Hitachi EX20UR-2 Manual page 373

Bearing unit
Meeting a hole in the bearing unit with a hole in the
body, lock the bearing unit with a setscrew.
Seal unit
Impeller
Apply the bond to the face where the unit contacts the
body.
•
Clearance, play and tightening allowance between
parts
(1) Clearance between pump impeller and body
Standard
0.026 — 0.061
ENGINE/Cooling system
REASSEMBLY
(mm)
Standard Repair method
0.3 — 0.9
Repair or replace if impeller contacts body
(2) Play in water pump ball bearing
(mm)
Standard Limit
Repair method
0.008 — 0.010 over 0.2 Replace
(3) Tightening allowance of fan center and bearing
shaft
(mm)
W05-04-03