TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 1–18 1–15 DIFFERENCES BETWEEN MODELS — CONTINUED Functional group and part Number of Variations How assemblies/parts differ 02 Mount, howitzer 2 M109A2/M109A3/M109A4 howit- zers have M178 mount. M109A5 howitzers have M182 mount. Mounts are similar in maintenance characteristics, although there are subtle differences in parts. Refer to TM 9–2350–311–24P–2 for specific part number changes. An access plate has been added to the cradle of M109A5 howitzers. 03 Cab hydraulics 2 M109A4/M109A5 howitzers have a hydroscopic breather and an air line filter. Clutch valve and attaching hoses have been added to M109A4/M109A5 howitzers. 03 Power pack assembly 2 M109A4/M109A5 howitzers have eliminated internal hydraulic filter of M109A2 and M109A3 howitzers, re- placing it with two external filters. 05 Power lead assembly 2 Number of leads is 3 or 5 depending on number of contact arm assem- blies in vehicle. An additional lead for NBC control box was added to M109A4/M109A5 howitzers. 05 NBC power lead assembly 2 M109A4/M109A5 howitzers have an NBC power lead assembly. 05 Power relay box to intercom power supply 2 Number of leads differs. One har- lead assembly ness used for vehicles with 5 con- tact arm assemblies; other harness used for vehicles with 3 contact arm assemblies. 06 Contact arm assemblies 2 Some M109A3 vehicles have 3 and some vehicles have 5 contact arm assemblies (slip ring brush holders). M109A2/M109A4/M109A5 vehicles have 5 contact arm assemblies.