I have a large commercial pressure washer with the same unloader/relief valve you have. Sometimes the unloader does cycle for some reason when it runs with the wand closed. Mine is a electric unit with a 5 HP motor on it, a unit with a gasoline engine would really be noticeable when the unloader cycles. Probably what your unit is doing. Greg
Hm, thanks, that's encouraging. I will try it under load when the weather turns better.
iOn 7 Mar 2005 05:20:45 GMT, Ignoramus17028 vaguely proposed a theory ......and in reply I say!:
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Not Shawn. But like he said, heavy equipment. I use one to wash down earthmoving machinery. I have a dozer, and the dirt really gets compacted into the tracks and the undercarriage. Before greasing and working in it, (and sometimes just to keep the weight down! ) I give it a washdown. The little 1500 PSI jobs really struggle.
Also, on metal surfaces, you can work on loose paint, or even test for bad paint jobs. Just remember that what stays on there _may_ have water forced under it. You need to allow for this before repainting.
I have seen a guy taking off the bottom fouling on a boat. The fouling, not the paint.
Very nice. Just how dangerous do you feel 3000 PSI is? I have a personal story to share, I bought a 22" gas powered chainsaw and soon later decided to sell it because I was afraid of it. Lost about $15 but I am happy with this decision to this day. So, I may be extra careful, but only because I know that I am absent minded.
It is a good idea actually. I did not think of that. I have a chance to get a couple of pallet jacks, to keep one, and may decide to get a lift of some sort. I would not call my wheeling and dealing high volume though, but it is nice to be able to deal with occasional heavy stuff. I have advantage over other buyers who are unable to deal with those items, due to lack of trucks and hoists. The serious industrial buyers are not interested in making a few hundred bucks on various oddities that need love and attention, and the little guys without material handling abilities cannot deal with this stuff either.
i
Like OldNick said, heavy machinery. I used one at a welding and repair shop I worked at that was 3500 psi. We would clean farm equipment, earthmoving machines and mining equipment before bringing it in for work. This unit would strip paint in a heartbeat if you weren't careful. We always greased things like backhoe pins and any other non-sealed joint after the wash too. The nice thing about pressure washers with this much power is that when you put a fan nozzle (I think that's what they are called) on it, you still have a pressure washer, not a glorified garden hose like a 1500 psi unit is. BTW, you started a previous thread about lifting pallets that I meant to respond to. For as much DRMO business as you do, why not get a Tommy Lift for your truck?
Shawn
Why worry about changing the pump ? Just put on a nozzle with a higher flow rate . Drop the pressure for about 5 bucks . Better yet get a quick disconnect that allows you to pop in nozzles and have a wide range available instantly . They are a few dollars more per nozzle but still under 10 bucks . Luck Ken Cutt
The internal pressure (not being let out of the 'jar') might turn off the pump or divert... then the pressure drops and it enables... Don't want to pump up a hose or a body such that it explodes while you answer the cell phone... :-) That is my guess.
Try spraying - and see. It might smooth out.
Martin
On 8 Mar 2005 04:54:24 GMT, Ignoramus26383 vaguely proposed a theory ......and in reply I say!:
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hmmm...ok. I will keep trying. Very. You are talking hydraulic machinery pressure here.
Do NOT point at your body, or at any body else or animal etc. I feel that a chainsaw would make more of a mess (never seen a demo of "fake human" and a water jet) but the water will get under the skin and into the muscle, not just cut it. You could get real tissue damage.
Contact with the nozzle itself while spraying would be deadly, I would think. This lessens with distance, but is by no means minimal.
Ignoramus17028 wrote: ...
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You've replied that this happens when the washer is just sitting, not spraying, you think. I have a 5 hp gas washer that had a problem cycling while spraying. It was very annoying. I discovered that the nozzle was partially clogged. This caused the bypass/diverter to open because the high pressure looked like the wand valve was closed. But there was enough flow to close the diverter and start the cycle again. Keeping the nozzle clean stopped the cycling.
HTH somebody, Bob
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