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Karcher 2500 pressure washer pulsating

Posted by jm_eklund none (My Page) on
Mon, Sep 2, 13 at 19:37

I have been working on a karcher 2500 pressure washer I got in a garage sale. I have taken down the pump and replaced some of the valves and the spill valve. The hose it came with was cracked, but I didn't get a new one until I thought I could get every thing working. Once the pump was put back on it ran fine with the cracked up, but the pressure was lower than I thought it should be. I figured it must be the hose causing my pressure problems, so I got a new one. Ever since I put the new hose on the pressure wash pulsates (It has full pressure for a second or two then it loses pressure for a second or two.) Any ideas what could be causing this?


Follow-Up Postings:

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RE: Karcher 2500 pressure washer pulsating

Maybe the spring pressure regulator needs adjustment or replacement.
It may be unloading too early.


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RE: Karcher 2500 pressure washer pulsating

I have replaced the Unloader Valve. Is that the same thing as the pressure regulator? Sorry for my ignorance, but this model does let you adjust the pressure. Does it still have a pressure regulator?

Thanks for the help.


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RE: Karcher 2500 pressure washer pulsating

Try this first
Unit does not
reach high
pressure.
Diameter of garden hose is too
small.
Replace with a 5/8 inch or
larger garden hose.
Water supply is restricted. Check garden hose for kinks,
leaks and blockage.
Not enough inlet water supply. Turn water on full force.
Check garden hose for kinks,
leaks or blockage.
Water inlet filter is clogged. Remove filter and rinse out in
warm water.
Black detergent nozzle is
attached.
Remove black detergent
nozzle and attach high
pressure nozzle
Output pressure
varies high and
low.
Not enough inlet water supply. Turn water on full force.
Check garden hose for kinks,
leaks or blockage.
Pump is sucking air. Check that hoses and fittings
are air tight. Turn off machine
and purge pump by squeezing
trigger gun until a steady
flow of water emerges
through the nozzle.
Water inlet filter is clogged. Remove filter and rinse out in
warm water.
Spray nozzle is obstructed. Blow out or remove debris
with a fine needle.
Calcified gun, hose or spray
wand.
Run distilled vinegar through
detergent suction tube


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