7-22 Check item Measuring method Criteria Allowable Remedy Parking brake torque After completion of assembly, set the torque wrench on the shaft end, and measure the braking torque generat- ed when the shaft starts to rotate 92.6 kgf·m (670 lbf·ft) 82.8 kgf·m (599 lbf·ft) Replace all of separator, friction plates and springs Standard of replacing friction and separating plate. When measuring parking brake torque, it needs to disassemble traveling unit to motor and reduction gear portion, and it’s so hard. The right allowable value is a standard of replacing friction and separating plate. If it is impossible to disassemble travel- ing unit, refer to the right value.
Measure the total thick- ness of 4 pieces of fric- tion plate and 5 pieces of separating plate. 22.76 mm Thickness : 21.3 mm Replace all sepa- rating and friction plates and springs. Check item Measuring method Judging criteria and remedy Shaft Measure the wear at contacting surface of oil seal (3) with the surface roughness tester If the depth of shaft wear is less than 0.05 mm, the shaft is reusable. ※ In case of replacing the shaft (9), replace oil seal (3) at the same time. Bearings Replace bearings (10, 51) after decided hours Replace bearings (10, 51) before hour meter of host machine indicates 10,000 hours.
※ In case replacing the bearings (10, 51), replace both inner and outer races at the same time. ※ Also the bearing shims (52) must be readjusted when replaced shaft (9) and/or bearings (10, 51). Contact dealers for jigs and tools required. Splines Replace if the wear of splines exceeds the allowable value If the wear of splines is less than 0.3 mm, the spline is reusable. Overload relief valve Do not try to adjust the valve, since special hydraulic test bench is required for inspecting and adjusting the pressure Replace relief valve part as an assembly each time the host machine works for 10,000 hours.