OPERATION OF MEDIUM WRECKER (Contd)
Position rear of wrecker directly in front of disabled vehicle.
If tires, transmission, and steering of disabled vehicles are serviceable, proceed to step 4 and install towbar
(10) to front bumper shackle brackets (14).
If disabled vehicle has no shackle brackets (14), or if tires, transmission, and/or steering of disabled vehicle
are unserviceable, proceed to step 5d and use lift-tow procedure.
To tow a disabled vehicle using front bumper shackle brackets:
Remove lifting shackles (13) from bumper (15) of disabled vehicle.
Install clevis (12) end of towbar (10) on front bumper shackle brackets (14) and secure in place with
clevis bolt (16) and safety pin (11).
Install yoke (18) end of towbar (10) to wrecker pintle hook (19).
Crisscross and connect utility chains between vehicles in the event towbar breaks or becomes
disconnected. Failure to do this will result in injury or death.
Crisscross and connect utility
chains (17) to spring hangers (20) on towed
vehicle and secure to towing vehicle.
service air line (22) to respective half coupling
(21) on each vehicle.
Release parking brake and
place transmission, transfer case, and PTO of
disabled M939/A1/A2 series vehicles in neutral.
Reverse steps a through f
after completion of towing.