D4 7U Questions

I am still have extra used parts for ht4 motor and you should removed the pan and check the oil pump in same time

I have the same project going on. Maybe we can share notes.

There is a good discussion of the oil pan removal on the bb. Do a forum search on:

Traxcavator 955 12A - the next phase

If your HT4 is the same as that one you are in luck.

Mine is older and has a cross member at the front of the track frame as well as the main crossmember near the rear of the engine. I was under the thing yesterday and decided the front cross member (which is part of the loader frame) can be unbolted from the track frame (5 bolts each side). I am sure that the five bolts will have to be cut off. The nuts are rusted and recessed in a cavity in the track frame making them impossible to unscrew. I think that the tractor can then be tipped back at the front high enough to clear the main cross member without having to remove it.

On the newer units there is a lubricated pivot pin attaching the x member to the engine. This of course, must be removed first. Mine has a dry pivot pin that I don't yet know how to remove. I am about to drop the rear belly pan to see what is involved in removing the pivot pin.

You can check out my project at: http://www.mervbergman.net/CaterpillarD4/catD4.html I will be posting more photos there from time-to-time.

Good luck. Merv (d4guy)

I broke my D4 Traxcavator site trying to up load more photos. My wife and webmaster will fix it when she gets home Thurs. evening.

Sorry about that.

Try http://www.mervbergman.net/CaterpillarD4/

m

Hi Merv,
Thanks for the information. I think we have about the same loaders with the 5 bolts on each side and 4 in the rear. I agree that the front bolts will have to be cut. I did try to just see if they would turn and could not budge, turn or twist them with about 4 foot of wrench and cheaterbar. I do not see the pivot so will look again. I have been able to move the three pistons and we are going to try to remove the rod nuts (through the side inspection cover) on the stuck piston and force piston sleeve and whatever else comes out the top by turning the crank on the front hub by the fan. The sleeve does move a bit when the pony clutch is engaged and you wiggle the rope pulley by hand so I think it will come out. If that does not work out we are not out anything that I know of. Then we will try to just "loosen" the loader front and back and see if we can get the clearance to get the pan off if needed and check out the oil pump as suggested by GemDozer (Thanks!). Hope you get your site back up, sometime I wonder why we buy these computers, seems like a lot to pay for frustration, but at the same time we sure learn a lot from each other!

Thanks
Gene, Old Cats

Hi Gene,

I think you don't have to loosen the loader frame at the back. As I understand it the whole thing will lift with the Cat frame and engine pivoting together around the rear axel, leaving the tracks and cross member on the ground.

If the sleeve is loose you should have no trouble pushing it out. That 4' lever I had clamped to the fan drive pulley would help in turning the crank. I had tried to turn my diesel with a lever attached to the pony flywheel but the pony clutch just slipped. After seeing what was inside it is no wonder!

merv

That make sense, I will give it a try. I would really like to look in there. Someone ran this thing with a broken lifter and bracket and not all the pieces have been located.

Thanks
Gene

Well, last night I dropped the rear belly pan and was able to see how the rear end of the lift frame is attached. So I was wrong about not having to remove the bolts at the rear! Rats! That makes removing the oil pan a much bigger job. I don't know what to do now.

How is your project coming along?

My Cat has a dry clutch and someone removed the compartment drain plug and left it out. Now I have a heavy duty mouse apartment complex.

Merv

u will have to jack up the back of the tractor because when the pan is on the floor u can't drag it out because something is hanging down (maybe oil pump). i done it 10 year ago and don't remember it all. this was a d4-u without loader. good luck.

u will have to jack up the back of the tractor because when the pan is on the floor u can't drag it out because something is hanging down (maybe oil pump). i done it 10 year ago and don't remember it all. this was a d4-u without loader. good luck.