Turning a direct drive into a belt drive.

Weinersnitzelz

Weinersnitzelz

New member
I have an old 13 hp direct drive 3500 4gpm pw, just wondering if anyone has ever retrofitted a direct drive into a belt drive before. I assume that you would have to fabricate a bracket for the pump. But it seems like if you buy the parts (pulleys, belts etc..) it should work just fine.

Just curious.




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All the direct drives I've owned had hollow shafts, not sure how you'd attach a pulley?? Even if you could, you would have to run the RPM's the pump requires to get PSI/GPM. You would essentially have to run engine pulley and pump pulley of the same diameter, so the benefit of running an "actual" pulley driven pump wouldn't exist,...aside form the heat being further away from the pump. Other than that, I don't see the benefit,...plus it would take up more room with no benefit over the direct drive as it is.

I agree though, Russ is the guy to ask.

Jeff
 
814jeffw said:
All the direct drives I've owned had hollow shafts, not sure how you'd attach a pulley?? Even if you could, you would have to run the RPM's the pump requires to get PSI/GPM. You would essentially have to run engine pulley and pump pulley of the same diameter, so the benefit of running an "actual" pulley driven pump wouldn't exist,...aside form the heat being further away from the pump. Other than that, I don't see the benefit,...plus it would take up more room with no benefit over the direct drive as it is.

I agree though, Russ is the guy to ask.

Jeff
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Didn't even catch that, yeah you would need a pump with shaft. Can't use a direct drive pump.
 
Jeff, most engines in the 13 hp range are 3600 rpm most belt drive pumps require around 1400-1600 rpm so the point of the pulley is a reduction of rpm, small pulley on the engine larger pulley on the pump. How would this be different than a traditional belt drive set up?


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I'm talking about buying a pump made for belt drive. Like a replacement pump and retrofitting it. Basically use the engine that I have for a new belt drive pump. Sorry I wasn't clear on that.


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The reason I ask is because the pump on my 13hp is shot and instead of replacing it with another direct drive pump just convert it to belt drive with a belt driven pump.


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Weinersnitzelz said:
Jeff, most engines in the 13 hp range are 3600 rpm most belt drive pumps require around 1400-1600 rpm so the point of the pulley is a reduction of rpm, small pulley on the engine larger pulley on the pump. How would this be different than a traditional belt drive set up?


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The difference would be the design of the pump itself. Pumps are engineered to run a certain RPM to achieve rated RPM/GPM. I think if you want to try a running your pump as it is at 1400-1600 RPM, just idle it down to just under half throttle and see what happens to your PSI and flow.
 
Weinersnitzelz said:
I'm talking about buying a pump made for belt drive. Like a replacement pump and retrofitting it. Basically use the engine that I have for a new belt drive pump. Sorry I wasn't clear on that.


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Oh, ok,..that clears it up. Yea, a proper pump with proper pulley sizes and even a base unit can be had from one of the vendors here. The 13 HP will be fine.

Jeff
 
814jeffw said:
Oh, ok,..that clears it up. Yea, a proper pump with proper pulley sizes and even a base unit can be had from one of the vendors here. The 13 HP will be fine.

Jeff
Click to expand...

Yeah, that was my fault. I'm typing this on my phone and forgot to mention that little detail! Lol


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Which vendor would you guys recommend for doing something like this?


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You still have a pump with smaller pistons that has to turn at the same rpm as originally designed to get the pressure and gpm. Pumps that are designed for belt drives with lower rpm's have larger pistons. Sell it and buy you a 8 gpm pump rig.

Sorry. Nevermind. I didn't read all the above about getting a belt drive pump. Still I'd just go with a new pump and motor.
 
I would love to go with an 8 gpm setup, just low on cash. Lol


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I turned a 4 GPM 4000 psi direct drive into a 7 GPM 2000 PSI machine. Not extremely difficult with a gearbox, which works just as well as a belt drive.

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