TM 5-4310-386-14 Table 4-1.  Unit Preventive Maintenance Checks and Services (PMCS). W - Weekly M - Monthly S - Semiannually H - Hourly Interval Item No. W M S H Item to be Inspected Procedures 8 * Purification cartridges Inspect cartridges for cracks, loose, damaged, or missing parts.  Notify your supervisor for cartridge replacement. Temperature Hours Between Temperature Hours Between F°/C° Replacement F°/C° Replacement 122/49 15 68/20 75 115/46 19 65/18 86 110/43 22 60/15 104 105/40 24 55/13 117 100/37 29 50/10 135 95/35 32 45/7 172 80/32 38 40/4 201 75/24 60 35/2 234 70/21 73 32/0 285 * Refer to table above for hours of operation between purification cartridge replacement.  Identify the closest temperature to the temperature at which the equipment has been operated in and compare the hours of operation against the value in the table.  Take in consideration all hours the equipment was operated above or below that temperature. 9 Compressor drive belt Inspect drive belt for wear, fraying, peeling, cracking, and tension.  Replace and adjust belt as needed (para. 4-25). 10 Engine Inspect Inspect for cracks, loose, damaged, or missing parts. 250   Service Service engine.  Refer to para. 4-29. 4-14