12. OPERATION 12.18.2 INSPECTION AND ADJUSTMENT Properly adjust track tension. Tension should be measured at clearance A shown in the diagram – usually 20 to 30 mm (0.8 to 1.2 in) at this point. For rocky terrain, tighten tracks slightly. In clay or sandy areas, slightly loosen them. (For inspection and adjustment proce- dures, refer to “24.2 WHEN REQUIRED”). Check idler rollers for oil leakage as well as for loose bolts and nuts. If any trouble is detected, repair immediately. Check the clearance between the idler guide plate and the track frame. If clearance B increases, idler may develop side motion and tracks may come off.
(For inspection and adjustment proce- dures, refer to “24.2 WHEN REQUIRED”.) 12.18.3 INSPECTION AND REPAIR Frequent inspection and prompt repair will reduce repair costs. The following items for inspection will serve as a guide to maintenance service of each undercarriage part. Perform periodical inspection and contact the Komatsu distributor in your area when machine has approached repairable limits and reversing limits. MEASURING HEIGHT OF GROUSER After taking up slack in track shoes, measure height at center of shoe as shown below. Standard height (h): 93 mm (3.7 in) Repair limits: 30 mm (1.2 in) MEASURING OUTSIDE DIAMETER OF TRACK ROLLER 1. Measure height (size C) of link tread as shown.
2. Stop machine at position where link tread, whose size C has been measured completely, contacts roller tread. Then measure size B. 3. Calculate outside diameter of tread (size A): A = (B – C) x 2 Standard size (A): 270 mm (10.6 in) Repair limits: 234 mm (9.2 in) 2-74