TRUCK SERVICE MANUAL
TRANSMISSION
GENERAL INFORMATION
1-5. OPERATING INSTRUCTIONS
a. Vehicle-Related Controls. For information on
controls which are related to the vehicle, refer to the
vehicle service manual. Refer also to Drivers Handbook
SA 1334.
b. Neutral (N). Place the shift selector at the
neutral position before starting the engine. A neutral
safety switch (on the transmission or in the selector
linkage) prevents starting the engine while the selector
lever is not at neutral. Apply the vehicle brakes and shift
Fig. 1-7 Transmission name plate
to neutral any time the engine is to be running while the
operator is not at the controls.
e. Power Takeoff Provisions
c. Forward Drive Ranges
(1) Transmissions
are
equipped
with
(1) Shifting from neutral. The engine should
provisions for mounting a power takeoff on the front,
be at idle speed when any shift from neutral to a drive
upper-left side of the transmission housing.
range is made.
(2) The PTO on the transmission housing i s
(2) Drive (D).
This range is the most
converter driven.
commonly used forward range. It includes all forward
f. Planetary Gearing, Clutches.
To drive in this range, simply depress the accelerator.
The transmission will start in first (second on HT
(2) In THIS
transmission, ratio for five
750DRD), and automatically upshift at the proper speeds
forward speeds and reverse are established by four
through all gears.
Downshifts also will occur
planetary gear sets. The planetary are controlled by six
automatically, in relation to speed and throttle position.
hydraulic applied clutches. All gearing is in constant
mesh.
(3) Drive 4 (4) In this range, the transmission
will start in first (second on HT 750DRD), and
automatically upshift, at the proper speeds, to the fourth
gear.
(4) Drive 3 (3). In this range, the transmission
will start in first AND automatically upshift, at the proper
speeds, to third gear.
(5) Drive 2 (2). In this range, the transmission
will start in first AND automatically upshift, at the proper
speeds, to second gear.
(6) Drive 1 (1). In this range, the transmission
will start in first gear. No automatic upshift will occur
unless governed speed is exceeded.
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