MOTOR GP-TRAVEL 1856953 - Caterpillar

Track-Type Tractors:
D7H (S/N: 2RG1-3999; 2SB1-3999; 3XG1-3999; 4AB1-3999; 4FG1-3999; 5BF1-3999; 5WB1-3999; 77Z1-UP; 79Z1-3999; 80Z1-3999; 82Z1-3999)
D7H Series II (S/N: 2RG4000-UP; 2SB4000-UP; 3XG4000-UP; 4AB4000-UP; 4FG4000-UP; 5BF4000-UP; 5WB4000-UP; 79Z4000-UP; 80Z4000-UP; 82Z4000-UP)
D7R (S/N: 2EN1-UP; 2HR1-UP; 3DN1-UP; 3ZR1-UP; 4SR1-UP; 5MR1-UP; 6ER1-UP; 9HM1-UP)
D7R Series II (S/N: ACS1-UP; ADW1-UP; AEC1-UP; AGN1-UP)
The special instruction contains the procedure to convert the vertical mount for the carrier roller to the new, stronger, horizontal mount for the carrier roller. The procedure to update the machine by fabricating a new support, installing a new carrier roller mounting bracket, and installing a new carrier roller is provided. Illustrations and specifications are included. The procedure requires grinding welds, welding plates, and fabricating reinforcement plates.The special instruction also provides the instructions for installing a carrier roller onto machines that were not equipped with a carrier roller from the factory.The addition of carrier rollers will aid in maintaining proper sag of the track under a variety of conditions. Carrier rollers can also reduce the track slap and the noise that is caused by track movement.The Special Instruction is available through the normal literature distribution system. The publication can also be found on the Caterpillar Service Information System (SIS).