Komatsu 4D98 Series Shop Manual page 91

7. Fuel Injection System/Governor
(6.4)
Delivery valve
Mainly check for surface defect, corro-
sion and wear mainly at the piston.
(6.5) Check mainly the control rack for
bend, the pinion for wear and dam-
age at the gear portion, and the
sleeve for wear at the contact face
with the plunger collar portion.
Rack, pinion and sleeve
(6.6) Tappet
Check mainly for wear and damage at
the pin hole, roller, pin and bushing.
Tappet
(6.7) Camshaft
Check mainly the cam surface for dam-
age and wear, the key groove and
thread for deformation, and the shaft for
bend.
(6.8) Bearing
Check mainly the roller bearing for
wear, and the outer race for surface de-
fect.
(6.9) Plunger spring
lower retainer
Check mainly the portion in contact with
the plunger for deformation and wear.
Camshaft
4%
Plunger spring lower retainer
1
7-6