TM 5-4520-208-15
(3) Remove four screws (3, fig. 29), lock-
for stretching and wear. Inspect pulley
washers (10), and nuts (11) and re-
for damage. Replace damaged parts.
move time totalizing meter (4).
d. Installation.
(4) Drive spring pin (6) from pulley and
(1) Position meter groove pulley (5, fig.
shaft and remove meter groove pulley
(5)
secure with spring pin (6).
c. Cleaning and Inspection.
(2) Install time totalizing meter (4) on
(1) Clean all parts except drive belt, with
bracket and secure with four screws
a cloth dampened with an approved
(3), lockwashers (10), and nuts (11).
cleaning solvent and dry thoroughly.
(3) Install meter drive belt (7) and mag-
(2) Inspect time totalizing meter for
neto pulley (14) (par. 82).
cracked case, broken glass, damaged
shaft, or other damage. Check belt
(4) Install power unit (para 12).
Section XVII. ELECTRIC MOTOR POWER UNIT
(2) Inspect electric motor for damage.
103. General
Check drive coupling and tapered
a. The electric motor power unit is furnished
bushing for cracks or damage. Inspect
as a part. of the Model BT400-40 heater. The
bracket for cracks, bends, or other
electric motor power unit requires a 208-220
damage. Weld minor cracks and
volt, 3-phase, alternating current power supply.
straighten bends. Replace all damaged
b. The electric motor power unit may be used
parts.
on the BT400-40-1 heater unit in the same
d. Installation.
manner as it is used on the BT400-40 heater.
(1) Install tapered bushing (4) on drive
The electric motor unit is a basic issue item
coupling (5) and install on motor
with the BT400-40 heater only.
shaft and secure with three screws
(2) and lockwashers (3). Position
104. Electric Motor Power Unit
tapered bushing and drive coupling
a. General. The electric motor power unit
on shaft and tighten screws to secure
and bracket mount on the same resilient mounts
taper lock.
provided to support the gasoline engine power
(2) Install electric motor (1) on bracket
unit.
(8) and install four bolts (6), eight
b. Removal.
flat washers (7), and self-locking nuts
(1) Remove the electric motor power unit
(13).
from the heater (para 12).
(3) Install electric motor power unit (para
(2) Remove four bolts (6, fig. 41), eight
flat washers (7), and four self-locking
motor power unit forward or to the
nuts (13) and remove electric motor
rear in slots on bracket to assure
(1) from bracket (8).
drive coupling mating with flexible
(3) Loosen three screws (2) and remove
rubber sleeve on fan shaft bearing.
drive couping (5) and tapered bush-
ing (4) from motor shaft by tapping
105. On-Off Switch
with a soft hammer or using a suitable
a. General. The toggle switch is mounted on
puller. Remove screws (2) and lock-
the side of the cover.
washers (3) and separate tapered
b. Removal.
bushing and drive coupling.
(1) Remove cabinet (para 12).
c. Cleaning and Inspection.
(2) Removal two screws (5, fig, 42) and
(1) Clean all parts with and approved
lift cover (4) away from junction box.
cleaning solvent and dry thoroughly.
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