ground speed for H and M

Charlie M · Dec 12, 2012

Did the H and M's have the same gears in the transmission when they were made. I know the suppers had faster ground speeds. I have a 43 H and a 43 M and the M is a lot faster in all gears. I'm wondering if the gears in the M were changed out at one time.

CNKS · Dec 12, 2012

Without looking up the speeds, the gears are different because of the tractor size. But, the speeds are very close to each other. There were 7 mph 4th gears available for each or about 2 mph faster the the usual 5 1/8. The gears in either tractor can be changed to those used in the Super Series which have faster 2nd, 3rd and 4th, in particular 3rd and 4th. Check the tire size on both, that will make a difference. The final drive or differential gears can be exchanged with the W4 and W6, which results in faster speeds (I think) in all gears.

DeltaRed · Dec 12, 2012

Other things can factor in ground speed.Tire size;Does the H ave under size tires,Does the M have oversize?Engine speed;Is the H running at full rated RPM?vIs the M over speeded?My SH(12.4x38) and SM(13.6x38) are exactly the same speed in 3rd gear.Iwould suspect 5th is similar.

DeltaRed · Dec 12, 2012

A lot can happen to a tractor in 70 years....

Charlie M · Dec 12, 2012

Both tractors have same size tires - I'm thinking the gears in the M have been changed - maybe to super M gears. I like the ground speed better on the M anyway - H seems a bit slow to me.

ejr-IA. · Dec 12, 2012

Theirs 200 rpm diference between the two tractors the non supers had the same speeds in both tractors in the supers were the same untill 4th in the SM.If you got the XIL code that was a low low and a 7mph 4th.

davediehl@hotmail.com · Dec 12, 2012

My 49 H runs 19mph at full throttle. I passed one of those speed signs the police put near a school one day. Answered my question in a hurry.

oldtanker · Dec 12, 2012

(quoted from post at 10:35:06 12/12/12) My 49 H runs 19mph at full throttle. I passed one of those speed signs the police put near a school one day. Answered my question in a hurry.

Mine runs 17 according to my GPS. I clocked it the other day when a buddy used it and I played chase car to his place and back.

RIck

Zachary Hoyt · Dec 12, 2012

I put Super H gears in my H and liked the new speeds much better. The 300 seems to be about the same speeds as the Super H, more or less.
Zach

CNKS · Dec 12, 2012

"--the supers were the same untill 4th in the SM"

The Supers were close to the same until THIRD gear, 5 mph as opposed to a little over 4 in the H and M. 4th was 6+, 2nd was a little faster also.

David G · Dec 12, 2012

My 50 H runs along at 19 MPH with 12.4 tires.

D Slater · Dec 12, 2012

Looked through a old notebook where I done some math in the past. Easy to make a mistake on the all the numbers. So if something doesn't look right say so. Regular gears.
For H tractor at 1650 RPM and a M at 1450 RPM. Both equiped with the same 13.6 tires.
gear H MPH M MPH
1 2.67 2.68
2 3.64 3.55
3 4.33 4.36
4 5.46 5.28
5 16.69 16.68

60 acre hillside · Dec 13, 2012

And engine speed has been tinkered with. My M is way slow but does ok but I will change when I need to. When I got it it was running too fast.

ground speed for H and M

Charlie M

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CNKS

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DeltaRed

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Charlie M

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ejr-IA.

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