Komatsu 4D98 Series Shop Manual page 64

4. Engine Body
(6) Oil seal replacement
@ Replace the oil seal with a new one when the gear case is disassembled.
Extract the used oilseal.
@ Insert a new oil seal using the oil seal inserting tool.
@ Apply lithium grease.
(7) Camshaft bushing replacement
Replace the bushing using the special service tool (see 11 -1-7 in Chapter 11).
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