Komatsu — 12.1 CHECK BEFORE STARTING ENGINE

12. OPERATION CHECK WHEEL HUB NUTS, TIGHTEN Check for loose hub nuts, and if any are loose, tighten 3 or 4 times to the specified torque in the order given in the diagram. Front Tightening torque: 1320 ± 147 N•m (135 ± 15 kgf•m, 976.5 ± 108.5 lbft) (When thread and nut seat are not coated with grease) 927 ± 103 N•m (94.5 ± 10.5 kgf•m, 683.5 ± 75.9 lbft) (When thread and nut seat are coated with molybdenum disulphide grease) Rear If the hub nuts have been tightened again after replacing the tire, travel for 5 to 6 km, then tighten again to settle all the contacting parts.

In particular, there are more contacting parts on the rear wheels than on the front wheels, so it will take time for the parts to settle. For this reason, repeat the tightening process for the first 50 hours after installation. However, on the rear wheels, there are hub nuts at 3 places on the inside, but these are for temporary assembly, so there is no need to tighten the inside hub nuts after the outside hub nuts are tightened. AE133200 Outside hub nuts Inside hub nuts AE133210 CHECK INFLATION PRESSURE OF TIRES Measure the inflation pressure with a tire pressure gauge while the tires are cool before starting work. Check for damage or wear to the tires and the rims.

Check for loose wheel hub nuts (bolts). The proper inflation pressure is shown below. HD465-5 HD605-5 NOTICE If the tires are used when the inflation pressure is less than the value given in the table above, the rim may be damaged. Always keep the tire inflation pressure within +0 – +0.03 MPa (0.3 kgf/cm 2 , 4.3 PSI) of the value in the table above.

2-55 Tire size Inflation pressure 24.00-35-36PR (standard) 0.44 MPa (4.5 kgf/cm2, 63.9 PSI) 24.00R35flfl (if equipped) 0.69 MPa (7.0 kgf/cm2, 99.4 PSI) 21.00-35-36PR (if equipped) 0.54 MPa (5.5 kgf/cm2, 78.1 PSI) 21.00-35-32PR (if equipped) 0.49 MPa (5.0 kgf/cm2, 71.0 PSI) Tire size Inflation pressure 24.00R35flfl (standard) 0.69 MPa (7.0 kgf/cm2, 99.4 PSI) 24.00-35-36PR (if equipped) 0.44 MPa (4.5 kgf/cm2, 63.9 PSI)