Hydraulics on a D2 3J

I have an early D2 3J that has a PTO Hydraulic pump that operates the blade...

Ray, Remember that a rear PTO run hydraulic pump quits running when you disengauge the clutch . A PTO pump run off the front of the engine will give you live hydraulics all of the time. I am not sure if the front mounted PTO pump will fit on the early 3J series D2's. W. SMITH

Which part of the US are you in? Hydraulic parts leak all over no matter how clean the seller thinks they are. They are heavy which adds to the cost of shipping. All the iron parts that will be needed will add to the cost of shipping and labor, plus getting a good blade to put on it. Getting a good setup that will take the abuse of a D2 can be tricky! I have a blade on mine and to look at it makes you wonder how much use and abuse its had! A 3J will be weak in the main spring, have smaller idlers and less rollers making for a little bucking bronco. At dirt moving demonstrations, I am forever bombarded by gentlemen that ask, "How do you move dirt so well?" As they have D2 and can't seem to level dirt with it. I explain about the larger idlers, heavier main spring and rollers being incorporated into the build of the machine, not to mention the different gear ratios in the transmission. CAT's setup for Ag have different gear ratios than CAT's setup for construction work. There are a couple of guys advertising parts and pieces in Nevada and California, there may have been an advert recently for a guy selling parts in Illinois but right off the top of my head I can't think of one on the East Coast. You can put the pump on the back, my Laplante-Choate is on the back. When you stop at the end of the push, pull the lever back to raise the blade, change gears, back up, the blade will rise. The only time you'll wish it was live is when you are trying to finish the grade at which point you want the blade coming up before you start moving. There are alot of threads in here on front mounted pump conversions, belt driven pumps and rear mounted pumps. Search around, you'll find lots of info. My advice is, if its a nice AG CAT, then leave it unless you can buy it really cheap to make a conversion worth while, better would be to find a better machine suited for want you want to do.
Jeff

The J series parts book lists a 5B5024 special 3rd and 4th gear group. This changes the gear ratios from 20/25 (3.0 mph) to 22/23 (3.6 mph) for 3rd and from 22/23 (3.6 mph) to 24/21 (4.2 mph) in 4th.

This resulted in 3 closely spaced higher ratio gears for higher speed work (1.7, 2.5, 3.6 4.2, 5.1)
instead of 4 closely spaced lower gears and one "transport gear"(1.7, 2.5, 3.0, 3.6 5.1).

Additionally all the tractors manufactured during WWII (no D2's made in 1943 though) were spec-ed with the "special parts" gears and labeled on the serial number tags "SP". The old joke is that it was to outrun the bullets.

My 5J ag cat makes a good enough dozer Cat. The work I do is nearly all in 1st or 2nd gear anyway. Puting the front pump on was a different story. figure on quite a bit of building. There is no satisfactory flange on the front to hold the pump. There are only two holes in the front pulley to which you can build a drive. The drive shaft clearance under the radiator is very close and there isn't room for U-joints and such, but it can be done but it will require the services of somebody's machine shop.

The J series D2 has a front pulley with a second groove to run a generator. I have an old Vickers pump off a forklift. I want to mount it more or less where the generator was. I have not gotten around to it yet. The pump originally ran with v belts on the forklift so it should take the lateral stress. With a pulley the same size on the pump and the proper belt(C?) it should transmit all the power it needs.

I sure hope I can get around to it this year, I need it to lift the knife on the JD #5 mower when cutting hay. I have decided not to try to install a tool bar dozer on the 5J, The track frame is not near as heavy as a 5U.

Looks like no photos are going to be posted...Welllllll, It will be a clear day tomorrow...and I'll just have to take some photos of the PTO pump arrangement on my D2 3J 221...It looks like it served the dozer very well...