797F and 797F XQ Off-Highway Truck Power Train Caterpillar

Illustration 1	g01949763

Illustration 2	g01949766
Section A-A

Refer to Disassembly and Assembly, "Final Drive, Brake and Wheel (Rear)" for the assembly for the rim adapter and refer to Tool Operating Manual, NEHS0872, "Preload Procedure" for bearing preload.

(1) Torque for the nuts ... 3100 ± 350 N·m (2286 ± 258 lb ft)

(2) Lubricate the seal assembly lightly with the lubricant that is being sealed. Ensure that the seal assembly is snapped into the groove. Keep the brake hub (3) centered on the seal retainer (5) in order to prevent the damage of the seal assembly on holes of the brake hub during assembly.

(4) Lubricate two O-ring seals lightly with the lubricant that is being sealed.

(6) Apply 154-9731 Thread Lock Compound to the threads of the bolts.

(7) Apply 4C-5592 Anti-Seize Compound to the serrated length of the shank of the stud before pressing into the wheel (8).

(9) Install the seal retainer so that one of the cast hole in the seal retainer is in line with the tube of spindle oil.

(10) Use the following procedure to tighten the 21 bolts:

1. Install one half of the total bolts so that the bolts are equally spaced. Tighten the bolts in the alternate sequence to 450 ± 50 N·m (332 ± 37 lb ft).

2. Install the remaining bolts and tighten to 800 ± 100 N·m (590 ± 74 lb ft). Turn the bolts to an additional angle of 90 ± 10 degrees.

3. Tighten the bolts that were installed in step 1 to 800 ± 100 N·m (590 ± 74 lb ft). Turn the bolts to an additional angle of 90 ± 10 degrees.

Note: Do not use the bolts which are removed after the above setting procedure. Discard the bolts and replace the bolts with new bolts.

(11) As required, use the following shim pack in order to fill the gap between the reaction hub and the spindle assembly which allows correct preload on the bearings and a good bolted joint:

139-7624 Shim Pack

Thickness of the shim pack ... 3.90 mm (0.154 inch)

(12) Torque for the bolts ... 3100 ± 350 N·m (2286 ± 258 lb ft)

Illustration 3	g01961040
Detail B Service and parking brake group

(13) Torque for the taperlock studs ... 1200 ± 150 N·m (885 ± 111 lb ft)

Note: Torque each nut (14) in one revolution at a time in order to pull down the housing evenly. When all of the nuts bottom out, tighten the nuts to the specified torque in a crisscross pattern.

(14) Torque for the nuts ... 300 ± 40 N·m (221 ± 30 lb ft)

(15) 9D-9121 Spring

Length under test force ... 74.9 mm (2.95 inch)

Test force ... 890 ± 27 N (200 ± 6 lb)

Free length after test ... 91.14 mm (3.588 inch)

Outside diameter ... 26.59 mm (1.047 inch)

(16) Torque each nut in one revolution at a time in order to pull down the housing evenly. When all of the nuts bottom out, tighten the nuts to the specified torque in a crisscross pattern.

(17) Torque for the taperlock studs ... 110 ± 20 N·m (81 ± 15 lb ft)

(18) 9D-6135 Spring

Length under test force ... 90.5 mm (3.56 inch)

Test force ... 1535 ± 44 N (345 ± 10 lb)

Free length after test ... 115.49 mm (4.547 inch)

Outside diameter ... 26.59 mm (1.047 inch)

(19) 9D-6093 Spring

Length under test force ... 90.5 mm (3.56 inch)

Test force ... 4235 ± 254 N (952 ± 57 lb)

Free length after test ... 116.5 mm (4.59 inch)

Outside diameter ... 46.024 ± 0.410 mm (1.8120 ± 0.016 inch)