DOC-20230111-WA0038.

UPPERSTRUCTURE / Swing Device
Assemble Swing Device
• Be sure to read “Precautions for Disassembly and
Assembly” thoroughly on page W1-1-1 before
starting the assembly work.
IMPORTANT: Apply grease to the inner diameter of
oil seal (21), and then install it with
its lip facing up (the motor side).
1. Install oil seal (21) into housing (22).
2. In case bearings (20) and (24) were removed,
housing (22) must be replaced along with them.
Press the outer races of bearing (20) and (24)
into housing (22).
IMPORTANT: Dust seal (25) shall be installed with
its lip portion facing downward
(outside).
3. Install dust seal (25) into housing (22).
IMPORTANT: Take care not to damage oil seal (21)
with shaft (27).
Be sure plug (23) has been
removed. If it is in place, oil seal
(21) may be deformed.
7. Place housing (22) slightly on shaft (27) and
install it on while take care of the positions for
guide (26) and dust seal (25). Do not deform the
dust seal.
IMPORTANT: Nut (18) shall be installed with its
identification groove facing up (the
motor side). Apply the grease to the
thread of the nut.
8. Press the bearing (20) inner race onto shaft
(27) and temporarily tighten nut (18).
4. Press guide (26) and the inner race of roller
bearing (24) onto shaft (27).
5. Apply the grease to the outer surface of guide
(26).
CAUTION: Housing (22) weight: 19 kg (42 Ib)
6. Install eye bolts (M14, pitch 2.0) into the
mounting bolt hole on ring gear (19) of housing
(22). Lift the housing by crane.
W2-6-11