621K, 623K, and 627K Wheel Tractor-Scrapers Systems Caterpillar


Service and Parking Brake

Usage:

621K WTA


Illustration 1g03453496
Front view

Table 1
Specification for 419-8251 Service and Parking Brake Gp 
Item  Qty  Part  Specification Description 
6E-1299 Spring  Length under test force is 70.0 mm (2.76 inch)
Test force is 374 ± 30 N (84 ± 7 lb).
Free length after test is 85.4 mm (3.36 inch).
247-8269 Damper  Thickness is 6.86 ± 0.24 mm (0.270 ± 0.009 inch)
366-2523 Outer Plate  Thickness of one new outer plate is 3.695 ± 0.065 mm (0.1455 ± 0.0026 inch)
Minimum permissible wear thickness is 3.44 mm (0.135 inch)
8E-2183 Friction Disc  Lubricate the friction disc at assembly using the liquid being sealed.
Thickness of one new friction disc 5.08 ± 0.13 mm (0.200 ± 0.005 inch).
The minimum reusable thickness for one disc is 4.572 mm (0.1800 inch)


Illustration 2g03453497
Rear view

Table 2
Item  Qty  Part  Specification Description 
244-2306 Nut  Torque nut to 100 ± 20 N·m (74 ± 15 lb ft)
246-5451 Taperlock Stud  Torque stud to 65 ± 10 N·m (48 ± 7 lb ft)

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