PTO speed

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Jan 19, 2009 | 11:11 PM

KJLYPW

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From: Powell River B.C.

PTO speed

My 48 f68 has a PTO off the tranny that drives a pump for the lift bed. Not running at this time. Can anyone tell me the ratio that the PTO turns in relation to engine speed? I'd like to use this pump on another application so how fast it needs to run would be helpful information. Thanks

Jan 20, 2009 | 07:48 AM

hellbound_redneck

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From: Petaluma, CA

hopefully someone that knows will be along shortly.

Jan 20, 2009 | 07:51 AM

HOTWRENCH

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From: saxton pa.

PTO Speed

Pto speed is determined by the driven gear in the Pto box. It can be over or underdriven. If there is a tag on your Pto it will have numbers that will decode the ratio. If it does'nt have a tag pull the shaft off and use a hand held tachometer to get the RPM at idle speed and compare it to engine RPM. This will give you the % of over or under drive. Most older units were 50 to 80% under. The old single gear units you didn't have much of a choice in ratio's. The 2 gear units were heavier and better in ratio availability.

Have A Good Day-----Hotwrench

Jan 20, 2009 | 04:45 PM

panningbros

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I agree. There were several ratios available depending on what the PTO was used to drive. Most PTO's that drove grain box hoists did not turn very fast especially when the engine was idling. It doesn't take near as much hydraulic flow to run a couple of smaller cylinders. It takes a lot more to run an orbital motor or larger cylinders. If your truck doesn't run it will be hard to check. Probably the easiest is to drop it off and count teeth.

Jan 20, 2009 | 06:01 PM

KJLYPW

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From: Powell River B.C.

Thanks for the answers guys, a buddy is going to make a dump trailer for behind is old tractor, has two PTO speeds avaialble, sounds like either will work fine for this application. My old tranny looks like a ball of dirt at this point, so will figure out a use or not for the PTO once I get that far. It may become for sale down the road if someone is interested they can PM me. Thanks again, Kevin

Jan 20, 2009 | 06:51 PM

fabmandelux

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From: Paradise Found!

The PTO's on our wheat trucks run 500 rpm at 1,500 engine rpms if it's any help.

Jan 20, 2009 | 07:20 PM

husker

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From: Manhattan, KS

Chances are the tractor has 540 and 1000 rpm available. My guess based on fabmandelux's post is that he would want to use the slower speed. Old tractors used the 540 pto as pretty much standard up until sometime in the late 60's or early 70's and then usually had both the 540 and 1000 rpm available. The PTO speed was at the engine's normal operating speed. i.e. somewhere around 1800 rpm on a diesel.

My experience is from years ago, so newer stuff may have other options.

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Jan 21, 2009 | 08:21 AM

panningbros

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The slower 540 speed will be fast enough. I've seen this done before. You will need to retain the transmission only for the reason to hold the PTO. These truck PTO units are not self contained and use the transmission oil for lube. You need to couple your tractor to the input shaft of the transmission. Just leave the trans in neutral and make sure it has oil in it for lube. Ideally you should support the front of the transmission shaft somehow, like the flywheel pilot bearing used to. If you don't support the front of the shaft it will have too much up and down play and the bearing and seal will fail before too long. Also you will have to support the entire transmission since the motor will be gone. (I assume the motor will be gone ?) Plan B :: Does his tractor have decent hydraulics? Just run hydraulic hoses from the tractor to run the lift cylinders and eliminate the trans/PTO completely.