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| Illustration 1 | g00794547 |
Travel motor (1) Cover (2) Spring (3) Brake piston (4) Friction plate (5) Guide (6) Retainer plate (7) Slipper (8) Piston (9) Spring (10) Valve plate (11) Passage (12) Passage (13) Passage (14) Orifice (15) Barrel (16) Piston (17) Swashplate (18) Retainer holder (19) Shaft (20) Pilot port (automatic travel speed change) (21) Drain port (22) Port (23) Port (24) Plug (25) Spring (26) Spool (27) Plug (28) Displacement change valve (29) Piston | |
The travel motor can be divided into the following three groups:
- The rotary group consists of the following components: barrel (15), shaft (19), piston (16), slipper (7), retainer plate (6), retainer holder (18) and guide (5) .
- The parking brake group consists of the following components: spring (2), brake piston (3), orifice (14) and friction plate (4) .
- The displacement change group consists of the following components: spring (9), piston (8), piston (29) and displacement change valve (28) .
The flow of the pump oil depends on the direction of travel. Pump oil flows into the travel motor through either port (22) or port (23). Pump oil is forced out of the travel motor through port (23) or (22). The case drain oil that has leaked from the sliding surfaces and clearances returns to the hydraulic tank through drain port (21) .
Supply oil from the left pump flows into the left travel motor through port (23) during forward travel. The oil from port (23) flows through passage (11) in cover (1), and the oil reaches passage (12) in valve plate (10). The oil then flows through passage (13) in barrel (15). The oil forces piston (16) to the left.
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| Illustration 2 | g00794591 |
Oil passages (side view of motor from cover) (12) Passage (valve plate) (13) Passage (barrel) | |
Slipper (7) is coupled to piston (16). The slipper and the piston slide on the surface of swashplate (17) from the top center to the bottom center. The slipper and the piston rotate with barrel (15). Oil from the piston is discharged through port (23) via passages (13) and (12) of valve plate (10). Shaft (19) is splined to barrel (15). The barrel and the shaft rotate counterclockwise. The force of the rotation is transferred to the left travel drive, and the machine moves forward.
In reverse travel, oil is supplied through port (22), and port (23) becomes the discharge port. The left travel motor rotates clockwise, and the machine moves backward.