GEAR-SUN 8M8623 - Caterpillar

Transmission Clutches and Shafts
Illustration 1 g02731178
Five Transmission Shafts (1) Transfer gear shaft (2) Planetary carrier (3) Output shaft (4) Intermediate shaft (5) Gear (6) Gear (8) Input shaft (9) Gear (11) Gear (12) Gear (13) Gear (14) Gear (15) Gear (16) Gear (17) Gear (18) Gear (19) Gear (20) Gear (21) Planetary Carrier (22) Clutch housingNote: Gear (5) never meshes with gear (10). The configuration of the five transmission shafts in Illustration 1 is only for illustrative purposes.The transmission contains the following transmission shafts:
Input shaft (1)
Reverse shaft (2)
Intermediate shaft (3)
Output shaft (4)
Transfer gear shaft (21) Input Shaft
Illustration 2 g02685377
Input Shaft (8) Input shaft (9) Gear (10) Gear (11) Gear (12) Gear (13) GearWhen clutch pack (C) or clutch pack (D) are engaged, gears (9) and (12) are locked to input shaft (8). Otherwise, the gears are free to rotate.Gears (10), (11), and (13) are permanently splined to the input shaft. These gears always rotate with the input shaft.ReferenceSee Systems Operation/Testing and Adjusting, "Transmission Clutches" for additional information.Reverse Shaft
Illustration 3 g02685396
Reverse Shaft (6) Gear (7) Reverse shaft (16) GearWhen clutch pack (A) is engaged, gear (6) is locked to reverse shaft (7). Otherwise, the gear is free to rotate.Gear (16) is permanently splined to reverse shaft (7) .ReferenceSee Systems Operation/Testing and Adjusting, "Transmission Clutches" for additional information.Intermediate Shaft
Illustration 4 g02685417
Intermediate Shaft (4) Intermediate shaft (5) Gear (14) Gear (15) Gear (17) Gear (18) GearWhen clutch pack (E) is engaged, gear (15) is locked to intermediate shaft (4). Otherwise, the gear is free to rotate.When clutch pack (F) is engaged, gear (17) is locked to the intermediate shaft. Otherwise, the gear is free to rotate.Gears (5), (14), and (18) are permanently splined to the intermediate shaft. The gears always rotate with the intermediate shaft.ReferenceSee Systems Operation/Testing and Adjusting, "Transmission Clutches" for additional information.Output Shaft
Illustration 5 g02685437
Output Shaft (4) Output shaft (17) Planetary carrier (18) Gear (19) Planetary carrier (20) GearNote: The planetary clutches are not shown in Illustration 5. These clutches are located in the front and rear transmission cases.When planetary clutch pack (G) is engaged, planetary carrier (2) will turn output shaft (3). Gear (19) turns the sun gear in the planetary carrier.When planetary clutch pack (B) is engaged, planetary carrier (21) will turn the output shaft. Gear (20) turns the sun gear in the planetary carrier.When clutch pack (H) is engaged, gear (19) is locked to the output shaft. Otherwise, the gear is free to rotate.When clutch pack (J) is engaged, gear (20) is locked to the output shaft. Otherwise, the gear is free to rotate.ReferenceSee Systems Operation/Testing and Adjusting, "Transmission Clutches" for additional information.Transmission Clutch Engagement
Illustration 6 g02731192
Transmission Clutch AssignmentsEach modulating valve has a designated letter, as shown. The letters have been cast into the transmission housing.Each modulating valve controls an individual clutch. Each letter is assigned to a corresponding modulating valve. See Illustration 6.These letters are used in Table 1 to show the clutches that are engaged for each gear.No more than two clutches are ever engaged at a time. Also, no