What's the diff ?

[Supermario]

I've always enjoyed the assembly of the rc axles and differentials since getting in the hobby. Brings a smile to my face working with the tiny microscopic stuff we play with. Heres why......

My next project at my real job. 4 final drives to swap out with exchange and I'm rebuilding both diffs due to no exchange available for this machine. I love this work way more than underground equipment which is all tight and awkwardly built.
Axle assembly weighs 15,000lbs . Just the diff is 2,000lbs. I'll post more pics once I get the diff out and on the stand. Oh, and these are out of a 992K loader.

[ihbuilder]

now you post a bloody pic of them

[rc_farmer]

Thats cool Mario!

[Lil Giants]

Those two axles weigh almost as much as my entire 325hp 4wd tractor... that's difficult for me to process.

[Izzy]

Hmm not exactly pot metal, abs, and 3mm screws ....

Don't drop that spider gear. You can find it in a hurry but your leg might still be under it.

[Jakyat]

Shouldnt need tweezers or a magnifying glass!!!

[TRUCKMAKER]

Don't knock that one off the jack stands!

[Radio Control Trucker]

MORE POWER...

- RCT

[Cooper]

So that's what your mug looks like. I can see how you are happy to be at home working on truck/equipment parts,, our "toys" are finger friendly, your work stuff is not body friendly!! Some big work toy parts!!!!

[Supermario]

Originally Posted by ihbuilder

now you post a bloody pic of them

Sorry Steve. I didn't know you had a 992 project cooking.

Originally Posted by Lil Giants

Those two axles weigh almost as much as my entire 325hp 4wd tractor... that's difficult for me to process.

I was 23yrs old the first time I worked on a 992C. I was in awe with a hint of fear for about a week before I got use to the size

Originally Posted by Izzy

Hmm not exactly pot metal, abs, and 3mm screws ....

Don't drop that spider gear. You can find it in a hurry but your leg might still be under it.

Absolutely! True story..... I've seen a guy spinning a planetary gear in the housing with his finger. ( goofing around of course )When he reached to keep it spinning, the gear caught his finger in the housing and sheared his index finger tip right off at the first knuckle! So much weight and inertia never even slowed the gear down.

Originally Posted by TRUCKMAKER

Don't knock that one off the jack stands!

If I do.....EVERYBODY in the building is gonna know it!
Slow and steady lifts. Using chain falls and the shop crane to roll these big chunks .

Originally Posted by Cooper

So that's what your mug looks like. I can see how you are happy to be at home working on truck/equipment parts,, our "toys" are finger friendly, your work stuff is not body friendly!! Some big work toy parts!!!!

My mug and my wife Susan's mug can be found on the mugshot thread.
Ya, it always takes extra focus when working with big components. one brain fart can cost much more than a cut or bruise.

[Trucker Al]

Very impressive !! I like it..

Alan

[Supermario]

Had a productive day. Diff is back together with new spider gears ( sorry, no pics of them. I don't want to look like a tourist in the middle of the work day! )
Once everyone was gone at the end of the day I got a few more.

The 2,000lbs diff assembly.







Torque on those bearing cap bolts is 1,400 ft lbs

Final drive and brake assembly, 4,000 lbs









And finally, the 4" diameter axle shafts.



Lots of hoisting, rigging and bolts to turn but I love it!

[RCP57]

Looks way better than trying to understand the wiring on a new engine! By the way, who cleans the parts before you get to them or do you have to do that? There's no way that diff was that clean in the machine...

[Supermario]

Originally Posted by RCP57

Looks way better than trying to understand the wiring on a new engine! By the way, who cleans the parts before you get to them or do you have to do that? There's no way that diff was that clean in the machine...

They are washed as a assembly before leaving the mine but there is always plenty more cleaning that we do. We have a huge typhoon parts washer that everything goes through. Big stuff is done with a pressure washer. And yes, after 20 yrs, I still do my fair share of getting wet n dirty with the wand!

[TRUCKMAKER]

Mario, what kind of torque tools are you using for that 1400 lbs, a torque wrench and multiplier?

[Supermario]

Originally Posted by TRUCKMAKER

Mario, what kind of torque tools are you using for that 1400 lbs, a torque wrench and multiplier?

It's actually a hydraulic wrench made by. HYTORC . Electric motor running a hydraulic pump. Using a trigger you power a small cylinder inside the wrench tool. It causes the drive to turn. End of stroke you release the switch, cylinder retracts / ratchets and start over. Turn up the pressure, the tool can torque up to 2,500 ft lbs.

[Lil Giants]

Originally Posted by TRUCKMAKER

Mario, what kind of torque tools are you using for that 1400 lbs, a torque wrench and multiplier?

Seeing Mario's update, that's the 1st question I thought of too...

1998, me & the neighbor pulled the front diff from an Eaton axle that's in my Panther Steiger 325hp 4wd. Re-assembling the pinion into its housing, the nut needed to be torqued to 925ft-lbs. We used a Snap-On 5' long torque wrench capable of 600ft-lbs with a 3:1 multiplier. We stuck the handle of the multiplier in the tractor's draw pin hole, chained down the pinion housing to the drawbar & proceeded to get the nut to the 925ft-lbs setting. I still remember to this day how much the handle of the multiplier flexed & I was more than just a little scared that our jerry-rigging could come apart to kill us both.

I bought a Landoll field disc last yr, the blades are 5/16 width & unfortunately I hooked a big enough rock below the surface that I bent a few blades. The gangs are torqued to 1150ft-lbs... now I know what to ask when I search for a fix-it shop to make the repair someday.

Thanx for the thread Mario, I wondered how such high torques were achieved. Could you take a pic of the torque wrench you used? Curious to see what it looks like.

[Supermario]

We have 2 types of hydraulic wrench at the shop. The 3/4 drive can go up to 1,500 ft lbs . The 1" drive can go up to 2,500.
And we have two pump styles. The first pic is the feild service version





This one is our shop pump. Both are capable of 10,000 psi.



This is the 3/4 drive version. The reaction arm cam be rotated to almost any position. Also comes with an extension arm when required. That's a 1" 5/16 size socket you see on it.





This is the 1" drive version. The reaction arm also can be adjusted on this one and hard to believe it can handle 2,500 ft lbs but it does






This may help to give a size perspective sitting with my 1/2" impact. Both are very light and easy to handle. It's the special hoses which connect to the wrench are a pain. They're very stiff and stubborn but I guess it makes sense when your dealing with pressures up to 10,000 psi.






They are available for rent also. The website has a list of distributors. Hytorc.com

[BRICKNICK]

Just awesome stuff Mario...I as a heavy truck/diesel mechanic really appreciate seeing this stuff since the most intricate parts of heavy equipmt repairs I get to do is put a track back on or repair a bad hydraulic line or hose . Maybe a starter or a coolant leak. But I never really get to tear into our loaders or dozers like this. Great stuff bud, thanks for sharing it with us.

[TRUCKMAKER]

Wow, ok makes sense that would be easier than a 6 foot 3/4" tongue wrench and a multiplier, makes the hard part a lot easier on the body. I always hated the end when things get torqued, we just used wrenches, no fancy stuff, never much fun.