TM 55-2210-224-12 Table 4-1.  Unit Preventive Maintenance Checks and Services (continued) W - Weekly M - Monthly Q - Quarterly Interval Item Item to be No. W M Q Inspected Procedures 37 Windshield a.  Check windshield wiper motor for proper Wiper Motors, operation. Arms, and Blades b.  Check wiper blades for damage and wear. c.  Check wiper arms for looseness and damage. 38 Window Glass Check window glass for cracks and breaks. and Sash Check sash for damage.  Check for security of mounting. 39 Cab Doors and Check doors for breaks and damage.  Check Locks locks for ease of operation.  Check doors for secure closing.  Service in accordance with LO 55-2210-224-12. 40 Electrical Equip- Check doors for breaks and damage.  Check ment Cabinet handle for ease of operation.  Service in Doors accordance with LO 55-2210-224-12. 41 Electrical a.  Check for proper operation of switches Switches, Circuit and circuit breakers. Breakers, and Indicating Lights b.  Check indicating lights for cracked lens.  Check for proper operation. 42 Transisition Inspect panel and card wiring for cracks, Relay Panel breaks, and damaged insulation.  Check that all wire connections on panel are tight. 43 Speed-sensing Clean off outside of alternator and inspect Alternator leads and connections, where they exit terminal box, to see that they are not damaged. 44 · Pressure Switches Inspect switches and wiring for loose mounting, damaged insulation and loose connections. Inspect capillary tube for chafing, bends, kinks and loose fittings. 45 Electrical Inspect for loose connections, contact Relays and burning, and charring of relay coil and Contactors insulation. 46 Timer Use multimeter and check timer for proper operation. 4-9