Section III. Operating instructions
4-9 Operating controls. Controls for maneuvering loads are the pull chains located on the trolley hoist (Figure 4-1).
4-10 Prestart Procedures
Ensure trolley hoist has been properly lubricated. Chains must be kept clean and properly lubricated,
because dirt damages or jams gears and creates excessive wear and operational delays. Chains, when
rubbed with an open hand, should be free of dirt and grit. A light coat of lubricant should be present on
Check chains for proper seating on gears and freedom from twisting or other defects.
Ensure that choice of slings matches load to be lifted.
Move trolley hoist directly over the load by using trolley lateral movement chain.
Be sure load will clear all equipment in movement path.
4-11 Operating procedures
Ensure trolley hoist is directly over the load to be moved and then lower trolley hoist hook and attach it to
Using chains, raise load a few inches and ensure that load is being lifted vertically. Loads must not be
pulled to one side or in one direction.
Lift load only high enough to move it safely to new location.
Using trolley hoist chains, manually move load to desired location and lower into place.
4-12 Shutdown procedures
Remove and secure lifting devices and jigs (if used).
Raise lifting hook on void 4 trolley hoist to top position and secure chains to keep them from swinging.
4-13 Operation under extreme conditions. To ensure efficient operation of the trolley hoist in cold or hot
weather, make sure that hoist is clean and properly lubricated. Changes in weather conditions do not require any
Section IV. Maintenance instructions
4-14 General. When inspecting void 4 trolley hoist components, give special attention to pulleys, lifting hooks, chains,
slings and other load bearing components. Keep inspection reports and records on all hoist equipment. Required
maintenance forms and records are explained in DA PAM 738-750. When performing maintenance, be sure to observe
precautions in this manual and in the manufacturer's manual. Due to stress and tolerance requirements for the trolley
hoist, replace parts or components of the trolley hoist with items the same as original construction. Use materials in
accordance with the drawings referenced in Appendix A.
Notify IDS/IGS maintenance unit after repairing or replacing crane load bearing
parts or parts on any lifting slings or rigs used with the crane. They must
proof test and safety inspect the repaired item in accordance with TB 43-0142.
In addition, the crane and all slings and lifting devices used with the crane
must be proof and function tested, and safety inspected to this standard every
12 months. Record and maintain certification of all proof testing.
4-14.1 Maintenance concept
4-14.1.1 Unit level and IDS/IGS maintenance for the bridge crane system is performed onboard by barge
crewmembers whenever possible.