supply roll so that the leading edge of the cellophane or
plastic faces away from the housing and feeds from the bot-
tom of the roll. Engage the left slot of the roll with the left
pivot. Pull the right supply roll knob out, and slide the
right side of the roll in until the slot engages with the pivot.
Grasp the leading edge of the cellophane or plastic and feed
it through the slot formed by the rear of the front shelf and
the front of the projection stage; pull it up and over the
projection stage to the takeup roll in the rear of the housing.
Lay the leading edge of the cellophane or plastic over the top
of the takeup roll and attach with tape. When the takeup
knob is turned clockwise, the cellophane or plastic is wound
on the takeup roll.
Page 41, paragraph 38. Delete paragraph 38 and substitute:
38. Rust and Corrosion
Remove rust, and corrosion from metal surfaces by lightly sanding
them with fine sandpaper. Brush two thing coats of paint on the
bare metal to protect it from further corrosion. Refer to the appli-
cable cleaning and refinishing practices specified in TM 9-213.
Figure 22. Delete figure 22.
Page 42, figure 23. Delete figure 23.
Figure 23.1 (page 2 of C1). Make the following changes: Caption.
After "lubrication points" add: (PH-637/PFP, PH-637A/PFP, and
Add the following note below the figure :
Note. On the PH-637C/PFP, the oil cups are located on top of the motor.
Page 43, parapraph 39c (page 1 of C1, page 7 of C2). Delete sub-
paragraph c and substitute:
c. Blower Motor. Lubricate the blower motor semiannually, as
Note. Equipment procured on Order No. AF33 (600)23384 does not require
blower motor lubrication.
(1) Remove the projection head assembly by racking the projec-
tion head up off the support post, and set it carefully to one
(2) Carefully lay the housing on its side, on a level working
(3) On the PH-637/PFP and the PH-637A/PFP, remove the
b o t t o m c o v e r ( p a r . 55e(4)). On the PH-637B/PFP, re-
move the six bottom cover mounting screws (fig. 29.1) that
secure the bottom cover, and lift off the bottom cover to reach