a. General. Your PMCS table (table 2-1) has been provided so you can keep your equipment in good operating condition and ready for its primary mission.
b. Warnings and cautions. Always observe the WARNINGS and CAUTIONS appearing in your PMCS table BEFORE, DURING, and AFTER you operate the equipment. The warnings and cautions appear before applicable procedures. You must observe these WARNINGS and CAUTIONS to pre- vent serious injury to yourself and others or to prevent your equipment from being damaged.
c. Explanation of table entries.
(1) Item number column. Numbers in this column are for reference. When completing DA Form 2404, Equipment Inspection and Maintenance Worksheet, include the item number for the check/service indicating a fault. Item numbers also appear in the order in which checks and services must be performed for the intervals listed.
(2) Interval column. This column tells you when you must do the procedure in the procedure column. BEFORE procedures must be done before you operate or use the equipment for its intended mission. DURING procedures must be done during the time you are operating or using the equipment for its intended mission. AFTER procedures must be done immediately after you have operated or used the equipment. When a check and service procedure is required for both weekly and before intervals, it is not necessary to do the procedure twice if the equipment is operated during the weekly period.
(3) Location, check/service column. This column provides the location and the item to be checked or serviced. The item location is underlined.
(4) Procedure column. This column gives the procedure you must do to check or service the item listed in the check/service column to know if the equipment is ready or available for its intended mission or for operation. You must do the procedure at the time stated in the interval column.
(5) Not fully mission capable if: column. Information in this column tells you what faults will keep your equipment from being capable of performing its primary mission. If you make check and service procedures that show faults listed in this column, do not operate the equipment. Follow standard operating procedures for maintaining the equipment or reporting equipment failure.
d. Other table entries. Be sure to observe all special information and notes that appear in your table.
2-9. INTRODUCTION TO PMCS TABLE (cont)
e. leakage classification and definitions. Fluid leakage for operator/crew PMCS is classified and defined as follows:
(1) Class I. Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.
(2) Class II. Leakage of fluid great enough to form drops but not enough to cause drops to drip from item being checked.
(3) Class III Leakage of fluid great enough to cause drops to drip from the item being checked. NOTE
Fluid levels of items with Class I or Class II leaks must be checked often so proper levels can be kept.
Class Ill leaks must be reported to your supervisor or Unit maintenance for corrective action. 2-10. PMCS PROCEDURES
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M10A1 HOWITZER
Location Item to
Item Check Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
1 Before CANNON Crewmember 1
Before fire mission, be sure bore Cannon contains and chamber are dry; check for cracks, dents, or obstructions, dents, stripped bulges.
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
2 Before RECOILMECHANISM Chief of Section
a. Check for evidence of oil Oil index is not leakage at stuffing box head flush with recup- (1), purge plug (2), machine erator.
plug (3), oil index (4), and respirator (5).
b. Check for proper oil reserve. Full reserve of oil is indicated when oil index (4) is flush with face of recuperator cylinder front head assembly (6).
2-10. PMCS PROCEDURES (cont)
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M1 M101 A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
2 Before RECOIL MECH- Chief of Section
ANISM (cont)
c. If oil index (4) is below face, add OHT (item 14, appx E). Remove machine plug (3) above oil index (4) and carefully screw oil gun (7) into filling hole (8). Tighten oil gun (7) into filling hole (8). Using both hands, turn handle of oil gun (7) to force oil into recoil mechanism. When oil index (4) is flush with face of recuperator cylinder front head assembly (6), indicating full reserve, unscrew oil gun (7). Install machine plug (3).
2-10. PMCS PROCEDURES (cont)
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
d. Be sure that castellated Castellated nut nut (9) is in place and not in place secured with cotter pin or secured (10). Check respirator (5) with cotter pin. for proper setting by turning
respirator valve head clock- wise or counterclockwise with respirator wrench to adjust properly. Set respirator at 0 for traveling; 1 for normal low angle firing; 2 for sustained high angle firing; or 3 for minimum buffing action. e. Check slides for burrs,
scoring, corrosion, and other damage. Check for oil leakage. If loss of fluid requires replenishment of entire reserve during a normal day’s firing, notify Unit maintenance.
2-10. PMCS PROCEDURES (cont)
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
3 During RECOIL MECHANISM Chief of Section
a. Check for evidence of oil Oil index is not leakage at stuffing box head flush with recu- (1), purge plug (2), machine perator. plug (3), oil index (4), and
respirator (5).
b. Check for proper oil reserve. Full reserve of oil is indicated when oil index is flush with face of recuperator cylinder front head assembly (6).
2-10. PMCS PROCEDURES (cont)
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
c. If oil index (4) is below face, add OHT (item 14, appx E). Remove machine plug (3) above oil index (4) and carefully screw oil gun (7) into filling hole (8). Tighten oil gun (7) into filling hole (8). Using both hands, turn handle of oil gun (7) to force oil into recoil mechanism. When oil index (4) is flush with face of recuperator cylinder front head assembly (6), indicating full reserve, unscrew oil gun (7). Install machine plug (3).
2-10.PMCS PROCEDURES (cont)
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
3 During RECOIL MECHANISM Chief of Section
(cont)
d. Be sure that castellated nut (9) is in place and secured with cotter pin (10). Check respirator (5) for proper setting by turning respirator valve head clockwise or counterclockwise with respi- rator wrench to adjust prop- erly. Set respirator at 0 for traveling; 1 for normal low angle firing; 2 for sustained high angle firing; or 3 for minimum buffing action. e. Check slides for burrs,
scoring, corrosion, and other damage. Check for oil leakage. If loss of fluid requires replenishment of entire reserve during a normal day’s firing, notify Unit maintenance.
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
4 During TIRES Crewmember 2
Check tire tread (1) by pinching One or both tires with thumb and index finger. are unserviceable. Notify Unit maintenance if thumb
and index finger keep slipping off.
5 After DA FORM 2408-4 Chief of Section
Enter day’s firing and update Total EFC count
EFC total. exceeds 7500
rounds.
6 After BREECH MECH- Chief of Section
ANISM
a. Immediately after firing, disassemble breech mech- anism.
NOTE
CLP (item 7, appx E) is main lubricant for oil can points and after cleaning. b. Clean all parts with wiping
rag (item 25, appx E) and CLP (item 7, appx E); wipe dry with a clean wiping rag (item 25, appx E). Inspect for damaged or worn parts,
2-10. PMCS PROCEDURES (cont)
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
7 After RECOIL MECHANISM Chief of Section (cont)
a Check for evidence of oil Oil index is not leakage at stuffing box head flush with recup- (1), purge plug (2), machine erator.
plug (3), oil index (4), and respirator (5).
b. Check for proper oil reserve. Full reserve of oil is indicated when oil index (4) is flush with face of recuperator cylinder front head assembly (6).
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
c. If oill index (4) is below face, add OHT (item 14, appx E). Remove machine plug (3) above oil index (4) and carefully screw oil gun (7) into filling hole (8). Tighten oil gun (7) into filling hole (8). Using both hands, turn handle of oil gun (7) to force oil into recoil mechanism. When oil index (4) is flush with face of recuperator cylinder front head assembly (6), indicating full reserve, unscrew oil gun (7). Install machine plug (3).
2-10. PMCS PROCEDURES (cont)
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
7 After RECOIL MECHANISM Chief of Section (cont)
d. Be sure that castellated nut (9) is in place and secured with cotter pin (10). Check respirator (5) for proper setting by turning respirator valve head clockwise or counter-. clockwise with respirator wrench to adjust properly. Set respirator at 0 for traveling; 1 for normal low angle firing; 2 for sustained high angle firing; or 3 for minimum buffing action.
Table 2-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES FOR M101A1 HOWITZER (cont)
Location Item to
Item Check/ Crewmember Not Fully Mission
No. Interval Service Procedure Capable If:
e. Check slides for burrs, scoring, corrosion, and other damage. Check for oil leakage. If loss of fluid requires replenishment of entire reserve during a normal day’s firing, notify Unit maintenance.
8 After CANNON Chief of Section
CAUTION