TM 9-2320-361-34 13-4. FIFTH WHEEL MAINTENANCE (Contd) I b. Cleaning and Inspection I 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 13-16 For general cleaning instructions, refer to para 2-8. Inspect two coupler jaws (12) for cracks and breaks. Replace if cracked or broken. Inspect cam (10) for grooves and breaks. Replace if grooved or broken. Inspect springs (2), (5), (11), and (13) for bends, breaks, and collapsed coils. Measure spring lengths. Refer to table 13-1, Fifth Wheel Spring Length, for measurements. Replace if bent, broken, or coils are collapsed. Inspect pinion gear (6) for damaged gear teeth. Replace if damaged. Inspect plunger rack (3) for cracks and breaks. Replace if cracked or broken. Inspect handle (1) for bends and cracks. Replace if bent or cracked. Inspect fifth wheel housing surface (8) for grooves, gouges, and breaks in metal. Replace if damaged or broken. Inspect plunger rack latch (4) for bends and scoring. Replace if bent or scored. Inspect stud (7) for breaks, cracks, and stripped threads. Replace if damaged. Inspect bushings (15) for cuts, wear, or damage. Replace if damaged. Inspect compression arm (14) for cracks, breaks, and bends. Replace if cracked, broken, or bent. Inspect plunger rack (3), pivot pin (9), and cam (10) for wear. Measure plunger rack (3), pivot pin (9), and cam (10). Refer to table 13-2, Fifth Wheel Wear Limits, for measurements. Replace if worn. Table 13-1. Fifth Wheel Spring Length. ITEM SPRING FREE LENGTH NO. lTEM/POINT OF MEASUREMENT INCHES MILLIMETERS 2 Plunger rack spring 7.25 184.15 5 Plunger rack latch spring 2.06 52.32 11 Handle spring 6.00 152.4 13 Coupler jaw spring 2.31 58.67 Table 13-2. Fifih Wheel Wear Limits. ITEM lTEM/POINT OF MEASUREMENT WEAR LIMITS/TOLERANCES NO. INCHES MILLIMETERS 3 Plunger rack, outer diameter 2.874-2.878 72.999-73.101 9 Pivot pin Outer diameter 1.47 -1.53 37.34-38.86 Length 6.44-6.59 163.57-167.38 10 Cam, inner diameter 1.093-1.099 27.76-27.91