TM 9-2910-226-34 (4) With plunger stationary, check backlash of drive gear. Backlash must not exceed 0.025-inch. (5) Refer to figure 3-102. Position plunger sleeve to expose plunger spill and fill ports. Using a magnifying glass inspect the spill port and plunger for evidence of erosion, wear patterns, nicks, burs or scratches. If errosion is evident it will appear as nibbling around around the fill and spill ports. If any damage is evident, it is necessary to replace the complete head assembly. c. Assembly. Refer to figure 3-100. Lubricate and install new hydraulic head upper and lower preformed packings (A) and (B). 3-29. Repair of Tappet Assembly. a. Disassembly. Refer to figure 3-103. Remove tappet roller pin (C) and tappet roller assembly (A) from tappet guide (B). Figure 3-103. Disassembling or assembling tappet assembly. b. Inspection. Inspect the tappet assembly as follows: (1) Inspect the tappet guide (B) for evidence of wear patterns. (2) Check the inside and outside diameter of tappet roller assembly (A) and outside diameter of tappet roller pin (C), and the plunger outer spring (T, fig. 3-109) against the limits specified in the repair standards (para 3-60 and 3-61). (3) Replace the tappet assembly or they do not meet these requirements. spring when c. Assembly. Refer to figure 3-103 and reverse the sequence of instructions to assemble the tappet assembly. 3-30. Repair of Quill Shaft Assembly. NOTE Components of the quill shaft assembly are not spare parts; do not disassemble. a. Refer to figure 3-104. Check end play clearance between quill shaft gear and shaft spacer. Clearance shaft spacer. Clearance should be 0.001 to 0.006 inches. Inspect gears for chipped, cracked or broken gear teeth. b. Inspect tapped hole for stripped or damaged threads. Repair threads with suitable tap if possible. c. If threads are stripped, end play is excessive, or gears are damaged, replace complete assembly. Figure 3-104. Inspection of quill shaft assembly. 3-31. Repair of Camshaft Assembly. a. Dis- assembly. Disassemble camshaft assembly as follows: (1) Refer to figure 3-105. Place camshaft and associated parts in a vise as shown. Straighten tabs on bearing retaining lockwasher (A) and remove bearing retaining locknut (B), using wrench–5120- 870-6926. Remove lockwasher. 3-64