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1961 Case W3 (530) Differential Blues

C

Cariboo4x4

Member
My backhoe loader, I noticed today making an audible clunking noise. I diagnosed it coming from in rear differential. It would not clunk going really slow yet in 2nd it would get loud and occur once for each revolution of rear wheels. I continued for a 1/2 hour just going real slow to clear a pile of dirt and rocks off our driveway. Stupid me, I should of parked it and did a couple more pushes with loader into dirt and rocks I had piled up with hoe. The last push the bucket must hung up and I gave it some more throttle and thats when I heard a loud slipping noise like a spinning a bicycle spokes past a playing card. Yet louder and sharper. Because we live on a mountain side I had to go up our steep driveway and the clunking was louder. It has differential brakes which I used alot this past spring on ice\snow when we were doing some small scale logging. Mabe some thing came loose or a broken gear tooth? I will remove seat and top diff cover over the next few days. I will put it up on blocks so I can rotate wherls since stabilzers leak down.
 
I'd like to add is one differential tube was slightly seperating on bottom of differential case. I had tightened these 5/8" bolts and replaced them with longer bolts yet knew it would only be a matter of time before I'd have to rebuild rear differential and find or repair threads in differential case. I'm thinking when machine is dropped to ground when a person brings up stabilizers, the impact of the drop, may have cause this differential tube to start seperating from differential case. Luckily I have a great service manual and can rebuild rear differential myself yet getting new or food used parts worry me. This may be my winter 2017\18 project. This differential tube seperation issue I happened not to see when I bought machine. Gap is nearly a 1/4" so I assume axle and differential are not very happy right now.
 
I wonder if a 5/8" helicoil would be strong to rethread holes in differential case for differential tube bolts? I've done smaller helicoils in light duty applications. I have a parts book for my case tractor so maybe parts still exist?
 
I think you are talking about the bolts that hold the axle housings to the trans/rearend case? If so I have seen them broken from (and you already said the cause) from digging with the stabilizers not down enough or at all and this puts too much stress on the axle housing/and axle, most times I see the housing broken fix the stabilizer issue, you have a issue with the interlock or just need to rebuild the cylinders
cnt
 
(quoted from post at 04:42:27 06/08/17) I think you are talking about the bolts that hold the axle housings to the trans/rearend case? If so I have seen them broken from (and you already said the cause) from digging with the stabilizers not down enough or at all and this puts too much stress on the axle housing/and axle, most times I see the housing broken fix the stabilizer issue, you have a issue with the interlock or just need to rebuild the cylinders
cnt
Click to expand...

Thank you. Yes axle housing is separating from rear end case.
 

Helicoils will be strong enough IF THE HOUSING IS STRONG ENOUGH. If it's cracked even a little bit from the old bolts being pulled out it'll just crack again. It takes a VERY good welder to weld cast iron, and probably can't be done on the machine, so if it's cracked you should start looking for another housing. Or a scrapped tractor to keep around just for parts.
 
(quoted from post at 20:06:23 06/08/17)
Helicoils will be strong enough IF THE HOUSING IS STRONG ENOUGH. If it's cracked even a little bit from the old bolts being pulled out it'll just crack again. It takes a VERY good welder to weld cast iron, and probably can't be done on the machine, so if it's cracked you should start looking for another housing. Or a scrapped tractor to keep around just for parts.
Click to expand...

Thank you for the info. Luckily a neighbor has a complete rear differential however it has a couple damaged gears. I hope center differential housing is in good condition. Possibly he may different gears damaged compared to mine.
 
Update: I have a good used crown and pinion now and a bunch of other parts I needed. Off to get new pinion bearings\races tomorrow.
 
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