To insure that the jaw crusher is ready for operation at all times, it must be inspected systematically, so that defects may be discovered and corrected damage or failure. The necessary preventive maintenance services to be performed are listed and described. The item numbers indicate the sequence of minimum inspection requirements. Defects discovered during operation of the unit will be noted for future correction, to be made as soon as operation has ceased. Stop operation immediately if a deficiency is noted during operation which would damage the equipment if operation were continued. All deficiencies and shortcomings will be recorded together with the corrective action take on DA Form 2404 (Equipment Inspection and Maintenance Worksheet) at the earliest possible opportunity.
Quarterly Preventive Maintenance Services
a. This paragraph contains an illustrated tabulated listing of preventive maintenance services which must be performed by organizational maintenance personnel at quarterly intervals. A quarterly interval is equal to 3 calendar months or 250 hours of operation, which- ever occurs first.
b. The item numbers are listed consecutively and indicate the sequence of minimum requirements. Refer to underneath for the quarterly preventive maintenance services.
1. TIRES. Inspect for cuts, wear and deterioration. Check pressure. Proper pressure is 100 psi.
2. CRUSHER AND DOLLY ELECTRICAL SYSTEM. Check for deteriorated or frayed wiring. Check lights for proper operation. Check motors and junction boxes for cracks, breaks, and excessive noises or vibration during operation.
3. AIR SYSTEM. Check lines and hoses for breaks, leaks, and proper operation. Drain condensation from reservoir and filters. Check brakes for proper adjustment.
4. HYDRAULIC SYSTEM. Check fluid level. See L0. Check for proper operation. Correct all leaks.
5. Main Discharge Conveyor Assembly. Check for cracks, breaks, and proper operation. Check conveyor belt and drive belt for excessive wear, tears, frayed condition, and proper adjustment. Proper adjustment for the drive belt is 1/2 inch deflection midway between pulleys. Inspect the belt scrapers for secure mounting and excessive wear.
6. PAN FEEDER ASSEMBLY. Check for cracks, breaks and proper operation. Check feeder apron for proper adjustment.
7. SCALPER VIBRATING SCREEN ASSEMBLY. Check for cracks, breaks, and proper operation. Check rubber mountings and deflectors for wear and deterioration. Check motor belt for excessive wear or frayed condition and proper adjustment. Proper adjustment is 1/2 inch deflection midway between pulleys.
8. CRUSHER UNIT ASSEMBLY. Check for cracks, breaks, and proper operation. Check drive belts for excessive wear or frayed condition and proper adjustment. Check tension spring for proper tension. Check movable jaw for proper adjustment. Proper adjustment is I-I/2 to 5 Inches between low point in valley on one jaw and high point of ridge on the other.
9. BATTERIES. Check electrolyte level and specific gravity. Tighten loose connections.
10. FUEL TANK. Check for leaks. Check fuel level.
11. FIRE EXTINGUISHER. Inspect for full charge by shaking for sound or by weighing. Check for broken seal.
12. OPERATOR'S ELECTRICAL CONTROL BOX. Inspect for loose connections and proper operation. Check for boroken or damaged switches, relays, and circuit breakers. Inspect for faulty pushbutton switches. Check box to see that it is properly sealed.
13. AIR CLEANER. Check to see if red signal is visible.
14. LUBRICATING SYSTEM. Check engine oil level. Add oil to correct level. Correct lubricant leaks. Lubricate in accordance with current L0.
15. FUEL SYSTEM. Drain water and sediment from fuel filters and check for dirty elements. Every 1000 hours check external fuel pump and governor adjustments. Correct fuel leaks.
16. COOLING SYSTEM. Check coolant level. Fill to 2 Inches below filler neck. Check for correct antifreeze solution. Clean radiator air oassaoes and correct all coolant leaks.
17. FAN BELTS. Check for excessive wear or frayed condition and proper tension. Correct tension Is 3/4 to 1 Inch deflection midway between pulleys.
18. ELECTRICAL SYSTEM. Check starter, generator, and regulator for proper operation. Every 1000 hours check generator brushes. Replace brushes after 1/2 Inch wear. Tighten all loose connections. Replace defective wiring. Proper belt deflection Is 3/4 to I inch.
19. VALVE MECHANISM. Check valves every 1000 hours for proper adjustment. Proper adjustment Is 0.020 Inch for intake valves and 0.024 Inch for exhaust.(HOT)
20. CONTROLS AND INSTRUMENTS. Inspect for loose mounting, loose connections, and proper operation. Normal operating readings for instruments are as follows: Oil pressure gage - 55 to 65 psi. Water temperature gage - 165 to 185 F Ammeter - green range. Tachometer - 1,400 rpm.