This one might be cheap enough to buy = your choice.

http://www.apexinds.com/tools/M10070.html

Now, I don't know why CAT when to such an "indepth" tool (new style), when the old style WITH correct bolt lengths and Grade 8 bolts were used, worked perfectly fine for many years.

I don't have a good picture, of the old style, but is was basically just a "two-step" round chuck of metal, with two outer horseshoe shaped grooves, cut out for the small grade 8 bolts to fit into = you just removed original tach drive bolt, installed this "two-step" spacer, then finger tighten the 2 - "correct length" grade 8 bolts, then slowly snugged them up evenly until gear popped loose. As said earlier, You must use good bolts AND have good thread engagement BEFORE you start to tighten, BUT bolts can't be too long or will bottom out.

(newer style 3208 gear puller tool.jpg)

(old style 3208 pump gear puller with grade 8 bolts.jpg)

(Picture of old style 3208 injectio npump gear puller.jpg)

newer style 3208 gear puller tool.jpg (4KB - 1599 downloads)

old style 3208 pump gear puller with grade 8 bolts.jpg (18KB - 1776 downloads)

Picture of old style 3208 injectio npump gear puller.jpg (32KB - 1878 downloads)