Replacing pump to increase GPM

EcoClean

EcoClean

New member
I found a great deal on one of the Northstar hot water skids that has a Honda gx610 (18 hp) engine and a cat 4.0 gpm at 4000 psi direct drive pump on it.

Are there any options as far as increasing the GPM by replacing the pump? While I'm at it, I'd love to upgrade the pump to a belt driven. I don't mind reducing my pressure to 3000, maybe even a little less if theres a big enough gain in GPM.
 
The pump can be swapped out for more gpm. You could go 5.5 @ 3,500 with the 18 hp. Putting a belt driven pump on would be dictated by the machine configuration unless you're willing to do some fabricating work. I can get a direct drive 5.5 gpm pump if you want to make the switch.
 
Northstar hot water skids that has a Honda gx610 (18 hp) engine and a cat 4.0 gpm at 4000 psi direct drive pump on it.
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I have the same skid on one of our trucks and use it strictly for gum removal. It works great for that, and that cat pump is bulletproof. When the pump goes, I'll be switching it out for the 5.5, but until then, it gets used for gum.
 
Russ Johnson said:
The pump can be swapped out for more gpm. You could go 5.5 @ 3,500 with the 18 hp. Putting a belt driven pump on would be dictated by the machine configuration unless you're willing to do some fabricating work. I can get a direct drive 5.5 gpm pump if you want to make the switch.
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Thanks Russ.

5.5 gpm would be a huge improvement. However I'm pretty positive there is enough room to mount some brackets to hold a belt driven pump. I'd prefer the belt driven for the numerous benefits.

Feel free to give me a call when you're not too busy. 864-356-3010
 
offdutyfireman said:
I have a 16hp flowing 8 gpm. I would go belt drive and a 7.9 gallon Udor pump. Unless you are doing concrete, pressure doesn't clean, chemical and water volume does.
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Thanks for the reply William.

What kind of pressure are you getting with that 8gpm pump on a 16hp engine? Like you mentioned, I'm affraid if I go with a pump like 7.9 gpm I won't be as effective with concrete, which I will be doing a fair amount of.

I think I may do like Russ suggested, a 5.5 @ 3500 belt driven.

I have a gx390 (13hp) that I may try to find a high GPM low PSI pump on and just use it for some softwashing jobs..

I was going to buy a 8gpm hot water skid before the Spring. But when I saw the northstar skid so cheap I figured I'd buy it and let it pay for the 8gpm skid in the future..
 
WeWashConcrete said:
Thanks for the reply William.

What kind of pressure are you getting with that 8gpm pump on a 16hp engine? Like you mentioned, I'm affraid if I go with a pump like 7.9 gpm I won't be as effective with concrete, which I will be doing a fair amount of.

I think I may do like Russ suggested, a 5.5 @ 3500 belt driven.

I have a gx390 (13hp) that I may try to find a high GPM low PSI pump on and just use it for some softwashing jobs..

I was going to buy a 8gpm hot water skid before the Spring. But when I saw the northstar skid so cheap I figured I'd buy it and let it pay for the 8gpm skid in the future..
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I have never owned a pressure gauge but it pushes a 16 inch eagle wash surface cleaner like crazy. About the only concrete we do is residential driveways and sidewalks at apartment complexes so I am by no means the authority on concrete. I would not hesitate one bit to put a 8 gpm pump on yours. All of my other machines are 25 horse kohlers but the 16 horse Briggs won't give up the ghost so I can replace it.
 
WeWashConcrete said:
Thanks for the reply William.

What kind of pressure are you getting with that 8gpm pump on a 16hp engine? Like you mentioned, I'm affraid if I go with a pump like 7.9 gpm I won't be as effective with concrete, which I will be doing a fair amount of.

.
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Micah, I think running an 8gpm pump with that motor youll only yield around 2200 psi. Just to give you an idea.

If it works great for William then I suppose it could for you to. I personally couldnt clean concrete with only that much pressure. I would have to use a roof wash strength solution to kill the mold/mildew on the concrete to make that work. Maybe thats what William does IDK.

If the majority of the concrete I cleaned wasnt that bad it probablly wouldnt be an issue.
 
If northern tool sold that same skid as a belt driven unit I would have 3 of them for KEC work right now but the direct drive turns me off. I also have a associate who had a HORRIBLE experience with their warranty work ( time it took and quality of work)
 
also the hose reels on those northern machines are total crap. I have seen 2 of those rigs in town and both have had problems with the hose reels
 
Somebody help me out here if I'm wrong..

According to General Pump's site, I could use a TSF2221 pump. It should give me 8.5 GPM at 3000 psi. It requires 17.5 hp.

http://generalpump.com/PDFs/TSF2019-Pump.pdf

Pulleys, a cage for the pulleys, and rails for the pump would be needed, but I think there is room for these.

How would 8.5 gpm affect the burner? It heats to 250, what kind of heat rise should I expect? Would a larger fuel nozzle be needed to get to 180 degrees?
 
That 17.5 horsepower is probably electric, you'll need about 1 1/2 times that for those specs. You can increase your fuel pressure, nozzle size or both but there's only so much flame you can fit in your burner. Get a fuel pressure gauge and a thermometer on the outlet so you can know what is going on.
 
Looked at the spec page and its BHP, brake horsepower, which is I think horsepower coming out of the ngine, no drive system. Anyways I think the accepted formula is gpm x pressure divided by 1000 or 1100, which is way off of the BHP on the general page. This other page at general lists some numbers for diesel electric gas hydraulic, near the bottom

http://generalpump.com/CustomerService/FAQs.asp
 
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