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Eaton Fuller 13-Speed and 18-
Speed Splitter and Range-Shift
Transmissions
For complete information on Eaton transmissions, go
to the Eaton website,
www.roadranger.com .
General Information, Eaton Fuller
Splitter and Range-Shift
Transmissions
Combination splitter and range-shift transmissions
allow the choice of two splitter ratios in each shift
knob position, as well as the additional ratios pro-
vided by a low range and a high range.
IMPORTANT: Not all ratios are used in each
range, and the shift patterns vary between
transmissions. Read the shift pattern decal on
the dash for the operating instructions for the
transmission installed in your vehicle.
Range-Shift
The range-preselection lever selects the low or high
range for each transmission ratio. It is used once
during an upshift sequence and once during a down-
shift sequence.
The range-preselection lever is down when in the low
range, and up when in the high range.
IMPORTANT: Always preselect range shifts
when upshifting or downshifting. Preselection
requires that the range lever be moved to the
necessary position before starting to shift.
When correctly preselected, range shifts are com-
pleted automatically as the lever is moved through
neutral and into the next gear. Preselecting range
shifts prevents damage to the transmission and pro-
vides for smoother shifts.
IMPORTANT: Never make a range shift while
moving in reverse.
Splitter Control
Dependent on the transmission model, some ratios
can be split using the splitter-control button (located
on the side of the shift knob).
IMPORTANT: Always preselect splitter shifts.
Preselection requires that the splitter-control
button be moved to the necessary position be-
fore starting to shift.
Preselecting splitter shifts allows for smoother and
faster shifting. However, do not delay: complete the
shift immediately after preselecting the split to avoid
unnecessary wear on transmission components.
IMPORTANT: Never make a splitter shift while
moving in reverse.
13-Speed RTLO Models
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. 13.1 for the shift pattern.
All thirteen speeds are controlled with one shift knob.
LOW gear in the front section is used only as a start-
ing gear; it is never used when the transmission is in
high range. The other four ratios are used once in
the low range and once again in the high range.
When in the high range, the gear ratios can be split
by using the splitter-control button with the under-
drive ratio (RT models), or overdrive ratio (RTO
models). When in the low range, the gear ratios can-
not be split.
IMPORTANT: The shift knob has an interlock
feature that prevents the splitter-control button
R
1 3
2
4
LOW
Dir OD
5 5
Dir OD
Dir
OD
Dir
OD
7 7
6 6 8 8
Hi
Lo
A
B
C D
1
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f260044a
N
A. High Range
B. Low Range C. High (forward)
D. Low (rearward)
1. Splitter Control Button
Fig. 13.1, Eaton Fuller 13-Speed Transmission Shift
Pattern
Manual Transmissions and Clutch
13.1