MAINTENANCE PROCEDURE 4.9.1.h CHECK AND ADJUST RUBBER SHOE TENSION (Machine equipped with rubber shoes) The wear of the rubber shoe will vary with the work conditions and type of soil, so inspect the wear and track ten- sion whenever necessary. Stop the machine on firm, horizontal ground when carrying out the inspection and maintenance. In particular, on new machines or after new tracks have been installed and the tension has been set to the speci- fied value, the track tension will become loose in the first 5 to 30 hours when the machine has been used for a cer- tain amount of repeated travel.
If the track tension is adjusted frequently until the initial loosening no longer occurs, this will prevent the shoes from coming off due to insufficient track tension. If operations are carried out when the rubber shoe is loose, the track will come off and it will cause premature wear of the core. 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 rubber shoe and the bottom surface of the wooden block. Standard deflection Deflection “a“ should be 1 to 3 mm (0.039 to 0.118 in.). If the track tension is not at the standard value, adjust it in the following manner. ADJUSTMENT WARNING There is danger of the plug flying out under the high in- ternal pressure of the grease. When loosening plug (1), never loosen it more than one turn. Never loosen any part other than plug (1). Never put your face in line with the mount of plug (1). If the Rubber shoe tension is not relieved by this proce- dure, please contact your Komatsu Dealer.
INCREASING TRACK TENSION IMPORTANT The standard value is low, so be careful not to tighten the rubber shoe too much. Prepare a grease gun. 1. Pump in grease through grease fitting (2) with a grease pump. 2. To check if the tension is correct, run the engine at low idling, move the machine slowly forward (by an amount equal to the length of track on ground), then stop the ma- chine. 3. Check the rubber shoe tension again, and if the tension is not correct, adjust it again. 4. If the tension is still low after supplied grease, the rubber shoe needs to be replaced or the seal in the cylinder needs to be replaced. Ask your Komatsu Dealer for re- placement. 187