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TM 9-2910-226-34
(4) With plunger stationary, check backlash of
c. Assembly. Refer to figure 3-103 and reverse the
drive gear. Backlash must not exceed 0.025-inch.
sequence of instructions to assemble the tappet
(5) Refer to figure 3-102. Position plunger sleeve
assembly.
to expose plunger spill and fill ports. Using a
3-30. Repair of Quill Shaft Assembly.
magnifying glass inspect the spill port and plunger
NOTE
for evidence of erosion, wear patterns, nicks, burs or
Components of the quill shaft assembly are
scratches. If errosion is evident it will appear as
not spare parts; do not disassemble.
nibbling around around the fill and spill ports. If any
a. Refer to figure 3-104. Check end play clearance
damage is evident, it is necessary to replace the
between quill shaft gear and shaft spacer. Clearance
complete head assembly.
shaft spacer. Clearance should be 0.001 to 0.006
c. Assembly. Refer to figure 3-100. Lubricate and
inches. Inspect gears for chipped, cracked or broken
install new hydraulic head upper and lower
gear teeth.
preformed packings (A) and (B).
b. Inspect tapped hole for stripped or damaged
3-29. Repair of Tappet Assembly. a. Disassembly.
threads. Repair threads with suitable tap if possible.
Refer to figure 3-103. Remove tappet roller pin (C)
c. If threads are stripped, end play is excessive, or
and tappet roller assembly (A) from tappet guide
gears are damaged, replace complete assembly.
(B).
Figure 3-103. Disassembling or assembling tappet assembly.
b. Inspection. Inspect the tappet assembly as
Figure 3-104. Inspection of quill shaft assembly.
follows:
3-31. Repair  of Camshaft Assembly.  a. Dis-
(1) Inspect the tappet guide (B) for evidence of
assembly.  Disassemble camshaft assembly as
wear patterns.
follows:
(2) Check the inside and outside diameter of
(1) Refer to figure 3-105. Place camshaft and
tappet roller assembly (A) and outside diameter of
associated parts in a vise as shown. Straighten tabs
tappet roller pin (C), and the plunger outer spring
on bearing retaining lockwasher (A) and remove
(T, fig. 3-109) against the limits specified in the
bearing retaining locknut (B), using wrench5120-
repair standards (para 3-60 and 3-61).
870-6926. Remove lockwasher.
(3) Replace the tappet assembly or spring when
they do not meet these requirements.
3-64

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