jcb JS200 Service Manual page 396

Hydraulics
Section E Section E
81 - 1 Rotary Coupling 81 - 1
Operation
The rotary coupling consists of the inner axle and outer rotor with packing rings, 'O'-rings, thrust plate and cover. In the axle
and rotor, there are pairs of ports and oil passages each pair being sealed from the others by packing rings and 'O'-rings. Both
the axle and rotor can rotate and the oil can flow freely through the oil grooves.
The coupling is located in the centre of the machine between the lower and upper sections and rotates around the slew
centreline. It receives the supply and return pressurised oil passing from the control valve to the traction motor and is not
affected by the rotation of the lower and upper sections, allowing the machine to slew 360° in both directions.
9803/6400 Issue 1