GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
Section I. BLOWER ASSEMBLY
13. Description and Function
Remove four screws (6) that fasten
The blower assembly (fig. 6) consists of a six-
locking coupling adapter (10) to left-hand
bladed cast iron impeller that rotates in a two-piece cast
blower casing (8).
aluminum casing. The blower casing is fastened by four
coupling adapter and gasket (11).
screws to a blower mount that is in turn fastened to the
Remove cap screw (15), lockwasher (14),
engine or motor stand assembly by four capscrews. The
and flat washer (13). Using a suitable
impeller is fastened to the gasoline engine shaft or
puller, remove impeller (7), and drive
motor output shaft by a capscrew and two washers. A
bushing (12) from shaft.
slotted brass drive bushing is used as a collet to prevent
Remove four screws (6) fastening right
rotation of the impeller on the drive shaft. A locking
hand blower casing to blower mount (2).
coupling at the outlet of the blower casing provides a
Lift off casing.
means for converting the air outlet hose. An adapter at
Remove four capscrews (19) and
the blower inlet provides connection of the locking
coupling on the air inlet hose. The function of the
(2) to engine stand assembly. Lift off
blower assembly is described in TM 3-4240-241-12.
blower mount and blower gasket (1).
b. Cleaning and Inspection.
General support maintenance personnel are
authorized to replace the blower gasket and mount,
(1) Clean all metal parts of the blower with
blower casings, impeller, drive bushing, locking
coupling, coupling tube, adapter and attaching
(2) Inspect blower casings, impeller, locking
coupling, and locking coupling adapter for
cracks. These are cast parts and require
careful inspection, especially around
a. Removal and Disassembly (fig. 6). The blower
screw holes and base of flanges and
can be removed along with the gasoline engine (para
impeller blades. Replace the impeller if it
10a) or electric motor (para 12a). The blower is
is cracked or broken.
removed from the shaft of the gasoline engine or
electric motor and disassembled as follows:
(3) Check to see if both dowel pins are tight
in locking coupling adapter and that slots
(1) Remove four drive screws (18) which
for dowel pins in locking coupling are not
fasten locking coupling tube (16) to blower
broken or worn excessively.
air outlet. Slide tube from outlet and
separate locking coupling (17) from
locking coupling tube.
(2) Remove eleven machine screws (9) and
(1) Use a round file and deepen the slots in
nuts (4) that fasten left-hand and right-
locking coupling until it will lock securely
hand blower casings (8 and 5) together.
to a mating adapter.
Lift off left-hand blower casing.