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I have Kew hobby 80-1 and the main lance which attaches to the trigger is blocked - - does not allow water to pass through - - what could be the cause?

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Posted on Jan 02, 2017

  • 92 Answers

SOURCE: I have an old kew pressure washer and when I pull

Dear dennis_partr,
In general all pressure washers have a control valve. This is sometimes refered to as the Spill Valve. When the trigger is pulled, the spill valve is in normal position. When the trigger is released, the spill valve compresses to let water circulate from its bottom part. If when the trigger is pulled and the bottom part of the spill valve does not close, then water keeps on circulating and hence no pressure. In this case change the spill valve with a new one. Also there could be a fault in the sucktion valves. If the sucktion vaves do not close, also water keeps on circulating. One also can examine the delivery valves. If these are not closing, then water is being sucked while delivering. Hence no pressure. Another cause but very rare, is that the swash plate that is pushing the pistons got loose. The electric motor will be turning, but the pistons stay in the same position.
I mentioned many causes, but usualy it is the spill valve. If with a new spill valve, there is still no pressure....then you must tackle the sucktion and then the delivery valves.
I wish to add that I assume that you have the correct lance and correct nozzel size. A worn out nozzel, will result in low prssure too.
Regards,
Fulltech.

Posted on Apr 22, 2009

  • 1 Answer

SOURCE: kew hobby 80-1 instructions

I have a kew hobby 70 with little use. The nozzle wont spray, it just sends a weak jet of water. how can i fix it? I have hardly used it. It has been
in a shed for years . thanks

Posted on Dec 19, 2009

  • 569 Answers

SOURCE: I have a Kew Hobby 80. The output from the lance

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.

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.

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Sep 29, 2009 | Garden

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No pressure unless i take the nosle off , pull trigger and put nossel back on then it's ok until i release the trigger again ?


unloader valve sticking in the pump head. remove unloader valve/ pressure reducing valve as per parts manual.

It will probably be caked up in white crystal type deposits if its an aluminium pump head. clean off the deposits and inspect the 'o' rings. if 'o' rings ok , apply silicon grease and refit.

It could also be a partially blocked lance jet not allowing enough water to come out of the lance if it is a flow sensitive unloader valve.

Jul 11, 2009 | Karcher 2500 PSI Pressure Washer

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I have an old kew pressure washer and when I pull the trigger on the lance, the water jet is only at mains pressure.


Dear dennis_partr,
In general all pressure washers have a control valve. This is sometimes refered to as the Spill Valve. When the trigger is pulled, the spill valve is in normal position. When the trigger is released, the spill valve compresses to let water circulate from its bottom part. If when the trigger is pulled and the bottom part of the spill valve does not close, then water keeps on circulating and hence no pressure. In this case change the spill valve with a new one. Also there could be a fault in the sucktion valves. If the sucktion vaves do not close, also water keeps on circulating. One also can examine the delivery valves. If these are not closing, then water is being sucked while delivering. Hence no pressure. Another cause but very rare, is that the swash plate that is pushing the pistons got loose. The electric motor will be turning, but the pistons stay in the same position.
I mentioned many causes, but usualy it is the spill valve. If with a new spill valve, there is still no pressure....then you must tackle the sucktion and then the delivery valves.
I wish to add that I assume that you have the correct lance and correct nozzel size. A worn out nozzel, will result in low prssure too.
Regards,
Fulltech.

Apr 21, 2009 | Electric Garden

1 Answer

Found this presure washer in the basement and want to know if it works the motor runs when you plug it in but does not build press. The brand is kew hobby


This may be as simple as still having air in the system.  Connect the machine to the water supply (but not the electric) then squeeze the trigger and allow water to flow for at least 60 seconds.  During that process, hold the nozzle outlet under the surface of water in a bucket so you can see when air stops coming out.  Keep going until you're sure there's no more air in the system.  Then switch it on.  If it still does not come up to pressure you'd probably be wise to abandon it.

Apr 16, 2009 | Garden

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