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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 750 leaking Servo Housing

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D6btex

05-05-2008 06:54:11




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I have a JD 750 that the lower servo housing on the left transmission drips. It drips about a gallon a week, but at $10 a gallon, that adds up. Can I pull the servo from the bottom through the access plates and put new orings on or do you have to pull the whole transmission and pump out the top. Can I pull the servo housing without draining the oil reservoir? Not sure why it would siphon the oil through the pump but it seems to.
Thanks for any help.

Scott

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Jonathan in mA

05-07-2008 08:10:13




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 Re: JD 750 leaking Servo Housing in reply to D6btex, 05-05-2008 06:54:11  
You can remove the servo can with the transmission in the machine. You'll have to drain the reservoir first too. As Roy stated, there should be a lock plate at the base and you can also put a punch mark at the base of the can and one right next to it on the housing. Then you are guaranteed not to be off by a turn in or out. Just line up the two punch marks. After its reassembled, crank it over a few turns with the injection pump disconnected (electrically) to fill that transmission. Theres also a bleed screw on the "motor displacement control valve" Its the rectangular valve bolted to the transmission motor-- has some steel tubing running into it. Should have a series of 7/16" head bolts retaining the valve.. The bleed screw has a 3/8" head on it and is in the center of the valve cover--- Loosen that bleed screw a few turns and operate for/rev/counter-rotate etc.. nothing will leak out...it just bleeds the air internally from the control circuit..There is one on each transmission motor. It will be real doggy with the bleed screw(s) open..

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Roy Suomi

05-05-2008 13:41:47




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 Re: JD 750 leaking Servo Housing in reply to D6btex, 05-05-2008 06:54:11  
Man...It"s been years since I"ve worked on them..Like about 16 or so..I don"t remember for sure if that servo can be removed while in the chassis..Have you tried relieving the reservoir pressure at the fill plug ?? This might save some on oil if you loosen the plug after using the machine..If I"m not mistaken , I think the reservoir has to be drained to open up the transmission..If you do remove the servo can , It must be put back in exactly as you took it out, otherwise it will act up , mistracking, etc...There is a metal lock ring with a couple of screws that locks the servo in place..It then unscrews from the case..Maybe Jonathan can elaborate a little more on this subject...I don"t even have a Tech Manual for these machines..After years of trying to make them track correctly , I chose to stay away from them as much as possible..

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D6btex

05-06-2008 04:17:01




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 Re: JD 750 leaking Servo Housing in reply to Roy Suomi, 05-05-2008 13:41:47  
Thats a good idea about relieving the pressure from the tank. Thanks! Hopefully Jonathan will chime in with his suggestions.
Scott



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