CMAA 74 PDF

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The Crane Manufacturers Association of America, Inc. (CMAA) is an independent incorporated trade association affiliated
with MHI.
MHI provides CMAA with certain services and specifically in connection with these Specifications, arranges for their
production and distribution. Neither MHI, its officers, directors or employees have any other participation in the development
and preparation of the information contained in the Specifications.
All inquiries concerning these Specifications should be directed in writing to the Vice President of the CMAA Engineering
Committee, c/o Crane Manufacturers Association of America, Inc., 8720 Red Oak Blvd., Suite 201, Charlotte, NC 28217. For
a response to technical questions, use the CMAA web site www.mhi.org/cmaa or write directly to the CMAA Engineering
Committee at the above address.

TABLE OF CONTENTS

74-1 GENERAL SPECIFICATIONS………………………………………………………………………………………………………….7
SCOPE …………………………………………………………………………………………………………………………………………………………………….7
BUILDING DESIGN CONSIDERATIONS……………………………………………………………………………………………………………………….9
CLEARANCE…………………………………………………………………………………………………………………………………………………………….9
CRANE RUNWAY………………………………………………………………………………………………………………………………………………………9
RUNWAY CONDUCTORS…………………………………………………………………………………………………………………………………………12
RATED CAPACITY…………………………………………………………………………………………………………………………………………………..12
DESIGN STRESSES ………………………………………………………………………………………………………………………………………………..12
GENERAL……………………………………………………………………………………………………………………………………………………………….12
PAINTING……………………………………………………………………………………………………………………………………………………………….12
ASSEMBLY AND PREPARATION FOR SHIPMENT………………………………………………………………………………………………………13
TESTING ………………………………………………………………………………………………………………………………………………………………..13
DRAWINGS AND MANUALS……………………………………………………………………………………………………………………………………..13
ERECTION ……………………………………………………………………………………………………………………………………………………………..13
LUBRICATION…………………………………………………………………………………………………………………………………………………………13
INSPECTION, MAINTENANCE AND CRANE OPERATOR TRAINING ……………………………………………………………………………. 13
74-2 CRANE CLASSIFICATIONS ………………………………………………………………………………………………………….14
GENERAL……………………………………………………………………………………………………………………………………………………………….14
CLASS A (STANDBY OR INFREQUENT SERVICE) ……………………………………………………………………………………………………..14
CLASS B (LIGHT SERVICE)………………………………………………………………………………………………………………………………………14
CLASS C (MODERATE SERVICE)……………………………………………………………………………………………………………………………..14
CLASS D (HEAVY SERVICE)……………………………………………………………………………………………………………………………………. 14
CRANE SERVICE CLASS IN TERMS OF LOAD CLASS AND LOAD CYCLES…………………………………………………………………. 14
74-3 STRUCTURAL DESIGN ………………………………………………………………………………………………………………..16
MATERIAL………………………………………………………………………………………………………………………………………………………………16
WELDING……………………………………………………………………………………………………………………………………………………………….16
STRUCTURE…………………………………………………………………………………………………………………………………………………………..16
ALLOWABLE STRESSES………………………………………………………………………………………………………………………………………….22
DESIGN REQUIREMENTS………………………………………………………………………………………………………………………………………..32
BRIDGE END TRUCK……………………………………………………………………………………………………………………………………………….36
OPERATOR’S CAB…………………………………………………………………………………………………………………………………………………..36
STRUCTURAL BOLTING…………………………………………………………………………………………………………………………………………..36
GANTRY CRANES …………………………………………………………………………………………………………………………………………………..36
RESTRAINT DEVICES ……………………………………………………………………………………………………………………………………………..37
74-4 MECHANICAL DESIGN…………………………………………………………………………………………………………………38
BRIDGE DRIVES……………………………………………………………………………………………………………………………………………………..38
GEARING ……………………………………………………………………………………………………………………………………………………………….38
BEARINGS ……………………………………………………………………………………………………………………………………………………………..39
BRIDGE BRAKES…………………………………………………………………………………………………………………………………………………….40
SHAFTS………………………………………………………………………………………………………………………………………………………………….40
COUPLINGS……………………………………………………………………………………………………………………………………………………………42
WHEELS…………………………………………………………………………………………………………………………………………………………………43
BUMPERS AND STOPS……………………………………………………………………………………………………………………………………………47
74-5 ELECTRICAL EQUIPMENT …………………………………………………………………………………………………………..48
GENERAL……………………………………………………………………………………………………………………………………………………………….48
MOTORS – AC AND DC……………………………………………………………………………………………………………………………………………48
BRAKES …………………………………………………………………………………………………………………………………………………………………53
6 CMAA SPECIFICATION NO. 74-2020
CONTROLLERS, ALTERNATING AND DIRECT CURRENT …………………………………………………………………………………………..54
RESISTORS ……………………………………………………………………………………………………………………………………………………………60
PROTECTION AND SAFETY FEATURES……………………………………………………………………………………………………………………60
MASTER SWITCHES ……………………………………………………………………………………………………………………………………………….62
FLOOR OPERATED PENDANT PUSHBUTTON STATIONS…………………………………………………………………………………………..65
LIMIT SWITCHES…………………………………………………………………………………………………………………………………………………….67
INSTALLATION………………………………………………………………………………………………………………………………………………………..67
RUNWAY/BRIDGE CONDUCTOR SYSTEMS……………………………………………………………………………………………………………… 67
VOLTAGE DROP……………………………………………………………………………………………………………………………………………………..68
INVERTERS (Variable Frequency Drives)…………………………………………………………………………………………………………………….69
REMOTE CONTROL ………………………………………………………………………………………………………………………………………………..70
WIRELESS DATA EXCHANGE BETWEEEN CRANE TO CRANE AND/OR CRANE TO BUILDING…………………………………….. 70
COLLISION AVOIDANCE………………………………………………………………………………………………………………………………………….72
WEIGH SCALE SYSTEM…………………………………………………………………………………………………………………………………………..72
MAGNETS / MAGNET CONTROLLERS………………………………………………………………………………………………………………………73
RAIL CLAMPS OR STORM BRAKES FOR OUTDOOR CRANES ……………………………………………………………………………………73
74-6 CRANE INQUIRY DATA SHEET…………………………………………………………………………………………………….75
74-7 APPENDIX…………………………………………………………………………………………………………………………………..80
STRUCTURAL…………………………………………………………………………………………………………………………………………………………80
MECHANICAL …………………………………………………………………………………………………………………………………………………………80
ELECTRICAL…………………………………………………………………………………………………………………………………………………………..81
74-8 GLOSSARY …………………………………………………………………………………………………………………………………82
74-9 INDEX …………………………………………………………………………………………………………………………………………87

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