STRUCTURE, FUNCTION, & MAINTENANCE STANDARD IDLER 12 Unit: mm No. Remedy 1 2 Rebuild or replace 3 4 5 6 Replace bushing 7 PC210/240-7K 10-17 Check item Criteria Outside diameter of protruding Standard size Repair limit 538 — Outside diameter of tread 500 488 Thickness of tread 26 20 Total width 159 — Width of tread 37.5 43.5 Clearance between shaft and bushing Standard size Tolerance Standard clearance Clearance limit Shaft Hole 65 -0.250 -0.350 +0.074 -0.036 0.214 - 0.424 1.5 Interference between idler and bushing Standard size Tolerance Standard inter- ference Interference limit Shaft Hole 72 +0.089 +0.059 -0.006 -0.072 0.065 - 0.161 —