PTO Hydraulic Operation

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Once the battery has been disconnected for any repairs, the vehicle will need to be driven a couple miles in order to relearn the PTO operation.

Non-PTO versions of the transmission have a source of fluid under line pressure to the 3-4 shift valve from the manual valve (OD circuit). In PTO versions the line circuit is the source.
When the vehicle is equipped for PTO operation, the transmission has changes to the hydraulic passages for the 3-4 shift valve. This allows the coast clutch to be applied in P, R, or N during PTO operation.
Non-PTO versions of the transmission have an exhaust path for the coast clutch through the REVERSE circuit. In PTO versions, a separate exhaust path for the coast clutch exists.
Due to these hydraulic features, the upper valve body, lower valve body and separator plate of the PTO versions of the transmission are unique.