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News: 10/5/12 - All new members are REQUIRED to fill out the signature section of your profile. Otherwise, you may be deleted from the forum. This is to help me determine if you are a member or if you are a spammer. Thank you.

9/22/12 - I ask that you please add a signature line to your profiles on the Cletrac Forum to help me to determine who is spam and who is not. You don't need to drop everything and do this immediately, but please do it when you get a minute and you are visiting the forum. Just go to and put something in the signature area. If you no longer want to be a member on the Cletrac Forum, please remove your membership.

8/10/11 - Added a new board: Trucking and Hauling

5/30/11 - Just added several new pictures to the Photo Gallery, including several Alfta Track OC-4 working in snow logging, several from the Chicago Road Show, and some from a logging show (not all Oliver/Cletrac). All these pictures are from around 1963 and were scanned from old slides given to me by my late friend John W. Davis. Go to the Photo Gallery and click on "NEW" to see these pictures. Quality is marginal, but I think you will enjoy them.

2/13/11 - Just added a new board "New members introduce yourselves here".

Folks, I just added a new photo gallery where you can upload your own pictures with descriptions, etc. Right now this is in the beta testing stage to see how it works out. Give it a try, but please keep a backup copy of your pictures just in case we decide to use something else. I would prefer you use your real name on the photo gallery, but if you really don't want to, please use the same username as on the forum. Please put your images into the proper categories and take care when your write out your descriptions and image names so people can search for them. I am learning this as we go. At least at the beginning, I have it set up where the administrator has to approve members. I am afraid we may get porn spam in here if we leave it open. To get to the photo gallery, use this link:

Folks, when you join the forum, or when you get the chance to update your Profile, please be sure to put your location and interests. Filling out your signature would help as well. I've been getting some spammers joining and posting links to sites that are completely unrelated to Cletrac or Oliver, or anything to do with tractors. It would make it easier for me, as well as all the other members, if you guys would put your location and interest in your profile. See

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1  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: Oc 4 not getting warm on: December 20, 2018, 05:53:09 PM
Could the bulb hole be filled with sediment and blocked, preventing coolant from reaching the bulb?

Ran into that recently on an inoperative pressure gauge on a water system.
2  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: Oc 4 not getting warm on: December 15, 2018, 05:53:52 PM
Hello, fellow NB'er!

Reading your post, my first reaction was that the new gauge got busted when installed. I've twisted that fine tube off on occasion.

I'd pull it and recheck.

Jack Wetmore in F'ton.
3  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: IXK3 starter parts on: December 05, 2018, 02:32:09 PM
Hello Dave -

Have you tried Zimmerman Oliver Cletrac?

They have probably the best stock on the continent. And if they don't have it they will probably help you find the parts.
4  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: HG track support bushing question on: November 08, 2018, 05:11:57 AM
Went through three tractors with the problem 30 - 40 years ago.  Built all up with brazing, Machined with fly cutters driven by electric drill for the casting (Pressed out the axle and inserted a stub armature) and drill press and jigs for the brackets. Added grease fittings to the 2 brackets with none on the the front. Not a precise job by any means (lots of holes from insufficient brazing) but hey - they hold grease and stop the flop and toe-in!

And it's likely given the ages they'll outlast the rest of the units - as well as me ! !
5  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: Having problems reassembling HG Track Rollers on: August 10, 2018, 06:35:17 AM
Hello Steve -

I've run into that too, and if I could turn the roller with ANY device (chain wrench, 4 ft pipe wrench,), I put it on one of the front positions on the track frame where I think there's the most weight (and traction to turn the roller!). Those worked free in short order.

If they wouldn't budge at all, I drove out one retainer and took a round file to the high spots that showed up (clearly!) on the bushings. I used stp when assembling - probably overkill but I had surplus.
6  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: Source for OC-3 u-joints on: April 01, 2018, 06:53:04 AM
I replaced mine with Spicer, Moog and Rockwell units over the years as I rebuilt the tractors. These had grease fittings, so would last longer . . . As if thAT'S A FACTOR, WHEN THE ORIGINALS lasted forty - fifty years!

Didn't record part numbers, unfortunately.

I've recorded the splines as 1.1" OD by 6; that might be the standard 1 1/8 PTO shaft size and I measured wrong . . .
7  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: OC-3 track roller bushing retainers on: June 20, 2017, 06:32:22 PM
After oliverchris's suggestion, to add a bit more friction to the roller, I'd try  backing it up onto a chunk of 4 x 4 laid sideways to the track, stopping as the 4 x 4 reaches the stuck roller.

Then moving back and forward a foot or so places a lot more weight - and turning friction - on that roller, and might shake it loose.
8  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: OC4-3d help. Newbe here on: June 10, 2017, 05:30:36 PM
Came through ok for me!

9  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: OC4-3d help. Newbe here on: May 22, 2017, 04:25:42 PM
On my 3's, I line up the link pin about 9 oclock on the rear sprocket. I can then drive the pin inward without interference, and the teeth on the sprocket keep the track from an uncontrolled departure forward.

I think the 4 track frame and final drive arrangement is similar.

On reassembly, the same positioning and some help from a block and tackle or come-along to pull the links into alignment simplifies the job.

And I've found a spike (4"? 6"?) about right to replace the lock.
10  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: Help Requested To Bracket My OC-3's Serial Number By Compairing With All of You on: January 26, 2017, 07:38:39 AM
My 1952 OC3 6WH994 has the same blade setup, with the tank in front of the rad.

11  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: OC-3 track roller bushing retainers on: November 21, 2016, 05:54:40 PM
Hello Will -

Haven't any measurements, but I've used them with the oil channels on the inner ends nearly worn down.

Even though they are shorter, with the snug fit, once they're driven home they're not likely to loosen in service.

If the channels are worn flat you could grind new ones - they provide oil to the axle bushings.
12  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: Newbie needs help on: October 10, 2016, 01:43:27 PM
I have a suspicion that the 008 might be valve clearance. Dunno if it was hot or cold!
13  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: HG Service Bulletin Information on: September 25, 2016, 12:30:04 PM
Hello Hoopty -

I use Irfanview to play with pix. Free, and easy to use. The "half size" option (half width, half height) cuts the file size to about 25% of the original.

Google it for a download. But check the download selections closely so you don't wind up with some fancy annoying garbage . . .!
14  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: OC 3 Starter Motor on: June 12, 2016, 10:09:49 AM
The originals on ours were Delco 1109602. Armature is Delco 1888751.

You may get some hits looking for these numbers.

There was also an Autolite starter, but I don't have the number for it. Might have been fitted to the IXK3 on earlier OC3's or Generals. Probably had a bit lower power output, for the lower HP engine.

A couple of possible alternate starters: 1109609 and 1109454. I haven't used either, but they were crossed in some literature. I was told  by an Oliver serviceman there was one with 4 field coils - more powerful - but have no numbers for that one.

I've gone to 12 v. Another knowledgeable tech said the starters lasted longer in 12 v service, because they didn't have to work so hard - as long as the engine starts reliably. Prolonged operation trying to get a balky one going can fry the 6 v units.

I've had some success with London Generator in London Ontario Canada. Got an armature from them must be 20 years ago, and it's still in service.

If worst comes to worst, I may have a core here that they could rebuild.

Good luck; keep us posted.

15  Cletrac Tractor Discussion / HG, OC-3, OC-4 & General / Re: HG -OC3 magneto choices on: April 27, 2016, 05:40:52 AM
I've used both the original XH1113 and an FM J4B off an AC B on OC 3's over the years. I had to rotate the mag drive gear a couple of teeth to line up with the FM impulse dogs.

I have a handful of Wico XH carcasses here, acquired over the past 50 years. All need coils, points, rotor, cap etc - they've been robbed to keep my remaining OC 3 running!
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