CAT 3126 engines flushing raw water side

The transmission oil cooler has 2 hydraulic lines that will leak oil when disconnected, so be prepared to tie them in an elevated position when you break them loose. You will also need rags to place under the oil cooler since it is full of transmission oil.

The inlet and outlet hoses need to come off, and last, there are 2 bolts holding the oil cooler to then bell housing that must be removed. Take the zincs out while the oil cooler is still attached to the engine....its much easier.

Do these hydraulic connections have o-rings? My brother-in-law would not remove a line with an o-ring this weekend without a replacement o-ring to go back on. He said you don't know how old they are and once they are flat they are flat.
 
I believe these are JIC flare fitting with a 37* cone and ado not have an o-ring. this is an example. I was able to find the correct fitting at a local Parker Hydraulic store.

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