TM-9-2350-277-20-4 Unit Maintenance Manual Volume 4 M113A3 M577A3 M1064A3 M1068A3 M58 Download
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TM 9-2350-277-20-4 REPLACE COMMANDER’S CUPOLA VISION BLOCK LOCKS AND SEALS (M1064A3 ONLY) — Continued 0491 00 1. Remove thumbscrew (1) and spring (2) from periscope clamp (3). 2. Remove bolt (4), washer (5), and periscope clamp (3) from post (6). 3. Remove post (6) and washer (7) from cupola. 4. Scrape seal (8) from vision block opening. 0491 00-2