TM 5-3810-300-24&P-3
Specifications 3.0
5. Remove the plug from the inside of the rotor
Install Service Rotor Front Stub Shaft
shaft by driving it out of the shaft and into the
rotor body.
1. Coat the new blower rotor front shaft with
lubriplate, or equivalent.
6. Clamp the rotor firmly in a vise with soft wood
blocks between the rotor and the vise jaws.
2. Use a suitable press arrangement, align the rotor
shaft with its hole in the rotor and press the shaft
7. Insert the puller screw (J 4254-1) with the collets
into the rotor to the height of the spacer (J 4254-
(J 4254-6) in the retracted position into the rotor
8).
shaft until the collets are beyond the shoulder on
the internal surface of the shaft.
3. Drill and ream a new .250" diameter, 2-1/2"'
deep pin hole in the rotor 120 from the existing
8. Push the collets on to the larger diameter of the
pin hole.
puller screw as shown. Remove the collet
expanding sleeve (J 4254-5).
4. Drive the new groove pin into the new hole. The
end of the pin must be 1/16" below the rotor
9. Coat the threads of the puller screw with an
surface.
extreme pressure lubricant.
5. Install a new core plug.
10. Pull the puller screw outward by hand until the
collets seat against the internal shoulder of the
6. Stake the pin and the core plug after installation
rotor shaft and maintain tension on the puller
and remove all raised burrs.
screw.
After the modified lower blower rotor assembly has been
11. While holding the puller screw in this position,
used in the re-assembly of the blower up to the point
place the following tool components, in the order
where the water pump intermediate drive coupling is to
named, over the puller screw: puller sleeve (J
be installed, install the new water pump intermediate
4254-2), puller sleeve cap (J 4254-3), thrust
drive coupling in accordance with the following
bearing, 1/2" plain washer and forcing nut (J
procedure.
4254-4).
Attach Water Pump Intermediate Drive
12. Tighten the forcing nut until it is finger tight.
Coupling to Blower Rotor
13. Thread the forcing nut on the puller screw to
1. Install the splined end of the water pump
remove the shaft from the rotor.
intermediate drive coupling into the lower blower
rotor front stub shaft.
14. Remove the rotor from the vise and shake the
rotor shaft plug and groove pin from the rotor
2. Insert the 5/16" bolt through the water pump
cavity.
coupling and thread it into the rotor shaft and
plug assembly.
3. Tighten the bolt to 15-19 lb-ft (20-26 Nm)
PAGE 273
