Komatsu 140-3 Series Shop Manual page 349

DISASSEMBLY AND ASSEMBLY
Procedure for installing standard seal
Before installing the seal, make sure that the end
corners and lip sliding surfaces of the crankshaft
and housing are free from flaw, burr, fin, and rust.
When installing the seal, do not apply oil or
grease to the shaft and seal lip. Wipe off the oil
from the shaft.
Never remove the inside plastic cylinder of the
standard spare seal before installing the seal.
1) Bring the large inside diameter side of plastic
inside cylinder (3) to the end of crankshaft (4).
Take care not to mistake the direction of the
plastic inside cylinder.
140-3 SERIES
GENERAL ASSEMBLY OF ENGINE
2) Hold the metal ring of seal (1) with both hands
and push it in firmly.
3) After pushing in the seal, remove plastic inside
cylinder (3).
When removing the inside cylinder, extreme-
ly take care not to damage the seal lip.
4) Tighten the 3 bolts evenly to press fit seal (1)
until the end of tool N1 reaches the end of
crankshaft (4).
First, tighten tool N1 until bolt N3 (45 mm)
stops, then tighten N4 (25 mm).
When press fitting the seal, take care not to
damage the lip on the PTO side with the tool
set, etc.
After press fitting the seal, remove the red
sealant layer from its periphery.
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