TM  10-3930-638-24&P 4-3.   FUEL   SYSTEM   MAINTENANCE   (cont) b. Fuel Injection Pump (cont). STEP LOCATION ITEM ACTION REMARKS DISASSEMBLY   (cont) 8 9 Housing Fuel  injector Position in vise pump and holding with  rear  of  pump fixture tilted slightly downward a. Head locking screw (63)       Remove CAUTION Be careful when performing following step not to drop governor weights. b. Hydraulic head (81) 10 Hydraulic  head a. Six governor (81) weights (82) Remove Grasp with both hands and withdraw using a  slight  rotary  motion Remove Invert hydraulic head and let governor weights  (82),  thrust  sleeve  (83)  and  thrust washer (84) fall into your hand 4-100