Downshift through the low range gears as condi-
tions require.
For 18-speed transmissions:
Continue downshifting from 4th overdrive to 4th
direct, then 4th direct to 3rd overdrive, 3rd over-
drive to 3rd direct, etc. Single-clutch when split
shifting (direct to overdrive, overdrive to direct).
Double-clutch when making lever shifts (4th to
3rd, 3rd to 2nd, etc.).
IMPORTANT: Never use the clutch brake when
downshifting, or as a brake to slow the vehicle.
Eaton Fuller Deep-Reduction
Transmissions
Refer to the Eaton website for additional information,
www.roadranger.com
.
General Information, Deep Reduction
10-Speed RT, RTO and RTX Models
Eaton Fuller 10-speed deep-reduction transmissions
have a 5-speed front section, and a 2-speed rear-
range section, with a deep reduction gear. The low-
low, deep reduction gear is used only when operating
under adverse conditions. Low gear in the front sec-
tion is used only for rough, off-highway conditions, as
a starting ratio. The remaining four forward positions
are used once in the low range and once in the high
range. See
Fig. 8.19
for the shift pattern.
NOTE: The 3rd/7th and 4th/8th shift positions in
the RT and RTX-LL transmissions are opposite
of the RTO-LL transmissions.
15-Speed RT, RTO, and RTX Models
Eaton Fuller 15-speed deep-reduction transmissions
have a 5-speed front section, and a 2-speed rear-
range section. They also have five additional deep
reduction ratios. The 5-speed front section, and the
low and high range sections provide ten evenly and
progressively spaced forward speeds. The five deep
reduction ratios are also evenly and progressively
spaced; however, they do overlap the low range ra-
tios, and should be used only when operating under
adverse conditions. See
Fig. 8.20
for the shift pat-
terns.
NOTE: The 4th/9th, and the 5th/10th shift posi-
tions in the RT (direct ratio) and RTX (overdrive
ratio) transmissions are directly opposite in the
RTO (overdrive ratio) transmissions.
Operation, Deep Reduction
IMPORTANT: The shifter knob has an interlock
feature that prevents the deep reduction button
from being moved forward when the range pre-
selection lever is up (in high range); when in low
range and the deep reduction button is in the
forward position, the range preselection lever
cannot be moved up.
1.
For all driving conditions, use the highest gear
that is still low enough to start the vehicle moving
with the engine idling, and without slipping the
clutch excessively.
2.
Use the clutch brake to stop gear rotation when
shifting into low-low, low-1st (whichever is used
as a starting ratio) or reverse, when the vehicle
is stationary. The clutch brake is actuated by de-
pressing the clutch pedal all the way to the floor.
For normal upshifts and downshifts, only a partial
disengagement of the clutch is necessary to
break engine torque.
3.
Double-clutch between all upshifts and down-
shifts.
4.
Never move the shift lever into low gear while in
high range.
1
4
5
8
6
7
3
2
1
3
5
7
2
6
8
4
A
B
C
D
E
F
1
03/13/96
f260026a
N
N
A. All RTO Transmissions
B. All RT and RTX Transmissions
C. High Range
D. Low Range
E. Deep Reduction IN (forward)
F.
Deep Reduction OUT (rearward)
1.
Deep Reduction Button
Fig. 8.19, Eaton Fuller 10-Speed RT, RTO and RTX
Model Transmissions Shift Patterns
Transmissions
8.21
