777F Off-Highway Truck Hydraulic System Caterpillar

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(1) 261-2355 Service and Parking Brake Gp

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Section A-A

(2) Assembled brake pack

Thickness of 15 new discs, 14 new plates, and two new damper assemblies ... 123.70 ± 2.60 mm (4.870 ± 0.102 inch)

Thickness of one new 226-2826 Friction Disc ... 5.08 ± 0.08 mm (0.200 ± 0.003 inch)

Thickness of one new 8W-0212 Plate ... 2.413 ± 0.064 mm (0.0950 ± 0.0025 inch)

Thickness of one new 6G-6500 Damper Assembly ... 6.86 ± 0.25 mm (0.270 ± 0.010 inch)

Note: Install the damper assembly so that the facing material faces toward the plate and the piston.

Note: At assembly, lubricate the friction discs with the oil that is used in the brakes. See the Operation and Maintenance Manual, "Lubricant Viscosities"
for that information.

(3) 9D-6135 Spring (inner)

Quantity ... 32

Test length ... 90.50 mm (3.56 inch)

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

Free length after test ... 115.49 mm (4.55 inch)

Outside diameter ... 26.59 mm (1.05 inch)

(4) 9D-6093 Spring (outer)

Quantity ... 36

Test length ... 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 ... 46.02 mm (1.81 inch)

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Section B-B

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Section C-C

(5) 9D-9121 Spring (return)

Quantity ... 4

Test length ... 74.90 mm (2.95 inch)

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

Free length after test ... 91.13 mm (3.59 inch)

Outside diameter ... 26.59 mm (1.05 inch)

(6) 9D-9118 Spring Guide

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(7) Torque for nine nuts ... 100 ± 20 N·m (74 ± 15 lb ft)

(8) Torque for five studs ... 110 ± 20 N·m (80 ± 15 lb ft)

Note: Apply 4C-4030 Compound to the threads of studs (8).

(9) Torque for five nuts ... 270 ± 40 N·m (200 ± 30 lb ft)

Note: Apply 4C-4030 Compound to the threads of nuts (9).

(10) Torque for the six bolts ... 270 ± 40 N·m (200 ± 30 lb ft)