MAINTENANCE PROCEDURE 4.9.1.f CHECK AND ADJUST TRACK TENSION (Machines equipped with steel shoes) 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 a wooden block (3) long enough to cover the dis- tance between the idler roller (1) and the track sliding plate (2), then position it on 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 5 to 15 mm (0.197 to 0.6 in.). If the track tension is not at the standard value, adjust it in the following manner. ADJUSTMENT There is danger of plug (1) flying out under the high in- ternal pressure of the grease. Never loosen plug (1) more than 1 turn. Never loosen any part other than plug (1). Never put your face in the mounting direction of plug (1). If the track tension cannot be loosened with the proce- dure given here, please contact your Komatsu Dealer. INCREASING TRACK TENSION Prepare a grease gun. 1.
Pump in grease through grease fitting (2) with a grease pump. 2. To check that the correct tension has been achieved, run the engine at low idling, move the machine slowly for- wards (7 - 8 m), then stop the machine. 3. Check the track tension again, and if the tension is not correct, adjust it again. 183 WARNING