Paragraph Page
Number Title Number
4-4 General ... 4-3 4-5 Intervals ... 4-3 4-6 Reporting Repairs ... 4-3 4-7 General PMCS Procedures ... 4-3 4-8 Specific PMCS Procedures ... 4-4 Table 4-1 Organizational Preventive Maintenance Checks and Services (PMCS)... 4-5 4-4. GENERAL.
The 250 CFM Trailer-Mounted Compressor Unit must reinspected on a regular basis so that defects are found before they result unserious damage, failure, or injury to personnel. This section, Preventive Maintenance Checks and Services (PMCS), contains systematic instructions on inspections, adjustments, and corrections to be performed by organizational maintenance.
4-5. INTERVALS.
Organizational maintenance shall perform PMCS, found in Table 4-1, at the following intervals:
(1) Quarterly (Q), once every three months.
(2) Semiannually (S), once every six months.
(3) Hours (H), after the prescribed number of hours of operation.
4-6. REPORTING REPAIRS.
All defects shall be reported on DA Form 2404, Equipment Inspection and Maintenance Worksheet, immediately after completing PMCS and before taking corrective action. These defects shall also be reported in the equipment log.
4-7. GENERAL PMCS PROCEDURES.
a. While performing specific PMCS procedures, ensure that items are correctly assembled, secure, serviceable, adequately lubricated, and not worn or leaking as defined below:
(1) An item is CORRECTLY ASSEMBLED when it is in proper position and all parts are present.
(2) Wires, nuts, hoses, fittings, or attaching hardware are SECURE when they cannot be easily removed by hand or by wrench.
(3) An item is SERVICEABLE if it is not worn beyond repair or likely to fail before the next scheduled inspection.
(4) An item is ADEQUATELY LUBRICATED if it has been lubricated in accordance with Chapter 3, Section I.
(5) An item is WORN if there is too much play between joining parts, if item does not meet wear specifications provided, or when warning, caution, and data stencil markings, plates, or decals are not legible.
4-7. GENERAL PMCS PROCEDURES (Con't).
(6) For a classification of LEAKAGE, see paragraph 2-9.
b. Perform inspections of welds, electrical conduits, tubing, and hoses as described below:
(1) Check for loose or chipped paint, rust, or gaps where parts are welded together, If a bad weld is found, notify your supervisor.
(2) Look for cracked, frayed, loose, or broken electrical conduits, tubing, and hoses. Tighten all loose components. Repair or report unserviceable items.
(3) Check for wear, damage, and leaks, and ensure that couplings and fittings are tight. Wet spots indicate leaks, but a stain around a coupling or fitting can also mean a leak. If a leak comes from a loose coupling or fitting, tighten it. Repair or report unserviceable items.
c. Where the instruction "tighten" appears in a procedure, tighten the item to the given value even if the item appears secure. If no torque value is given, refer to Appendix F.
d. Where the instruction "clean" appears in a procedure, use guidelines found in paragraph 2-8. Even if a procedure does not specify cleaning, be aware of any buildup of dirt, grease, oil, and debris. Clean any such buildups using cleaning agents authorized in Appendix E. Lubricate as required (see Chapter 3, Section I).
4-8. SPECIFIC PMCS PROCEDURES.
a. Organizational" PMCS are provided in Table 4-1. Always perform PMCS in the order listed. Once it becomes a habit, anything that is not right can be spotted in a minute. If anything wrong is discovered through PMCS, perform the appropriate troubleshooting task in Section IV of this chapter. If any component or system is not serviceable, or if the given service does not correct the problem, notify your supervisor.
b. The PMCS procedures in Table 4-1 are performed at three intervals: Quarterly, Semiannually, and Hours, Before performing preventive maintenance, read all checks required for the applicable interval and prepare tools needed to make inspections in the order listed within the designated interval.
c. The columns in PMCS table are defined as follows:
(1) Item No. Provides a logical sequence for PMCS to be performed and is used as a source number when filling out DA Form 2404.
(2) Interval. Specifies interval at which PMCS is to be performed.
(3) Item To Be Inspected. Lists system and common names of items that are to be inspected.
(4) Procedures. Lists the specific servicing, inspection, replacement, or adjustment procedures to be followed.
4-4
Table 4-1. Organizational Preventive Maintenance Checks and Services (PMCS).
Q-Quarterly M - Monthly H-Hours
INTERVAL
ITEM ITEM TO BE INSPECTED. PROCEDURES
NO. Q S H
WARNING
The compressor lubricating/cooling system is un-der pressure. To prevent injury, do not, unun-der any circumstance, remove drain plug or filler plug from the compressor lubricating/cooling system while under pressure. Open the manual blowdown valve as a safety precaution first.
NOTE
Perform all Operator PMCS first.
WARRANTY REQUIREMENTS (One Time Service)
50 a. After first 50 hours of operation, change engine and
compressor oil filters.
50 b. Check valve clearance (see paragraph 4-13).
150 c. After first 150 hours of operation, change engine oil, oil filter and compressor oil filter. After warranty requirements have been met, the engine oil and filter are changed in
accordance with the Army Oil Analysis Program (AOAP) (see LO 5-4310-452-12).
2 COOLING FINS
250 Clean and inspect the engine cooling fins (see paragraph 3-5).
3 DRIVE BELTS
250 a. Visually check belts for cracks or deterioration. If belts are cracked or deteriorated, replace belts (see paragraph 4-33, 4-37, or 4-91).
250 b. Check alternator belt for deflection by pressing down on belt and measuring deflection. If belt deflects more than 0.4-0.6 in. (10-15 mm) adjust belt (see paragraph 4-37).
250 c. Check belt break switch (see paragraph 4-42) and all
warning devices for function (see paragraph 4-55).
Table 4-1. Organizational Preventive Maintenance Checks and Semites (PMCS) (Con't).
Q-Quarterly M - Monthly H-Hours
INTERVAL
ITEM ITEM TO BE INSPECTED. PROCEDURES
NO. Q S H
4 COMPRESSOR
WARNING
The compressor lubricating/cooling system is un-der pressure, To prevent injury, do not, unun-der any circumstance, remove drain plug or filler plug from the compressor lubricating/cooling system while under pressure. Open the manual blowdown valve as a safety precaution first.
250 a. Inspect all lines, hoses, and fittings for leaks or damaged parts. Drain compressor oil, replace oil filter, and service oil (see paragraph 4-84 and LO 5-4310-452-12).
250 b. Clean cooling fan (see paragraph 4-92).
5 FUEL SYSTEM
250 a. Replace fuel filter (see paragraph 4-26).
250 b. Clean fuel strainer in metering fuel pump (see paragraph
4-22).
250 c. Replace filter element in fuel/water separator (see
paragraph 4-27).
250 d. Inspect all fuel lines and hoses for damage or leaks.
6 VALVE
CLEARANCE
500 Adjust valve clearance (see paragraph 4-13).
7 OIL SEPARATOR
500 Replace element in oil separator (see paragraph 4-87).
8 BRAKES
4000 Adjust brakes (see paragraph 4-65).
9 WHEEL
BEARINGS
4000 Clean and repack wheel bearings (see LO 5-4310-452-12).
4-6
Table 4-1. Organizational Preventive Maintenance Checks and Services (PMCS) (Con't).
Q - Quarterly S - Semiannual H - Hours
INTERVAL
ITEM ITEM TO BE INSPECTED PROCEDURES
NO. Q S H
10 AIR SILENCER
• Remove, clean, and inspect air silencer (see paragraph 4-94).
11 DRAWBAR
• Check drawbar mounting bolts for proper torque of
180-200 lb. -ft (244-271 N*m).