Left track huh? Fuel pickup line is on the right, so, it may have not been able to pick up fuel and just ran out of fuel.

Why it won't turn now, could be oil got on top of a piston while sitting there. As someone already mentioned, get to the flywheel and try barring it over in "both" directions.

If it is a dry clutch D-7, some old broken link trash may have fallen into the flywheel or starter pinion and jammed things so it won't turn.

"janmeermans" wrote:

"Dude, You're Screwed".
Jan

I concur with that assessment...

Unfortunately, I too would expect the worst. I had a very simular experience with a smaller dozer. Upon tear down I found one spun bearing and others that were scared, apparently due to low or no oil pressure. Tuff deal, sorry.

If the motor was idling might not spin the bearings,just locked up crank.Cranks are a easy repair ,blocks are not.
Good luck
Bob

Just an FYI for anyone else in that predicament, I lost the top track on my D-7 3T by hooking a ground level stump on a really steep hillside. I shut the engine off with serious concern of getting it restarted. It was the left track on the uphill side. The pony needle valve and float wouldn't work upon starting the pony engine so I used the gas tank shut off valve as a meter by just cracking it and I was able to get the pony running and the diesel too. It was my lucky day...

To statements and questions from above:

"Deas wrote:

Hi, Dcrobira.
Funny thing about these old jiggers - there is a li'l gadget called a decompressor on 'em

I realized this point shortly after I posted the question.

"Old wrote:

How full was/is the fuel tank?

Around 1/2 full.

"mrsmackpaul" wrote:

Im trying to work out why your son left it running was there some reason in his thinking perhaps the pilot motor dosnt start any good dunno just thinking out aloud

We did not think it would be more than 10 minutes before we returned with the backhoe to support the dozer. I made a judgment call because of the angle of the dozer. It would be waaaay to dangerous to try to start if I could not get it upright or well supported (More details below). Also, I did not think it would start at that angle. I shudda had him check the oil pressure gauge before leaving it.

Non-existant user wrote:

If it is a dry clutch D-7, some old broken link trash may have fallen into the flywheel or starter pinion and jammed things so it won't turn.

It is a wet clutch.

"janmeermans" wrote:

In addition to the bottle top, there could also be on the seat a sticky, stinky mess transmitted from a pant leg over a very short period of time!

I'm with you on backing off and turning as you do so, however, if he was high-centered, the winch line would have helped that situation.

This was definitely a 9.5 out of 10 on the butt-pucker scale. The angle of the dozer was such that it was not possible to sit in the cab. We could stand on the side of the armrest. I believe the blade hitting the ground was only thing that prevented tipping onto its side. It was not clear if driving out would shift the dozer to its tipping point. Also, we could not get the winch to unspool.

This occurred on a hillside that slopes downhill to the left. I have a video of the incident. The D7 actually falls from about level to the 45 degree angle tilt. The left edge of the blade buried about 2 feet into the ground. There are felled trees in front, under, and behind the dozer. The D7 was essentially high centered on a large root ball and a different stump. The right track only contacted the ground with the front 2 - 3 feet of the track. Also, about 15 minutes before this occurred, the left brake went soft and was hardly working. So, like most accidents, it was a series of mistakes that lead to my broken D7.

To upright the dozer, we supported the D7 with cables then cut and removed trees behind and under the D7. I pulled the stump from under the dozer with a chain. We dug a large hole around the root ball. Then, we pulled the D7 with the backhoe and a D4 to shift the weight and force the root ball into the hole we dug.

An experienced operator might have been able to drive out of the situation, but I was not comfortable trying without some backup support. I have less than a decade of seat-time in my D4 2t. I love the D7, but $7,000 is not worth risking major injuries. In my younger days when I was indestructible, I probably wudda hung off the side while engaging the clutch.

And for those wondering, the backhoe was first choice as a backup because the D4 was in temporary "dry-dock" and not ready for duty.


Thanks for all the input,
Bob


Standing on the side of the armrest in the cab:




High centered:




Removing stump:

I tried to turn the main flywheel with a 3 1/2 foot pry bar, and it was stuck. After a few minutes of pushing in both directions, the motor broke loose and turned with considerable effort. I turned it with decompression open, levers in neutral, fuel off. I manually turned the flywheel a couple revolutions then tried to turn it with the pony. At first there was no movement in the main when the clutch engaged, and the pony did not die. After 5 or 6 tries, the pony moved the main about 1/8 of a revolution when the clutch engaged. I tried a few more times with the pony moving the main a fraction of a revolution. The pony did not bog-out, so I cut the fuel to kill it and let it rest.

So, the main is not totally seized. I do not know how difficult it should be to bar-over. I thought of trying to pull the D7 to turn the motor, but it is still stuck, and I don't think my D4 2T is up to the task.

Suggestions for next step?


Thanks,
Bob

Are you sure the hydrolic lever is't angaged