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Gear oil in old pony

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Gear oil in old pony

Postby 38racing » Thu May 02, 2019 9:39 pm

I inherited a 1981 pony I tiller. The manual says to use either straight 90 or straight 140 gear and states that you are not to use multiviscosity. It doesn't indicate what the criteria is for choosing between the two. Any thoughts on that. I just drained it and certainly don't think it had to 52 oz in it. And when I tipped it I got a rush of water. For now I filled it with what 80w90 I had left in a jug plus a cup of 75w90 synthetic. Thought I'd run it a bit and drain that out. I'm not even sure if I can buy straight 90 or 140. Any thoughts on what would be best?
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Re: Gear oil in old pony

Postby hanz63 » Fri May 03, 2019 12:23 am

For a complete DnR you can use a multigrade like 80W140, but stay with GL4.
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Re: Gear oil in old pony

Postby 38racing » Fri May 03, 2019 2:35 pm

Doing more research I keep seeing that higher gl like 5 may have additives that eat copper bronze and brass.
I found 140w
gl 1 in Edmonton here in Canada. 26$ for 2 quarts but $31 to ship to Ontario.
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Re: Gear oil in old pony

Postby bobodu » Fri May 03, 2019 5:45 pm

Beat me to it...bronze bushings.
Ho,y crap!!! What is with you Canuuks and prices??? :?
Can't you just run over to an oil shale or tar sand field and get some free?
Honestly....from what I have been reading...the modern oils don't have the old damaging additives.
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Re: Gear oil in old pony

Postby 38racing » Fri May 03, 2019 6:22 pm

I found royal purple maxgear 85w140 which says it won't damage the yellow metals.
And on prices. Our canadian tire sells it for 23cdn. A canadian online seller shows it at msrp of 58 and sells for 49.
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Re: Gear oil in old pony

Postby 38racing » Fri May 03, 2019 9:08 pm

bobodu wrote:Beat me to it...bronze bushings.
Ho,y crap!!! What is with you Canuuks and prices??? :?
Can't you just run over to an oil shale or tar sand field and get some free?
Honestly....from what I have been reading...the modern oils don't have the old damaging additives.

This article discusses the yellow metal issue. I've found a less expensive 85w140 from our ctc that the q&a says uses buffered sulfur. Given the use the tiller will get I've made a decision.
http://www.koenigwinches.dk/gl-4-contra-gl-5.html
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Re: Gear oil in old pony

Postby KE4AVB » Sat May 04, 2019 7:02 am

I don't know about the pony tiller's transmission but the TB Horse uses a bronze worn gear that wears quite heavy in forward position. And GL5 would aggravate this more as it strips more soft metal during heavy use.

I haven't gone inside either the TB pony transmissions I have here; no need as they working fine. I just cut the wheel rims off the one I have in the shop with the cutting torch. No other way to get them off, just too much rust. Customer was just retiring the little tiller for the Horse model that he got as a replacement.
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