4. 3. Dismantling
4. 3. 1. Dismantling Procedure
Refer to paragraph. 3.2 for the pump dismantling procedure. The mechanical seal shall be dismantled from one
side and then to other side. The dismantling sequence hereunder is subject to completion of dismantling the bearing
housing unit.
(1) Unscrew off hexagon socket head bolts and then remove seal cover (4710) from the casing.
(2) Seat (4750) is inserted in the seal cover through O-ring (4120.3). Therefore, it can be taken out only by
pushing it strongly by hand.
(3) Pull out the rotating parts of mechanical seal from seal sleeve (5240). At this time, the spacer sleeve
(5251.2) may be pulled out in advance to prevent washer (4720) from contacting the spacer sleeve
(5251).
4. 3. 2. Inspection and adjustment of dismantled parts.
(1) Inspect the wear state of the sliding surface of the seal.
(2) As a rule, the mechanical seal once used, must be replaced with new one irrespective of the running
hours. However, stopper (4740), back-up ring (4724) and spring (4770) are available for further re-use
unless they are flawed. In addition, if the wear degree of seat (4750) and washer (4720) is small, these
parts also are available for further re-use by lapping-repair.
(3) Inspect the presence or non-presence of flaw on the portion of seal sleeve (5240) to insert the O-ring
(4120.4).
(4) Check the presence or non-presence of flaw on the contact surface of seal cover (4710) and the seat
(4750).
(5) After the above inspection, clean adequately each part in washing oil.
4. 4. Reassembling
(
1) Insert O-ring (4120.3) in Fig. 8 in the seal cover after thin oil coating (turbine oil or machine oil) was applied
thereto. Then, apply same oil coating to the peripheral surface of the seat and insert it in the seal cover,
with its lapped surface upside. At this time, pay special attention to the positions of the notch for seat
locking and lock pin (5600). After insertion, check for inclination of the seat.
4750
4710
4120.1
Fig. 8
(2) After inserting back-up ring ( 4724 ), O-ring ( 4120.4 ) and stopper ( 4740 ) in washer ( 4720 ), insert the
projected portion of the spring ( 4770 ) into the notched hole of the washer. In this case, pay special care
to the following.
