Daewoo Solar 300LC-V, Manual

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S0707270K
Page 4 Swing Motor (Toshiba MFC200)
GENERAL DESCRIPTION
THEORY OF OPERATION
The swing drive motor is an axial piston motor (MFC200). The motor also contains the following
components;
1. Mechanical brake
2. Make-up valve
3. Ultra shockless valve
4. Time relay valve
5. Bypass valve
Hydraulic Motor
The rotary group consist of a cylinder block (27) which is a single body design with an integral drive shaft.
Nine piston assemblies (9) are housed in the cylinder block (27). Both ends of the cylinder block (27) are
supported by bearings (4 and 25).
Piston assembly (9) is guided by return plate (8) and backing spring (6) to slide on cam plate (7). The
strength of scrowave (18) and the hydraulic power which actuates bushing (16), cause the mating surfaces
of balance plate (24) and cylinder block (27) to be pressed together.
Mechanical brake plates (10 and 11) used for braking are installed between the outer surface of cylinder
block (27) and housing (28). Lining plates (10) are splined to the cylinder block. Plates (11) are splined to
the housing. The brake plates are forced together by piston (13) and eighteen springs (15). This
configuration results in the brake being "spring applied" and "hydraulically released."
Installed in the motor cover (19) are the following items;
• Relief valve (45) for cushioning function.
• Make-up valves (36, 37 and 38) for cavitation elimination.
• Bypass valve (30) for the elimination of vibration when stopping.