at 95CC (203 deg f) If the valve lift is not as specified, replace the thermostat d) Check that the valve is fully closed when the thermostat is at low temperatures (below 40CC (104CF)). if not dosed, replace the thermostat. INSTALLATION 1. PLACE THERMOSTAT IN WATER PUMP a) Install a new gasket on to the thermostat. b) Align the thermostat jiggle valve with the upper stud bolt and insert the thermostat in the water inlet housing. HINT: The jiggle valve maybe set within 15 deg of either side of the prescribed position. 2. INSTALL WATER INLET Install the water inlet with the 3 nuts. Torque: 8.0 Nm (80 kgf-cm, 69 inch lbs.) 3. INSTALL WATER INLET PIPE a) Install a new O-ring to the water inlet pipe.
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Regards, Lee Davidian
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