Usage:
773, 773B, 777 Trucks
Description of Change: New rock ejector assemblies are used in body groups for 773, 773B and 777 Trucks. The new ejector assemblies are the same as the former ejectors, except a reinforcement plate is welded to each side. This increases the strength of the ejector. Formerly, it was possible for the ejector to bend in some conditions. A bent ejector can cause tire damage.
Also, on 777 Trucks, the mounting brackets for the rock ejectors are changed to permit installation of the ejectors in either of two positions (an inner position for standard tires, or an outer position for optional tires), and to change the pivot point of the ejector. The pivot point of the ejector is lowered so the upper part of the ejector will not come into contact with the body before the lower end, when the lower end of the ejector moves back. Formerly, when the truck body was lifted, it was possible for a rock between the tires to push the ejector back and, if the upper part hit the body, the ejector was bent.
Adaptable To: For 773 and 773B Trucks, the new 6G4290 Ejector Assemblies are a direct replacement for the former 9D1557 Ejectors, and are adaptable to 773 Trucks 63G671-Up and 773B Trucks 63W1-Up.
For 777 Trucks, the new 6G2201 Ejector Assemblies are in effect with Serial Number 84A560, and are not adaptable to earlier trucks. For 777 Trucks 84A1-559, new 6G4432 Ejector Assemblies are available as a replacement for the former 9D5007 Ejectors.
If desired, a conversion can be made to increase the strength of either the former 9D1557 or 9D5007 Ejectors. Reinforcement plates can be welded to each side of either former ejector as shown in the illustrations. The addition of these plates will change the former ejector to the new ejector assembly.
Specifications to fabricate and install reinforcement plates for 9D1557 Ejectors.
Specifications to fabricate and install reinforcement plates for 9D5007 Ejectors.