China HITACHI EX100 120-1 SWING DEVICE SLEW BOX PLATE THRUST SPACER PLANETARY 1 2 (OEM HI 4176071) | Tonkee®

Slew Box: The slew box is a critical part of the swing device in excavators like the Hitachi EX100-1 and EX120-1.

It is essentially a large, durable housing that encases various components responsible for the rotation of the upper structure. The slew box provides support and protection to these components and ensures that they remain in alignment for optimal performance.

Plate Thrust Spacer: The plate thrust spacer, identified by the OEM part number HI 4176071, is a precision-engineered component that plays a crucial role in maintaining the correct spacing and alignment of the planetary gears within the swing device. This spacer ensures that there is minimal friction and wear between the gears during rotation, which is essential for the longevity and smooth operation of the swing device.

Planetary Gears: Planetary gears are a key part of the swing mechanism.

They consist of a central sun gear, multiple smaller planet gears that orbit around the sun gear, and an outer ring gear. As power is applied to the sun gear, it is transmitted through the planet gears to rotate the outer ring gear. This rotation of the outer ring gear is what causes the upper structure of the excavator to swing. Proper spacing and alignment of these gears are critical for maintaining the precision and efficiency of the swing motion.

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