Transmission Hard To Shift

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olgreyhair
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Transmission Hard To Shift

Postby olgreyhair » Wed Nov 18, 2015 10:31 am

Hello all. I have a new to me Cub that I'm trying to learn the ropes with. My question concerns difficulty shifting. If I idle the engine down I can shift all gears easily but if the engine rpm is up the transmission practically refuses to go in or out of gear. I don't want to bend the shift forks by forcing it. Is this normal behavior? Easy shifting while idling and difficult with rpm? Thanks for your time. G

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Re: Transmission Hard To Shift

Postby cub.bub » Wed Nov 18, 2015 11:29 am

Welcome!
I'm not an expert like so many others are on here, but I would first look at adjustments, like clutch peddle free travel, and adjustment of clutch fingers.
If you have a manual it will show you, or you can type in a "search" at the top of page and will get you started.
My guess is the pedal free travel. Good luck.
Bruce.

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Re: Transmission Hard To Shift

Postby Eugene » Wed Nov 18, 2015 12:32 pm

Clarify "hard shifting". Do the gears grind or is it physically more demanding to shift gears?

If the gears are not grinding at high idle, then the problem is in the transmission.
I have an excuse. CRS.

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Re: Transmission Hard To Shift

Postby Tiller1940 » Wed Nov 18, 2015 2:59 pm

If I'm wrong correct me but my owners manual says it should be adjusted so it has about 1 inch of free clutch travel.

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Bill Hudson
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Re: Transmission Hard To Shift

Postby Bill Hudson » Wed Nov 18, 2015 3:41 pm

Tiller1940 wrote:If I'm wrong correct me but my owners manual says it should be adjusted so it has about 1 inch of free clutch travel.


1" of free travel is correct.

Bill
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Re: Transmission Hard To Shift

Postby tst » Wed Nov 18, 2015 7:00 pm

if you can shift the transmission with the engine off then the clutch is not releasing to allow it to shift when running

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Re: Transmission Hard To Shift

Postby randallc » Thu Nov 19, 2015 6:03 am

Welcome to the forum from Arkansas. And while you are at it, service the transmission if you have not already. May be full of crud but the clutch is the likely culprit.
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Eugene
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Re: Transmission Hard To Shift

Postby Eugene » Thu Nov 19, 2015 8:24 am

olgreyhair wrote:I have a new to me Cub. Easy shifting while idling and difficult with rpm?
Still waiting for an explanation of "hard shifting" before we condemn the clutch or pilot shaft bushing.

Is the tractor in motion when trying to shift gears? Is the PTO engaged and the mower in motion when trying to shift gears? Do the gears grind at low engine idle?

Unlike a manual transmission in a car or truck, the Cub tractor operator has to wait until everything, forward motion and/or engaged pto, stops before shifting gears.
I have an excuse. CRS.

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Re: Transmission Hard To Shift

Postby John *.?-!.* cub owner » Thu Nov 19, 2015 10:15 am

First off, older tractor transmissions do not have synchronizers, so they take lots of practice to shift on the fly. If it grinds gears while stationary you probably have a clutch out of adjustment, a bad throw out bushing, or a bent main transmission shaft. If the shift leaver is hard to move, then you will need to take the top off the transmission and see why.
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Re: Transmission Hard To Shift

Postby olgreyhair » Thu Nov 19, 2015 3:19 pm

Thanks for the welcome.
Hard to shift as in the gears grind if the engine rpm is too high. Tractor is stopped, no pto engaged.
As long as I idle it down it seems to go in and out of gear fine. We just bought the property and I haven't had time to service the poor thing at all, but she came with the house. Original owner built the house in '47, and bought this Cub in '52. She's lived her whole life on this land, so I think it's only fitting to spruce her up when I can.

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Re: Transmission Hard To Shift

Postby pickerandsinger » Thu Nov 19, 2015 3:26 pm

olgreyhair wrote:Thanks for the welcome.
Hard to shift as in the gears grind if the engine rpm is too high. Tractor is stopped, no pto engaged.
As long as I idle it down it seems to go in and out of gear fine. We just bought the property and I haven't had time to service the poor thing at all, but she came with the house. Original owner built the house in '47, and bought this Cub in '52. She's lived her whole life on this land, so I think it's only fitting to spruce her up when I can.
…..Most of mine require a slow count to 7 for them to shift without grinding….Of course that is at a stop… :lol: Dave
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Re: Transmission Hard To Shift

Postby Eugene » Thu Nov 19, 2015 4:02 pm

pickerandsinger wrote:.Most of mine require a slow count to 7 for them to shift without grinding….Of course that is at a stop… :lol: Dave
My Cubs, upon engine start up, require a pause after depressing the clutch pedal to shift without grinding gears. If the tractor had been moving or the PTO engaged I have to wait until everything stops before shifting gears. Just the way the tractor was constructed.

You may still have a problem with the clutch operation or the pilot shaft bushing, but try pausing for 5 to 10 seconds before shifting gears.
I have an excuse. CRS.

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Re: Transmission Hard To Shift

Postby Scrivet » Thu Nov 19, 2015 11:46 pm

With the PTO engaged it is spinning at the same speed as the drive shaft through the transmission. You can get an idea of how long, or even if, the driveshaft takes to slow down or stop by watching it as you depress the clutch. As has been said not really designed for shift on the fly. More like; stop, idle down, pause, select different gear, idle up, release clutch and go.

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Re: Transmission Hard To Shift

Postby olgreyhair » Mon Nov 23, 2015 1:59 pm

Thank You for all the reply.
" stop, idle down, pause, select different gear, idle up, release clutch and go." Explains it perfectly. I guess I'm good to go. Looking forward to doing a full service/tune up on the old girl. Reading the manual, it sounds like a full 12 pack just to oil every bearing cup, generator bearing, fan hub etc. etc.
They sure don't make em like this anymore.

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Re: Transmission Hard To Shift

Postby Matt Kirsch » Mon Nov 23, 2015 2:13 pm

You may be in the early stages of the pilot bushing in the center of the flywheel, starting to hang up on the transmission input shaft.

There's really not much you can do about that problem without major surgery. In other words, splitting the tractor and replacing the pilot bushing. Be warned once that hood comes off, the "may as well do this while the hood's off" jobs, aka "may as well's," come fast and furious. You have to exercise good self control of you can drop the better part of $2500 by the time the dust settles.

If the transmission stops grinding when you give it a few seconds to calm down, it's not something that needs to be addressed immediately. I would wait until it got intolerable.


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