BUSHING 4F1496 - Caterpillar

Differential Lock Valve 1. Lever2. Cam3. Spring4. Valve5. Spring6. Inlet Port7. Exhaust Seat8. Inlet Seat9. Outlet Port10. Plunger11. Exhaust OutletWhen the valve is in the disengaged position the cam (2) on the bottom of the lever (1) depresses plunger (10). The plunger moves downward closing exhaust seat (7) against valve (4) and lifting the valve from the inlet seat (8). Air then passes through inlet port (6) to outlet port (9) and on to the differential actuating cylinder.When the lever (1) is moved to the engaged position, spring (3) moves plunger (10) upward. This opens exhaust seat (7) and allows spring (5) to move valve (4) upward against the inlet seat, thus closing off the air supply. Air already in the actuating cylinder flows past exhaust seat (7) to atmosphere through outlet (11).Differential Lock Cylinder
1. Breather2. Piston3. Inlet Port4. RodWhen the "disengaged" position is selected air enters the cylinder through inlet port (3). Piston (2) and rod (4) move down. The rod (4) is attached to the dog clutch selector shaft. The dog clutch is then disgengaged and the inter-axle differential operates normally.When the "engaged" position is selected port (3) is connected to exhaust. Springs fitted to the dog clutch selector shaft then pull rod (4) and piston (2) up. The dog clutch is then engaged and the inter-axle differential is locked.Wheel Brakes
The wheel brakes are air operated drum type brakes. The brake drum (5) is fastened to the wheel assembly. When the brake pedal is pressed air under pressure is directed to the spring brake actuators. The actuator push rods operate the brake cylinders (9) which in turn operate the brake shoes (6) which pivot about pins (4) and are forced into contact with the drum.The brake actuator push rod (11) acts against follower (21) and piston (12). As the piston moves downward it pushes rollers (15) downward which bear against the tapered edges of plungers (19). The plungers then force the adjusting screws (8) out of the cylinder which force the brake shoe assemblies (6) into contact with the drum.
Brake Assembly 1. Cylinder2. Spring3. Spider4. Pivot Pin5. Brake Drum6. Brake Shoe Assembly
Brake Assembly 2. Spring3. Spider4. Pivot Pin6. Brake Shoe Assembly7. Brake Lining8. Adjusting Screws9. Brake Cylinder
Brake Cylinder Assembly 1. Cylinder8. Adjusting Screw10. Brake Actuator11. Pushrod12. Piston13. Seal14. Plug15. Rollers16. Springs17. Pawls18. Actuators19. Plungers20. Spring21. FollowerWhen the brake is released spring (20) forces piston (12) and rollers (15) upward again. At the same time spring (2) pulls the brake shoes away from the drum and forces the adjusting screws (8) and plungers (19) back into the cylinders.Adjusting screws (8) are threaded into actuators (18) which are a free fit in plungers (19). Plugs (14), springs (16) and pawls (17) act as guide assemblies for the plungers (19). The ends of the pawls are toothed and engaged with helical teeth on the outside diameter of actuators (18). As the actuators move out of the slave cylinder during a brake application the helical teeth on the actuators lift