General Information
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| Illustration 1 | g01429233 |
(1) Gear (2) Hub assembly (3) Input shaft assembly (4) Clutch 1 (5) Gear (6) Clutch 2 (7) Gear (8) Hub assembly (9) Shaft assembly (10) Gear (11) Gear (12) Hub assembly (13) Gear (14) Gear (15) Gear (16) Gear (17) Clutch 4 (second speed) (18) Gear (19) Shaft assembly (20) Gear (21) Hub assembly (22) Hub assembly (23) Clutch 3 (reverse) (24) Gear (25) Gear (26) Hub assembly (27) Shaft assembly (28) Clutch 6 (first speed) (29) Gear (30) Clutch 5 (third speed and fourth speed) (31) Wave spring (32) Balance seal assembly (33) Output shaft assembly (34) Parking brake assembly | |
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| Illustration 2 | g01092462 |
(4) Clutch 1 (forward low) (6) Clutch 2 (forward high) (17) Clutch 4 (second speed) (23) Clutch 3 (reverse) (28) Clutch 6 (first speed) (30) Clutch 5 (third speed and fourth speed) (41) Pump oil (42) Torque converter oil (43) Lubricating oil (44) Machine ECM (45) Transmission relief valve (46) Torque converter (48) Torque converter outlet relief valve (49) Oil cooler (55) Torque converter inlet relief valve (56) Sump (57) Pump (58) Filter (59) Return oil (60) Dash panel (61) Engine ECM (62) Engine speed sensor (63) Ride control switch (64) Downshift switch (65) Shift lever (66) Direction control switch (67) Neutral override switch (68) Parking brake switch (69) Can Data Link (70) Brake pressure sensor (71) Autoshift switch (72) Key start switch (73) Torque converter output speed sensor (74) Transmission intermediate speed sensor 1 (75) Torque converter oil temperature sensor (76) Transmission output speed sensor 1 (77) Transmission intermediate speed sensor 2 (78) Transmission oil temperature sensor (79) Transmission output speed sensor 2 | |
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| Illustration 3 | g01092701 |
Transmission Hydraulic System (4) Clutch 1 (forward low) (6) Clutch 2 (forward high) (17) Clutch 4 (second speed) (23) Clutch 3 (reverse) (28) Clutch 6 (first speed) (30) Clutch 5 (third speed and fourth speed) (35) Solenoid for clutch 1 (forward low) (36) Solenoid for clutch 4 (second speed) (37) Solenoid for clutch 5 (third speed and fourth speed) (38) Solenoid for clutch 6 (first speed) (39) Solenoid for clutch 3 (reverse) (40) Solenoid for clutch 2 (forward high) (41) Pump oil (42) Torque converter oil (43) Lubricating oil (44) Machine ECM (45) Transmission relief valve (46) Torque converter (47) Modulating valve for clutch 2 (forward high) (48) Torque converter outlet relief valve (49) Oil cooler (50) Modulating valve for clutch 4 (second speed) (51) Modulating valve for clutch 5 (third speed and fourth speed) (52) Modulating valve for clutch 6 (first speed) (53) Modulating valve for clutch 3 (reverse) (54) Modulating valve for clutch 1 (forward low) (55) Torque converter inlet relief valve (56) Sump (57) Pump (58) Filter (59) Return oil | |
The machine ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the machine ECM. Some of the inputs that are considered are machine speed, engine speed and operator inputs.
When the engine is started, the transmission oil pump (57) pulls oil from the sump (56). Transmission oil pump (57) sends pump oil (41) through transmission oil filter (58). Pressurized transmission oil flows from the transmission oil filter to the oil inlet in the transmission housing. The pressurized oil flows through an internal passage of the transmission housing. The oil then flows to the transmission relief valve (45). The pressurized oil flows out of the transmission relief valve and into the following modulating valves: (7), (9), (11), (13), (16) and (18).
The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .
The transmission relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission relief valve (45) directs the unneeded pump oil to the torque converter (46) as torque converter oil (42). Torque converter outlet oil flows through torque converter outlet relief valve (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows through the lubrication system and to the sump (56) .
Table 1 gives the combination of the clutches that are engaged for each forward and each reverse speed. There is a modulating valve for each clutch. The modulating valve directs pressurized oil to the clutch in order to engage the clutch. A solenoid is located on each modulating valve. The solenoid controls the modulating valve spool. The machine ECM controls the solenoids.
| First speed forward | Second speed forward | Third speed forward | Fourth speed forward | Neutral | First speed reverse | Second speed reverse | Third speed reverse | |
| Clutch 1 (forward low) | X | X | X | |||||
| Clutch 2 (forward high) | X | |||||||
| Clutch 3 (reverse) | X | X | X | |||||
| Clutch 4 (second speed) | X | X | ||||||
| Clutch 5 (third speed and fourth speed) | X | X | X | X | ||||
| Clutch 6 (first speed) | X | X |
The countershaft transmission is a power shift transmission that has four forward speeds and three reverse speeds. The transmission has six clutches that are engaged hydraulically. Five of the clutches are disengaged by a coil spring. Clutch 6 (28) is disengaged by wave spring (31) and balance seal assembly (32). The balance seal assembly helps prevent the clutch from dragging if an engine overspeed condition occurs.
Balance seal assembly (32) and wave spring (31) are assembled inside the clutch piston. When clutch 6 is not engaged the force from the wave spring (31) and the pressure from the lube oil combine in order to move the clutch piston to the clutch disengaged position.
The transmission has five shafts: Input shaft assembly (3), output shaft assembly (33) and three gear shafts. Input shaft assembly (3) is driven by the torque converter turbine. Shaft assembly (9) contains clutch 1 (4) (forward low) and clutch 2 (6) (forward high). Shaft assembly (19) contains clutch 3 (23) (reverse) and clutch 4 (17) (second speed). Shaft assembly (27) contains clutch 5 (30) (third speed and fourth speed) and clutch 6 (28) (first speed).
Parking brake assembly (34) is mounted to the transmission case.
Each of the three transmission shafts that carry clutches have three internal oil passages. One passage is for carrying the oil for the lubrication and cooling of the clutches, bearings and gears. The other two passages are for carrying pressure oil for the engagement of the clutches on each shaft.
In order to transfer power through the transmission, a speed clutch and a direction clutch must be engaged.
Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.
First Speed Forward
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| Illustration 4 | g01429234 |
(1) Gear (2) Hub assembly (3) Input shaft assembly (4) Clutch 1 (5) Gear (9) Shaft assembly (11) Gear (14) Gear (15) Gear (19) Shaft assembly (20) Gear (22) Hub assembly (24) Gear (27) Shaft assembly (28) Clutch 6 (first speed) (29) Gear (33) Output shaft assembly | |
When the transmission is in FIRST SPEED FORWARD, clutch 1 (4) and clutch 6 (28) are engaged. Torque from the engine is transferred through the torque converter to input shaft assembly (3). Gear (1) is splined to input shaft assembly (3). Gear (1) turns gear (14) .
Gear (14) is splined to hub assembly (2) which causes the hub assembly to turn. Torque is transferred from input shaft assembly (3) through gear (1) and gear (14) to hub assembly (2). When clutch 1 (4) is engaged, torque is transferred from hub assembly (2) through the engaged clutch 1 to shaft assembly (9).
Gear (5) is part of shaft assembly (9). Gear (5) turns gear (11). Gear (11) is part of shaft assembly (19). Torque is transferred from shaft assembly (9) through gear (5) and gear (11) to shaft assembly (19) .
Gear (15) is splined to shaft assembly (19). Gear (15) turns gear (20) which is splined to hub assembly (22). Torque is transferred from shaft assembly (19) through gear (15) and gear (20) to hub assembly (22). When clutch 6 (28) is engaged, torque is transferred from hub assembly (22) through the engaged clutch 6 to shaft assembly (27) .
Gear (24) is splined to shaft assembly (27). Gear (24) turns gear (29) which is splined to output shaft assembly (33). Torque is transferred from shaft assembly (27) through gear (24) and gear (29) to output shaft assembly (33) .
Second Speed Forward
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| Illustration 5 | g01429238 |
(1) Gear (2) Hub assembly (3) Input shaft assembly (4) Clutch 1 (5) Gear (9) Shaft assembly (11) Gear (12) Gear (13) Hub assembly (14) Gear (17) Clutch 4 (18) Gear (19) Shaft assembly (24) Gear (27) Shaft assembly (29) Gear (33) Output shaft assembly | |
When the transmission is in SECOND SPEED FORWARD, clutch 1 (4) and clutch 4 (17) are engaged. Torque from the engine is transferred through the torque converter to input shaft assembly (3). Gear (1) is splined to input shaft assembly (3). Gear (1) turns gear (14) .
Gear (14) turns hub assembly (2). Torque is transferred from input shaft assembly (3) through gear (1) and gear (14) to hub assembly (2). When clutch 1 (4) is engaged, torque is transferred from hub assembly (2) through the engaged clutch 1 to shaft assembly (9) .
Gear (5) is part of shaft assembly (9). Gear (5) turns gear (11). Gear (11) is part of shaft assembly (19). Torque is transferred from shaft assembly (9) through gear (5) and gear (11) to shaft assembly (19).
When clutch 4 (17) is engaged, torque is transferred from shaft assembly (19) through the engaged clutch 4 to hub assembly (13). Gear (12) is splined to hub assembly (13). Gear (12) turns gear (18). Gear (18) is part of shaft assembly (27). Torque is transferred from hub assembly (13) through gear (12) and gear (18) to shaft assembly (27) .
Gear (24) is splined to shaft assembly (27). Gear (24) turns gear (29). Gear (29) is splined to output shaft assembly (33). Torque is transferred from shaft assembly (27) through gear (24) and gear (29) to output shaft assembly (33) .
Third Speed Forward
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| Illustration 6 | g01429239 |
(1) Gear (2) Hub assembly (3) Input shaft assembly (4) Clutch 1 (5) Gear (9) Shaft assembly (11) Gear (13) Hub assembly (14) Gear (15) Gear (19) Shaft assembly (20) Gear (22) Hub assembly (24) Gear (25) Gear (26) Hub assembly (27) Shaft assembly (29) Gear (30) Clutch 5 (33) Output shaft assembly | |
When the transmission is in THIRD SPEED FORWARD, clutch 1 (4) and clutch 5 (30) are engaged. Torque from the engine is transferred through the torque converter to input shaft assembly (3). Gear (1) is splined to input shaft assembly (3). Gear (1) turns gear (14) .
Gear (14) turns hub assembly (2). Torque is transferred from input shaft assembly (3) through gear (1) and gear (14) to hub assembly (2). When clutch 1 (4) is engaged, torque is transferred from hub assembly (2) through the engaged clutch 1 to shaft assembly (9) .
Gear (5) is part of shaft assembly (9). Gear (5) turns gear (11). Gear (11) is part of shaft assembly (19). Gear (11) turns gear (25). Gear (25) is splined to hub assembly (26). Torque is transferred from shaft assembly (9) through gear (5), gear (11), and gear (25) to hub assembly (26) .
When clutch 5 (30) is engaged, torque is transferred from hub assembly (26) through the engaged clutch 5 to shaft assembly (27) .
Gear (24) is splined to shaft assembly (27). Gear (24) turns gear (29). Gear (29) is splined to output shaft assembly (33). Torque is transferred from shaft assembly (27) through gear (24) and gear (29) to output shaft assembly (33) .
Fourth Speed Forward
Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.
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| Illustration 7 | g01429240 |
(1) Gear (2) Hub assembly (3) Input shaft assembly (5) Gear (6) Clutch 2 (7) Gear (8) Hub assembly (9) Shaft assembly (10) Gear (11) Gear (14) Gear (15) Gear (19) Shaft assembly (20) Gear (22) Hub assembly (24) Gear (25) Gear (26) Hub assembly (27) Shaft assembly (29) Gear (30) Clutch 5 (33) Output shaft assembly | |
When the transmission is in FOURTH SPEED FORWARD, clutch 2 (6) and clutch 5 (30) are engaged. Torque from the engine is transferred through the torque converter to input shaft assembly (3). Gear (7) is splined to input shaft assembly (3). Gear (7) turns gear (10) .
Gear (10) turns hub assembly (8). Torque is transferred from input shaft assembly (3) through gear (7) and gear (10) to hub assembly (8). When clutch 2 (6) is engaged, torque is transferred from hub assembly (8) through the engaged clutch 2 to shaft assembly (9) .
Gear (5) is part of shaft assembly (9). Gear (5) turns gear (11). Gear (11) is part of shaft assembly (19). Gear (11) turns gear (25). Gear (25) is splined to hub assembly (26). Torque is transferred from shaft assembly (9) through gear (5), gear (11), and gear (25) to hub assembly (26) .
When clutch 5 (30) is engaged, torque is transferred from hub assembly (26) through the engaged clutch 5 to shaft assembly (27) .
Gear (24) is splined to shaft assembly (27). Gear (24) turns gear (29). Gear (29) is splined to output shaft assembly (33). Torque is transferred from shaft assembly (27) through gear (24) and gear (29) to output shaft assembly (33) .
Neutral
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| Illustration 8 | g01429241 |
(3) Input shaft assembly (4) Clutch 1 (6) Clutch 2 (9) Shaft assembly (17) Clutch 4 (19) Shaft assembly (23) Clutch 3 (28) Clutch 6 (30) Clutch 5 | |
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Torque from the engine is transferred through the torque converter to input shaft assembly (3). Since only a speed clutch is engaged, there is no torque transfer from input shaft assembly (3) to either shaft assembly (9) or shaft assembly (19) .
First Speed Reverse
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| Illustration 9 | g01429242 |
(1) Gear (3) Input shaft assembly (15) Gear (16) Gear (19) Shaft assembly (20) Gear (21) Hub assembly (22) Hub assembly (23) Clutch 3 (24) Gear (27) Shaft assembly (28) Clutch 6 (29) Gear (33) Output shaft assembly | |
When the transmission is in FIRST SPEED REVERSE, clutch 3 (23) and clutch 6 (28) are engaged. Torque from the engine is transferred through the torque converter to input shaft assembly (3). Gear (1) is splined to input shaft assembly (3). Input shaft assembly (3) turns gear (16) .
Gear (16) turns hub assembly (21). Torque is transferred from input shaft assembly (3) through gear (1) and gear (16) to hub assembly (21). When clutch 3 (23) is engaged, torque is transferred from hub assembly (21) through the engaged clutch 3 to shaft assembly (19) .
Gear (15) is splined to shaft assembly (19). Gear (15) turns gear (20) which is splined to hub assembly (22). Torque is transferred from shaft assembly (19) through gear (15) and gear (20) to hub assembly (22). When clutch 6 (28) is engaged, torque is transferred from hub assembly (22) through the engaged clutch 6 to shaft assembly (27) .
Gear (24) is splined to shaft assembly (27). Gear (24) turns gear (29). Gear (29) is splined to output shaft assembly (33). Torque is transferred from shaft assembly (27) through gear (24) and gear (29) to output shaft assembly (33) .
Second Speed Reverse
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| Illustration 10 | g01429245 |
(1) Gear (3) Input shaft assembly (12) Gear (13) Hub assembly (16) Gear (17) Clutch 4 (18) Gear (19) Shaft assembly (21) Hub assembly (23) Clutch 3 (24) Gear (27) Shaft assembly (29) Gear (33) Output shaft assembly | |
When the transmission is in SECOND SPEED REVERSE, clutch 3 (23) and clutch 4 (17) are engaged. Torque from the engine is transferred through the torque converter to input shaft assembly (3). Gear (1) is splined to input shaft assembly (3). Input shaft assembly (3) turns gear (16).
Gear (16) turns hub assembly (21). Torque is transferred from input shaft assembly (3) through gear (1) and gear (16) to hub assembly (21). When clutch 3 (23) is engaged, torque is transferred from hub assembly (21) through the engaged clutch 3 to shaft assembly (19) .
When clutch 4 (17) is engaged, torque is transferred from shaft assembly (19) through the engaged clutch 4 to hub assembly (13). Gear (12) is splined to hub assembly (13). Gear (12) turns gear (18). Gear (18) is part of shaft assembly (27). Torque is transferred from hub assembly (13) through gear (12) and gear (18) to shaft assembly (27) .
Gear (24) is splined to shaft assembly (27). Gear (24) turns gear (29). Gear (29) is splined to output shaft assembly (33). Torque is transferred from shaft assembly (27) through gear (24) and gear (29) to output shaft assembly (33) .
Third Speed Reverse
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| Illustration 11 | g01429247 |
(1) Gear (3) Input shaft assembly (11) Gear (16) Gear (19) Shaft assembly (21) Hub assembly (23) Clutch 3 (24) Gear (25) Gear (26) Hub assembly (27) Shaft assembly (29) Gear (30) Clutch 5 (33) Output shaft assembly | |
When the transmission is in THIRD SPEED REVERSE, clutch 3 (23) and clutch 5 (30) are engaged. Torque from the engine is transferred through the torque converter to input shaft assembly (3). Gear (1) is splined to input shaft assembly (3). Input shaft assembly (3) turns gear (16) .
Gear (16) turns hub assembly (21). Torque is transferred from input shaft assembly (3) through gear (1) and gear (16) to hub assembly (21). When clutch 3 (23) is engaged, torque is transferred from hub assembly (21) through the engaged clutch 3 to shaft assembly (19) .
Gear (11) is part of shaft assembly (19). Gear (11) turns gear (25). Gear (25) is splined to hub assembly (26). Torque is transferred from shaft assembly (19) through gear (11), and gear (25) to hub assembly (26) .
When clutch 5 (30) is engaged, torque is transferred from hub assembly (26) through the engaged clutch 5 to shaft assembly (27) .
Gear (24) is splined to shaft assembly (27). Gear (24) turns gear (29). Gear (29) is splined to output shaft assembly (33). Torque is transferred from shaft assembly (27) through gear (24) and gear (29) to output shaft assembly (33) .