120H and 135H Motor Graders Air System and Brakes Parking Brake Caterpillar


Parking Brake
`
120H and 135H Motor Graders Air System and Brakes [RENR4163]
BRAKING SYSTEM
BRAKE GP
120H and 135H Motor Graders Air System and Brakes Parking Brake



Illustration 1g01715615

(1) Thickness of five new friction discs and six new plates for the parking brake group is 43.705 ± 1.305 mm (1.7207 ± 0.0514 inch).

Thickness of one new 6Y-5352 Friction Disc ... 4.82 to 5.03 mm (0.190 to 0.198 inch)
Minimum thickness of one worn 6Y-5352 Friction Disc ... 4.45 mm (0.175 inch)
Thickness of one new 7G-0437 Plate ... 3.18 ± 0.13 mm (0.125 ± 0.005 inch)

(2) Lubricate the bore of the O-ring seal lightly with the lubricant that is being sealed.

(3) Lubricate the bore of the seal lightly with the lubricant that is being sealed.

(4) Lubricate the sealing lip of the lip type seal lightly with the lubricant that is being sealed.

(5) Torque for the bolt ... 120 ± 20 N·m (90 ± 15 lb ft)

(6) Torque for six bolts ... 55 ± 10 N·m (41 ± 7 lb ft)

(7) Torque for 12 bolts ... 100 ± 20 N·m (75 ± 15 lb ft)

(8) 9W-4431 Spring

Quantity ... 20
Length under test force ... 49 mm (1.9 inch)
Test force ... 139.5 ± 11.2 N (31.4 ± 2.5 lb)
Free length after test ... 64.3 mm (2.53 inch)
Outside diameter ... 16.46 mm (0.648 inch)

(9) 9W-4430 Spring

Quantity ... 20
Length under test force ... 49 mm (1.9 inch)
Test force ... 253.7 ± 20.3 N (57.0 ± 4.6 lb)
Free length after test ... 64.3 mm (2.53 inch)
Outside diameter ... 24 mm (0.9 inch)

(10) Torque for the plug assembly ... 12 ± 1 N·m (105 ± 9 lb in)

(11) Lubricate the bore of the seal lightly with the lubricant that is being sealed.

Note: Apply white Loctite Low Breakloose PST to the first three threads of the plug (12) prior to assembly.

(12) Torque for the plug ... 18 ± 3 N·m (160 ± 27 lb in)

(13) Torque for the plug assembly ... 100 ± 10 N·m (75 ± 7 lb ft)

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