24. SERVICE PROCEDURE 24.1.14 CHECK AND ADJUST TRACK TENSION WARNING Carry out this operation with two workers. The operator must move the machine in accordance with the signals from the other worker. The track tension is checked with the chassis raised, so it extremely dangerous if the machine is lowered by mistake during the inspection. Never move the machine while anyone is carrying out measurements. The wear of pins and bushings on the undercarriage will vary with the working conditions and soil properties. It is thus necessary to continually inspect the track tension so as to maintain the standard tension.
Carry out the check and adjustment under the same conditions as when operating (on jobsites where the track becomes clogged with mud, measure with the track clogged with mud). Inspection 1. Raise the chassis with the boom and arm. When doing this, operate the levers slowly. 2. Measure the clearance between the bottom of the track frame and the top of the track shoe at a position that is safe even if the chassis should come down Standard clearance: 358 ± 20 mm. (14.1 ± 0.8 in) * Places to measure PC450: 4 th track roller from sprocket. PC450LC: Midway between 4 th and 5 th track rollers from sprocket. Track frame 358 ± 20mm 358 ± 20 PC450-ENG 3-33 Track shoe