freightliner 122SD - Eaton Fuller 13-Speed and 18-Speed Splitter and Range-Shift Transmissions

Eaton Fuller 13-Speed and 18-
Speed Splitter and Range-Shift
Transmissions
For complete information on Eaton transmissions, go
to the Eaton Roadranger website, www.roadranger-
.com.
General Information, Eaton Fuller
Splitter and Range-Shift
Combination splitter and range-shift transmissions
allow the choice of two splitter ratios in each lever
position, as well as the additional ratio provided in
each lever position after shifting to the other range.
IMPORTANT: Not all lever positions are used in
each range, and the shift patterns vary between
transmissions. Be sure to read the shift pattern
decal on the dash, for the operating instructions
for the specific transmission installed in your ve-
hicle.
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 an overdrive
splitter gear. See
Fig. 13.1 for the shift pattern.
All of the 13 speeds are controlled with one shift
lever. A range-preselection lever and a splitter-control
button are built into the shift knob. The range-
preselection lever controls range selection and the
splitter-control button (located on the side of the shift
knob) controls gear splits.
Low gear in the front section is used only as a start-
ing ratio. The remaining four forward positions are
used once in the low range and once in the high
range. However, each of the four high range gear
positions can be split with the underdrive ratio (RT
models), or overdrive ratio (RTO models) of the split-
ter gear. Ratios cannot be split while the transmis-
sion is in low range.
18-Speed RTLO Splitter and Range-Shift
Models
Eaton Fuller 18-speed transmissions have 18 forward
speeds and four reverse speeds. These transmis-
sions consisting of a 5-speed front section and a
3-speed auxiliary section. The auxiliary section con-
tains low and high range ratios, plus an overdrive
splitter gear.
One ratio in the front section (low) is used as a start-
ing ratio; it is never used when the transmission is in
high range. Low gear can be split, to provide both a
direct and an overdrive ratio.
The other four ratios in the front section are used
once in low range, and once again in high range.
However, each of the five ratios (low–1–2–3–4) in
low range, and each of the four ratios (5–6–7–8) in
high range, can be split with the overdrive splitter
gear.
All of the 18 speeds are controlled with one shift
lever. A range-preselection lever and a splitter-control
button are built into the shift knob. The range-
preselection lever controls range selection and the
splitter-control button (located on the side of the shift
knob) controls gear splits.
Operation Tips, Eaton Fuller Splitter
and Range-Shift
IMPORTANT: The shifter knob has an interlock
feature that prevents the splitter-control button
from being moved forward when the range-
preselection lever is down (in low range); when
in high range and the splitter-control button is in
the forward position, the range-preselection
lever cannot be moved down.
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. Overdrive (forward)
D. Direct Drive (rearward)
1. Splitter Control Button
Fig. 13.1, Eaton Fuller 13-Speed Transmission Shift
Pattern
Manual Transmissions and Clutch
13.1