Crane, Crawler Mounted, Gasoline, 3/4 Cu. Yd., With Attachments, Koehring, Model 304 With Chrysler Engine Modification
Publisher: U.S. G.P.O.
Published: 1944
Place of publication: Washington, D.C., USA
Language: eng
Description: "GENERAL DESCRIPTION 
The Koehring Model 304 Lifting Crane maybe operated with a single line, two part line or three part line of 1 hoisting cable. (For the reeving of cable to meet these three classifications see pages 81 and 82.) Lifting Crane capacities as shown on page 28 are based on normal line speeds and line pulls for average Lifting Crsne work. For loads between 18,000 lbs. and 12,000 lbs., a three part line should be used. For loads between 12,000 lbs. and 6,000 lbs., a two part line should be used. For loads of 6,000 lbs. and under, use a single part line. A. three part line reduces hoist speed and line load two-thirds - a two part line, one half. Loads on hoist drum, hoist clutch and hoist brake are reduced proportionately. In computing lifting capacities, the weight of the hook block (250 lbs.) must be added to the load. Koehring Cranes are so designed that loads may be lowered against the gears to assist in careful handling of loads. This is accomplished by disengaging the engine clutch, engaging the hoist clutch and releasing the brake slightly. This rotates the gears backward and retards the movement of the load. (For Lifting Crane lever operation, see Working Operations for Hoisting and Lowering a Load, Page 58)."