CLAMP-BENT BOLT 3791670 - Caterpillar

Illustration 1 g01990134
Wheel brake components
(1) Brake Anchor
(2) Duo-Cone seals
(3) Front wheel
(4) Front axle assembly
Illustration 2 g01990153
Typical view of the front right service and parking brake
(A) Pressure tap for purging the service brakes and retarder
(B) Oil passage for the parking and secondary brakes
(C) Inlet passage for brake cooling oil
(D) Oil passage for the service brake and retarder
(E) Outlet passage for brake cooling oil
Illustration 3 g01990317
View A-A
(A) Pressure tap for purging the service brakes and retarder
(1) Brake Anchor
(5) Housing
(6) Oil chamber for the service brake and retarder
(7) Piston for the service brake and retarder
(8) Discs
(9) Plates
(10) Spring for the parking and secondary brakes
(11) Spring for the parking and secondary brakes
(12) Piston for the parking and secondary brakes
(13) Oil chamber for the oil that releases the parking and secondary brakes
Illustration 4 g01990355
Section B-B
(14) Spring Guide
(15) Spring for the service brake and retarder Front wheel (3) is connected to housing (5). Two taper roller bearings support this connection. Housing (5) does not turn. Plates (9) do not turn. Discs (8) turn with front wheel (3).Brake cooling oil flows into oil passage (C) and the brake cooling oil cools discs (8) and plates (9). Then, the brake cooling oil flows through outlet passage (E). The brake cooling oil returns to the hydraulic tank.Use pressure tap (A) to remove air from the hydraulic system for the service brakes. Use the plug in oil passage (B) to remove air from the hydraulic system for the parking brakes.Parking Brake Application
The parking brakes are applied by springs and released by oil pressure. When the parking brakes are engaged, pump pressure is not sent to oil passage (B). Oil pressure is not sent to oil chamber (13). Springs (11) push on piston (12). Piston (12) pushes piston (7). Piston (7) pushes discs (8) and plates (9) together. When discs (8) and plates (9) are held together, friction occurs. The friction prevents wheel assembly (3) from rotating.When the parking brakes are released, pump pressure is sent to oil passage (B). Then, oil flows into oil chamber (13). The pressure oil forces piston (12) to compress springs (11). Spring (15) and spring guide (14) pull piston (7) away from discs (8) and from plates (9). Discs (8) and plates (9) will not be in contact and the parking and secondary brakes will be released.Service Brake Application
When the service brake or the retarder is applied, oil pressure flows to oil passage (D). Then, oil flows into oil chamber (6). As the oil pressure increases, piston (7) pushes discs (8) and plates (9) together and friction occurs. The friction causes the rotation of front wheel (3) to slow. A continued application of the service brake or the retarder stops the rotation of front wheel (3).When the service brakes are released, oil pressure does not flow into oil passage (D) or oil chamber (6). Spring (15) and spring guide (14) pull piston (7) away from discs (8) and from plates (9). Discs (8) and plates (9) will not be in contact and the service brakes will be released.