TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9–2350–311–10 2–29 Table 2–1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M109 SELF-PROPELLED HOWITZER — CONTINUED Location Item No. Not Fully Mission Capable If: Crewmember Procedure Item to Check/ Service Interval 16 Before Hydraulic Filter Assemblies (M109A4/M109A5) CHIEF OF SECTION Before firing, check bypass indicator (1) on hydrau- lic filter assembly (2). Filters are clean and functioning if red button is flush with bypass indicator. If red button is protruding from bypass indicator, hydraulic filter assemblies are dirty and hydraulic fluid is bypassing them. Hydraulic fluid is bypassing the hydraulic filter assemblies (2). 1 2