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 TM 10-3930-630-12
(f) Disengage parking brake. Pressure
(i) Install floor and toe plates.
gage should indicate at least 95 psi at 2000 rpm with
(2) Inching control.
(a) Remove floor and toe plates.
transmission in R (reverse) position.
(g) Shut off engine. Remove gage and
(b) Operate truck and check inching
install plug in transmission control valve.
control operation. Truck should come to a full stop
(h) Install floor and toe plates.
when inching control pedal is completely depressed and
should move forward smoothly with the pedal released.
(c) Check brake pedal to see that it is fully
4-100. Neutral Start Switch
a. General. A pressure switch, actuated by the
retracted against brake stop (Fig. 4-84).
transmission, prevents the truck starter from operating
Spring should measure 11.0 to 11.25 inches (279.4 to
unless the transmission is in neutral. The switch is
285.7 mm) when inching pedal is retracted. If spring
mounted on the right side of the transmission control
length requires adjustment, loosen nut on adjusting
valve.
b. Removal.
screw and adjust length of spring as required.
(e) With the return spring at proper length,
(1) Place transmission in neutral and attempt
adjust inching pedal stop (Fig. 4-84) so that plunger
to start truck. If starter does not operate, replace switch.
spring (Fig. 4-84) is compressed to a length of 0.062 to
(2) Remove floor plate.
0.125 inches (1.57 to 3.17 mm).
(3) Disconnect wires from neutral start switch
(f) With the brake pedal against brake
stop (Fig. 4-84) set adjustment setscrew to allow a gap
openings in valve to prevent entrance of foreign
of 0.25 inch (6.35 mm) between brake pedal lug and
material.
c. Installation.
inching pedal setscrew. Lock setscrew with locknut.
(g) To check adjustments, raise front
(1) Remove plug from control valve.
wheels from floor and block truck in raised position.
(2) Install neutral start switch (Fig. 3-4)
Block rear wheels.
Operate truck and shift in F
securely in control valve. Connect wires to switch.
(forward) or R (reverse). With engine at high idle,
(3) Start truck engine to check operation. Shut
inching pedal should not move forward. If it does,
off engine.
repeat adjustments above. Shift lever to N (neutral),
(4) Install floor plate.
stop engine and lower truck to floor.
(h) To check transmission output, operate
4-101. Transmission Service
a. General. The transmission should be drained
truck and set parking brake. Return engine to low idle
and shift into forward or reverse.
Engine should
and refilled at specified intervals. Refer to current
approach a stall condition. Stop engine.
lubrication order for intervals and lubricant.
b. Service.
(3) Pressure Check
(a) Install a zero to 300 psi gage in
(1) Remove transmission filler cap and level
reverse clutch pressure port (Fig. 4-84).
gage (Fig. 3-4).
(b) Raise front of truck and block in
(2) Place
a
suitable
container
under
position.
transmission drain plug (Fig. 4-77). Remove plug and
(c) Engage parking brake. Depress brake
allow oil to drain.
pedal until shoes contact drums. This will occur when
(3) Remove transmission screen through oil
resistance to pedal movement is felt. Wedge a block of
drain plug hole. Clean screen in cleaning compound,
wood between brake pedal stop (Fig. 4-84) and pedal to
solvent (Fed. Spec. P-D-680) and blow dry with
hold brakes in applied position.
compressed air.
(d) Start engine. With engine at low idle
(4) Install screen in drain plug hole and install
(500 to
drain plug.
600 rpm) place transmission control lever in R (reverse).
(5) Service transmission filter (para 4-98).
Depress inching pedal until gage reads 6 to 10 psi.
(6) Refer to current lubrication order and fill
(e) Adjust inching pedal setscrew (Fig. 4-
transmission with correct grade of oil.
Install
transmission filler cap and level gage (Fig. 3-4).
84) to engage brake pedal lug at this point. Lock
setscrew with lock nut.
4-92
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