We've just rebuilt the right-hand final drive on a 963 (pre-B) Cat track loader. Have it all assembled and took it to the machine, got it lined up on dowels, pretty square to the frame and within about 1-1/8" of faces being together, and can't get it to go any further. The way we measure it, we think it may be getting the splines against each other on the input shaft and the hydro motor. Our understanding is that the track brake is spring applied, hydraulically released, so we can't turn the input shaft on the brake by turning the sprocket. The service manual basically just says to get it lined up on dowels and stick it together. Is there some way to turn the hydro motor shaft without taking it loose from the frame? Is there enough slop in the bolt holes on the motor to just loosen them and twist it to align? I'm assuming that if we refill the transmission and start it, it will immediately start pumping oil out the (not yet connected) brake lines when I try to use the transmission to roll the hydro motor. What are we missing? Anyone else had this problem? Thanks.
The brake is on the motor side so final is not locked by the brake gear the brakes usually have body ground bolts holding them in place (very little wiggle room) might help you to remove axle then wiggle final
Another thought if it’s a a model some of them had a brake release pump look under cab on the cab if it has one it will have a u tube and a couple knobs
On this one, the brake is mounted to the inside (tractor side) of the final drive, and the shaft that couples with the brake discs is the one we're trying to get to start in the (internally splined) motor shaft. The brake hydraulic lines couple to the tractor with two flat-face o-rings, so there's no way to put pressure to the brake until you've already got the final drive installed. The book does mention a hand pump or other means of releasing the brakes to tow the machine, but I don't see how it's possible without the final drive bolted on. We did some more measuring, and we're pretty certain that we had the final drive input shaft started into the first part of the motor shaft (where there are no splines--the round part where the o-ring seals the two shafts to each other). We also found that we can turn the motor shaft by sticking a tool into it. So maybe you just have to turn it a little and hope to get lucky?
Do you have guide bolts in final case if you do try taking them out get shaft started and rock the final it should pop in
Yes, we had guide bolts in. We were considering that idea... might try it when we go back to that project. Thanks for the pointers.
Got it together yesterday. We finally did remove all the bolts and twist the drive clockwise/counterclockwise with a wrench on one of the sprocket bolts, and it jumped in.