785G Off-Highway Truck Systems Caterpillar

Service and Parking Brake (Rear)

Usage:

785G RTL

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Illustration 1	g06214352

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Table 1
Item	Qty	Part	Specification Description
1	8	9D-7989 Nut	Torque to 270 ± 25 N·m (200 ± 18 lb ft). Note: Torque each nut by one revolution to pull down the housing. When all the nuts bottom out, tighten the nuts to the specified torque in a crisscross pattern.
2	8	5P-4282 Taperlock Stud	Torque to 100 ± 15 N·m (74 ± 11 lb ft).
3	44	4E-9311 Bolt	Torque to 500 ± 50 N·m (370 ± 37 lb ft).
4	68	139-4774 Taperlock Stud	Torque to 260 ± 40 N·m (192 ± 30 lb ft).

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Illustration 2	g06214354
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Table 2
Item	Qty	Part	Specification Description
1	12	9D-7989 Nut	Torque to 270 ± 25 N·m (200 ± 18 lb ft). Torque each nut by one revolution to pull down the housing. When all the nuts bottom out, tighten the nuts to the specified torque in a crisscross pattern.
5	12	5D-4809 Taperlock Stud	Torque to 100 ± 15 N·m (75 ± 11 lb ft).
6	46	9D-6093 Spring (Outer)	Length under test force is 90.5 mm (3.56 inch).
			Length under test force is 90.5 mm (3.56 inch).
			Test force is 4235 ± 254 N (952 ± 57 lb).
			Free length after test is 116.5 mm (4.59 inch).
			Free length after test is 116.5 mm (4.59 inch).
C	-	-	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).
		226-2826 Friction Disc	Thickness of one new friction disc 5.08 ± 0.08 mm (0.200 ± 0.003 inch).
		8W-0212 Plate	Thickness of one new plate 2.413 ± 0.064 mm (0.0950 ± 0.0025 inch).
		6G-6500 Damper Assembly	Thickness of one new damper assembly 6.86 ± 0.25 mm (0.270 ± 0.010 inch).
		6G-6500 Damper Assembly	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.
7	42	9D-6135 Spring (Inner)	Length under test force is 90.5 mm (3.56 inch).
			Test force is 1535 ± 44 N (345 ± 10 lb).
			Free length after test is 115.49 mm (4.547 inch).
			Free length after test is 115.49 mm (4.547 inch).
8	44	3B-2968 Bolt	Torque to 500 ± 50 N·m (370 ± 37 lb ft).
9	1	9X-7313 O-Ring Seal	Lubricate bore lightly with the lubricant that is being sealed.

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Illustration 3	g06214356
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Table 3
Item	Qty	Part	Specification Description
10	4	9D-9121 Spring	Length under test force is 74.90 mm (2.949 inch).
			Test force is 890 ± 27 N (200 ± 6 lb).
			Free length after test is 91.14 mm (3.588 inch).