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| Illustration 1 | g01685154 |
Hydraulic oil passages within the swivel | |
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| Illustration 2 | g01953724 |
Port (1), Stator (2), Rotor (3), Port (4), Port (5), Port (6) and Channel (7) | |
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| Illustration 3 | g02162117 |
Circuit identification | |
The swivel is mounted to the center of the upper housing. The transfer of hydraulic oil from the input lines in the upper housing to the hydraulic cylinder in the lower housing is the purpose of this component. The swivel allows the work tool to rotate 360 degrees without damaging the cylinder lines. Because rotor (3) is not fixed in place on stator (2), the rotor is free to rotate on the shaft of the stator. This allows the upper housing to remain stationary while the lower housing rotates.
Oil can enter the swivel at port (1) or port (6). The direction of the function (open or close) that was selected by the operator determines the point of entry of the oil. When oil enters port (1), the oil flows along the passage in stator (2) and out port (4) to the cylinder. Return oil will then flow back into port (5) from the cylinder. The oil flows through the passage in stator (2) and out port (6) to the hydraulic tank.
When oil enters port (6), the oil flows along the passage in stator (2) and out port (5) to the cylinder. Return oil will then flow back into port (4) from the cylinder. The oil flows through the passage in stator (2) and out port (1) to the hydraulic tank.
Because stator (2) is bolted to the upper housing, the stator remains stationary. Rotor (3) rotates with the lower housing.
Note: When a seal has failed, channels (7) are used to purge the oil out of the swivel. Oil leakage is an indicator of a failed seal.