HOSE A 1074570 - Caterpillar

2-3 Operation
(1) Motor 1. There are two ports symmetrically located on motor cover (2) and port plate (12). If oil is injected from the left port, then it is ejected from the right port. 2. Pressurized oil enters left port of motor cover (2) and passes by the port plate (12). Then it passes by valve plate (11) and drum seal (8) as shown by arrow F in the above diagram and acts on points A, B, C and D of the piston shoe assembly shown in the left figure. 3. The pressurized oil F pushes piston shoe assembly (48) against the sloping surface of cam plate (3) to produce a force F2 that rotates drum assembly (6). 4. Force F2 causes piston shoe assembly (48) to drop while expanding its volume.5. Since piston shoe assembly (48) is inserted into drum assembly (6), it moves together with drum assembly (6) in an arc as it drops along the sloping surface.6. Since drum assembly (6) is coupled via splines to shaft (4), shaft (4) rotates in the arrow direction. 7. As drum assembly (6) rotates, the next piston shoe assembly H rotates to the left side of port plate (12). When this piston shoe assembly H comes to the port on the left side, it receives oil pressure and rotates drum assembly (6) just as piston shoe assembly (48) A,C,B and D. 8. When piston shoe assembly (48) has dropped all the way down the sloping surface as D in the left figure and no longer receives oil pressure from the port, it no longer acts on drum assembly (6).9. Piston shoe assembly (48) D is pushed back up the sloping surface by the rotation of drum assembly (6) driven by other piston shoe assemblies (48) which are still acted on by oil pressure. At this time the volume of piston shoe assembly (48) D contracts and oil is forced out from the right port to the hydraulic tank.10. As long as oil continues to flow, this action continues to rotate shaft (4).11. If oil is injected in the opposite direction, from the right side port of motor cover (2) to port plate (12), the same action as described above causes shaft (4) to turn in the opposite direction.12. Thus, the direction of rotation of shaft (4) is determined by oil injection side of motor cover (2). The rotation speed is determined by the amount of oil injected.(2) Parking brake * When brake operates 1. When pressurized oil P is not injected into the brake release port, steel plate (20) is pushed against friction plate (19) through brake piston (18) by force W.2. Friction plate (19) is coupled to shaft (4) through drum assembly (6), so even if an external force is applied to shaft (4), friction resistance of friction plate (19) regulates shaft (4) rotation. 3. When pressurized oil P is injected into the brake release port, it acts on brake piston (18) which in turn opposes the