KYB MSF-340VP-EH6 Hydraulic Travel Motor PC850-8 PC850 Excavator Parts.

Motor unit ■ Traveling motor (with reduction gear) ■ Swing motor (with reduction gear) [Construction and Mechanism] 1. When high-pressure oil supplied from the pump flows into the cylinder block through the valve plate, the swash plate is pushed by the force of the piston assembly. 2. The piston assembly receives reaction force against it and produces reaction force in the rotating direction. The total force of high-pressure side piston assembly produces a rotating force in the cylinder block, and the torque is transmitted to the shaft through the spline, resulting in the rotation of the shaft. 3. The oil delivered from the outlet port returns to the reservoir through the valve plate. 4. The inlet and outlet sides can be switched by an external valve operation to rotate the motor in the reverse direction.

【Main Components of the Travel Motor (MAG)】 ◇ Reduction gear ● A case rotation type simple planetary reduction gear is adopted. ◇ Motor (standard component) ● Counterbalance valve (standard component for all models): Prevents the motor from overrunning on a down slope. The valve is effective to prevent cavitation. 　 ● Two speed mechanism (standard component for all models): Two step speed change can be done under the same flow, which allows a wider range of speed control. (See Page 24) ● Shockless relief valve (standard component for MAG-50 through 230): Reduces shocks at the stop and prevents cavitation. ● Anti-cavitation valve (with no relief mechanism) (standard component for MAG-18 through 33): This valve has stopping performance similar to the shockless version and can prevent cavitation. ● Parking brake (standard component for MAG-50 through 230 and optional for MAG-12 through 33): A multiple-plate wet disk brake system is adopted. (Optional Component) ● Automatic two-speed system (except for MAG-12): Speed is automatically switched from Low to High or vice versa according to travel load pressure