TM 5-3655-210-12
4-115. Power Compartment Heater (Ser. Nos. L-
(25) Tag the leads and remove the two screws
1475-T through L-1478-T)
securing the two wires to the stack switch.
a. Removal
(26) Remove the nut (13) securing the ground
lead to the frame.
(1) Disconnect the lead connector (5, fig. 4-
(27) Remove the two cap screws (12), nuts,
113). Close coolant line shutoff valve. Prepare to drain
and washers securing the harness to the heater.
residual fluid from heater and connective lines (about 3
(28) Remove the screw securing the wire to
quarts) 2.85 liters) into a container. If clean, save
the ignition unit (3, fig. 4-106).
coolant for use.
(29) Remove the cap screw (2), nut, and
(2) Loosen the four hose clamps (11)
washer and the two screws (5), nuts, and washers
securing the two hoses (13) to the heater (6) and the
securing the wiring harness to the heater. Remove the
coolant lines (14).
harness.
(3) Remove the four cap screws (9) and lock
(30) Remove the four screws (8), nuts, and
washers (10) securing the heater (6) and the four
washers securing the ignition unit to the frame. Remove
mounts (8) to the floor (7).
the ignition unit.
(4) Slide the two hoses (13) off the heater
and lift out the heater (6) and the four mounts (8).
WARNING
(5) Remove the two hoses (13) off the lines
Dry cleaning solvent, P-D-680 or P-S-
(14) and slide the four clamps (11) from the hoses.
661, used to clean parts is potentially
WARNING
dangerous to personnel and property.
Use in a well-ventilated area as the
Dry cleaning solvent, P-D-680 or P-S-
fumes are dangerous if inhaled. Avoid
661, used to clean parts is potentially
repeated and prolonged skin contact.
dangerous to personnel and property.
Do not use near open flame or
Use in a well-ventilated area as the
excessive heat. Flash point of solvent
fumes are dangerous if inhaled. Avoid
is 100F.-138F. (38C.-59C.).
repeated and prolonged skin contact.
Do not use near open flame or
b. Cleaning, Inspection and Repair. Wipe all parts
excessive heat. Flash point of solvent
with a cloth dampened in a cleaning solvent. Inspect for
is 100F.-138F. (38C.-59C.).
broken or cracked wires and connections. Repair minor
b. Cleaning, Inspection and Repair. Clean the
damage. If the wiring harness is badly damaged,
replace the harness. Inspect the damaged threads and
heater sheet metal with a cloth dampened in a cleaning
replace any damaged hardware. Inspect 'the ignition
solvent. Wash all other metal parts in a solvent.
unit for damage. Replace a damaged unit or report the
Inspect the heater for cracked or frayed wire. Repair a
damage to the proper authority.
damaged wire or connector. Report any other damage
c. Installation. Reverse the removal procedures in
to the heater to the proper authority. Inspect for cracked
a above.
or damaged hoses and clamps, damaged threads, or
d. Vibrator Replacement. The vibrator (28, fig. 4-
any other damage. Replace all damaged parts.
c. Installation.
106) has two sets of contact points. The switch (32) is
safety wired at the factory. If the vibrator is inoperative
(1) Position the four clamps (11, fig. 4-113)
and the switch is still wired, cut the wire and pull the
on the two hoses (13) and slide the hoses far enough on
switch out. If the lock wire(33) has been cut, the switch
the two lines (14) to allow the heater (6) to be installed.
pulled out and the vibrator is inoperative install a new
(2) Position the heater (6) and the four
vibrator as follows.
mounts (8) on the floor (7) and secure with the four lock
(1) Unplug the disconnect plug (31).
washers (10) and cap screws (9).
(2) Loosen the thumb screw (27) and push
(3) Couple the connector (5).
the bail downward.
(3) Pull the vibrator (28) from the ignition unit
4-116. Power Compartment Heater (Serial Nos. L-
(3).
1666-T through L-1668-T
(4) Push the switch (32) in, and secure with
the lock wire (33).
(5) Position the new vibrator (28) in the
a. Removal.
ignition unit (3) and secure with the bail and thumb
(1) Disconnect the lead connector(3, fig. 4-
screw (27).
114). Close coolant line shutoff valve. Open drain cock
(6) Plug in the disconnect plug (31).
(6)
4-127
