This factory workshop manual covers the following models and serial number ranges:
GD610, GD620, GD660, GD670 SERIES
GD621A-1 S/N 10001 AND UP
GD622A-1 S/N 20001 AND UP
GD623A-1 S/N 30001 AND UP
GD625A-1 S/N 50001 AND UP
GD672A-1 S/N 20001 AND UP
GD611A-1 S/N 10001 AND UP
GD613A-1 S/N 30001 AND UP
GD661A-1 S/N 10001 AND UP
GD663A-1 S/N 30001 AND UP
GD621R-1 S/N 10001 AND UP
GD623R-1 S/N 30001 AND UP
GD611R-1 S/N 10001 AND UP
GD613R-1 S/N 30001 AND UP
GD615A-1 S/N 60001 AND UP
GD625A-1C S/N 60001 AND UP
GD625A-1A S/N 60001 AND UP
GD625A-1B S/N 65001 AND UP
This factory service manual consists of 662 pages and includes easy-to-read text sections with top quality diagrams, pictures, and illustrations. The step-by-step instructions demonstrate how to fault find or complete any repair or overhaul correctly and efficiently, saving time and avoiding costly mistakes. Additionally, all specifications and tolerances are listed, and the functions of components and systems are explained.
