Hitachi NEXT Series Service Manual page 38

■ Oil Pump Model
Air-Cooled
Fix speed type 50Hz : TOP-N340FAM
Fix speed type 60Hz/ Vtype : TOP-N330FAM
Water-Cooled
ALL : TOP-N320FA
■ Replacement Parts
When re-assembling, the parts shown in Table
1 must be replaced with new ones.
Table 1 Oil pump replacement parts list
Oil seal
31506931
A : 2.05inch(52mm)
B : 0.31inch(8mm)
O-Ring
33211090
A : 3.79inch(96.2mm)
B : 0.12inch(3.1mm)
Ball bearing
28015931 × 2
A : 2.05inch(52mm)
B : 0.59inch(15mm)
Needle bearing
28015980
A : 0.91inch(23mm)
B : 0.98inch(25mm)
36
Confidential to Customer
■ Tool
Fig. 1 Oil pump gear removing tool
Fig. 2 Bearing/oil seal driving tool