Hitachi EX20UR-2 Manual page 64

LI]
Oil Seal Mount
Surface
W507-02-04-010
3. Wear amount of the shaft oil seal mount surface:
The surface must be free from scratches or abnor-
mal wear.
Wear amount must be 0.025 mm or less.
MAINTENANCE STANDARDS
(EX3OUR-2, EX4OUR-2)
Main Pump
1. Clearance between cylinder block bore and plung-
er:
(D-d) must be 0.5 mm or less.
Cylinder
Block
Plunger
W507-02-04-009
2. Clearance between plunger tip and shoe bottom:
Delta must be 0.2 mm or less.
W107-02-06-140
W107-02-06-141
UPPERSTRUCTURE / Pump Device
W02-03-31