CHAPTER 4 VOID 4 TROLLEY HOIST
Section I. Description and data
4-1 Description. Void 4 trolley hoist (Figure 4-1) in void 4 starboard is a low-headroom, manually-operated hoist. Major
components include an "I" beam suspended from the void 4 overhead structure, a manual hoist assembly, load chains, a
block hook, and a brake mechanism. The trolley hoist has a net weight of 230 pounds and a standard lift height of 8 feet.
The load chains measure approximately 9 feet 6 inches and require 41 pounds of pull to lift a full load. The hook
assembly has a diameter of 1 3/7 inches. The 'I" beam measures approximately 6 inches in width.
4-2 Capabilities. This trolley hoist is used primarily for lifting heavy equipment such as the spare HP diesel-engine
driven water pumps and spare seawater pump.
4-3 Performance characteristics. Void 4trolley hoist is rated at 3000 pounds of lift. This is not sufficient to lift any
configuration of any one of the generator sets or diesel engines. These items must be moved with the ROWPU bridge
crane operating through hatches (access covers removed) to reach items in voids 4.
4-4 Equipment specifications. Technical data identifying void 4 trolley hoist equipment specifications is in
manufacturer's maintenance manual/instructions in Appendix B.
Monogram Industries, Inc.
Chester Hoist Division
4-5 Items furnished
4-5.1 Components installed as part of the void 4 trolley hoist are listed on the parts list of drawings referenced in
Appendix A and in the Components of End Item List in TM 55-1930-209-14&P-1 8.
4-5.2 Common and bulk items onboard are listed in the Expendable Supplies and Materials List in TM 55-1930-209-
4-5.3 Repair parts and special tools onboard are listed in the Repair Parts and Special Tools List in TM 55-1930-209-
4-6 Items required but not furnished. All required items are furnished.
4-7 Tools and test equipment. Use existing tools and equipment onboard. A complete list of tools and test equipment
onboard is in the Tools and Test Equipment List in TM 55-1930-209-14&P-1 8.
Section II. Description of operation
4-8 General. After selecting the load to be moved, move it laterally on the trolley hoist rail. When it is necessary to
remove the spare, HP pump or seawater pump from void 4, the void 4 hoist is used to move the pump(s) into position.
Accomplish this by removing the securing bolts from the pump foundation and attaching the trolley hoist hook. After
securing the load in place, raise, lower, or move the load laterally by manually operating the chains that control hoist