OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
E-171 E-171
9803/9880-3
Rotary Coupling
Operation
The coupling is located in the centre of the machine
between the lower and upper sections and rotates around
the slew centreline. 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.
Fig 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