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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: JD 350 Loader

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Author  [Modern View]

04-14-2014 17:53:16

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You can use combo trans/hydraulic oil in the trans and reverser as long at it meets Deere HyGuard specs. I would NOT use 303 oil in the reverser. 303 is an old standard and Hyguard specs call for more and different additives. That reverser needs all the help it can get. VERY expensive to fix. The hydraulic tank can use "hydraulic oil" or "hydraulic/trans combo oil." Note that the hydraulic system has two filters, not just one. The filter that comes off with the top cover of the tank is the hydraulic return filter (if it's even still there). Often they are put back on wrong, fall off and land in the bottom of the tank. The reason why they fall of is . . there is supposed to be a long steel dowel inside the filter that allows you to install the long 3/8" bolt good and tight without crushing the filter. That dowel often gets lost. Then the bolt cannot be tightened very much before the filter gets crushed. If your filter is actually still on - you'll see the restriction indicator bounce up and down every time you start the machine. It will stop when the oil gets warm. If you never see it move - there's likely no filter in there at all. Note: At the bottom of the tank, under the oil is a the steel-mesh hydraulic suction filter. It's often half-plugged because it gets missed. Many owners do not even know it's there. Has spring loaded clips to take out. It's reusable. Just clean it. Often full of old hydraulic cylinder packings. Besides the reverser oil, and trans oil, you also have to check and add oil to two separate final drive housings via pipe plugs. 90W gear oil is usually used.

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