938G Series II Wheel Loader and IT38G Series II Integrated Toolcarrier Power Train Transmission Power Flow Caterpillar


Transmission Power Flow
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1.1. General Information
2.1. First Speed Forward
3.1. Second Speed Forward
4.1. Third Speed Forward
5.1. Fourth Speed Forward
6.1. Neutral
7.1. First Speed Reverse
8.1. Second Speed Reverse
9.1. Third Speed Reverse

General Information




Illustration 1g00992664



Illustration 2g00929509

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train 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 control valve in order to supply transmission main relief valve (45) with oil. The transmission main relief valve maintains a constant pressure to the following modulating valves: (47), (50), (51), (52), (53) and (54).

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 (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 power train ECM controls the solenoids.

Table 1
    First speed forward     Second speed forward     Third speed forward     Fourth speed forward     Neutral     First speed reverse     Second speed reverse     Third speed reverse    
Clutch 1     X     X     X                        
Clutch 2                 X                    
Clutch 3                         X     X     X    
Clutch 4         X                     X        
Clutch 5             X     X     X             X    
Clutch 6     X                     X            



Illustration 3g00945677

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. All six clutches are disengaged by a wave spring and a balance seal assembly. 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 a is not engaged the force from the wave spring and the pressure from the lube oil combine in order to move the clutch piston to the clutch disengaged position. This applies to all the clutches.

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) and clutch 2 (6). Shaft assembly (19) contains clutch 3 (23) and clutch 4 (17). Shaft assembly (27) contains clutch 5 (30) and clutch 6 (28) .

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




Illustration 4g00929519

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train ECM. Some of the inputs that are considered are machine speed, engine speed, and operator inputs.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the FIRST SPEED FORWARD position, both the solenoid on the modulating valve for clutch 6 (52) and the solenoid on the modulating valve for clutch 1 (47) are energized. When the solenoid on the modulating valve for clutch 1 (47) is energized, modulating valve (47) directs pump oil (41) to clutch 1 (4) in order to engage the clutch. When the solenoid on the modulating valve for clutch 6 (52) is energized, the modulating valve directs pump oil (41) to clutch 6 (28) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 5g00945975

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




Illustration 6g00929521

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train ECM. Some of the inputs that are considered are machine speed, engine speed, and operator inputs.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the SECOND SPEED FORWARD position, both the solenoid on the modulating valve for clutch 4 (50) and the solenoid on the modulating valve for clutch 1 (47) are energized. When the solenoid on the modulating valve for clutch 1 (47) is energized, the modulating valve directs pump oil (24) to clutch 1 (4) in order to engage the clutch. When the solenoid on the modulating valve for clutch 4 (50) is energized, the modulating valve directs pump oil (41) to clutch 4 (17) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 7g00946049

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




Illustration 8g00929523

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train ECM. Some of the inputs that are considered are machine speed, engine speed, and operator inputs.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the THIRD SPEED FORWARD position, both the solenoid on the modulating valve for clutch 5 (51) and the solenoid on the modulating valve for clutch 1 (47) are energized. When the solenoid on the modulating valve for clutch 1 (47) is energized, the modulating valve directs pump oil (41) to clutch 1 (4) in order to engage the clutch. When the solenoid on the modulating valve for clutch 5 (51) is energized, the modulating valve directs pump oil (41) to clutch 5 (30) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (41) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 9g00946067

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




Illustration 10g00929525

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train ECM. Some of the inputs that are considered are machine speed, engine speed, and operator inputs.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the FOURTH SPEED FORWARD position, the solenoid on the modulating valve for clutch 5 (51) is energized and the solenoid on the modulating valve for clutch 2 (54) is energized. When the solenoid on the modulating valve for clutch 2 (54) is energized, the modulating valve directs pump oil (41) to clutch 2 (6) in order to engage the clutch. When the solenoid on the modulating valve for clutch 5 (51) is energized, the modulating valve directs the pump oil (51) to clutch 5 (30) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 11g00946085

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




Illustration 12g00929526

When the power train ECM determines that the transmission should be in NEUTRAL, clutch 5 is engaged. If the power train ECM detects machine movement, the power train ECM will disengage clutch 5.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the NEUTRAL position or the transmission neutralizer is activated, the solenoid on the modulating valve for clutch 5 (51) is energized. When the solenoid on the modulating valve for clutch 5 (51) is energized, the modulating valve directs the pump oil (51) to clutch 5 (30) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 13g00946097

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




Illustration 14g00929527

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train ECM. Some of the inputs that are considered are machine speed, engine speed, and operator inputs.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the FIRST SPEED REVERSE position, both the solenoid on the modulating valve for clutch 6 (52) and the solenoid on the modulating valve for clutch 3 (53) are energized. When the solenoid on the modulating valve for clutch 3 (53) is energized, the modulating valve directs pump oil (41) to clutch 3 (23) in order to engage the clutch. When the solenoid on the modulating valve for clutch 6 (52) is energized, the modulating valve directs pump oil (41) to clutch 6 (28) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (22) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 15g00946113

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). Gear (1) 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




Illustration 16g00929528

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train ECM. Some of the inputs that are considered are machine speed, engine speed, and operator inputs.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the SECOND SPEED REVERSE position, both the solenoid on the modulating valve for clutch 4 (50) and the solenoid on the modulating valve for clutch 3 (54) are energized. When the solenoid on the modulating valve for clutch 3 (54) is energized, the modulating valve directs pump oil (41) to clutch 3 (23) in order to engage the clutch. When the solenoid on the modulating valve for clutch 4 (50) is energized, the modulating valve directs pump oil (41) to clutch 4 (17) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 17g00946279

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). Gear (1) 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




Illustration 18g00929529

The power train ECM (44) determines the proper clutches that need to be engaged. The proper clutch engagement is based on the inputs to the power train ECM. Some of the inputs that are considered are machine speed, engine speed, and operator inputs.

The power train electronic control module (ECM) modulates the electrical current that is sent to the selected clutch solenoids. The clutch solenoids are located on the modulating relief valves. Modulating the current to the clutch solenoid controls the clutch pressure by shifting the spool in the modulating valve.

When the transmission direction and speed control lever is moved to the THIRD SPEED REVERSE position, both the solenoid on the modulating valve for clutch 5 (51) and the solenoid on the modulating valve for clutch 3 (54) are energized. When the solenoid on the modulating valve for clutch 3 (54) is energized, the modulating valve directs pump oil (41) to clutch 3 (23) in order to engage the clutch. When the solenoid on the modulating valve for clutch 5 (51) is energized, the modulating valve directs pump oil (41) to clutch 5 (30) in order to engage the clutch.

The oil in the clutches that are not engaged is sent back to sump (56) and the oil becomes return oil (59) .

The transmission main relief valve (45) controls the pressure of the pump oil (41) that is supplied to the modulating valves. The transmission main 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 (48) to oil cooler (49) as lubrication oil (43). After the oil cools, the oil flows to the transmission for transmission lubrication. After the transmission is lubricated and cooled, the oil drains to the sump (56) .

Torque converter inlet relief valve (55) limits the torque converter inlet oil pressure in order to protect the torque converter.




Illustration 19g00946312

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). Gear (1) 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) .

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