|03-30-2009, 04:02 PM||#16|
Senior MTF Member
Join Date: Jan 2009
Location: New York
MTF Member # 21690
Re: Oliver OC-3 crawler
I designed what I regard as a better setup. Specs to my setup have been posted for years at Cletrac.org. And, some guy came to my home, got some specs, took photos, did his own improvements and published something that's probably better written than mine.
No matter how you do it, the key is getting a Ford three-speed trans from a Model A. I've bought many for $50 or less. I've also found many laying in farm fields that I got free. The issue is - the OEM Clark transaxle in the HG and OC3 has an odd-ball shaft and spline size at 1 3/16". The only things on the planet that matches - that I know of - is the output shaft of the Ford Model A trans. Matches perfectly so the driveshaft parts fit fine.
I've built several, and all I've done - I used the original clutch housing and adapted a mounting plate to it so the Ford trans fits on. I also modified the driveshaft so it comes part and out easily.
With the Ford Model A 3 speed transmission installed as an auxillary unit, ground speeds at full throttle are as follows:
Original: 1st - 2.01 m.p.h., 2nd - 3.19 m.p.h., 3rd - 5.24 m.p.h., Rev. - 2.33 m.p.h.
Range 1: 1st - .64 m.p.h., 2nd - 1.02 m.p.h., 3rd - 1.68 m.p.h., Rev. - .74 m.p.h.
1st - 1.08 m.p.h., 2nd - 1.72 m.p.h., 3rd - 2.83 m.p.h., Rev. - 1.26 m.p.h.
Range 3: 1st - 2.01 m.p.h., 2nd - 3.19 m.p.h., 3rd - 5.24 m.p.h., Rev. - 2.33 m.p.h.
Range Rev.: 1st - .53 rev. m.p.h., 2nd - .85 rev. m.p.h., 3rd - 1.4 rev. m.p.h., Rev. - .62
Actual reduction is 2.6 in 1st, 1.6 in 2nd. and 2.2 in reverse.
Compared to a John Deere 420 crawler:
1st - 7/8, 2nd - 2 1/4, 3rd - 3, 4th - 5 1/4
OC-4 (with hi/lo in high range) 1st - 1.5 m.p.h. 2nd - 2.4 m.p.h. 3rd - 3.3 m.p.h. 4th - 5.2
m.p.h. rev. 1.8 m.p.h.
OC-4(with hi/lo in low range) 1st - .8 m.p.h. 2nd - 1.2 m.p.h. 3rd - 1.7 m.p.h. 4th - 2.7
m.p.h. rev.-.9 m.p.h.
The picture with the yellow trans and housing is the original Trasco kit Oliver sold. They often sell for over $1000 when available.
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