Bobcat 763 engine removal

[svtmemo]

I will be removing the the engine from my bobcat 763, and would like to see if anyone has taken on this task. I looked over the workshop manual and it says that I should develop a specific tool to remove the engine. Any advice or input would be greatly appreciated. ,Thanks

 

[Bobcatdan]

Pull the engine and hydro as a unit. As for the tool, don't bother. A little thinking with chain placement and it is very easy to pull with a cherry picker. Never found the tool handy and you need an overhead hoist with at least 12' of clearance to use it.

 

[Tazza]

Pull the engine and hydro as a unit. As for the tool, don't bother. A little thinking with chain placement and it is very easy to pull with a cherry picker. Never found the tool handy and you need an overhead hoist with at least 12' of clearance to use it.

Removing the pump and engine sounds like a big task, but it really isn't. I had an issue on a 753 that meant i had to remove the pump/engine multiple times to get it fixed. I had a small covered area that i used a hoist and chains to pull the pump/engine up and swing out.

 

[svtmemo]

Pull the engine and hydro as a unit. As for the tool, don't bother. A little thinking with chain placement and it is very easy to pull with a cherry picker. Never found the tool handy and you need an overhead hoist with at least 12' of clearance to use it.

Yeah I figured I would use a cherry picker to pull the motor. I noticed in the manual it said nothing about removing the fan assembly so I'm guessing leaving it in tact would not be an issue.

 

[svtmemo]

Yeah I figured I would use a cherry picker to pull the motor. I noticed in the manual it said nothing about removing the fan assembly so I'm guessing leaving it in tact would not be an issue.

Thanks Bobcatdan for your input. And Tazza you make it sound so easy, what issue were you having with your 753?

 

[Tazza]

Thanks Bobcatdan for your input. And Tazza you make it sound so easy, what issue were you having with your 753?

Pretty sure the fan stayed in place.
The issue it had was it would make a constant hum that was coming from the cold weather by-pass valve. Much hair pulling and a new valve, the issue remained. The cold weather by-pass i think was about 400 psi.
With that in hand, and not knowing what could be causing it as i knew the basic path the oil took led me to believe the hydrostatic pump was messed with and mayby a bearing was replaced but the grease seal was left in still preventing the oil passing through it. I was told that it had an issue ever since a "hydraulic shop" worked on it and couldn't fix it, so it could have been anywhere.
Long story short, the hydraulic pump has a small hole near the input shaft that allows charge pressure to come out of the pistom pumps into the gear pump, this hole was not present in the replacement pump. I drilled a hole into the housing, put it back together and it ran perfectly ever since.
All of this took me a few months of fiddling, but eventually i got there. It was a basket case machine. The injector pump was sabotaged and one drive motor had dead Orings, it had no power on one side. $5 in Orings and it had all it's power back.

 

[svtmemo]

Pretty sure the fan stayed in place.
The issue it had was it would make a constant hum that was coming from the cold weather by-pass valve. Much hair pulling and a new valve, the issue remained. The cold weather by-pass i think was about 400 psi.
With that in hand, and not knowing what could be causing it as i knew the basic path the oil took led me to believe the hydrostatic pump was messed with and mayby a bearing was replaced but the grease seal was left in still preventing the oil passing through it. I was told that it had an issue ever since a "hydraulic shop" worked on it and couldn't fix it, so it could have been anywhere.
Long story short, the hydraulic pump has a small hole near the input shaft that allows charge pressure to come out of the pistom pumps into the gear pump, this hole was not present in the replacement pump. I drilled a hole into the housing, put it back together and it ran perfectly ever since.
All of this took me a few months of fiddling, but eventually i got there. It was a basket case machine. The injector pump was sabotaged and one drive motor had dead Orings, it had no power on one side. $5 in Orings and it had all it's power back.

So I took the engine out together as an assembly, ended up being a fried piston and broken rings. Luckily the cylinder was fine. I went ahead and ordered the piston and rings for that cylinder, and replaced the other piston rings while I was a it. I sent the head to the machine shop and had the seals replaced while it was there. I also had the injectors re-calibrated at a diesel lab. I put the tractor back together and its running very well, no more blow by and its really smooth. Now I have other problems with the lift, but I started a new thread for that. Thanks for your help! Oh yeah, and yes the removal was pretty straight forward, I had not trouble at all using a good ole cherry picker.