From inside (document excerpt):
46 / 49 / 55cc GASOLINE POWERED ANTI-VIBRATION (AV) CHAIN SAWS MODEL NAME MS1846AV MS2046AV M1849AV MS2049 MAC 4600 MAC 4600 MAC 4600 MAC 4600 MAC 4600 MAC 4600 MAC 4900 MAC 4900 MAC 4900 MAC 4900 MAC 4900 MAC 5500 PM1846AV PM2046AV PM1849AV PM2049AV PROMAC 4700 PROMAC 5000 PROMAC 5500 SILVER EAGLE 2818 SILVER EAGLE 3020 TIMBERBEAR 20 TIMEBERBEAR ()SERIAL NUMBER PREFIX – MODEL NUMBER 600465-00 600465-01 600465-02 600465-07 600465-09 600465-12 600498-01 600498-02 600498-03 600498-08 600498-13 600555-00 600465-03 600498-20 600555-02 BAR & CHAIN ENGINE SIZE 46cc 46cc 49cc 49cc 46cc 46cc 46cc 46cc 46cc 46cc 49cc McCulloch products are identified by a model number (in this instance 600465) followed by a suffix number (00).
Suffix numbers denote variations in parts or assemblies used in the manufacture of this product. Illustrated Parts Lists (IPLs) contain a PART NUMBER, DESCRIPTION, UNITS per assembly and STOCKING CODE for each part. Stocking Codes are: A – Dealer stocked. Fast to medium moving part. B – Distributor stocked. Medium to slow moving part. C – Factory stocked. Slow moving part. NOTE: (-) The following explains symbols and footnotes in this IPL: A dash preceding a PART NUMBER indicates that it is a new part number, different from the one listed in the previous IPL for this unit. One or more dots (. Spring, Starter) preceding a part DESCRIPTION indicates the part is included in the kit or assembly described directly above the dot(s). If four dashes appear in place of a PART NUMBER, the part is not available individually but is included in the next higher assembly or subassembly. Circled numbers preceding a DESCRIPTION footnote the part or assembly to additional information on the page. An asterisk denotes that choices follow or precede. Serial Number Prefix 21- denotes CARB approved unit — all parts are interchangeable with Serial Number Prefix 11-. 20 49cc 49cc 49cc 49cc 55cc (.) (– –) 18 20 18 20 46cc 46cc 49cc 49cc ¿¡ (*) 55cc () 22- 600555-01 20 49cc 55cc MARCH 2003 The policy of McCulloch is one of continual improvement in design, manufacturing and engineering advancement wherever possible to assure still finer power tools. Hence, specifications, equipment colors, design and manufacturer’s suggested list prices are subject to change without notice. McCulloch reserves the right to make such changes without prior notification or obligation to backfit or supply backfit components for units previously shipped from the factory.