TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 68 of 1275
TM 9-2350-311-20-1
SECTION IV. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
2-14 GENERAL
This section contains unit PMCS. Preventive maintenance is the step-by-step care, inspection, and service of equipment
to maintain it in good condition and to find problems before extensive and time-consuming repairs or replacements are
needed. Refer to DA PAM 738-750 for instructions on use of forms for PMCS.
2-14.1 Intervals
The PMCS listed in Table 2-1 are to be performed at organizational level at intevals determined by whichever comes
first: (a) semiannually, 1500 miles (2539 km), or 150 hours; (b) annually, 3000 miles (4828 km), or 300 hours.
PMCS items and intevals have been determined by using Reliability Centered Maintenance (RCM) logic and are to be
scheduled on DD Form314 in accordance with DA PAM 738-750.
After operation in water, mud, and loose sand, the vehicle should be cleaned as soon as possible. Lubricate without
waiting for the next scheduled service.
2-14.2 Lubrication
Paragraph 2-15 has detailed lubrication steps and instructions covering locations, intervals, and lubricants for M109A2/
M109A3/M109A4/M109A5 Howitzers. The crew will assist the unit maintenance personnel in lubricating the vehicle.
2-14.3 Procedures
2-14.3.1 Routine applications — TM 9-2350-311-10 contains maintenance instructions that the unit mechanic must use
to perform his duties.
2-14.3.2 Crew participation — The crew will accompany the vehicle and help the unit mechanics perform unit services.
Do not direct a stream of water or steam against the opening between the hull and cab
(cab race ring), grilles exhaust deflectors, fire control, or armament openings.
2-14.3.3 Vehicle cleanliness — The crew should bring a clean vehicle to a scheduled PMCS. It should be dry and not
caked with mud. Washing the vehicle should not be done just before an inspection. Some defects, such as loose parts
and oil leaks, may not be noticed immediately after washing.
2-14.4 Services
Unit services are defined by, and limited to, the following general procedures. Approval to perform higher category
services must be given by the supporting maintenance unit.
2-14.4.1 Adjustment — Make all needed adjustments using instructions in this manual and technical bulletins.
2-14.4.2 Cleaning — Clean the vehicle to remove old lubricant, dirt, and other foreign matter. Special cleaning
instructions are given as needed.
2-20
CAUTION
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