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  #1  
Old 08-04-2014, 03:13 PM
chrngoe chrngoe is offline
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Angry 1650 transmission problem
I have a 1650. The transmission will not hold a constant speed on upgades/ downgrades. It slows when goin up hills and speeds up on down hills so that you are always on the speed control lever trying to maintain a constant speed. If you hold the speed control lever at a certain position and drive up hill it will slow and as you peak the hill and start down it will speed up so it is apparently slipping, although on level ground it seems very responsive (no slip) Any ideas/suggestions? Can these Sundstrand units be rebuilt? Cost?
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  #2  
Old 08-04-2014, 04:31 PM
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jimbob200521 jimbob200521 is offline
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Common issue, easy(ish) fix.

http://www.onlycubcadets.net/forum/s...ead.php?t=4635
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Old 08-04-2014, 11:28 PM
Yosemite Sam Yosemite Sam is offline
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Welcome to OCC.

Please keep in mind that a hydro transmission is not the same as a cruse control.

The hydro transmission is very much like any other type of hydraulic equipment, they will stay at pretty-much a constant speed on the flat and level. But, just like the difference between lifting a light load or a heavier load with a front end loader, you need more "lever" for the heavy load and less for the light, same way with the hydro trans. more lever to pull a hill and less to go down (to maintain a steady speed).
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Old 08-04-2014, 11:40 PM
Rdrnek Rdrnek is offline
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Originally Posted by Yosemite Sam View Post
Welcome to OCC.

Please keep in mind that a hydro transmission is not the same as a cruse control.

The hydro transmission is very much like any other type of hydraulic equipment, they will stay at pretty-much a constant speed on the flat and level. But, just like the difference between lifting a light load or a heavier load with a front end loader, you need more "lever" for the heavy load and less for the light, same way with the hydro trans. more lever to pull a hill and less to go down (to maintain a steady speed).
I second this... my first cub was a 149 and i was thinking exactly what you are thinking now, but it is normal operation. I live in a very hilly part of Pennsylvania. If you want to waste a bunch of money and drive yourself crazy go ahead. (I know I did)
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Old 08-05-2014, 12:01 AM
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olds45512 olds45512 is offline
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I second this... my first cub was a 149 and i was thinking exactly what you are thinking now, but it is normal operation. I live in a very hilly part of Pennsylvania. If you want to waste a bunch of money and drive yourself crazy go ahead. (I know I did)
theres a line between normal operation and worn parts, he should at least check for wear before assuming its just normal.
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  #6  
Old 08-05-2014, 01:31 AM
Yosemite Sam Yosemite Sam is offline
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theres a line between normal operation and worn parts, he should at least check for wear before assuming its just normal.
By all means take the tunnel cover off and check the trunion for wear, misalignment and it's movement, I would if it were mine, especially if you feel there is any kind of possible danger to yourself or others.

However the OP clearly states that he isn't experiencing any problems on level ground (apparently no hydro creep or run away) and he doesn't even hint at any kind of lurch or other erratic behavior.

Other than these basic problems, what else is there?
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Old 08-05-2014, 06:15 AM
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Cubcrazy Cubcrazy is offline
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Originally Posted by chrngoe View Post
I have a 1650. The transmission will not hold a constant speed on upgades/ downgrades. It slows when goin up hills and speeds up on down hills so that you are always on the speed control lever trying to maintain a constant speed. If you hold the speed control lever at a certain position and drive up hill it will slow and as you peak the hill and start down it will speed up so it is apparently slipping, although on level ground it seems very responsive (no slip) Any ideas/suggestions? Can these Sundstrand units be rebuilt? Cost?
Welcome to OCC! As the others have stated sounds like normal hydro behavior but you could pull the tunnel and check the trunnion for wear.
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Old 08-05-2014, 03:19 PM
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My experience is with new trunnion springs and a new "square" on the trunnion arm, speed control is MUCH improved, nearly to "cruise control" standard. The problem described by the OP is very common on tractors with weak springs and worn trunnions. Fix the trunnion, and properly adjust the control lever friction, and take up any slop in the control/cam plates and you'll see much more consistent speeds.
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Old 08-05-2014, 05:09 PM
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How about simply changing fluid and filter first? Start simple and then look deeper if that doesnt help. Just my
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Old 08-05-2014, 06:48 PM
yeeter yeeter is offline
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How about simply changing fluid and filter first? Start simple and then look deeper if that doesnt help. Just my
I had one that wouldn't even move forward. Fluid/filter change and it worked excellent!

If you aren't sure the last service, I would do hat first.

Trunion second, but also worth doing if worn.

Maybe just plan on doing both.
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