560 won't move

I have a 560D that we tractor pull with. This tractor has been pulling the heavy classes for 13years and haven't had any trouble till last night. My son pulled the TA and heard a loud bang at which time the front slamed down and tractor not moving in any gear. Years ago we broke a bull gear axle in a 230 and the break pedal went forward like nothing holding it. The 560 brake pedals seem normal but they won't stop the tractor. Any ideas what is broken. Thanks for the help.
 

Even if you broke a pinion the brakes are separate on each side.

Are you sure both brakes are not working?

It is easy to pull the inspection plate off the TA and see what is or is not turning at that point.

It sounds like it is time to open it up and take a good look.
 
start at clutch and work you way back. I have seen the clutch rivets shear. its tear down time.
 
If both brakes would work before the noise it just about has to be from the bull pinions back to and including axles and both sides failed. Even if a bull pinion broke or stripped teeth, or the bull gear failed or a broke axle the other brake should stop the wheel on the other side unless a failure on that side also. Would have to really wreck things if the differential housing broke and wiped out the bull pinions to stop brake on both sides from working, but anything is possible. Would start by pulling the brake covers and jack up rear and turn wheels and watch.
 
Will it move with the TA forward? (just asking you probably did that) blown differential pinion, ring gear, Spider gears, Diff Housing, A differential shaft/final drive pinion, bull gear or axle. Jim
 
D Slater. I held the left brake and it didn't move. I held the right brake and tractor moves. Does this mean a broken axle or bull pinion?
 
It means that there is a break in the right final drive from the right side pinion shaft, on back to the axle.
The pinion shaft is turning on the right because the brake is splined to it and when the brake is applied, that shaft is stopped. Stopping the shaft causes the power to be transferred to the opposite side final drive components, moving the tractor. That part called -- Shaft, bull pinion and brake -- is unlikely to fail without radical nasty ratcheting noise. The pinion drives the bull gear (also quite robust) and could make problems trying to tow the tractor away from the sled. The axle is next and it could have had its splines twisted off at the bull gear. If so the gear would fall away from the pinion, and do nothing and make a bang when it broke. The remaining axle out to the wheel could also be broken. If the wheel was at an angle, it could be broken internally, between the end of the axle housing, and the inner axle bearing. The last thing is a possible failed wheel hub and splines at the wheel. They can look pretty normal but be stripped (sheared key, or broken clamps). I hope this helps. Jim
Parts Diagram
 
Thanks. I'll take the brake housing off this week and start from there. I've already checked the wheel hub. It doesn't look like it has moved. Thanks for the help...Ed
 
The brake housing will not show you anything. The brake is working, and there is no way to see anything inside from there. If the hub to axle connection is good, taking the top off may be the only way to see. A bore scope, or a good light might be able to view something through the PTO mounting hole. Jim
 
I broke a bull pinion shaft in a 1086 and it acted like yours. Drove it home dragging the brake while trying to drive straight. If it is the bull pinion replace the pinion and bull gear as a matched set. I replaced only the bull pinion in the 1086 and a year later lost a tooth in the bull gear, locking up the axle at 22 MPH on the gravel road. BANG.
 
Can check the right side more by removing the right brake and the bull pinion retainer plate, then pull the bull pinion out. Then with the right side wheel off ground turn it and check all teeth on bull gear through the bull pinion hole. If splines and teeth look good on the bull pinion and good teeth on bull gear check for a broke axle or damaged bull gear hub. If the axle broke you could get by without removing the top cover and no need to pull bull pinion out. But if the bull gear or pinion teeth are damaged you may need the bull pinion out anyway. Right side is not connected to the wheel between bull pinion and wheel. Could very well be the axle because if you had the right wheel turning some broken teeth would probably contact unbroken teeth and make noise or shutter in motion.
 

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