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post #1 of 8 Old 10-21-2017, 02:59 PM Thread Starter
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nozzle wear

My machine is supposed to be 200 bar [2900 psi] at 15 LPM [3.9GPM]

3 phase electric, so the rpm is constant.

The pressure has been dropping, and is now down to 120 bar [1740].

So either it's leaking internally, or the stainless steel orifice has worn larger. I changed it not so long ago.

So my question is, how quickly does such a thing wear out?

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post #2 of 8 Old 10-21-2017, 10:17 PM
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Re: nozzle wear

not sure what it will take for a beating
but do know ss bends as fast as alum
does anyone make one out of copper

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post #3 of 8 Old 10-25-2017, 10:22 AM
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Re: nozzle wear

The orifice (or nozzle) will eventually wear and open up larger and larger, thus causing a drop in system pressure, and effective cleaning power. How long does this take? Depending on use, I would estimate anywhere from 50-75 hours it would show signs of wear and pressure loss. It could also be the unloader valve sticking or seals worn, as you mentioned. If a new nozzle doesn't cure it, then it's internal on the pump.

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post #4 of 8 Old 10-27-2017, 04:36 AM Thread Starter
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Re: nozzle wear

Thanks; I'm guessing around 40 hours since I replaced the orifice, but could be wildly off.
I didn't think the wear would be so fast. Anyway, I ordered 2 new orifices to try.


I've had the machine for something like 30 years, the shop who sold it went under 28 years ago and the company that sold it to them it went under 20 years ago.
I figured it wasn't likely that they had made their own pump, it was a German power tool maker [Electrabecum] who didn't sell a lot of pressure washers; it took some digging but I was right, and got a rebuild kit from Italy for it. That was around 10 years ago.
The unloader, hose, lance, orifice, and all that are common to all the similarly sized machines and have all been changed at some point.

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post #5 of 8 Old 11-24-2017, 03:45 AM Thread Starter
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Re: nozzle wear

I finally received the replacement orifice; it made no difference at all, I still only have 60% rated pressure.
I blocked off the unloader valve and tied the lance trigger open for testing, no change.

It seems that the valves are considered the next likely suspect, but I had them out and tested them by mouth; no leakage at low pressure so I have doubts that they leak significantly at high pressure.
10 years ago when I changed them last, I had the same experience, they were not the problem; it was the piston seals.

The company that assembled and sold the washer is long gone, but the Italian company that made the pump still exists, and seems to be owned by Karcher. I wrote to them about parts for the old pump. It's been discontinued, but hopefully a later model will use the same seals...

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post #6 of 8 Old 12-16-2017, 06:44 PM Thread Starter
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Re: nozzle wear

So; I replaced the pump seals, Orings, valves, and the unloader.
Still shows about half the pressure it should have.

There's only 1 part I didn't change that could cause this, as far as I know.




The pressure gauge.

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post #7 of 8 Old 12-16-2017, 09:46 PM
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Re: nozzle wear

Does it feel like it isn't cleaning as well as it should be? Maybe it's just the gauge...


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post #8 of 8 Old 12-17-2017, 06:14 PM Thread Starter
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Re: nozzle wear

It's so subjective, I can never tell. Washing doesn't need much power, but sometimes I use it for prepping things for painting; then I want it to strip off loose paint and rust.

I held it on the wall of my house, and it dug a hole into the cement; so I guess it's got power.

I suppose I'll change the gauge.

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