Hi, I’m in Australia and I have a D4 30A, No.0168. I have the transmission stripped down, and I have found the shaft that drives through to the steering clutch crown wheel(12 tooth shaft & bevel pinion) is very sad. I have a parts book for D4 serial numbers 4G1 to 4G9999, a parts book for serial numbers 7J5104to 7J9999, 2T1 to 2T9999 inclusive, and a parts book for D4 60 inch gauge serial numbers 40A1 – up.All the parts books show different part numbers for the shafts. The only one that seems to match what my shaft looks like is the 40A. By match, I mean my shaft has the double race bearing assembly and all the others have a single race ball bearing on the bevel gear end. The 40A parts book number for the shaft is 9H6980. I have attached a picture from the 40A book and a photo of the shaft from my transmission.What I would appreciate is if anyone can confirm that my 30A does have the same shaft as a 40A? I am a bit reluctant to purchase the shaft with out knowing a bit more. Tilly's in Australia are unable to confirm this for me, although they do show that part number shaft in their system as a 955.
Any help would be really appreciated.
Thanks,
John   

Yes, appears you have the upgrade pinion assembly. It is not the same as used in the 40A.
Standard pinion was used on 7J5248-up, 2T, 5T, 6u-1-10362, 7U1-29733 (pinion # 8B4394).
Your 30A is the same as the above models.
The standard 955, 12A1-8097 and 26A1-127 uses a different gear and pinion.
The 3H6261 pinion is installed on 6U10363-up and 7U29734-up and was also an upgrade to the 12A1-8097
 
 

Thanks very much for the information. It's good in that I now have a part number to search for, and bad in that they do seem to be a little hard to get hold of. I do have an older D46U that I will strip down to see if it is the same, but my gut feel is, it will not be the upgraded pinion.
I'll post what I find.
Thanks again.

Thanks Neil, I had been thinking that also. Provided the parts in the other machine are serviceable, I may be able to swap all them over and get some more life out of the 30A. It is not a machine I planning putting thousands of hours of hard work on. At 60 plus years old, both it and myself are not up to that.

Hi John,
Welcome to fourm. As for your 30A you may fin the shaft in a 7U 2750 to 7U29733 as it was a feild changeover or in a 7U27934 as is was standard install. The bigest problem will be the bearings as i had to do a set in my 7U and it cost over $700 and it is no longer available from Cat even the single bearingsare hard to get, i had Surplus Bearings get them for me at the time.
You need the parts book 7U27570 -up as it is a good reference for the 30A

Regards

I'm not sure which way you are going to go with this pinion shaft, but I do see the timkin bearings and races om. Has pictured there on eBay. They would be from tree different sellers I believe for both sets. Approximately $150

Three different sellers

Hello John
You could also try Deff Jeff's in Toowoomba. He specializes in D4's. Yes he is deaf but he is easy to communicate with. You could also try Swantrax in WA.

I was told today by a reputable source that since Tillys were bought out by another company they scrapped all second hand parts and are only selling new.