24. SERVICE PROCEDURE 24.2.3 CHECK, ADJUST TRACK TENSION The wear of the undercarriage pins and bushings differs accord- ing to the working conditions and soil quality, so check the track tension from time to time 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). CHECK Stop the machine on flat ground (drive forward and stop the machine without using the brakes). Place a straight rod across the top of the carrier roller and idler as shown in the diagram, then measure the distance between the rod and the grouser at the center.
The standard distance for the track tension is 20 - 30 mm (0.8 - 1.2 in). If the tension is not the standard, adjust as follows. 20-30 mry (0.8-1.2in) 078120 ADJUSTMENT a WARNING The grease is under high pressure, so there is danger that it will spurt out. For this reason, do not loosen lubricator @ more than one turn. Do not loosen any part other than lubricator 0. Furthermore, do not bring your face in front of lubricator 0. If the track tension is not relieved by this procedure, please contact your Komatsu distributor. When increasing tension Pump in grease through lubricator @ with a grease pump.
To check that the correct tension has been achieved, move the machine backwards and forwards. Check the track tension again, and if the tension is not correct, adjust it again. 4. Continue to pump in grease until S becomes 0 mm. If the tension is still loose, the pin and bushing are excessively worn, so they must be either turned or replaced. Please contact your Komatsu distributor. 3-28