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318 hydrostatic trans,control valve,power steering valve


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#1 bills318 OFFLINE  

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Posted February 12, 2017 - 01:27 AM

I have a John Deere 318. I am losing powers steering and forward and reverse and well as rear lift is weak. I have leaks from the control valve and the power steering valve. can not see leaks from the transmission pump. Seems to me the steering and the control valves get their fluid from the transmission pump. If this is so can problems with the steering and control valves effect how the transmission works


#2 Eric OFFLINE  

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Posted February 12, 2017 - 04:01 AM

Yes, I don't know JD tractors but most run on a single hydraulic system and if you loose pressure anywhere or get air in the system you will have loss of power and spongy control.

#3 Alc ONLINE  



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Posted February 12, 2017 - 05:50 AM

Welcome to GTTalk . I've never had to work on the hydro on my 318 but sure there are members that will be able to help you

#4 BigFlash OFFLINE  


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Posted February 12, 2017 - 10:24 AM

First check would be fluid level.

#5 chieffan ONLINE  

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Posted February 12, 2017 - 12:54 PM

The leaks are more than likely around thew "O" rings.  Put about 1/4 cup of brake fluid in the oil.  The brake fluid will swell the rubber "O" rings and could get you by till rebuild time.  Yea, I know.  Will catch a lot of flack over this from the pros but it works and don't hurt a thing.  Don't knock it till you tried it.

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