Hello,  This post is sort of a continuation from another thread. I am currently replacing a flywheel clutch, Which is out and on order and going ok at the moment. although I am still having problems getting that 1 7/8" nut off the input shaft, however I have a socket on order as well. I recently lost all my tools and am very limited on tools and need to be strategic in what I buy. I am also forced to work on the dozer in the dirt and in the sun so it can be difficult. My current challange seems to be the start pinion. I have it out but do not know how I am going to get the shaft nut off.  I do need to replace the clutch disks and dont know where to find them. Also the bearings seem to be quite noisy if I spin it but they do spin fine. Should I replace them? As allways any input is great I just bought this D4 and have no experience with it. However I am relatively competent as a mechanic. 
Any and all input is welcome. even if it is to tell me what I should and shouldent do on this thing.  
Thanks
Rich

if the bearings are noisy and you have it apart change them. its a real pain in the arse to have to strip it down twice. if you can read the manufacture numbers on the bearings go to your local bearing supply they can match them for you. most of these machines in this era used hyatt or timken bearings where they are actual ball or roller bearings. there was a bearing cross ref table in the tech library.

i suppose you dont have a bench or a vise. a vise with a rotatable head and pipe jaws is very useful. it allows you to clamp odd size and shape objects. the pipe jaws are handy for gripping round objects not just pipe. i suggest getting a dead blow hammer allows a proper hit with out bounce and shock of a normal engineers hammer

Hi,
Just need the s/n of the tractor for the bearing numbers.

Sorry to put a dampener on this It is a big job to replace the bearings in the gearbox, I have done it 3 times on different d4's.

But first drain a bit of out of the gearbox and see if any water/metal comes out?

I can go into this further but a few checks may save you heaps.

Regards

the bearings on the pinion shaft wont be that hard to do. since you have it out its worth changing them.

Yea I dont have a vice yet but I should probably bit the bullet and get a new one. Not like I wont use it over and over.  Thanks for the advice.

My gearbox seems to be in good shape. there was a little water in the oil. But all seems ok there. I will probably replace the starter clutch pinion bearings while I have it broke down if I can ever get this darn nut off. 

Thanks Neil, Ordering it from ebay now. I did not even know there was an oring looks like mine was installed with RTV only. 

Anybody know where I might find the start pinion clutch pack. If I look up the friction disk 2A3616 the most I find is at Alibaba. :/

Did you delock the lock nut before try removing the nut from the shaft and if I can help I should have these good used parts for but no more lock nut