TM 5-4520-208-15
Section IV. OPERATOR'S MAINTENANCE
tween pulleys. V-belt deflection should
46. General
be from 1/4 to 1/2-inch.
a. The instructions in this section are pub-
(6) Tighten fuel pump mounting screws
lished for the information and guidance of the
to secure adjustment.
operator to maintain the BT400-40 and BT400
(7) Secure cabinet in place and engage
40-1 heaters.
cabinet latches.
b. Refer to TM 5-2805-208-14 for operator's
maintenance procedure as applicable- to the
48. Gasoline Engine Power Unit Fuel
Model 1A08-III Military Standard Engine.
Filter Service
47. V-Belt Adjustment
the fuel. Periodic checks must be made to
a. General. The V-belt is attached to the
determine if water has settled in the filter
drive pulley on the driven coupling, the fuel
sediment bowl.
pump drive pulley, and the magneto drive
pulley.
the V-belt as follows:
(1) On Model BT400-40 heaters, remove
cabinet by disengaging cabinet latches.
(2) On Model BT400-401 heaters, disen-
gage cabinet latches and open cabinet.
(3) Loosen two screws securing fuel pump
mounting bracket.
(4) Move fuel pump to the left to tighten
V-belt or to the right to place slack
in the belt. The elongated mounting
Figure 20. V-belt adjustment.
Figure 21. Engine power unit fuel filter services.
36
