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Author Topic: Spot turn? Can it not work  (Read 5401 times)
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gmcjunky
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« on: July 10, 2013, 06:42:43 AM »

According to the tag on the dozer and some internet research. This dozer should have it,but when turning just feels like steering brakes. Can the spot turn not work? And how does it work?
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Blake Malkamaki
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« Reply #1 on: July 10, 2013, 09:16:44 PM »

The Spot Turn unit has brake bands that go around a clutch pack on each side. When the brake is applied, the drum stops and the inside continues to turn until a roller rides up on a ramp disengaging the clutch packs, stopping that side.

Does your tractor turn after pulling the levers? The wrong oil can make turning a real bear!

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My gramps Howard van Driest was Experimental Engineer at Cletrac and Oliver Corporation. After the plant closed, he and my uncle started an excavating business, initially using Cletrac and Oliver Crawler tractors. Please help Support This Site and give your business exposure by buying a business card sized ad.
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« Reply #2 on: July 14, 2013, 06:56:37 PM »

Sometimes when pulling on the levers the dozer will turn on a done and other times it will just drag on the motor some and not hardly turn at all. Both tracks have power all the time so I am thinking the clutches are good. What kind of oil goes in the rear end?
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Blake Malkamaki
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« Reply #3 on: July 14, 2013, 11:28:41 PM »

Supposed to have 50 wt non-detergent motor oil. My OC-12 with Spot Turn behaves similarly to yours. The oil in it smells like hypoid rear end oil for a truck. That oil has extreme pressure lubricants and, my theory at least, is that it makes the brake bands way too slippery to stop the drums, therefore making the tractor very difficult to steer. The last time I ran mine, one of the brake bands broke an end off from pulling so hard. It is on my list of things to repair.

If the Spot Turn is working as it should, the tractor should steer quite easily without a huge effort on the levers.
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My gramps Howard van Driest was Experimental Engineer at Cletrac and Oliver Corporation. After the plant closed, he and my uncle started an excavating business, initially using Cletrac and Oliver Crawler tractors. Please help Support This Site and give your business exposure by buying a business card sized ad.
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« Reply #4 on: July 15, 2013, 04:58:17 PM »


thanks for the info I'll look into that
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oliverchris
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« Reply #5 on: July 16, 2013, 08:55:35 AM »

Like Blake says. Very little effort should be required. On my OC46, a very light pull will allow the tractor to act as if it has planetary steering ? it will turn while both tracks are still turrning ? but pull a little bit harder and the one track will stop allowing the "spot-turn". Either way, its something you could just about do with your little finger  Smiley
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Specialising in Oliver & Cletrac Crawlers & Parts for HG's, OC-3's & OC-4's from the 30's to the 60's. OC-6 and others from time
1945 Cletrac HG42 + electric snowblade
1952 OC-3-31 sidewalk plow, OC-3-42 + Ware 3-WI (several)
OC-3-42 Heller Universal Trencher
1957 Oliver Super 55, 1958 Oliver 550's Gas/Diesel, 1970's Oliver 1255 FWA
1969 White 2-44 13LL (loader/backhoe)
OC-4 4 cyl. Anderson Dozer, OC-4 Series B 6-way Dozer, OC-46 Series B Loaders
OC-46-A Experimental Crawler Loader
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