HELP -- Pressure Isn't Right

greg/sd said:
Use a jumper hose to test your nozzles that will tell you if the longer hose is the problem.
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Great idea Greg...I will try that in the morning as my neighbor might shoot me if I try it now (almost 11 pm). Putting together a list of things to order tonight and might add those new ceramics! Thanks.
 
Nigel has a very good point....you may be barking up the wrong tree unless you have a concrete baseline to gauge against. Fix the swivel and see if it cleans like it use to.
You said you switched unloaders sometime back, did you test pressure in the same manner you are testing now with the same amount of hose after you made the switch?
 
Mike V said:
And you are 100% sure that all of your water supply hoses are tight and not sucking ANY air? The water filter o-ring is in good shape and is seated as to not let ANY air in?
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Mike, that was the first thing I checked...Learned from that mistake once already.
 
810f250 said:
If you dont have a guage on the pump head , you cant determine how much pressure you are loosing.

If I understand you correctly, you have the guage after the length of hose(200' 3/8") and before the gun (with new correct nozzle) and the guage reads 2900,

but did you ever conduct this pressure test in the manner in which I have described before today?

Maybe all you were getting in the past was 2900psi and you did not know it!
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Nigel...if I take off the hose and attached my gauge right on connection out of heater (no chemical injector either)....then put my gun with a new nozzle on it and press trigger. Should that give me an accurate psi reading? I don't know how to attach a gauge to my TS2021 (nor anything else about pumps). I think I will at least try that just to take the 200' 3/8" hose out of the equation.
 
HighTide said:
Nigel...if I take off the hose and attached my gauge right on connection out of heater (no chemical injector either)....then put my gun with a new nozzle on it and press trigger. Should that give me an accurate psi reading? I don't know how to attach a gauge to my TS2021.
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That is still is not on the pump head, although the friction losses in 1/2" coil is far less than 3/8"hose, you want the guage on the head or just after the outlet port of the pump. And also before the unloader (losses there too)

You could use a "tee" fitting and mount the guage on that or there is fitting that replaces one of the valve caps on the general pumps that has a port built in for a guage.
 
Like this one

Gauges_Gauge_Port_Valve_Cap_1060.jpg


I have read that it is advised that you put a valve to isolate a pressure guage on the pump head, because the vibration shorten guage life, I went through 2 guages on pump heads in 100 hrs.

The guage is only a tool, ...............if you are not testing anything that need you to determine the head pressure close the valve to the guage, save yourself $10-15
 
I helped David yesterday plumbing his bypass line (back to the tank) and installing a Hudson float valve and fittings to connect to a garden hose.
After adjusting the belt tension we checked the pressure and found 2800 psi using a new 2506 nozzle (after 200 ft of hose) I checked the bypass line at the tank and no water was flowing back to the tank when the gun was open. I have read that a properly adjusted Green spring unloader will have no flow in the bypass line when the trigger is pulled ( I have only used K7 unloaders) is this true?
 
HighTide said:
Does anyone else sell them as that is the only part I need to order?
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I'd send you one or two in an envelope by mail. General Pump part # 701013 will also fit. It's the o ring that goes under the piston in a TT series pump.


mike barrett said:
I have read that a properly adjusted Green spring unloader will have no flow in the bypass line when the trigger is pulled ( I have only used K7 unloaders) is this true?
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Yes. Trapped pressure or regulating (with full flow out the gun) should not bypass, K5, K7, ZK1 all require 5% bypass.
 
810f250 said:
Ahh! David you did not tell us this!

That may be the problem, you may not have adjusted the new unloader enough to get 3500psi on the head.
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Nigel, after replacing original unloader with green spring one several months ago (maybe a year now), the unloader was adjusted by my local mechanic who works on lawnmowers and pressure washers. It has not been adjusted since. It is possible that he adjusted incorrectly.
 
HighTide said:
Nigel, after replacing original unloader with green spring one several months ago (maybe a year now), the unloader was adjusted by my local mechanic who works on lawnmowers and pressure washers. It has not been adjusted since. It is possible that he adjusted incorrectly.
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He should have tested with a pressure guage before the unloader. Find out if he did that and what was the head pressure then. (Get yourself a guage so you know what your working with/ or assist in diagnosing problems)
 
Mike V said:
Russ....
Out of curioisty, what is your recommendation on unloaders?
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Inexpensive, yet reliable - Pulsar VB280


Willing to take a beating - YU2140 (the green spring unloader) or Giant 22913A


Flow controlled - K7 with a one size smaller bypass orifice.
 
810f250 said:
He should have tested with a pressure guage before the unloader. Find out if he did that and what was the head pressure then. (Get yourself a guage so you know what your working with/ or assist in diagnosing problems)
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Nigel, he did not test the psi at the pump from my understanding many months ago (I don't have a pressure washer expert nearby as he is small engine repair guy). I did test the psi again today before going into any hose (right out of heater coil) and the psi increased from 2800 to 2900, so I am not losing that much psi from my hose apparently.

I did talk to Bob at PT today and he suggested increasing the rpm on my vangaurd to see if that increases the psi (as my throttle may have vibrated lower over the many months). Will try that tomorrow as I will need some help on that one. I installed a brand new BE swivel today and my SC is getting 2,800 psi before entering the SC gun. I will rebuild my old swivel next week. I will not adjust my YU2140 (the green spring unloader) until I get someone (someday) to test my psi at the pump head as there really isn't anyone nearby that I know of that can do that. I also got out a new pressure gauge and retested everything with the same results.
 
HighTide said:
I will not adjust my YU2140 (the green spring unloader) until I get someone (someday) to test my psi at the pump head as there really isn't anyone nearby that I know of that can do that. I also got out a new pressure gauge and retested everything with the same results.
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David, testing pressure at your pump head is not hard. Does the gauge have a q.c. and plug on it? That will make it easier so you can take it on and off.

Snap it on the output of the pump and see what it reads with the machine running and the gun closed.
Then you can set the pressure from there.
 
HighTide said:
Nigel, he did not test the psi at the pump from my understanding many months ago (I don't have a pressure washer expert nearby as he is small engine repair guy). I did test the psi again today before going into any hose (right out of heater coil) and the psi increased from 2800 to 2900, so I am not losing that much psi from my hose apparently.

I did talk to Bob at PT today and he suggested increasing the rpm on my vangaurd to see if that increases the psi (as my throttle may have vibrated lower over the many months). Will try that tomorrow as I will need some help on that one. I installed a brand new BE swivel today and my SC is getting 2,800 psi before entering the SC gun. I will rebuild my old swivel next week. I will not adjust my YU2140 (the green spring unloader) until I get someone (someday) to test my psi at the pump head as there really isn't anyone nearby that I know of that can do that. I also got out a new pressure gauge and retested everything with the same results.
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Like Chad mentioned its no that hard. I am willing to bet $0.02 that if the small engine mechanic installed a new unloader without a guage that the unloader needs the proper adjustment. I hope you dont overspeed you engine.

There is an assumption you can make, and possibly rectify you problem, but you have to be experienced, comfortable with in yourself and know your machine and the conditions under which it has been operated to do it.
 
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