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BL5 vs BL4

Sun Feb 17, 2013 7:46 pm

If BL 5 is not recommended for the cub tranny, where can you find BL4?

Re: BL5 vs BL4

Sun Feb 17, 2013 9:01 pm

Manuals, top of page. See Operator's manual, Lubrication Table, for recommended lubricants.

Transmission: Hy-Tran fluid or equivalent - - or S.A.E 80 or 90 gear lub. Available at auto parts store, farm and ranch stores, tractor supply type stores, and big box stores.

Re: BL5 vs BL4

Sun Feb 17, 2013 10:13 pm

bzsz1942 wrote:If BL 5 is not recommended for the cub tranny, where can you find BL4?

Do you mean GL-4 & GL-5? These gear oils contain extreme pressure additives that are corrosive to yellow metals. Like Eugene suggested you should use Hy-Tran. Another option is GL-1, which is a straight mineral oil and compatible with yellow metals. But, good luck on finding any GL-1.......pretty scarce these days.

Re: BL5 vs BL4

Mon Feb 18, 2013 5:21 am

This may be a stupid question, but I don't know. What do you mean by yellow metals? I have been using Mystic HP 90 wt in my Cub tranny for several years. My Son-in-law has a brother who races around here, nd he said a lot of the racers use the Mystic oil in their differentials, and it eliminated troubles they used to have.

Re: BL5 vs BL4

Mon Feb 18, 2013 6:06 am

I can't think of a single brass part in a Cub transmission.

Re: BL5 vs BL4

Mon Feb 18, 2013 6:29 am

Sorry, I did mean GL4 and 5, not BL. Thanks for the responses. If there are no brass parts in the cub tranny, then I won't worry bout it.

Re: BL5 vs BL4

Mon Feb 18, 2013 7:02 am

bob in CT wrote:I can't think of a single brass part in a Cub transmission.


Reverse idler bushings.

Re: BL5 vs BL4

Mon Feb 18, 2013 7:56 am

bob in CT wrote:I can't think of a single brass part in a Cub transmission.
PTO pilot bushing is "brass". Does that qualify as yellow metal?

Re: BL5 vs BL4

Mon Feb 18, 2013 8:09 am

Scrivet wrote:
bob in CT wrote:I can't think of a single brass part in a Cub transmission.
PTO pilot bushing is "brass". Does that qualify as yellow metal?

Yes, the PTO shaft pilot bushing falls in the "yellow-metal" class.

Re: BL5 vs BL4

Mon Feb 18, 2013 9:27 am

That may explain why the reverse idler bushing is almost always worn in the old cubs that did not use Hy Tran.
And why they are so noisy. Another good reason to use Hy Tran :D. And the Idea of using thicker oil in the trany to keep noise down, well you may as well put saw dust in it too . Thats what the car dealers use to do :D
Boss

Re: BL5 vs BL4

Mon Feb 18, 2013 11:05 am

Thanks guys, will use the hytran. Name's Bill, by the way.

Re: BL5 vs BL4

Mon Feb 18, 2013 5:53 pm

Thanks. That clears a lot up for me. Never had a Cub tranny apart, so was nt aware of the idler bushing. Like someone said, probably the reason for a lot of the noise,

Re: BL5 vs BL4

Wed Feb 20, 2013 9:58 pm

FYI TSC has SAE90 mineral oil API-GL1 :{_}:
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