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1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 2:48 pm
by Mover
Finally got the 1394 to the point it’s ready for work and now found another fault.

I have hitched the post knocked up and I don’t have any control over the height of the linkage, if I move the control lever to the select position the linkage will lift to the highest position. Then if I move the control lever forward against the transport position latch the linkage will slowly drop, meaning as your driveing along the implement ends up on the floor.

Also when you move the control lever forward until the implement starts to lower it will continue to lower until the implement is on the floor. The hitch doesn’t try to self correct it’s height at any time.

Any idea ware I should start looking? Or what the probloem could be?

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 3:15 pm
by ollek
I do not think there is any problem other than a operating fault. I think that the selector switch is in TCU/External position. You need to select Height position for position control and getting the lower links to move up and down as you move the main control lever. Selector switch to the right is TCU, in the middle is Height control and to the left is Depth control (used for ploughing). There is no transport lock in a 94-series tractor. You will need to get yourself the correct Operators Manual in order to operate the 3-point hitch correctly.

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 3:26 pm
by Mover
When I turn the selector switch it doesn’t seem to do anything, as if it isn’t attached to anything inside the gearbox.

Looks like i will have to go in for a look, is it possible to access this if I remove the cover with the oil filler in it?

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 3:32 pm
by ollek
It is possible tat someone has broken the roll pin (ref 33 ) that holds the selector switch to the shaft or the R-clip (ref 34) is broken or removed. It can also be that the selector fork (ref 8 ) is broken. Broken pins or fork is a result of abuse and wrong use. Please see the following link https://partstore.caseih.com/us/parts-s ... 0ar1105539 Remove the rear cover (ref 6) in the following link https://partstore.caseih.com/us/parts-s ... 0ar1106125

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 3:37 pm
by Mover
The r clip is in place so I will have to look inside, is the cover with the oil filler on the best access?

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 3:38 pm
by Mover
Oops didn’t see the second link, I know what I’m doing now. Thanks, ile keep you posted on how I get on.

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 6:05 pm
by Mover
Ok I have removed the cover and just wanting to make sure how to proceed before I end up loosing bit down into the gear oil.
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5BC6472B-62FC-4E38-BB3E-9F0F960EF22C.jpeg (108.54 KiB) Viewed 1641 times
Am I correct in thinking, if I remove the 2 bolts and the extension spring on the right the assembley will lift out giving access to the selection control mechanism?

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 09, 2018 7:16 pm
by ollek
Before you do anything else, check that the rocker lever is moving sideways when you turn the selector switch. You should feel 3 distinctive positions for the switch. The rear end of the rocker lever is the black part between the two white legs of the selector fork. Be sure to keep the main control lever as far back as possible (against the force from the return spring) when you turn the selector switch. Forcing the selector switch to move will brake internal parts. It is not possible to do anything to the internal selector mechanism with the valve chest and the cross shaft bracket in place. It there is a problem with the rod that is in contact with the rocker lever, then the complete unite have to come out. Please make sure that the roll pin I mentioned earlier is OK. All parts mentioned are pictured in the parts catalogue pages I have provided earlier.

Re: 1394 3 point hitch, no height control

Posted: Mon Dec 10, 2018 9:56 am
by Mover
As far as I can see, the only thing that moves is the rod comeing down from the selector switch, the selector switch has about 1/3 of a turn of free movement before it hits a hard stop each way.

I’m going to have a better look tonight, if something is broken inside, is it possible that I could manually select position control, until I have more time to strip it out.

Re: 1394 3 point hitch, no height control

Posted: Mon Dec 10, 2018 10:21 am
by ollek
The ball (ref 6 in my first link) and the spring locks the selector fork and the rocker lever in the 3 positions. The ball also keeps the selector fork in the position selected. All this is made mechanically and there is no way you can keep the rocker lever in its central position for height control if the ball and spring system does not lock the position selected. If the selector fork does not move sideways, then I have a feeling that the top part of the selector fork or the rod itself is broken.

Re: 1394 3 point hitch, no height control

Posted: Mon Dec 10, 2018 7:59 pm
by Mover
Ok just been out having a play in the dark, I removed the ram shaft cam follower and bracket. This gave just enough access to get my fingers round to the top of the selector fork and as you suggested the top of the for is broken.

While in there I can move the selector fork easily and can feel the 3 distinct indent positions, I set it to the central position and now the hitch is working as it should. Do you know if the selector forks are still avalable?

Now next question, the linkage drops under load and although it will now auto corrects I would still like to rectify this and might as well be done while I’m in there changing the selector fork. Is there any way to diagnose whether the fault is with the lift cylinder seals or the valve?

Thanks again Ollek you have been a massive help.

Re: 1394 3 point hitch, no height control

Posted: Tue Dec 11, 2018 5:48 am
by ollek
If your tractor has a 3-way valve, lift the hitch with a load attached and shut off the engine. Then move the 3-way valve operating lever to position 1 or 2. The lift will drop if the lift cylinder is leaking. If the lift stays up, then the leakage can be in a leaking dump valve or in the hold valve in the valve chest. Clean the hold valve and change the seals in the dump valve before you start to do any major strip down.

Re: 1394 3 point hitch, no height control

Posted: Sun Dec 16, 2018 3:52 am
by gwatts
In several places I've seen the same technic for diagnosing a leaking hydraulic system.
If your tractor has a 3-way valve, lift the hitch with a load attached and shut off the engine. Then move the 3-way valve operating lever to position 1 or 2. The lift will drop if the lift cylinder is leaking.
How do we diagnose the same leak down issue if our tractors have no 3 way valve?