New member..grandfather's HD5

As for the final drive seals, you need some large tools to get things apart.  Start with breaking the track (takes a very large hammer and drift punch at the master pin with backing behind the chain so it doesn't bounce when you hit it). It's better to break the chain near the drive sprocket and lay it out ahead of the machine so that you can roll the under carriage ahead on the track chain (may need to jack the frame of the crawler higher to clear some of the truck frame as you roll it ahead, be aware the truck frame alone is probably around 1500 pounds on a 5 roller long frame for a loader.  Then when you get the outboard bearing housing and seals off (recommend replacing the outboard seal when you reassemble), you'll need a very large wrench to get the sprocket nut off (I don't remember what the size is since we made our own wrench, but the torque spec is 1500 foot pounds).  You'll also need a big puller (most likely will need a port-a-power) to break the sprocket loose too since it is seated on tapered splines.  After getting the sprocket off, it's a fairly easy process to remove the final drive seal then and replace.  Make sure you get the drive sprocket properly torqued again when going together too, mine were both loose and had ruined the axles.

My main concern is to buy a bunch of things and then find when it comes right down to it doing anything serious with this machine at this point is just too much for my budget. From what my dad and grandfather said the final drives on the AC were always issues and that eventually they always leak. 

I appreciate the input and will try to find out more about the STP in the 5 gallon pails. TY!

I prefer 40w for Detroits as they get thin on lube anyway, 30w is fine for cooler weather.   Most of the engines I worked on were worn slick, the heavier oil helped keep some lubrication when the engines heated up.

I get my Baldwin filters online the Filter Associates, they have had all the oddball Allis specific filters I have needed to date.

I got the blade off today, pressure washed her up, I've never seen this machine so clean. The old yellow paint job(my dad did in 71) was flaking off and I found the HD5 AC Diesel on the back of the fuel tank. I know my grandfather would be happy. 

Now the bad, when I went to move the machine into the RV port noticed lots of oil coming out the bottom. Turns out one of the oil lines from the lubefiner oil filter canister rotted away and opened up under the floor pan. So, spent the good part of the evening removing the lines from the 90 right under the battery on the left up to the engine. All original stuff, never had a wrench on it in it's lifetime. 

Here is a question: Can I replace the metal lines with rubber tranny lines as the original lines literally came apart when I tried to work them out from under the clutch lever. 

OR, would the machine be better served if I eliminate the large lubefiner filter and mount a new oil filter head and use and updated oil filter? If so, any suggestions on filter head size and micron ratings I should look for in a filter? 

A few years back when I got the dozer I learned from a member the final drives seals won't expand with brake fluid.  I wish there was an easier fix. 

This machine really has lots of life left, not to mention it's not all beat up like many I've seen over the years. I'm just hoping I can get the tracks off and fix those seals. 

I'm also really afraid the track adjustors will take a lot without the right setup(torches esp.) I think when I start to try to turn the nuts things will begin to round off pretty quickly. 

Any advice would be appreciated fellas! 

 I'll have to look over the track removal as my dad says they always had torches and things to work on the machines. Closest thing I have is a hand held torch. 

I think the spool leakage is because the hydraulic was over filled before the machine was delivered to me. When I opened up the butterfly on the tank lots of fluid came out. It still seems to be leaking but I'm hoping it's residual from the over fill. Plus it was filled with the univeral tractor fluid, I'm not sure if that stuff is too thin for this machine.. plus it was mixed with who knows what and it's been in there for at least 50 years. One of my simple goals was to change out the hydraulic but now I have to fix my oil filter lines. 

I've got a mobile mechanic coming to take a look at it Thurs morning. Not sure if that will work out as my wife is on my case about dumping money into something that I don't and will not use.