Upshifting
There are several patterns of upshifting, depending on the vehicle load and the road conditions. See Table. for suggested shifting sequences. Deep reduction gears are best suited for heavy loads and steep inclines. Low gear (in 10-speed transmissions) is best suited for off-highway use.
The following instructions are recommended for starting a loaded vehicle moving, under adverse conditions.
- Position the gear shift lever in neutral. Start the engine, and bring the vehicle air system pressure up to 100 to 120 psi (689 to 827 kPa).
- Position the range preselection lever down, into low range.
- Move the deep reduction button to the forward position, to engage the deep reduction gears.
- Depress the clutch pedal to the floor; shift into low-low
gear (10-speed transmissions) or 1st gear of deep reduction (15-speed
transmissions); then engage the clutch, with the engine at or near
idle speed, to start the vehicle moving. Accelerate to 80 percent
of engine governed speed.
Table 1, Eaton Fuller Shift Progressions
Eaton Fuller Shift Progressions
TRANSMISSION MODEL
DEEP REDUCTION
LOW RANGE
HIGH RANGE
Adverse Conditions Only
Off-Highway and Adverse Conditions
On-Highway and Ideal Conditions
All Conditions
10-Speed RTO
10-Speed RTX
15-Speed RTO
15-Speed RT and RTX
Table 1, Eaton Fuller Shift Progressions
- For 10-speed transmissions:When ready for the next upshift, move the deep reduction button rearward, then break the torque on the gears by momentarily releasing the accelerator or depressing the clutch pedal. Do not move the shift lever.For 15-speed transmissions:Shift upward from 1st gear of deep reduction to 5th gear of deep reduction, double-clutching between shifts and accelerating to 80 percent of engine governed speed. See Table..When ready for the next upshift, move the deep reduction button from the forward position to the rearward position, then double-clutch through neutral, and move the shift lever to the 4th gear position in the low range.
- Shift upward from low gear (10-speed transmissions) or 4th gear (15-speed transmissions), to the top gear in low range (see Table.), double-clutching between shifts, and accelerating to 80 percent of engine governed speed.
- While in the top gear of the low-range shift pattern, and ready for the next upshift, flip the range preselection lever up into high range. Double-clutch through neutral, and shift into the bottom gear in high range (see Table.). As the shift lever passes through neutral, the transmission will automatically shift from low range to high range.
- With the transmission in high range, shift progressively upward through each of the high range gears (see Table. ), double-clutching between shifts.