Usage:
769D (5SS1-Up),
773D (7CS1-Up) Off-Highway Trucks;
771D (6YS 1-Up),
775D (8AS1-Up) Quarry Trucks
Reference: Special Instruction, REHS0386; 769D Off-Highway Truck And 771D Quarry Truck Assembly Procedure; Page 18; "Install the Rock Ejectors".
Special Instruction, REHS0387; 773D Off-Highway Truck And 775D Quarry Truck Assembly Procedure; Page 20; "Install the Rock Ejectors".
The referenced literature does not supply a dimension along the length of the body for attaching the brackets that hold the rock ejector. The dimension along the length of the body will vary depending upon the style of body to be installed. An alternate method of positioning the rock ejectors follows. This alternate method should ensure that the rock ejector will not contact the wheel.
Rock ejector bracket placement.
1. Place 6G-7773 Pin (2) in rock ejector bracket (1) where the rock ejector will be connected.
2. Attach string (3) to the pin. Make sure the string is centered in the bracket.
3. Attach plumb bob (5) to the other end of the string.
NOTE: Make sure that the string is long enough to extend from the bottom of the installed truck body to well past center of rear wheels (4).
4. Measure width (A) of the rock ejector. Divide measurement (A) by two to obtain half the width of the rock ejector. Add an additional 150 mm (6.0) to half the width of measurement (A). This will be dimension (B) used to position rock ejector bracket (1).
NOTE: The formula is: B=(A÷2)+150 mm
5. Place rock ejector bracket (1) in position on the bottom of the truck body.
NOTE: The truck should be parked on a level surface.
6. Adjust the location of bracket (1) until the string is suspended centrally between the two tires. Refer to dimension (C). Also, the string should be positioned away from the closest point on rear wheel assembly (4). Use dimension (B) determined in Step 4 to position the string away from wheel assembly (4).
NOTE: This should ensure a clearance of 150 mm (6.0 in) between the rock ejector and the wheel.
7. Weld the bracket in place according to the procedure in the referenced Special Instructions.