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JD 400

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Steve Simms

07-01-2001 10:22:46

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I have a JD 400 that lost forward and reverse. hydraulic fluid was half water. I'm guessing my hydraulic pump in the transmision is shot. Can anyone give me a pointer on how to check this without a full tear down.

thanks Steve

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fraser

02-04-2005 09:26:54

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Re: JD 400 in reply to Steve Simms, 07-01-2001 10:22:46

I have just restored one of these and it is not a pump fault that you have.

You will have to remove the propshaft, and pump housing (10 minuite job). Behind the pump housing is the hydraulic clutch witch actually looks like a round of bullets! this is where your problem will be.
check that the rocker (the bit in the pump housing that swings up/down)is intact. if so, then check the 'bullets' if they are okay then behind the next part (thick metal plate) there is another set of 'bullets' so give them the once over aswel. this is where the problem will be but it will cost a small fortune to fix.

Just make note of the direction of the clutch parts as they are all slightly different and have a direction to go.

Hope this is helpful.

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Tingoora

06-20-2005 00:46:28

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Re: JD 400 in reply to fraser, 02-04-2005 09:26:54

Reading toic with interest, I have a JD 400 (loader no B Hoe) sitting at home that I have changedsome very filthy hyd oil and filters in as all hydraulics stopped working. Worked okay for about 10 mins then no hydraulics, if I fill the small head tank wth oil everything works okay till tank mt's. Brakes okay, forward and reverse okay, has a fairly new recon power steering and and a new rubber coupling between motor and shaft, any help for an Aussie farmer would be appreciated.

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jonathan

07-02-2001 14:14:48

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Re: JD 400 in reply to Steve Simms, 07-01-2001 10:22:46

If reverse works, and doesnt slip, then I would lean towards the sealing rings being worn for the clutch pack for forward. The bad news is to get at them you have to split the machine. Reverse is configured differently in the reverser , so there are no sealing rings like forward. They are steel rings that ride in a collar and supply oil to the forward clutch pack. with age they wear and you lose engagement pressure

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cannonball

07-02-2001 05:18:03

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Re: JD 400 in reply to Steve Simms, 07-01-2001 10:22:46

if hyd fluid was half full of water then u probably will have the clutch pack come unglued and brakes also...water ruins the brakes and wet clutches ...hope u are lucky later

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Jim N.

07-01-2001 19:51:05

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Re: JD 400 in reply to Steve Simms, 07-01-2001 10:22:46

Roll pin in the clutch shaft where it crosses under the trans and I believe fits over the shaft coming out of the reverser.

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Steve Simms

07-01-2001 22:17:43

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Re: Re: JD 400 in reply to Jim N., 07-01-2001 19:51:05

If your right about the roll pin I would like to thank the heck out of your expertise. I am going to try to find the clutch shaft as you described. I'll keep my fingers crossed. I really wasnt looking forward to cutting my rig in two.

thanks Steve

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jonathan

07-01-2001 14:32:03

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Re: JD 400 in reply to Steve Simms, 07-01-2001 10:22:46

..do your hydraulics still work ??? does it have a loader and backhoe?

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steve

07-01-2001 18:48:28

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Re: Re: JD 400 in reply to jonathan, 07-01-2001 14:32:03

yes all the other hydraulics work. Yes it has a loader and backhoe.

Thanks Steve

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jonathan

07-01-2001 14:46:18

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Re: Re: JD 400 in reply to jonathan, 07-01-2001 14:32:03

also does it have a reverser ?? Don't rush into replacing the transmission pump...I have seen numerous people tear thier machines apart to get to that transmission pump when there is nothing wrong with it...they end up repairing the problem unknowingly during reassembly when it was a blown gasket in the clutch control valve or a broken roll pin in the clutch linkage...those pumps can have severe scoring and still put out enough to run the tractor...rule #1 in diagnosing is always eliminate the easy and CHEAP items first !!! in many cases its just that...easy and cheap

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chucklove for steve simms

07-02-2001 09:32:01

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Re: Re: Re: JD 400 in reply to jonathan, 07-01-2001 14:46:18

the backhoe has full hydrolic function on the bucket and the loader. the right footbrake works but the left does not. the transmision seems to funtion in reverse#1 #1. it does shift to forward
#1 #1 & #1 #2 but has no power. it seems to want to slowly surge forward but only on the flat. any uphill pull and it just stalls. there is no movement f/r in #2 high gears.

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Steve Simms

07-01-2001 18:52:57

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Re: Re: Re: JD 400 in reply to jonathan, 07-01-2001 14:46:18

If a reverser is the foward and reverse lever on the dash yes.

Again thanks for your opinion
Steve

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