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Bert Robinson
Bert Robinson Posted on Feb 22, 2010
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I have a Kew Hobby 80. The output from the lance is not constant but pulsates.

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  • Posted on Feb 22, 2010
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Could be the input water pressure is not sufficient. There is a pressure valve inside the machine that will cut off the motor if input pressure is too low or non existent.

Try a different source for the water input.

Testimonial: "I haven't had a chance to try the suggestion but it makes sense. Thank you."

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  • Posted on Aug 28, 2010
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Pulsing is caused by an air block in the hose. Best way to clear it is to hold the trigger open for a couple of minutes and it should clear. Also pull the nozzle forward so it is only on hose pressure and keep trigger open till it clears the air bloc.

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On high pressure it pulsates
First you have to do is try the machine without load. Attach everything as usual but do not attach the lance. Put on machine with water supply already on. If you close the gun the machine should stop. If you open the gun ( always with out lance)....the machine should start sending the water a bit far. If this is OK....then you have a lnance with a faulty, blocked NOZZEL.
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If with out lance your problem is still there....then the spill valve is faulty and the machine starts pulsating. AS I first said you must be sure that the nozzel is OK, so that you can blame the Spill Valve. When the spill valve is faulty the machine pulsates at high pressure.
I raely service Spill Valves (Control Valves). I change with a new one. When open the cover using a TORX T15 screw driver....you locate the spill valve where there are 2 wires coming out. Some machines have the spill valve incorporated with the head and the intake and delivery valves unit. This I advize to change with new parts. These all in one heads are very good because at one go you change the spill valve and the other valves in one go.
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Fulltech.
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