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The trans/diff/hyd are filled from the filler located next to the steering gear, on top of the cover. It's a large nut, on a 2.5" filler cap. You can use any good quality tractor diff/hyd oil, about 10-20 wt. It must be qualified for diff use, or it will not protect the gears! I use Texaco TDH oil. You really need to drain both housings and start over fresh. There are two drain plugs on the bottom; one under the trans, and one on the rear. Crawling under the machine should reveal these. total capacity is about 8 gallons. You should also seriously consider checking/cleaning the filter screen. This really requires removal of the lift cover. The screen can be seen after draining, by removing the PTO lever on the left side. But, removing the filter screen can be difficult unless you are a contortionist! It is only partially accessable, and you are blocked by the tire/fender. It is common for the screen to be damaged by water in the system. Removal of the lift cover REQUIRES a service manual, or you will break things!! Email if you have more questions. Bob
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