TA19-M2WD and TA19-M4WD Agricultural Transmissions Caterpillar

Transmission Clutches and Shafts

Illustration 1	g01328922
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

Note: 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	g01336138
Input Shaft (8) Input shaft (9) Gear (10) Gear (11) Gear (12) Gear (13) Gear

When 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	g01336147
Reverse Shaft (6) Gear (7) Reverse shaft (16) Gear

When 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	g01336151
Intermediate Shaft (4) Intermediate shaft (5) Gear (14) Gear (15) Gear (17) Gear (18) Gear

When 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	g01336337
Output Shaft (4) Output shaft (17) Planetary carrier (18) Gear (19) Planetary carrier (20) Gear

Note: 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	g01325833
Transmission Clutch Assignments

Each 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 more than one clutch is ever engaged at one time on any shaft.

Note: The tractor speeds in Table 1 are at 2100 engine rpm.

Power Flow for Reverse Gears

See "Transmission Clutches and Shafts" for additional information about the gears and clutches on the transmission shafts.

Refer to Table 1 for the clutches that are engaged for each transmission gear.

Illustration 7	g01322691
Transmission Shafts for Reverse Gears (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

Note: Gear (9) never meshes with gear (6). The configuration of the four transmission shafts in Illustration 7 is only for illustrative purposes.

Power flow for reverse gears only involves the clutches on the following shafts:

• Reverse shaft (7)

• Output shaft (3)

No more than two clutches are ever engaged at a time. Also, no more than one clutch is ever engaged at one time on any shaft.

For the reverse gears, input shaft (8) is used only to transfer power flow through gear (13). For reverse gears, intermediate shaft (4) is used only to transfer power flow through gears (5), (15), and (16). These gears are permanently splined to the shafts. The gears will always rotate with the shaft.

Power Flow for Forward Gears

See "Transmission Clutches and Shafts" for additional information about the gears and clutches on the transmission shafts.

Refer to Table 1 for the clutches that are engaged for each transmission gear.

Illustration 8	g01322712
Transmission Shafts for Forward Gears (1) Transfer gear shaft (2) Planetary carrier (3) Output shaft (4) Intermediate shaft (5) Gear (8) Input shaft (9) Gear (11) Gear (12) Gear (13) Gear (14) Gear (15) Gear (16) Gear (19) Gear (20) Gear (21) Planetary Carrier

The power flow for forward gears only involves the clutches on the following shafts:

• Input shaft (8)

• Intermediate shaft (4)

• Output shaft (3)

No more than two clutches are ever engaged at a time. Also, no more than one clutch is ever engaged at one time on any shaft.

Gear (13) is not used to obtain any of the forward gears.