793C and 793C XQ Off-Highway Truck Power Train Caterpillar

Illustration 1	g00294536

(A) Dimension from the face of the sun gear to the machined face of the outer carrier ... 29 ± 2 mm (1.14 ± 0.08 inch)

(1) Torque for the eight bolts that are on the shafts of the inner carrier ... 135 ± 15 N·m (100 ± 11 lb ft)

Note: Apply 9S-3263 Thread Lock Compound to the threads of the bolts after the bearing adjustment has been made.

Note: Perform "Procedure To Install The First Reduction Planetary Components" before you install these bolts.

(2) 7I-5540 Shaft

Outside diameter of a new shaft ... 77.839 ± 0.012 mm (3.0645 ± 0.0005 inch)

Note: Measure the diameter at the contact point of the roller bearings.

(3) 115-4881 Planetary Gear

Inside diameter of a new gear ... 136.436 ± 0.013 mm (5.3715 ± 0.0005 inch)

Note: Measure the diameter at the contact point of the roller bearings.

(4) Torque for the three bolts ... 100 ± 10 N·m (74 ± 7 lb ft)

(5) 115-4883 Planetary Gear

Inside diameter of a new gear ... 190.411 ± 0.013 mm (7.4965 ± 0.0005 inch)

Note: Measure the diameter at the contact point of the roller bearings.

(6) Torque for the eight bolts that are on the shafts of the outer carrier ... 255 ± 15 N·m (188 ± 11 lb ft)

Note: Apply 9S-3263 Thread Lock Compound to the threads of the bolts after the bearing adjustment has been made.

Note: Perform "Procedure To Install The Second Reduction Planetary Components" before you install these bolts.

(7) 7I-5534 Shaft

Outside diameter of a new shaft ... 101.651 ± 0.012 mm (4.0020 ± 0.0005 inch)

Note: Measure the diameter at the contact point of the roller bearings.

(8) Torque for four bolts ... 60 ± 7 N·m (44 ± 5 lb ft)

(10) 8X-0566 Shim pack

Shim pack thickness ... 1.49 mm (0.059 inch)

Note: See "Procedure To Install The Second Reduction Planetary Components" in order to determine the amount of shims to use.

(11) Retainer plate

(12) Bearing assembly

(13) Snap ring

(14) Bearing assembly

(15) Inner carrier

(16) Torque for 12 bolts ... 100 ± 10 N·m (74 ± 7 lb ft)

Note: Apply 9S-3263 Thread Lock Compound to the threads of the bolts.

(17) Retainer plate

(18) 8W-6910 Shim Pack

Shim pack thickness ... 1.24 mm (0.049 inch)

Note: See "Procedure To Install The First Reduction Planetary Components" in order to determine the amount of shims to use.

(20) Sun gear

(21) Outer carrier

Procedure To Install The First Reduction Planetary Components

Note: The components in the bearing assemblies are matched components. Do not use parts from other bearing assemblies.

1. Assemble bearing assembly (14) and the snap ring into gear (3). Assemble gear (3) into inner carrier (15).

2. Use a press in order to install shaft (2). Make sure that all of the components are aligned and that all bearing components are seated. Gear (3) must be rotated during the pressing of the shaft.

3. Measure the gap that exists between the end of shaft (2) and the carrier deck.

4. The shim pack thickness is the gap that was measured in Step 3. The tolerance is + 0.00 − 0.05 mm (+ 0.000 − 0.002 inch).

5. Install shim pack (18), plates (17) and bolts (1). Torque bolts (1) to 135 ± 15 N·m (100 ± 11 lb ft).

Procedure To Install The Second Reduction Planetary Components

Note: The components in the bearing assemblies are matched components. Do not use parts from other bearing assemblies.

1. Assemble bearing assembly (12), snap rings (13) and the spacers into gear (5). Assemble gear (5) into outer carrier (21).

2. Use a press in order to install shaft (7). Make sure that all of the components are aligned and that all bearing components are seated. Gear (5) must be rotated during the pressing of the shaft.

3. Measure the gap that exists between the end of shaft (7) and the carrier deck.

4. The shim pack thickness is the gap that was measured in Step 3. The tolerance is + 0.00 − 0.05 mm (+ 0.000 − 0.002 inch).

5. Install shim pack (10), plates (11), and bolts (6). Torque bolts (6) to 255 ± 15 N·m (188 ± 11 lb ft).

Assembly Procedure

1. Install the first reduction planetary components.

2. Install sun gear (20). The splines of the sun gear should engage a length that is approximately half of the available length of the spline of inner carrier (15).

3. Install the second reduction planetary components. Align the teeth of the sun gear and teeth of the planetary gears. Push outer carrier (21) into the wheel until the planetary gears contact the outer ring gear. Then, push outer carrier (21) against the wheel.

4. Dimension (A) from the face of the sun gear to the machined face of outer carrier (21) should be 29 ± 2 mm (1.14 ± 0.08 inch). Install the cover.