The transmission has five hydraulically activated clutches. This gives the transmission three speeds FORWARD and three speeds REVERSE. Speed and direction are electronically selected by the operator.
If the machine is equipped with MVP, the machine has a high idle engine speed of 2000 rpm in neutral (only). While you operate within the speed ranges, the engine speed adjusts according to the load. The maximum engine speed is 2300 rpm.
If the machine is equipped with MVP, the machine has five speed ranges. The five speed ranges that are provided by MVP Allow the operator to find the best match between the following: machine speed,the machine application, ground conditions, and skill of the operator.
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| Illustration 1 | g00289007 |
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Clutch operation (typical example) (1) Piston (2) Spring (3) Plates (4) Ring gear (5) Discs (6) Clutch housing | |
The five transmission clutches are the disc type. These clutches are in separate housings. Each clutch has discs (5) and plates (3). The inside teeth of discs (5) are engaged with the outside teeth of ring gear (4). Notches on the outside diameter of plates (3) are engaged with pins in the clutch housing. The pins keep the plates from rotating.
In the example in illustration 1, springs (2) are between clutch housing (6) and piston (1). The springs keep the clutches disengaged. The clutches are engaged when oil is sent into the area behind piston (1).
When the pressure of the oil in the area behind the piston increases, the piston moves to the right. The piston moves against the force of spring (2), pushing the discs and plates together. The clutch is now engaged. The discs prevent ring gear (4) from rotating. When the clutch is released, the pressure in the area behind piston (1) decreases and the force of spring (2) moves the piston to the left. The discs and plates now move apart and the clutch is not engaged.
| Transmission Speed and Clutches Engaged | ||
|---|---|---|
| Transmission Speed | Direction | Transmission Clutches Engaged |
| First Speed | FORWARD | 2 and 5 |
| Second Speed | FORWARD | 2 and 4 |
| Third Speed | FORWARD | 2 and 3 |
| NEUTRAL | 3 | |
| First Speed | REVERSE | 1 and 5 |
| Second Speed | REVERSE | 1 and 4 |
| Third Speed | REVERSE | 1 and 3 |
Both a speed clutch and a direction clutch must be engaged in order to send power through the transmission.
| D6N | |||
| speed | speedMVP | ||
| Display | Speed | Speed | Display |
| 3F | |
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3.5 |
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3.0(1) | ||
| 2F | |
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2.5 |
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2.0(1) | ||
| 1F | |
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1.5 |
| N | 0 | 0 | N |
| 1R | |
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1.5R |
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2.0R(1) | ||
| 2R | |
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2.5R |
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3.0R(1) | ||
| 3R | |
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3.5R |
| (1) | These new speeds are obtained by holding the engine rpm to a reduced level. |
MVP is a system integration strategy that relies on communication between the engine, the transmission, and the monitoring system. A significant breakthrough in engine and power train electronic controls technology which causes the three-speed transmission to have 5 speed ranges has been developed. The engine speed in each speed range has been optimized in order to provide the following:
- Improved performance
- Improved fuel economy
- Improved drawbar pull
- Reduced noise
Multiple speed ranges allow the operator to find a better match between machine speed, the machine application, ground conditions, and the skill of the operator. System MVP has been designed to not only enhance machine performance, it has also been designed to extend component life by reducing shift forces in the power train system. On MVP equipped machines, the display module indicates the engine speed, the physical gear, the speed range within that gear and the direction. The display module will show one of the following speed ranges 1.5, 2.0, 2.5, 3.0 and 3.5.
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| Illustration 2 | g01897133 |
The display module indicates the following. the engine speed, the physical gear of the transmission, the speed range within the physical gear and the direction of the transmission If the machine is equipped with MVP, the display will show one of the following speed ranges: "1.5", "2.0", "2.5", "3.0", or "3.5". If the machine is not equipped with MVP, the display will show one of the following speed ranges: "1", "2", or "3".
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Autoshift - This status indicator is illuminated when the Bidirectional Auto Shift is active. |
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Auto Kickdown - This status indicator is illuminated when the auto kickdown is active. |
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| Illustration 3 | g01895259 |
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Transmission components (7) No. 1 ring gear (8) No. 1 clutch (REVERSE) (9) No. 2 and No. 3 carrier (10) No. 2 clutch (FORWARD) (11) No. 2 ring gear (12) No. 3 clutch (THIRD SPEED) (13) No. 3 ring gear (14) No. 4 carrier (15) No. 4 sun gear (16) No. 4 clutch (SECOND SPEED) (17) No. 4 ring gear (18) No. 5 clutch (FIRST SPEED) (19) Hub (20) Input shaft (21) Output shaft (22) Housing assembly (23) No. 4 planetary gears (24) No. 3 sun gear (25) No. 3 planetary gears (26) No. 2 planetary gears (27) No. 2 sun gear (28) Coupling gear (29) No. 1 planetary gears (30) No. 1 sun gear (31) No. 1 carrier | |
The transmission is fastened to the case at the rear of the machine. Power from the torque converter is sent to input shaft (20) by a drive shaft. Power flows from the transmission through output shaft (21). The power then goes from the output shaft to the transfer gears.
The No. 1 and the No. 2 clutches are the direction clutches. These clutches are located at the rear of the transmission. No. 1 clutch (8) is the REVERSE direction clutch. No. 2 clutch (10) is the FORWARD direction clutch.
The No. 3, No. 4, and No. 5 clutches are the speed clutches. No. 3 clutch (12) engages THIRD speed. No. 4 clutch (16) engages SECOND speed. No. 5 clutch (18) engages FIRST speed.
The No. 5 clutch is the only clutch that turns.
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| Illustration 4 | g01895376 |
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Power flow in first speed FORWARD. The No. 2 clutch and the No. 5 clutch engaged. (9) No. 2 and No. 3 carrier (10) No. 2 clutch (FORWARD) (11) No. 2 ring gear (12) No. 3 clutch (THIRD SPEED) (13) No. 3 ring gear (14) No. 4 carrier (15) No. 4 sun gear (16) No. 4 clutch (SECOND SPEED) (17) No. 4 ring gear (18) No. 5 clutch (FIRST SPEED) (19) Hub (20) Input shaft (21) Output shaft (22) Housing assembly (23) No. 4 planetary gears (24) No. 3 sun gear (25) No. 3 planetary gears (26) No. 2 planetary gears (27) No. 2 sun gear | |
When the transmission is in first speed FORWARD, No. 5 and No. 2 clutches are engaged. No. 2 clutch (10) holds No. 2 ring gear (11) stationary. No. 5 clutch (18) holds hub (19) stationary. Input shaft (20) turns No. 2 sun gear (27). No. 2 sun gear turns No. 2 planetary gears (26).
The No. 2 clutch holds No. 2 ring gear (11) stationary. This causes No. 2 planetary gears (26) to rotate inside No. 2 ring gear (11). The movement of No. 2 planetary gears (26) causes No. 2 and No. 3 carrier (9) to turn in the same direction as input shaft (20). As the No. 2 and No. 3 carrier turns, No. 3 planetary gears (25) turn. The No. 3 planetary gears turn No. 3 ring gear (13) and No. 3 sun gear (24). The No. 3 sun gear turns output shaft (21).
No. 3 ring gear (13) turns No. 4 carrier (14). As the No. 4 carrier turns, No. 4 planetary gears (23) turn. The No. 4 planetary gears turn No. 4 ring gear (17), which is connected to housing assembly (22) by splines. No. 4 planetary gears (23) also turn No. 4 sun gear (15). No. 4 sun gear turns output shaft (21).
As hub (19) is held stationary by No. 5 clutch (18), power is sent through the No. 5 clutch to hub (19). Hub (19) turns output shaft (21). As a result, torque to output shaft (21) is divided through No. 3 sun gear (24), No. 4 sun gear (15), and hub (19). From the output shaft, power goes through the transfer and bevel gears to the steering differential, the brake unit, the planetary and the brake unit.
When the transmission is in second speed FORWARD, No. 4 and the No. 2 clutches are engaged. No. 2 clutch (10) holds No. 2 ring gear (11) stationary. No. 4 clutch (16) holds No. 4 ring gear (17) stationary. Input shaft (20) turns No. 2 sun gear (27). No. 2 sun gear turns No. 2 planetary gears (26).
No. 2 ring gear (11) is held stationary by No. 2 clutch (10). This causes No. 2 planetary gears (26) to rotate inside No. 2 ring gear (11). The movement of No. 2 planetary gears (26) causes No. 2 and No. 3 carrier (9) to turn in the same direction as input shaft (20). As the No. 2 and No. 3 carrier turns, No. 3 planetary gears (25) turn. The No. 3 planetary gears turn No. 3 ring gear (13) and No. 3 sun gear (24). No. 3 sun gear turns output shaft (21). No. 3 ring gear (13) turns No. 4 carrier (14).
As a result, torque to output shaft (21) is divided through No. 3 sun gear (24) and No. 4 sun gear (15). From the output shaft, power goes through the transfer and bevel gears to the steering differential, the brake unit, the planetary, and the brake unit.
When the transmission is in third speed FORWARD, No. 2 and No. 3 clutches are engaged. No. 2 clutch (10) holds No. 2 ring gear (11) stationary. No. 3 clutch (12) holds No. 3 ring gear (13) stationary. Input shaft (20) turns No. 2 sun gear (27). No. 2 sun gear turns No. 2 planetary gears (26).
No. 2 ring gear (11) is held stationary by No. 2 clutch (10). This causes No. 2 planetary gears (26) to rotate inside No. 2 ring gear (11). The movement of No. 2 planetary gears (26) causes No. 2 and No. 3 carrier (9) to turn in the same direction as input shaft (20).
No. 3 ring gear (13) is held stationary by No. 3 clutch (12). Then, the movement of No. 2 and No. 3 carrier (9) causes No. 3 planetary gears (25) to rotate inside No. 3 ring gear (13). No. 3 planetary gears (25) turn No. 3 sun gear (24). No. 3 sun gear turns output shaft (21). From the output shaft, power goes through the transfer and bevel gears to the steering differential, the brake unit, the planetary, and the brake unit.
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| Illustration 5 | g00908095 |
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Power flow in first speed REVERSE. The No. 1 and the No. 5 clutches are engaged. (7) No. 1 ring gear (8) No. 1 clutch (REVERSE) (9) No. 2 and No. 3 carrier (10) No. 2 clutch (FORWARD) (11) No. 2 ring gear (12) No. 3 clutch (THIRD SPEED) (13) No. 3 ring gear (14) No. 4 carrier (15) No. 4 sun gear (16) No. 4 clutch (SECOND SPEED) (17) No. 4 ring gear (18) No. 5 clutch (FIRST SPEED) (19) Hub (20) Input shaft (21) Output shaft (22) Housing assembly (23) No. 4 planetary gears (24) No. 3 sun gear (25) No. 3 planetary gears (26) No. 2 planetary gears (27) No. 2 sun gear (28) Coupling gear (29) No. 1 planetary gears (30) No. 1 sun gear (31) No. 1 carrier | |
When the transmission is in first speed REVERSE, No. 1 and No. 5 clutches are engaged. No. 1 clutch (8) holds No. 1 ring gear (7) stationary. No. 5 clutch (18) holds hub (19) stationary.
Input shaft (20) turns No. 1 sun gear (30). No. 1 sun gear turns No. 1 planetary gears (29). No. 1 carrier (31) has a direct mechanical connection with No. 1 ring gear (7).
No. 1 ring gear (7) and No. 1 carrier (31) are held stationary by No. 1 clutch (8). The movement of No. 1 planetary gears (29) causes coupling gear (28) to turn in the opposite direction as input shaft (20). Coupling gear (28) has a direct mechanical connection with No. 2 and No. 3 carrier (9).
As the No. 2 and No. 3 carrier (9) turns, No. 3 planetary gears (25) turn. The No. 3 planetary gears turn No. 3 ring gear (13) and No. 3 sun gear (24). No. 3 sun gear turns output shaft (21). No. 3 ring gear (13) turns No. 4 carrier (14). As the No. 4 carrier turns, No. 4 planetary gears (23) turn. The No. 4 planetary gears turn No. 4 ring gear (17), which is connected to housing assembly (22) by splines. The No. 4 planetary gears (23) also turn No. 4 sun gear (15). No. 4 sun gear turns output shaft (21).
As hub (19) is held stationary by No. 5 clutch (18), power is sent through the No. 5 clutch to hub (19). The hub turns output shaft (21).
As a result, torque to output shaft (21) is divided through No. 3 sun gear (24), No. 4 sun gear (15), and hub (19). From the output shaft, power goes through the transfer and bevel gears to the steering differential, the brake, the planetary, and the brake units.
When the transmission is in second speed REVERSE, No. 1 and No. 4 clutches are engaged. No. 1 clutch (8) holds No. 1 ring gear (7) stationary. No. 4 clutch (16) holds No. 4 ring gear (17) stationary. Input shaft (20) turns No. 1 sun gear (30). No. 1 sun gear turns No. 1 planetary gears (29). No. 1 carrier (31) has a direct mechanical connection with No. 1 ring gear (7).
No. 1 ring gear (7) and No. 1 carrier (31) are held stationary by No. 1 clutch (8). The movement of the No. 1 planetary gears (29) causes coupling gear (28) to turn in the opposite direction of input shaft (20). Coupling gear (28) has a direct mechanical connection with No. 2 and No. 3 carrier (9). As the No. 2 and No. 3 carrier turns, No. 3 planetary gears (25) turn. The No. 3 planetary gears turn No. 3 ring gear (13) and No. 3 sun gear (24). No. 3 sun gear turns output shaft (21). No. 3 ring gear (13) turns No. 4 carrier (14).
No. 4 ring gear (17) is held stationary by No. 4 clutch (16). This causes No. 4 planetary gears (23) to rotate inside No. 4 ring gear (17). The movement of No. 4 planetary gears (23) and No. 4 carrier (14) causes No. 4 sun gear (15) to turn. The No. 4 sun gear turns output shaft (21).
As a result, torque to output shaft (21) is divided through No. 3 sun gear (24) and No. 4 sun gear (15). From the output shaft, power goes through the transfer and bevel gears to the steering differential, the brake unit, and the planetary unit.
When the transmission is in third speed REVERSE, No. 1 and No. 3 clutches are engaged. No. 1 clutch (8) holds No. 1 ring gear (7) stationary. No. 3 clutch (12) holds No. 3 ring gear (13) stationary. Input shaft (20) turns No. 1 sun gear (30). No. 1 sun gear turns No. 1 planetary gears (29). No. 1 carrier (31) has a direct mechanical connection with No. 1 ring gear (7).
No. 1 ring gear (7) and No. 1 carrier (31) are held stationary by No. 1 clutch (8). The movement of No. 1 planetary gears (29) causes coupling gear (28) to turn in the opposite direction as input shaft (20). Coupling gear (28) has a direct mechanical connection with No. 2 and No. 3 carrier (9).
As No. 3 ring gear (13) is held stationary by No. 3 clutch (12), the movement of No. 2 and No. 3 carrier (9) causes No. 3 planetary gears (25) to rotate inside No. 3 ring gear (13). No. 3 planetary gears (25) turn No. 3 sun gear (24). The No. 3 sun gear turns output shaft (21). From the output shaft, power goes through the transfer and bevel gears to the steering differential,the brake unit, and the planetary unit.
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| Illustration 6 | g00908097 |
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Power flow in NEUTRAL. The No. 3 clutch is engaged. (12) No. 3 clutch (THIRD SPEED) (13) No. 3 ring gear (20) Input shaft (21) Output shaft (26) No. 2 planetary gears (29) No. 1 planetary gears | |
When the transmission is in NEUTRAL, No. 3 clutch (12) is engaged. The No. 3 clutch holds No. 3 ring gear (13) stationary. Input shaft (20) turns No. 1 and No. 2 planetary gears (29) and (26). Neither No. 1 clutch nor No. 2 clutch are engaged, so there is no power flow to output shaft (21).