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Tractor Talk Discussion Board

Re: IH 686 Hydraulics


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Posted by pete 23 on January 08, 2018 at 11:23:22 from (50.33.30.223):

In Reply to: IH 686 Hydraulics posted by patrick79 on January 08, 2018 at 09:49:39:

Are you talking a diesel tractor with two batteries. One mounted on left side near rear wheel. If so, that is the transmission breather and should have a little breather cap on it. If the oil is foamy that comes out, you are sucking air in system. Most common aeration problem is iced or plugged filter causing cavitation on those models. Other one is the return tube inside the rear frame. Can be filter gasket also if you changed filter and didn't use new gasket or get all of old gasket off.

To check filter for sucking air in, smear grease around the edge cover and see if it gets sucked in. To check return line, remove third arm connection plate at rear and reach in. I believe that model will have a steel line running all the way from top under cover to where it directs oil right back into the main pump suction tube. Any thing moving on that tube means trouble. Early tractors had a hose connecting main suction tube to upper short piece of steel pi


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