(3) Take good care not to damage each O-ring and the sealed contact surface of each parts.
(4) When replacing the rotating assembly ( shaft, impeller, sleeve ), determine the dimension ( Y-X ) of the
casing side spacer ring in the discharge side bearing housing in accordance with the procedure shown in
Fig. 6. In this case, move reciprocally the rotating assembly from the discharge side to the suction side and
vice-versally and determine the dimension of spacer ring based on the center position of the rotating
assembly.
Fig. 6 Correctly sized spacer ring
(5) Follow the table below for the tie bolt tightening torque.
( Unit : kgf )
Pump Size
32
40
50
65
Tie bolt tightening torque
7
8
10
10
Table 2. Torque tightening tie bolt.
(6) After the reassembling work, check the condition of the coupling set in the procedure given in Para. 1. 2 and
start the pump pursuant to Para. 2. 1.
3. 4. Bearing
(1) Bearing spesification – Single row deep groove ball bearing.
Pump Size
32
40
50
65
Bearing No.
6305C
3
6306C
3
6307C
3
Table 3. Bearing No.
Further, the bearing used are of contact rubber sealed type.
Example : Makers NSK DDUC3
NTN LLUC3/2A
KOYO 2RS
(2) Bearing replacement interval.
Replace the bearing with new ones either every about 5000 running hours or every two year’s running.
