hd6 broke :(

guys i had finally got the hd6 running good and was pushing brush when i heard a pop in the rearend now the right rear when looking from front of dozer wont drive itself all i can do is a left circle. I knoticed the sprocket on that side tilts inwards when i try to go farward and tilts outwards when i try to reverse anyone got any ideas of what was the weak point or what would cause that sprocket to lean in and out and not spin with the tractor. i'm just guessing here but if i broke the axle is it a difficult change, as in do i have to drop the track and the outside rail and pull sprocket or can i just take the bolts off the outside and pull the axle? any help is appreciated cause now i'm at a loss.

sprocket is between 2 sets of bearings of the 3 used to support the rear axle and drive gear. Could be worn out splines and sprocket center or bearings or broken axle. 

k guys thanks for your help as i said before this sight is great, me and dad are going to pull it to the house this weekend with the 190 and drop the tracks off. got a question to remove the tracks should be look for a master link in them was reading the book and not for sure how they remove are they like the newer dozers where you remove a pad and the pin removes?. and where hoping its just a bearing thats what its acting like cause sometimes it grabs and wants to go. i will post pictures and we should know this weekend. again any advice helps us out thank you all.

The master pin is usually longer than the other pins. I paint the master link with fluoresent pink paint. You need to back up the master link when using the bfh. Position the link on the sprocket or front idler or have a helper hold a bucking weight on the back side of the link. If this is not done much of the force of the bfh moves the track, not the pin. Some people have been sucessful using a ball joint tool or other "C" frame presses. I have a home made portable hydraulic press that clamps on the link.

One person method I use a piece of pipe wedged against other track, then welded a guide onto track pad to hold my punch straight onto pin , then swing away . 

the last time i separated my track, i moved the master pin to the rear of the dozer about 10 o'clock if you are looking at the sprocket and cut a piece of pipe just larger than the od of the pin and long enough to wedge between the track and the rear housing so all the force from the bfh was transmitted to the pin and not bouncing the track. i also welded an old track bushing to the pad and put my punch in it as a guide and swung away. i did not have a helper so the bushing held the pin perfectly in the right place. there are pics of my track removal on an older post with all there pics but i do not remember what i called it. i had the track, truck frame, sprocket and axle out in about 3 1/2 hrs by myself. it has taken me 4 months to get it back together as i cannot seem to find 4 hrs in a row to get it back together. :) good luck.

Neighbor had HD6 and broke axle . I welded it back with 7018 rod .It lasted untill he scraped out tractor.

finally got it apart today guys bad new broke axle just like the one i seen in the restoration pictures. well question i have is does anyone have the bearing numbers and seal numbers i can get. and where would i find an axle for a hd6 dozer my sprocket is in great shape just need axle and if price is right i might buy a complete ready to bolt in unit from someone with new bearings and seals if someone might have something in that line. any help is appreciated. thanks guys.

David, whats the serial number of the tractor?. There's a serial number break that would indicate a 6 spline sprocket shaft (early style) or a 20 spline shaft (later). Or which one of those shafts you have would identify which bearings you need also.

Right on the mark there Dozer, I`ve had tractors with one of each spline. As you say, bearings are the same

I am still have a 20 spline sprocket shaft

I have one axle from a HD5 with the big splines setting on shelf - found it about a week or so back after looking for a year or so of where i put it . Moved 3 engines and somehow it was hidden behind them. 

Am pretty sure 20 spline sprocket came in the same time as the change from raybestos to sintered bronze steering clutch plates. this was around sn 14000, just after the introduction of the 6000 motor. Have a early parts book for HD6B/E 13322 up and it only shows 6 spline shaft, raybestos plates and only a dry master clutch. Any wet backend HD6 has the 20 spline sprocket shaft.

Edited by Coke-in-MN - 10 Apr 2013 at 9:48pm

Coke-in-MN wrote: What is the cheapest way to ship this axle ? Not that big but weight makes it around 60 to 70 pounds.