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Garden Tractors Discussion Forum

Re: John Deere STX38 Drive Problem

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07-30-2013 14:57:29

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what fluid does JD say should go in the transmission? I have "Traveller® All Season Hydraulic Oil ISO 46" or I have "Traveller® RENEW Tractor Fluid" that i keep on hand.

i did see a tube under the seat near the battery that goes nowhere, maybe that was supposed to be the transmission filler and possibly some fluid even leaked out if the tube is not connected and i have been on some slopes. i will check for belt tension too and i know the relief lever location so will check that too.

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07-30-2013 22:55:18

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 Re: John Deere STX38 Drive Problem in reply to JeffL, 07-30-2013 14:57:29  

I would ask a JD dealer what fluid. I know it will probably be $10 a quart. Use a turkey baster to fill fluid. I would not risk using just any fluid in it yet.

The hose by the battery? If it is clear and 1/4" hose, it is probably the battery vent hose. The hydro vent hose will be a black 3/8" hose. Yours might have the vent directly on trans under fan covered in dry grass.

If they stop working when warm, it usually means the hydro seals/pistons are worn. You might get lucky and be low on fluid. I just checked a diagram of the stx38 black deck hydro. It does have pistons but is not the same as the link above. There is a filler plug(#2) right rear of transaxle body on top.

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07-31-2013 04:31:05

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 Re: John Deere STX38 Drive Problem in reply to rrobert, 07-30-2013 22:55:18  
Correction. I think the pic above is your transmission. The main JD link I posted is hard to find what you are looking for but has great info once you figure out how to use it.

The vent appears to be assembly 9 in the diagram.

The link for DIY rebuilding the hydro does not look like your transmission.

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07-31-2013 04:32:55

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 Re: John Deere STX38 Drive Problem in reply to rrobert, 07-31-2013 04:31:05  
Also, make sure the fan blades are not broken. Important to keep hydro pumps cool.

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