Upshifting
cen dm 08.12.001
- When operating off-highway, or under adverse conditions,
always use low gear (if so equipped) when starting to move the vehicle.
When operating on-highway, with no load, or under ideal conditions, use 1st gear when starting to move the vehicle.For all conditions, use the highest gear that is still low enough to start the vehicle moving with engine idling, and without slipping the clutch excessively.
- Use the clutch brake to stop gear rotation when shifting
into 1st or reverse when the vehicle is stationary. The clutch brake
is actuated by depressing 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.
- Do not make range shifts with the vehicle moving in reverse gear.
- The shift lever should not be moved to the center or left rail positions at vehicle speeds above 40 mph (65 km/h).
- Double-clutch between all upshifts and downshifts.
- After your shifting ability improves, you may want to skip some of the ratios. This may be done only when operating conditions permit, depending on the load, grade, and road speed.
- Avoid hunting for neutral by moving the gear shift lever from the left rail to right rail. This action can cause excessive transmission wear.
- Position the gear shift lever in neutral. Start the engine, and bring the air system pressure up to 100 to 120 psi (689 to 827 kPa).
- Depress the clutch pedal to the floor. Shift into 1st gear, then engage the clutch, with the engine at or near idle speed, to start the vehicle moving.
- Button-only shift—Preselect the next gear by sliding
the shift button forward. Break torque by releasing the throttle or
by depressing the clutch pedal. Decrease engine speed to synchronize
the engine speed with the transmission speed. The shift will complete
when the engine rpm has decreased to the proper speed.The button-only shift is used for gear changes from 1st to 2nd, 3rd to 4th, 5th to 6th, 7th to 8th, and 9th to 10th.
- Lever-only shift—Break torque by releasing the throttle
and depressing the clutch pedal. Double-clutching, move the shift
lever to the next desired gear position. Decrease engine speed to
synchronize the engine speed with the transmission speed. The shift
will complete when the engine rpm has decreased to the proper speed.The lever-only shift is used to skip a full gear. With the shift button rearward—1st to 3rd, 3rd to 5th, 5th to 7th, and 7th to 9th. With the shift button forward—2nd to 4th, 4th to 6th, 6th to 8th, 8th to 10th.
- Combination button/lever shift—Preselect the next
gear by sliding the shift button rearward. Break torque by releasing
the throttle and depressing the clutch pedal. Double-clutch and move
the shift lever to the next desired gear position.
The combination button/lever shift is used for gear changes from 2nd to 3rd, 4th to 5th, 6th to 7th and 8th to 9th.
Caution: Keep the transmission in gear at all times while the vehicle in motion. Coasting in neutral could lead to transmission damage.
Note: Lever-only shifts skip an entire gear ratio and will require the engine rpm to decrease twice the amount of a normal shift.
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