1970 Case 530 Transmission problem

Hello, This question is in regard to a 1970 Case 530 with a loader/backhoe setup. No PTO.

First of all I want to start out by saying I consider my self very mechanical on cars and trucks, but know very little about this tractor outside of the common traits.

This is my fathers tractor. It is a 1970 Case 530 "King wheel" tractor with the Shuttle transmission. I get the general idea of the shuttle transmission that is works like a torque converter in a car, but I am by no means an expert on them.

My dad was plowing snow last winter in his yard, and had just finished and was driving the tractor back to the house. He was driving along with no load on the tractor, when suddenly he heard a "snap" noise and the tractor stopped moving. The motor still runs great, but the tractor will not move. If you use the backhoe feet to pick the back wheels off the ground, they will turn at a very slow pace forward and backward when you shift gears, but it is with such little force that you can stop them by just putting your hand on it.

Any idea of what might have happened? I can understand that something major could have happened if this problem occurred while the tractor was under heavy load, but he was just idling back to the house on his flat driveway.

Anyway, he lives near Sioux falls, SD and found a guy that could work on it. The guy didn't exactly knwo what was wrong, but thought it would be very expensive.

If I could find a shop manual for this thing, and have a general understanding of how this shuttle system worked, I would feel comfortable tackling this myself and saving my old man some money.

Thanks for any help you can give!

Hello being that the wheels run both directions with no load on them i'm going to say your problem isn't in the reverser, it's most likely in the differential most likely the spider gears.

if you take the seat off and the top cover off of the diff you can see right in there to see what is going on. when the rear end is jacked up one wheel should be spinning fwd the other will spin in reverse. if the axles and spider gears are intact.

(quoted from post at 15:56:07 02/23/11) if you take the seat off and the top cover off of the diff you can see right in there to see what is going on. when the rear end is jacked up one wheel should be spinning fwd the other will spin in reverse. if the axles and spider gears are intact.

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We took that plate off last fall, and it didn't help much... It seems as though something is weak in the transmission/clutch. If you put it in gear and let out the clutch its like it tries to move the tractor, but doensn't have enough power to do so.

When the back tires are off the ground, the right wheel will spin forward and backward, but like I said, it doesn't have much force behind it as you can stop it with your hand.

It just baffles me as to why one minute it had enough power to plow snow, and the next it couldn't even move itself on level ground.

I appreciate the feed back, but i don't believe the problem is in the diff...

The way you describe the tractor, it is a Torque Converter drive. Does it show good converter pressure on the gauge. If not something could have happened to the converter pump or relief valve which is bolted to the inside of torque tube cover under the fuel tank. Hopefully mEl will chim in and can tell you what the converter pressure should be, and further guidance. If it is a dry clutch, I would say the center of the clutch disc blew out.

I think you are on the right track about the converter. The pressure guage for this has been smashed and non functional since my dad bought the tractor 7+ years ago. This tractor has been worked hard and put away wet for the whole time he has owned it. We have always been good on changing fluids regulary and other regular maint, but this tractor has earned its keep over and over again.

Maybe I don"t want to know the answer to this, but how do you access the converter pump? I would assume it is inside the transmission, and it looks like you basically have to split the tractor. Thats what I was afraid of. If it was a car or truck, I wouldn"t hesitate to tear it apart, but for some reason this tractor looks intimadating, and that shuttle transmission basically baffles me.

Is this tractor even worth fixing? Its been perfect or what my dad has needed it for, but there comes a point and time in any machine where you are better off cutting your losses.

Any insight you have would be helpful. Any idea where I can get a shop manual for this thing?

Before you start turning wrenches to split the tractor, you need to check the converter pressure. The pump can be serviced/replaced without splitting the unit. I will shoot mEl an
e-mail and perhaps he will respond. I've been away from tech. end of these for too long to remember details as to what pressure should be. I think 180# but not sure.

Clutch pressure should be 105-120 psi
Converter pressure 30-40 psi
Oil pump pressure sould be 160-235 psi (dead headed at the filter)

Did a little further research . Called a 30 yr Case wrench, he looked it up in Case service manual for B series. 275# to 325# at 600RPM. 550# at governed speed ,deadheaded at filter in front of radiator.

My info is from my 530ck service manual. Engine rpm pump check speed is 1500 rpm, transmission in neutral and engine warm. Seems you would have to have the pump pressure relief valve out of the circuit to make 550 psi. Any way those are the reading ranges for my working unit.

Thank you both for all your help on this... I see my first step will be testing pressure.

Any idea where I can get a service/shop manual for this thing so I can tackle that converter pump? (if thats what the problem is)

Thanks again!

(quoted from post at 07:12:33 02/25/11) Thank you both for all your help on this... I see my first step will be testing pressure.

Any idea where I can get a service/shop manual for this thing so I can tackle that converter pump? (if thats what the problem is)

Thanks again!

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So have you fixed your tranny? Mine has same problem. Clutch pressure is 5 psi and converter pressure 15!