I picked up a new to me 87 John Deere 318 the other day and have come to find that the trans / pump needs a little attention.
The first issue that I wanted to discuss is how much hydro whine is normal? I've found several forums discussing that the hydro whine is normal and others saying that it is not. I'm planning on rebuilding the hydro pump and trans soon but want to make sure I have the right parts available before hand. From what some were discussing it seems like I might need a charge valve shim kit or an entire new valve assembly. Mind you the hydro whine is not under a heavy load ... usually on takeoff until it is up to speed and when turning the wheels no matter how much. Can anyone shed any light on this?
Following up on the rebuild - does anyone have a list of cross reference seals for the hydro pump and seals in the trans? I've rebuilt a couple Wheel Horse trans and a Hydro Cub Trans similar to the 318 and was able to find seal sizes online and cross reference P/N's but I've not come across anything for the 318. Could someone post a list of sizes or Chicago Rawhide seal numbers? The prices that John Deere has for their oil seals seem really high - more so than Cub Cadet and I thought those were high ...
Lastly can anyone tell me what model differential this tractor has? From my research it appears to have a Tecumseh unit but when I flipped through WFM Files - I didnt see one that looks similar to the one in the 318. Also if anyone could also confirm the hydro pump model that would be great too!