24. SERVICE PROCEDURE 24.2.4 CHECK AND ADJUST TRACK TENSION ¤ WARNING For details of starting the engine and operating the work equipment, see “12.1 CHECK BEFORE STARTING ENGINE”, “12.2 STARTING ENGINE”, “12.3 OPERATIONS AND CHECKS AFTER STARTING ENGINE”, and “12.8 OPERATION OF WORK EQUIPMENT” in the OPERATION section. The wear of the pins and bushings on the undercarriage will vary with the working conditions and type of soil, so inspect the track tension frequently in order to maintain the standard tension. Stop the machine on firm, horizontal ground when carrying out the inspection and maintenance. Checking 1.
Run the engine at low idling, move the machine forward a distance equal to the length of track on ground, then stop the machine. 2. Choose wooden block 3 that will reach from idler 1 to carrier roller 2 , then place it on top of the track. 3. Measure the maximum deflection between the top surface of the track and the bottom surface of the wooden block. Standard deflection Deflection “a” should be 10 to 30 mm (0.4 to 1.2 in). If the track tension is not at the standard value, adjust it in the following manner. 3-31