hitachi — MAINTENANCE STANDARD

UNDERCARRIAGE / Center Joint MAINTENANCE STANDARD W3-3-11 Item Allowable Limit (basis of judgment) Remedy Bushing 1. Wear more than 0.2 mm (0.008 in) Replace 2. Seizure and abnormal wear Replace 3.

Uneven wear within 180° Wear Area Within Half Range T157-01-01-040 Replace Body, Spindle Sliding surface with seals Heavily damaged one by seizure or foreign matter Replace Sliding surface be- tween body and spin- dle other than sliding surfaces with seals 1) Excessively worn one by seizure or foreign matter, or one having the score of 0.1 mm (0.004 in) or more Replace 2) One having the score of less than 0.1 mm (0.004 in) Repair the surface smooth by using an oil stone Sliding surface with ring 1) One that has worn 0.5 mm (0.02 in) or more, or excessively worn Replace 2) One that has worn 0.5 mm (0.02 in) or less Repair the surface smooth 3) One that has scores due to seizure or foreign matter but the damage is less than the allowable wear limit 0.5 mm (0.02 in) and is repairable Repair the surface smooth Cover Sliding surface with ring 1) One that has worn 0.5 mm (0.02 in) or more Replace 2) One that has worn less than 0.5 mm (0.02 in) Repair the surface smooth 3) One that has scores due to seizure or foreign matter but the damage is less than the allowable wear limit 0.5 mm (0.02 in) and is repairable Repair the surface smooth