Repair of Tappet Assembly

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