Re: F-12/F-14 conversion

Posted by LenNH on December 07, 2009 at 17:35:03 from (71.192.137.159):

In Reply to: F-12/F-14 conversion posted by Seth Boyer on December 06, 2009 at 12:30:04:

I have in front of me two IHC brochures from the 30s.
For the F-14, ground speeds are listed as 2-1/4, 3 and 3-3/4 mph.
PTO speed is 550 rpm.
Belt speed is 2580 feet per minute.

F-12 ground speeds are the same.
PTO rpm is 538.
Belt speed is 2591 feet per minute.

These are all very close. I don't think there was a standard PTO speed back then, but most manufacturers seemed to make their PTO speeds around the 540 mark. As to belt pulley speed, there must have been some sort of bench mark there, too, because all the tractors listed in one of my IHC brochures have pulley speeds
just under or just over 2600 feet per minute. I expect that most driven machines (threshers, for example) were designed to be driven by tractors with those belt speeds.

I THINK that the way that engine speed was increased while ground speeds and the pulley and PTO speeds were kept about the same was via a change in the ratios at the input to the transmission. It is not clear how the ground speeds would remain the same while the PTO and pulley were slightly different. I wouldn't be surprised if the published speeds don't match up exactly with the real speeds, which would be just very slightly different (there is about a 1 to 1.5% difference in the PTO and pulley speeds). I would be glad if someone who knows these things better than I do would say whether or not this is true.

The governed engine speed on the F-14 was raised from 1400 to 1650. This could have been done with
some adjustments to the various levers involved, but possibly also with different springs. Again, I hope people who have first-hand experience with these things will reply.

The external changes--higher seat, raised steering wheel, longer brake levers, longer clutch pedal, higher throttle bracket, valve-cover breather--were basically bolt-ons (except for the u-joint in the steering--unless the changeover kit contained a complete steering shaft with u-joint and worm--this I don't know). When I was a young whippersnapper, I made a DIY conversion to a higher steering wheel and raised seat (raised the seat with a block of wood; for the steering, got a B u-joint and put it on the shaft after I cut it in two; I don't remember how the joint was fastened to the shaft; this was about 65 years ago--just long enough so that the details are now just a LITTLE bit fuzzy).
By the way, users were advised back then to take the pulley off when it wasn't being used. Since it was heavy and ran all the time, it was probably somewhat hard on the pulley shaft bearing. We didn't use ours that much, so the little cover was always kept on the shaft, to keep dirt out of the bearing.

Replies:

• Re: F-12/F-14 conversion ET 05:24:42 12/08/09 (1)
  • Re: F-12/F-14 conversion Dal Wolf 13:04:11 02/01/10 (0)

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