Cat sprocket pulling cylinder

[DGH]

I have been given a puller I am told is for pulling Cat sprockets. It has twin 4" cylinders with a 2 1/2 inch hole down the centre between the cylinders. It is heavy at least 200 lbs. It came with a base that bolts to the bottom to make a two or three jaw puller. There was no pump with it. Does any one know what kind of pressure these are good for. My D 8 book says that the sprocket should to install to 60 to 65 tons. That would take over 5000 psi with this cylinder.

 

[Old Magnet]

What you are describing fits the OTC tool line twin cylinder pullers. Do a google search on them and you should be able to find the info. They use a 10,000 psi pump as I recall and at least one model (about that size) is 100 ton capacity.

 

[DGH]

Thanks Old Magnet.
You would think they would care enough about their products to put their name on it!!

 

[JimInOz]

I have an old OTC brochure here...I love looking thru it & seeing really well made gear.
OTC Bulletin ST-62 shows both 50 & 100 ton pullers for Cat,IH & Allis crawlers.
You bought the basic set,then bought the components needed for your make of crawler.
OTC Bulletin PP-66A was for master pin pushers,suited to Euclid,IH,Cat & Allis crawlers.

 

[DGH]

Does your Brochure give enought details to identify a 50 ton from 100 ton puller. Mine has a 2 1/2" hole down the center.

 

[NCWayne]

Sounds like an OTC twin ram and if so it's rated at 10,000 psi. As for using it to pull the sprockets on a CAT machine I've never seen the tooling to do that using that type ram. Looking in the CAT tool book there is only one ram listed for pulling and pushing the sprockets, although there are two of them that are designed alike. Both are single cylinders with a heavy head that has 4 ears on it that are spaced so there is a 3 leg set and a 2 leg set. Usually to pull a sprocket you put a toggle through the 3 holes in the sprocket then pin them to 3 legs that are in turn pinned to the head of the cylinder. Using that setup you push against the sprocket shaft until it breaks free. Pushing it back on there is a inner piece that threads to the sprocket shaft and an outer piece that pushes against the face of the sprocket. The rod pins to the inner piece and the outer piece rests in a flat recess on the face of the cylinder.

The one listed for pulling and pushing back on the sprockets is something like 103 tons push and something like 83 tons pull. There is also a smaller one in the 70 ton range that shows up with other tooling for compressing the big spring on track adjusters. Typically the twin rams like you've got are shown with a C clamp looking fixture designed for pushing out master pins in the non SALT style tracks. There is still tooling available to do that also. I don't know when it happened but at some point OTC sold that part of their line to an outfit called WTC Tool Co. They specialize in all types of track and cylinder repair equipment and tooling.

The reason I know all of this is Dad and I recently did the undercarriage on a D9G. We have both rams and the associated pulling legs for the sprockets but had to make the other pieces as we were told they were no longer available. As for the uses of the smaller one, we made a mount that allows us to use it on our press and it had started to leak so I was looking at the tooling book about three weeks ago so see if there was a packing kit available for it.

Next time your at a CAT dealership ask to check out a print copy of their tooling book, they have some unique contraptions to do alot of different things.

 

[DGH]

Ok if it is rated for 10,000 psi then it is the 100 ton ram. It does have the base plate with the 4 ears for a two or three jaw puller. I know how to set it up for pulling or pushing, it was just that I was not sure of it rating.

Thanks for the info.