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Is first gear on a Cub always noisy?

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clm2112
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Tractors Owned: 1955 Farmall Cub
Location: Fayette City, Pennsylvania

Is first gear on a Cub always noisy?

Postby clm2112 » Sun Jul 24, 2016 11:49 am

This may sound foolish, but I've been wondering about this all my life...

My 55 Cub sounds horrible when it is moving in 1st gear. It just makes a really loud "whirrrrrr", like the gears are not meshed very well. It has done it for nearly 40 years and I don't see any metal flakes in the transmission oil. (It has only been my tractor for the past few years, but I've had occasion to drive it around the farm back when I was 10 years old... it made the same noises back then too.)

I'm just wondering if this is typical for the Cub transmission, 2nd and 3rd gears are quiet.

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Puffie40
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1939 Farmall H
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Re: Is first gear on a Cub always noisy?

Postby Puffie40 » Sun Jul 24, 2016 1:30 pm

It's probably what's called 'gear rollover noise'.

Nothing serious, just noise created in the transmission by the harmonic frequency of the engine crankshaft.

Spur gears are well known for being noisy. When to be concerned is if that noise gets really loud or it starts popping out of gear.

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clm2112
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Joined: Sun Jul 24, 2016 11:03 am
Zip Code: 15438
Tractors Owned: 1955 Farmall Cub
Location: Fayette City, Pennsylvania

Re: Is first gear on a Cub always noisy?

Postby clm2112 » Sun Jul 24, 2016 1:53 pm

Thanks, If it is common enough to have it's own name, then I'll just ignore it as best as I can. Fortunately the Cub spends most of it's current life pulling a two-wheel trailer around the farm, so I run it in 2nd and 3rd gear most of the time.

BigBill
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Re: Is first gear on a Cub always noisy?

Postby BigBill » Sun Jul 24, 2016 7:10 pm

Check the gear oil level in the finals. These are all straight cut gears.

I haven't tried it yet but in the 70 drag race cars in the four speed trannies we added a can of STP to the gear oil in the tranny. This cushioned the teeth on the gears when they meshed.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

SouthernOutlaw
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Re: Is first gear on a Cub always noisy?

Postby SouthernOutlaw » Mon Jul 25, 2016 3:00 am

We used to do the STP treatment also. The only problem with if is when it gets cold that STP will set up like cement in your transmission.

Clark Thompson
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Re: Is first gear on a Cub always noisy?

Postby Clark Thompson » Tue Jul 26, 2016 11:03 pm

were not noisy from the factory when new. Causes are miss aliened counter-shaft, bad bearings in drive-shaft, worn first and reverse sliding gear.
Collector of Farmall cubs and cub cadets.Injoy helping people keep their cubs running. Years of experipnce.

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clm2112
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Posts: 115
Joined: Sun Jul 24, 2016 11:03 am
Zip Code: 15438
Tractors Owned: 1955 Farmall Cub
Location: Fayette City, Pennsylvania

Re: Is first gear on a Cub always noisy?

Postby clm2112 » Wed Jul 27, 2016 5:15 am

Hmmm... perhaps after CubTug I'll have a better idea of just how abnormal the 1st gear noise really is by listening to other tractors running in 1st. It is quite possible 1st got abused early in the tractor's life (fields around here are full of sandstone chunks...probably the best crop that grows here are rocks.)

I don't think I'll dig into the transmission without having a second transmission on hand. I'm still traumatized from overhauling a GM 700R4 a few years ago ;)

Matt Kirsch
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Re: Is first gear on a Cub always noisy?

Postby Matt Kirsch » Wed Jul 27, 2016 9:59 am

It's always a debate of how noisy is "too noisy." Different people hear things differently, and innocuous to one is intolerable to another.

Being somewhere where you can hear other Cubs and see what others' opinions of the noise levels are will help immensely.

These transmissions are nowhere near as complex as a 700R4.


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