M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
17-9. SWING DRIVE REMOVAL/REPAIR/INSTALLATION (CONT).
Aline swing drive (1).
Adjust swing drive (1) backlash to 0.005 in. (0.127 mm).
If wedges were not removed, go to step (8).
Install two screws (2) and washers (3). Tighten screws. Do not remove lifting device.
Disconnect battery cables and electrical connectors from all sensitive electrical
components prior to electric welding. Electrical current from welder may cause
damage to equipment.
Disconnect battery cables and electrical connectors from all electrical equipment.
Unsafe welding practices can cause serious injury from fire, explosions, or
harmful agents. Allow only authorized personnel to weld or cut metals and follow
safety precautions in TM 9-237. Protective clothing and goggles must be worn;
adequate protective equipment used, a suitable fire extinguisher kept nearby, and
requirements of TM 9-237 strictly followed.
With the aid of a welder, tack-weld two wedges (4) to frame ring (5).
Remove two screws (2), washers (3), and swing drive (1).
With the aid of a welder, weld two wedges (4) to frame ring (5).
Adhesives, solvents, and sealing compounds can burn easily, can give off harmful
vapors, and are harmful to skin and clothing. To 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.
Apply sealing and thread locking compound to nine screws (2).
Install swing drive (1) with nine screws (2) and washers (3).