Refer to Page PM13, install the Air Operated PTO
Shift as follows: Oil o-rings (Item 3), install on
adaptor (Item 50). Place adaptor over shift shaft and
into the PTO housing with the counterbored end
outboard. Place o-ring (Item 11) carefully over the
end of the shift shaft. Position spring (Item 51) over
the shift shaft and into the adaptor (Item 50). Place
bump ring (Item 13) over spring (Item 51). Move
shift collar and restrain to make shift shaft project as
far as possible. Install piston (Item 9), washer (Item
7) and nut (Item 6). Tighten nut to specified torque.
Install felt ring (Item 10) (after soaking in transfer
case lubricant) in wide groove of piston. Oil o-ring
(Item 8) and install in the outboard groove of the
piston. Install cylinder cap. Slip the shift cylinder
tube (Item 43) (31/8" long) over the piston, onto the
adapter. Fit the shift cylinder cap into place and
install the four capscrews that retain the assembly to
the PTO unit, tighten to the specified torque.
Install the indicator light switch (Item 20) with same
disassembly. Check switch operation with a
continuity tester (and air pressure applied to the shift
cylinder, if so equipped).
10. Install the blanking sleeve (Item 70) on the PTO
output to seal the output shaft section of the PTO, if
a yoke is not to be installed immediately.
11. The PTO unit includes an oil pump that consists of
items 73 through item 80 on Page PM12. Also refer
to Fig. 39. The piston (Item 73) is driven by the
eccentric section of shaft (Item 65). A check valve
(Item 74) is retained within the piston by a spring
type retaining ring (Item 75). This check valve must
be installed with the free flow direction and arrow
direction pointing toward the PTO shaft. This allows
a small portion of the oil pump output to be directed
onto the shafts eccentric surface. Screw nut (Item
77) onto cylinder (Item 79) with nylon portion pointing
away from the hexagon section of the cylinder. Coat
the piston, check valve and retaining
ring assembly with transfer case lubricant. Put the
spring (Item 76) into the counterbore of the piston
and then put the cylinder over the spring and piston.
Push the piston into the cylinder until the end of the
cylinder is just even with the port in the side of the
cylinder. The piston should move freely without
binding. Screw the cylinder into the PTO bearing
carrier (See Fig. 39). Rotate the PTO shaft to place
the high point
of the cam under the piston, screw the cylinder in
until the outer end of piston is visible short of the
cylinder side port. Rotate the PTO shaft to verify that
it is indeed on the high point of the cam. Screw the
cylinder in until the outer end of the piston is just
even with the side port; unscrew cylinder at least one
turn, but not more than one and one half turns;
tighten lock nut against the PTO bearing carrier with
one side port of the cylinder pointing in the direction
shown on Page PM15. Use pipe dope on all pipe
threaded fittings. Screw check valves (Item 80) into
place in the cylinder. The inlet check valve should
be installed (with the arrow pointing into cylinder) in
the end of the cylinder. The outlet valve should have
the arrow pointing away from the cylinder and should
be in the position shown on Page PM15 to allow the
hose (Item 4) to be used to connect the pump to
fitting (Item 5) at the front of the case.
Refer to section VI G, paragraph 12 for installation of
the PTO unit on the transfer case. Also See Fig. 33
and Fig. 37.
Refer to Page 2 and Page PM15 for the proper
installation of the oil lines. Also see Fig. 1, 2, and
10. Check oil flow out of oil pump upon installation.
Refer to Section III B of this manual.