784C and 785C Off-Highway Truck/Tractors Air System and Brakes Caterpillar

Illustration 1	g00291264

(1) Torque for eight studs ... 100 ± 15 N·m (75 ± 11 lb ft)

(2) Torque for eight nuts ... 270 ± 25 N·m (200 ± 18 lb ft)

Note: Torque each nut (2) by one revolution to evenly pull down the housing. When all the nuts bottom out, tighten the nuts to the specified torque in the letter sequence that is shown.

(3) Torque for 44 bolts ... 500 ± 50 N·m (370 ± 37 lb ft)

(4) Torque for 68 studs ... 260 ± 40 N·m (192 ± 30 lb ft)

(5) Torque for 68 nuts ... 880 ± 80 N·m (649 ± 59 lb ft)

Illustration 2	g00291285
View A-A

Illustration 3	g00291286
View B-B

Note: Rubber toric seals and all the surfaces in contact with the rubber toric seals must be clean and dry at assembly. Prior to installation, put a thin layer of oil on the surfaces of the metal seals that are in contact. Put lubricant on all other seals at assembly.

(6) Torque for eight studs ... 100 ± 15 N·m (75 ± 11 lb ft)

(7) Torque for eight nuts ... 270 ± 25 N·m (200 ± 18 lb ft)

Note: Torque each nut (7) by one revolution to evenly pull down the housing. When all the nuts bottom out, tighten the nuts to the specified torque in a crisscross pattern.

(8) Assembled brake pack

Thickness of ten new discs, nine new plates, and two new damper assemblies ... 86.24 ± 1.88 mm (3.395 ± 0.074 inch)

Thickness of one new 198-1137 Friction Disc ... 5.08 ± 0.08 mm (0.200 ± 0.003 inch)

Thickness of one new 198-1450 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.

(9) 9D-6093 Spring (outer)

Quantity ... 46

Color code ... yellow stripe

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 (1.812 inch)

(10) 9D-6135 Spring (inner)

Quantity ... 42

Test length ... 90.50 mm (3.563 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)

(11) Torque for 44 bolts ... 500 ± 50 N·m (370 ± 37 lb ft)

(12) 9D-9121 Spring (return)

Quantity ... 4

Test length ... 74.90 mm (2.949 inch)

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

Free length after test ... 91.13 mm (3.588 inch)

Outside diameter ... 26.59 mm (1.047 inch)