D4 7J1288 Transfer Pump info needed.

The valve in question is the pressure relief valve. If it's as you say, not in good shape, that could be the reason for low fuel pressure. Check with Cat and see if you can get another one along with a new spring, and check the seat where it sits. If that's worn, you might be able to take a file and lay it flat and file the seat a bit to clean it up.

Hi Colby,
here is some data on another thread on this subject going here at present.

http://www.acmoc.org/bb/showthread.php?13123-D2-5U-Fuel-Transfer-Pump
Hope this helps.
Cheers,
Eddie B.

Thanks everyone for the info! I called my local Cat dealer and the plunger for the relief valve part # 8B8917 updates to 9M4608 and is $51.15 (Canadian). Dad has an old trunk full of old D4 parts (Mostly new) so I will first do some rooting. I would like to completly rebuild the transfer pump but want all the info I can get before dissasembly. Are the two seals within the pump body rubber seals or just packings? It will give me a heads up of what to look for in the trunk as some of the part numbers on the pakages of the new parts in the trunk are worn off. Also will "Loctite 515 Gasket eliminator" be good enough to seal the pump layers? I have a few other pumps (smaller bolt hole pattern) to take apart (as a guinea pig) to get the feel of it. Perhaps with some measurements of these other pumps I could find tighter tollerance parts to make up a better pump??? Thanks again!