M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
Remove shouldered shaft (16) and thrust
bearing (17) from motor (15).
Remove four screws (18), mounting
flange (19), and preformed packing (20)
from motor (15).
Model B has a backup ring. Do step 11.1 for
Remove thrust washer (21), seal (22)
and seal (23) from mounting flange (19).
(11.1) Remove thrust washer (21), seal (22),
back-up ring (22.1), and seal (23) from
mounting flange (19).
Adhesives, solvents, and sealing compounds can burn easily, can give off harmful
vapors, and are harmful to skin and clothing. lb avoid injury or death, keep away
from open fire and use in well-ventilated area. If adhesive, solvent, or sealing
compound gets on skin or clothing, wash immediately with soap and water.
Clean all metal parts in drycleaning solvent.
Inspect each part for damage.
Replace damaged parts.
There are two models of swing drive motors.
Model B has a backup ring and no spacer on
Install preformed packing (1) and
plug (2) in motor (3).
has a backup ring. Do step (2.1) for
Install seal (4) and seal (5), and thrust
washer (6) in mounting flange (7).
Install backup ring (3.1), seal (4), seal (5) and
thrust washer (6) in mounting flange (7).
Install preformed packing (8), mounting
flange (7) and four screws (9) on motor (3).