Eaton Fuller 13-Speed Splitter and
Range-Shift Transmissions
Eaton Fuller 13-speed transmissions have thirteen
forward speeds and two reverse speeds. Each trans-
mission consists of a 5-speed front section and a
3-speed auxiliary section. The auxiliary section con-
tains low- and high-range ratios, plus a splitter gear.
See
Fig. 14.1 for the shift pattern.
LOW gear is used only as a starting gear; it is never
used with the transmission in high range. The other
four ratios are used once in the low range and once
again in the high range.
High range gear ratios can be split by using the
splitter-control button with the underdrive ratio (RT
models), or overdrive ratio (RTO models). Low range
gear ratios cannot be split.
Upshifting
1.
Put the transmission in neutral. Start the engine
and bring the air system pressure up to 100 to
120 psi (689 to 827 kPa).
2.
Position the range-preselection lever down, in
low range.
3.
Make sure the splitter-control button is in the low
(rearward) position. See Fig. 14.1.
4.
To start the vehicle moving, press the clutch
pedal to the floor, shift into LOW or 1st gear,
then engage the clutch with the engine at or near
idle speed. Accelerate to 80 percent of engine
governed speed.
5.
Upshift from LOW (or 1st gear) through 4th gear,
double-clutching when moving the gear shift
lever, and accelerating to 80 percent of engine
governed speed.
6.
While in 4th gear, pull the range-preselection
lever up into high range and move the splitter-
control button to the low (rearward) position.
Double-clutch into 5th gear, engage the clutch,
and accelerate.
7.
Upshift progressively through the high range
gears.
To shift from 5th direct to 5th overdrive (or 5th
underdrive to 5th direct on RT model transmis-
sions), move the splitter-control button to the
high position, then immediately release the ac-
celerator. Press and release the clutch pedal,
then, accelerate again.
Continue upshifting through the shift pattern.
Double-clutch when moving the gear shift lever
(6th to 7th, etc.); single-clutch during split shifts
(6th direct to 6th overdrive, etc.).
Downshifting
IMPORTANT: Never use the clutch brake when
downshifting, or as a brake to slow the vehicle.
1.
To downshift from 8th overdrive to 8th direct (or
8th direct to 8th underdrive on RT model trans-
missions), move the splitter-control button to the
low position, then immediately release the accel-
erator. Press and release the clutch pedal, then
depress the accelerator pedal once the transmis-
sion has shifted.
2.
Start the downshift from 8th direct to 7th over-
drive by moving the splitter-control button to the
high position, then double-clutch into 7th gear.
3.
Downshift progressively through each of the high
range gears, alternating the procedures in steps
1 and 2 above until reaching 5th direct.
4.
When in 5th direct and ready for the downshift to
4th, push the range-preselection lever down and
move the splitter-control button to the high posi-
tion. Double-clutch into 4th gear, engage the
clutch, and depress the accelerator pedal.
5.
Continue downshifting from 4th gear to 1st gear,
as conditions require.
R
1
3
2
4
LOW
Dir
OD
55
Dir
OD
Dir
OD
Dir
OD
7
7
66 8 8
Hi
Lo
A
B
C
D
1
03/13/96
f260044a
N
A. High Range
B. Low Range
C. High (forward)
D. Low (rearward)
1. Splitter Control Button
Fig. 14.1, Eaton Fuller 13-Speed Transmission Shift
Pattern
Manual Transmissions and Clutch
14.2
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