2009/06/29 Correction to Specifications , "Service and Parking Brake" {4251, 4267} Caterpillar

Underground Articulated Truck:

AD30 (S/N: CXR1-UP; DXR1-UP)

Specifications, RENR6914, "AD30 Underground Articulated Truck Braking System", "Service and Parking Brake". This module is part of Service Manual, RENR4778 Volume II.Specifications, RENR6914, "AD30 Underground Articulated Truck Braking System", "Service and Parking Brake". This module is part of Service Manual, RENR8521 Volume II.

The information in the above module has changed. Replace the information with the following information.

Service and Parking Brake

Illustration 1	g00911360

(1) Torque for the 32 bolts ... 120 ± 20 N·m (90 ± 15 lb ft)

(2) Torque for the 4 bolts ... 120 ± 20 N·m (90 ± 15 lb ft)

(3) 9D-6135 Spring (inner)

Quantity ... 13

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 (4.546 inch)

Outside diameter ... 26.59 mm (1.047 inch)

(4) 9D-6093 Spring (outer)

Quantity ... 13

Length under test force ... 90.50 mm (3.563 inch)

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

Free length after test ... 116.50 mm (4.586 inch)

Outside diameter ... 46.02 mm (1.812 inch)

(5) 8W-9707 Damper

Thickness of one new damper ... 6.86 ± 0.25 mm (0.27 ± 0.0098 inch)

Note: Install the damper with the facing material away from the plates and discs.

(6) 9V-6164 Outer Plate

Thickness of one new plate ... 2.413 ± 0.064 mm (0.0950 ± 0.0025 inch)

Minimum permissible wear thickness ... 2.16 mm (0.085 inch)

(7) 9W-7020 Friction Disc

Thickness of one new friction disc ... 5.08 ± 0.13 mm (0.200 ± 0.005 inch)

Minimum permissible wear thickness ... 4.70 mm (0.185 inch)

Note: Lubricate the friction discs at assembly with the oil being sealed.

(8) Torque for the 4 studs ... 65 ± 10 N·m (48 ± 7 lb ft)

(9) Torque for the 4 nuts ... 100 ± 20 N·m (75 ± 15 lb ft)

Note: Torque each nut (9) 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 criss cross pattern.

(10) 9J-5491 Spring

Quantity ... 4

Length under test force ... 49 mm (1.93 inch)

Test force ... 358 ± 17.8 N (80.5 ± 4.02 lb)

Free length ... 74.7 mm (2.94 inch)

Outside diameter ... 24.94 mm (0.982 inch)

(11) Thickness of 11 new friction discs, 11 new plates and one new damper assembly ... 98.283 ± 2.384 mm (3.8694 ± 0.0939 inch)