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Farmall & IHC Tractors Discussion Forum

pto trouble need help

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1468 farmer

10-19-2004 13:25:28

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i have a 1468 that came from the factory without a pto i put one out of a 856 i was told 1000 rpm when i put it on the dyno they couldn't get a accurate reading because the rpms weren't right they told me that the 1468 had the wrong gear i guess i'm wondering if 1468 had different pto gears this is the one the tractor came with thanks

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K.B.-826

10-19-2004 19:34:13

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Re: pto trouble need help in reply to 1468 farmer, 10-19-2004 13:25:28

Sounds like you've got the dyno running off of the 1000 RPM shaft, right? What does the tach on the dyno say running full throttle no load? Under this condition, you should have considerably more than 1000 RPM, more like 1200 somthing. Record that speed and get back to me. Now, load the engine down to rated speed , which is 1159 PTO RPM on 95% of the big IH's, I'd have to double check on the 1468. Take your horsepower or torque reading at this speed. Now, lets back up a second. The gear reduction for the live power shaft is made by the two gears mating the shaft out of the engine clutch pressure plate to the live power shaft, which are located at the very front of the speed transmission. The live power shaft drives the 1000 RPM PTO shaft directly. When IH sped up the engines for the 66 series, they lowered the ratio of those two gears to compensate for the faster engine speed, which means that the live power shaft on an 856 turns at the same speed as a 1468. The gears in the PTO unit are just the idlers that reduce the speed of the live power shaft down for the 540 shaft. Your PTO unit is not the problem, either the engine is not running at the correct high idle speed, or the dyno operator is the problem.

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1468 farmer

10-20-2004 06:28:32

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Re: pto trouble need help in reply to K.B.-826, 10-19-2004 19:34:13

K.B-826 thanks for your help.The 1468 has a single 1000 rpm shaft.When you bring the 1468 engine up to 2836 rpms like the M&W book says the tach on the dyno is buried . We double checked the engine rpms with a hand tach it is within 20 rpms. I have had my other 1468's on this dyno with no problems but, they all came with pto's thanks

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K.B.-826

10-20-2004 19:13:50

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Re: pto trouble need help in reply to 1468 farmer, 10-20-2004 06:28:32

Your high idle speed seems right. Problem's got to be in the dyno. Can't be the PTO unit. Try measuring it's speed with a hand-tach.

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K.B.-826

10-20-2004 19:22:06

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Re: pto trouble need help in reply to K.B.-826, 10-20-2004 19:13:50

This might seem like a stupid question, but when you dyno'ed the other 14's, were you running off of the 540 shaft? Are you trying to run this 14 on a dyno designed for 540 RPM using an adapter?

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1468 farmer

10-21-2004 06:31:12

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Re: pto trouble need help in reply to K.B.-826, 10-20-2004 19:22:06

K.B.-826 thanks again for your input. I ran the other 14's onthe 1000 rpm shaft. My mechnic went and got one of my other 14's put on the dyno pulled down had 202 to 206 hp everything worked fine. This is where it was running last year.We are wondering about this gear to gear you talked about in your 1st post where the pto drive shaft and drive gear come together. we have been told this is where the problem is, that IH made a couple different gears making the shaft turn faster than it should is this possible? thanks again

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K.B.-826

10-21-2004 20:02:20

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Re: pto trouble need help in reply to 1468 farmer, 10-21-2004 06:31:12

The gear off of the shaft out of the pressure plate mates to the live power shaft drive gear, creating the reduction needed to reduce the engine's speed down to PTO shaft speed. IH did make several different gear sets, depending on the rated engine speed of the tractor. I belive there was one set for early gas tractors rated at 2300 RPM, another for 06, 26, 56, and early 66/68 series diesels, which were rated at 2400 RPM, and another set for late 66/68, and 86 series diesels, which were rated at 2600 RPM. The reason being that they wanted the PTO to be turning at about the same speed at rated engine speed from tractor to tractor. Do you know anything about the history of the tractor? Has it ever had the Speed Transmission apart? I remember you said it runs about 2800 wide-open, which means it is rated at 2600. If someone put gears for a 2400 RPM tractor in there, your PTO would turn faster than it should. Check your PTO RPM's with a hand-tach. If you have an adapter to run 540 implements off of the 1000 shaft, hook one 14 to a small-square baler, run it at about 1000 engine RPM's, and count the plunger strokes per minute. Now hook on the 14 that is bothering, run the baler at the same engine speed and count. We'll get to the bottom of this.

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Missouri Boy

10-19-2004 17:41:13

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Re: pto trouble need help in reply to 1468 farmer, 10-19-2004 13:25:28

I think all IHC pulleys had "Spokes"

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Missouri Boy

10-19-2004 17:42:50

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Re: pto trouble need help in reply to Missouri Boy, 10-19-2004 17:41:13

Sorry but this was for another post

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Novel Idea Guy

10-19-2004 14:08:54

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Re: pto trouble need help in reply to 1468 farmer, 10-19-2004 13:25:28

if you find this reply hard to read its probably because i didnt use any capitalization or punctuation now i know that most people arent exactly rhodes scholars and that complaining about grammer is just plain petty but your question was really difficult to read because it didnt have any punctuation or capitalization and im not really sure what youre trying to ask people say that not using correct grammar and punctuation is okay as long as the message gets across well the message isnt getting across i seriously dont know what youre trying to ask im not asking that you use perfect grammar or get it exactly right but a little effort to make your post more readable even hitting the return key once in a while wouldnt hurt a bit and youd probably get more responses anyway back to what i think is your question it seems silly to me that the pto gear would be different on a 1468 especially since the pto wouldnt fit anymore i think the guy with the dyno is full of crap

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Allan in NE

10-19-2004 14:21:19

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Re: pto trouble need help in reply to Novel Idea Guy, 10-19-2004 14:08:54

yeahmetooifeelthesameway

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