930 Comfort King 3 point wont work/water in oil

Hi,

I had a customer bring in a 930 Case Comfort King with the complaint that the 3 point hitch won't lift with a load. It will raise when empty, but takes a long time. I popped open the cap to the resevoir and it belched out some fluid... It was creamy and milky, so I'm thinking it's full of water.

Owners claimed it was working good, then started not working. Found it was low and added an unspecified amount of fluid to it, with no improvement. That's what I know so far. LOL

I know I gotta get that fluid out of there first off. What should I do from there?

What all does this fluid do? Transmission? Rear end? I read a reference that it holds ~16 gallons. True?

I'm in the process of getting my hands on a service manual. But was looking for some general guidance.

Thanks!

Deerefanatic, Of course the first order of the day is to get the system cleaned up. The second would be to find out why so much water is getting into the system. Does it sit out uncovered? The boots on the shifter levers are the most common entry points for water if the unit sits outside all its life. If there is a lot of condensation on the inside of the castings you will have difficulty keeping the oil free of a milky color. Once the system has new oil plug a gage into the remotes and check the pressure, probably it will be near 1800-2000 if all is ok in the relief valve, that valve also controls the hitch. My experience tells me that the lift plunger in the DOM valve needs removed, disassembled and cleaned. You really should have a detailed manual as there is a setting on the internal adjustable needle in the raise plunger. Maybe you could get an obliging Case dealer to copy that part of the service manual for you as it is so much better than I&T. The DOM valve is under the seat and once the floorboard is removed, not hard to remove from the tractor although that is not necessary to remove the plungers. they are under the flat 4 bolt cap above the RH brake on top of the tranny cover. If valve removal is necessary, the spool unthreads from an internal stud on the linkage by inserting a punch in the hole in the spool and turning it in the normal "off" direction till it releases, then one 1 1/4 line nut to take off and four 5/15 capscrews and its loose. Of course clean the area well before you start as there will be forty years of accumulation on top of the tranny. A good power washing once the floorboard is off will make your job soooo much easier. Keep in touch, have been where you are headed to many time to recall since the DOMs were introduced..mEl

16 gal sounds right. If you are a JD dealer or inclined to JD products, Hy Gard will be fine as I feel it is an acceptable sub for Hytran Ultra. Just don't use a off brand oil as you are just setting yourself up for trouble down the road. mEl

I agree with mEL water is probably coming from gear shifter boot area unless the oil cap has been left off by accident.

First I would first check pressure at remotes which should be 1700-1900 for a 930. Needless to say neither of my 930’s ever seems to be above 1700 so close to that should be fine.
I would replace the oil filter when you refill with oil. The rear end should hold 16 gals as you stated.

Both of my 930’s have had this trouble before it’s normally a load check ball not seating correctly. Sometimes it’s necessary to reseat them using a soft drift/brass punch.

This sounds horrible but I’ve become so used to working on these things that I buy hard chrome balls from Enco to have around in case I need to do a hydraulic fix on a case.

Ok,

update.

The boots on the shifters were indeed bad. Got new ones put on there. Now, drained all the oil out and flushed the casing with diesel fuel and allowed to dry overnight. Wiped out as much of the rear end as I could reach. Re assembled the unit and filled with new hy/trans oil. Put on a new hydraulic filter too. As a fluke, decided to pull the hydraulic pump and check the o-ring for the pickup tube. Boy my surprise when I see the pump housing was cracked open! I'm thinking it must have got water in it and froze in this cold weather!

Luckily the owner had a spare pump from a parts tractor. Got the pump put in, and the 3 point will raise, but there is a marked delay in the raising. For instance, I went out and speared a round bale with it and put the control arm up. Tractor sat there for about 1 minute, then all of a sudden, the arms raised and picked the bale up smoothly all the way to the top. Speed was on par with every other tractor I've used. If I lower it any amount, then choose to raise again, the same delay is imposed. :?

As a side note, I tried hooking up a hydraulic cylinder to the remote ports, it will move in and out about 1 inch and that's it... Weird... The owner needs to feed animals so he's coming to get it tomorrow, but I'm going to have him bring it back so I can continue troubleshooting this.

I have an I&T manual here too.

its been 8 years,,My 1967 930 I used to have would occassionally do the same thing IN COLD WEATHER below freezing ,,, the more I used it ,The better it got, feeding round bales ,. Next day same OL ' stuff , about the time Ya' think she ain't gonna Lift this time ,UP JUMPED THE DEVIL And quickly like You say normal,,. warm weather no problem ,, I did Change filter but not fluid and it seemed to lessen Delay ...

Fanatic, That slo raise is exactly what happens when the interior of the raise plunger gets sludged up. you have to see that plunger to understand its operation but it has an orfice inside that allows oil to come to the top of the plunger where there is a domed piston. The pressure then pushes the domed piston out but it cant move as it is against the cover so it pushes the raise plunger down into the raise position which allows the oil to go by the check ball and on to the large DOM piston. by removing the domed piston you gain access to a threaded standard screwdriver type plug which simply locks a adjustable needle in place. there is where the sludging occours which causes the delay as the oil cannot get to the domed piston to shove the raise plunger into position until sufficient flow seeps by the sludge clog to push it down. Take that plunger out and clean the internals and you will be fine. Keep in touch. mEl