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OC12 Cooler setup

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pagosacraft

New member
Looking for ideas on how to keep the rear end cooler. Im sure people have run some sort of cooler. Any ideas or pictures of setups would be great!
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My rear axle OC12 is never hot or even warm , maybe because i never go higher then 2nd gear because of the terrain to my cabin is narrow roads and trees . Are your tracks too tight?
 
The 1200 we have is equipped with an engine driven hydraulic pump and cooler. It's plumbed into the diff as shown in the pics.
 

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The Grand Pooh-Bah said:
Does the pump circulate even if the hydraulics aren't used?
Click to expand...
The two im familiar do. The circuit is open center. The actuation of the function blocks the center. Preforms the task and then returns to an open circuit.

There are of course priority valves and things in addition. But yes it flows all the time including the cooler
 
redsqwrl said:
The two im familiar do. The circuit is open center. The actuation of the function blocks the center. Preforms the task and then returns to an open circuit.

There are of course priority valves and things in addition. But yes it flows all the time including the cooler
Click to expand...
Years ago back in the 1970s when i worked at waterville valley sky area we had three 1200 sprytes and had problems with the rear ends heating. lots of blade work and miles of ski trails to groom. I drilled the differential cases and made up hoses and a hydraulic pump and mounted a auxillary transmission cooler to the frame body where it recieved a lot of snow to help in the cooling. I made up a bracket for the pump and put a pulley on the driveshaft to run the pump so the pump ran any time the cat was in motion. Everything was in the back of the machine so no long hoses were needed. Most of the newer oc12 units came with the plugs all ready in the housing like the 2100,s. Don
 
PJL said:
Yes, as long as the engine is running it circulates.
Click to expand...
Well it works whenever the driveshaft was turning. When you backed up obviously the pump turned in the oposite direction and wasn,t pumping but the pump was lower then the oi iln in the differential and as soon as you went forward again it would self prime.
 
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