There is no special valve to turn, but it is necessary to install a special
diverter plug into an internal port in the rockshaft cylinder head. The
part number is PT13744. This is a MAJOR task requiring removal of both
fenders and the front seat mounting bracket plus disconnecting MFWD and
transaxle linkages. The procedure is described in the Installation
Instructions (M115181) that come with the kit. It is 12 pages long and
contains many photos. You will need this in order to install the plug.
I recommend you order the plug and the Instructions from your JD dealer. If
the dealer has installed such a kit on other tractors he will probably still
have these instructions on file. If your local dealer doesn't have them,
then try another. Any dealer who sold a JD backhoe on 755, 855, and 955
tractors had to first install the diverter plug so someone undoubtedly has
the Instructions available.
If all else fails, E-Mail me with your mailing address and I will send you a
photocopy of my instructions. No guarantee on quality since there are many
dark photos that may not come through clearly on another copy. You will
still have to order the diverter plug.
Good luck.
JackIL