The coupling is located in the centre of the machine
between the lower and upper sections and rotates around
the slew centre line. The supply and return oil flow to the
coupling, piped from the upper to the lower section, is not
affected by the rotational movement and allows the
machine to slew 360° in both directions.
The rotary coupling consists of the inner axle 11 and outer
rotor 13 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.
Table 1.
Item
Part Name
11
Axle
12
V-ring
13
Rotor
14
O-ring
15
Packing ring
16
Thrust plate
17
Socket head screw
18
O-ring
19
Cover
20
Socket head screw
E-171
Operation
9803/5100-1
Section E - Hydraulics
Rotary Coupling
Fig 1.
Operation
E-171