Opinion and ideas

3N · Mar 19, 2022

I am in the process of splitting my 640 between the engine and transmission. It is separated all around the joint except at the hydraulic pump manifold site. The manifold is part of the engine casting and is bolted to the transmission casting at that site. I have removed the bolts, but it is still stuck there. It appears that perhaps it may have leaked fluid there and someone sealed the joint with something. Any thoughts on this theory and how to break it apart would be greatly appreciated.

Sean in PA · Mar 19, 2022

The manifold is part of the engine casting and is bolted to the transmission casting at that site.

No, the manifold is not part of the engine casting. It is a separate part that is connected to the pump and the front of the transmission housing. It uses studs at the pump end and bolts at the transmission end. It looks like you have the nuts off of the studs at the pump end and the bolts removed at the transmission end. If it's not moving then I would apply some force downward at the pump end to see if it starts to move at the transmission end. If not, then maybe heat or a pry bar at the transmission end.

3N · Mar 19, 2022

Sorry Sean. Yes, I was wrong about the manifold
being a part of the engine casting. You are right
about being a separate part. The pictures don't
show well what appears to be a sealant of some sort
at the joint. I'm stuck as to how to put more
force. Thanks for your reply.

Sean in PA · Mar 19, 2022

I just looked at it closer and it almost looks like JB Weld or something similar. If that's what it is, then good luck trying to get it apart. I do see a gap at the very bottom corner of where the manifold meets the transmission. You might try a blunt cold chisel in there and tap it with a hammer.

showcrop · Mar 19, 2022

You are perhaps very fortunate that you encountered this problem. I can see that there was probably something applied to the junction, but it couldn't have been applied in a manner that would enable it to stick to both surfaces. Whatever is in there shouldn't stand up to a very big hammer, while that manifold which is an aluminum casting, will take plenty of abuse. So go ahead and hit it, but only after you reassess your means of supporting your 640. You should have cribbing supporting the front, with wedges driven in between the top of the axle and bottom of the front frame. The rear should be supported by a rolling stand. This can consist of a trailer jack with the pivoting wheel under it, bolted rigidly to the side of the rear housing at the PTO lever plate through a fabricated bracket. The front is always blocked and the rear rolled. With it supported this way you could bump into it with a vehicle and it would not fall down. Be Safe!!

3N · Mar 19, 2022

Thank you, Showcrop, good information. In the past
I have moved the front end, and many people do. I'm
curious as to why you move rear end. Forgot about
wedges for front axle, thank you.

Dean · Mar 19, 2022

Carefully. The manifold is aluminum and finding a replacement for a vane pump will not be easy.

I would pop the pump loose from the engine first.

Dean

showcrop · Mar 19, 2022

(quoted from post at 12:26:52 03/19/22) Thank you, Showcrop, good information. In the past
I have moved the front end, and many people do. I'm
curious as to why you move rear end. Forgot about
wedges for front axle, thank you.

The only reason that I can see for moving the front is that it looks smaller because the wheels are smaller. The big rears, however, give you leverage making it push much more easily, and the rear can't tip over like the front can. Be Safe!

3N · Mar 19, 2022

Thank you for the insight and sharing.
I appreciate the help.

Opinion and ideas

3N

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Sean in PA

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Sean in PA

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