Hydraulic pump on D4

Could you post a picture of the pump? There were several types including the Caterpillar all in one unit and several after market add on pumps with separate tanks and valve units.
Does yours have the chain style coupling?

Matt

The HT4 uses the two valve #44 pump. You have four more 3/4 in. studs and nuts close in to the center. It's a tight fit and you have to work the unit out as you undo the nuts. It just slides off the splined drive shaft. Get some support as the thing weighs about 250 lbs.

The HT4 uses the two valve #44 pump. You have four more 3/4 in. studs and nuts close in to the center. It's a tight fit and you have to work the unit out as you undo the nuts. It just slides off the splined drive shaft. Get some support as the thing weighs about 250 lbs.

D4guy,
Here is a picture of the splined shaft comming out of the 44 hydraulic pump. Note the mounting holes. The other shows the splined shaft insert on the crank side after the radiator is removed. I think it is the same/similar as yours.
Hope this helps.....Bill

Thanks again for the info. about my pump.

As a side note, before I found ACMOC I had sent $28 to a web site called "Ask an Expert". My "expert", a heavy mechanic with 20 years experience was not familiar with my HT4 and was unable to tell be how to remove the pump. I did get a full refund so my membership in ACMOC was "prepaid".

Here is a photo what I am up against. Rusted and stuck cylinders. The tracks are nearly new but the Cat sat around for so long that several links are stuck. Another problem I will deal with some time.

I have this project on hold for a month or so while I finish the restoration on my 1940 Diamond T 201 flat bed truck. If interested check out http://www.mervbergman.net/diamondT/diamondT.html

Thanks again for the info. about my pump.

As a side note, before I found ACMOC I had sent $28 to a web site called "Ask an Expert". My "expert", a heavy mechanic with 20 years experience was not familiar with my HT4 and was unable to tell be how to remove the pump. I did get a full refund so my membership in ACMOC was "prepaid".

Here is a photo what I am up against. Rusted and stuck cylinders. The tracks are nearly new but the Cat sat around for so long that several links are stuck. Another problem I will deal with some time.

I have this project on hold for a month or so while I finish the restoration on my 1940 Diamond T 201 flat bed truck. If interested check out http://www.mervbergman.net/diamondT/diamondT.html

[quote="D4guy"]

Here is a photo what I am up against. Rusted and stuck cylinders. The tracks are nearly new but the Cat sat around for so long that several links are stuck. Another problem I will deal with some time.
[/quote]

I see you have the head off. That is a major accomplishment in itself on an HT4. Will you be able to get into the lower end through the side covers? I will need to get into mine someday.

Your tracks are probably in good shape. Worn tracks usually don't get stuck, hopefully you can get them freed up after you get it running.

Maybe this picture will help you
I think you need to open the screws around

Rusted pistons release
You will have to push them
Along with the sleeves
My previous messages have some pictures of the engine in this situation

Good luck and much patience

itzik

You definitely have the #44 pump. I have a parts book here if you need anything. Very nice web site, would like to see the gauges installed on your truck, bet it's quite a work of art.


Matt