C8A HUM s/n 3844536691 1944

[Shayne]

Originally Posted by Phil Waterman

Shayne

With a bit of luck you could always just remove both inner shafts, as was often done after the war to neuter a four wheel drive truck, this was even covered in some of the end of the war manuals (on US Trucks).

As a starting point for your parts search amount the CMP family how about posting a copy of the exploded parts view showing which bits are reusable and what have been destroyed.

Good luck.

I want to keep it 4WD so I would like an axle.
As I haven't pulled the third member yet I don't know how extensive the damage is. For now I'd be happy with a complete axle as from what I can see this is the only thing I will have difficulty with. Bearings are junk but complete so I have dimensions if the worst comes to the worst...

[Shayne]

Although I've had no luck so far here are the IBI cross reference numbers for the radial/thrust kingpin bearings:

ATB: AT13
Carman and Ford: CO1Q3123B
GMC and Massey Furgeson: 900928
Nice (pronounced Niece): 6081 or N1153
Rockwell: 1828K37
MRC: 14FAK379

[Col Tigwell]

used the IBI guide for many years, but you need to be a bit carefull, as they group all same sized bearing together.

Need to get advice from a good bearing man, as you could end up with light capacity units.

Regards

Col

[rob love]

Here are some of the cross ref numbers from the Cdn NSN microfiche.


Aetna A1570
Eaton K5756
Condec 01760-0011 , 1760-011 or 1760-0011
Rockwell 1228G267
Long-airdox, Rockwell, Condec 1828X37
Nice 6113
Chatanooga Boiler & tank co, New departure, condec 928

I posted these a while back when I sold my last set of 4 NOS bearings:
http://www.mapleleafup.org/forums/showthread.php?t=9587

The NSN 3110-00-158-6691 is for these bearings. There is actually 1 listed as part of a lot of parts being sold out of Montreal Supply Depot.

[Mike K]

Not sure what you are on about ..but a club member here, Len Schutt ... on his C8AX. He successfully modified a C15A front inner shaft > It was shortened and re-splined by a gear cutter ... to fit the C8A diff. It works great ..no problems .



Mike

[Bob Carriere]

First you have to relax.... take a deep breath.... a few beers might help....

First the bad news ..... the king pin bearing..originals were... New Departure 928 and has every one as already told you THEY ARE NOT MADE ANY MORE AND NO EQUIVALENT KNOWN TO EXIST.

Some NOS stock was found a few years ago in Texas and in the UK.... at $130 a pop and you need 4.......

The good news...... on your HUP only and ONLY the center of the front axle portion is different than a regular CMP..... by this I mean that on each side of your front axle you have a bolted flange that holds the egg cups..... everything front the flange outward is standard CMP.... all parts are interchangeable....... you inner axle shafts will be shorter than a regular CMP but has the Australian have found... a CMP axle can be shortened and new splines cut to match you inner gear cluster.

All the bearings and races are available.... you need to find a good clerk at a bearing service centre...... bring your old bearings and races.... they have software programs to search for bearings by size...... old part numbers are almost of no value.

As previously suggested you need to find either a HUP rolling frame for exact parts or start collecting used CMP front axle for parts...... I went through about 4 CMP axles to finally get the elusive ( to me any ways) R-Zeppa axle joints...... now I can smell them out of a junk yard at 40 paces.

Depending on the year of your HUP you may have problems finding an oil seal for the front axle.....that's the inner oil seal..... on the 1945 HUP the front axle from Rob's HUP was totally different than a CMP..... we found a source for the inner ID but could not match the outer dimensions..... solution is we had aluminium flange fabricated that held the size oil seals we could find.... cost.... about $40 each (x2)..... if you are stuck with that seal when you get there post a picture and will see what we can do to help you.

Now go out there and start scrounging CMP front axles.....and save the circular shims that sits on top and bottom of the king pin bearings.....

Bob