TM 9-2910-226-34 Figure 3-99. Identification of hydraulic head assembly HD9070A (2910-084-0259). a. Disassembly. Refer to figure 3-100. Remove and discard hydraulic head lower preformed packing (A) and upper preformed packing (B). Do not remove fuel inlet fitting. 3-62 Figure 3-100. Removing or installing hydraulic head packings. b. Inspection. Inspect the hydraulic head assembly as follows: (1) Refer to figure 3-101. Examine plunger button (A) and spring (B) for evidence of wear. Check spring coils for breaks, cracks or distortion. Check gear teeth (C) for wear patterns and chipped or broken teeth. Figure 3-101. Inspection of hydraulic head components.