CAL Optional Design
- 19-
(4)
The seats (4750.1 and 4750.2) have been simply inserted in
the seal cover and the casing cover with the O-rings
(4120.1 and 4120.2) respectively. They can be removed by
pulling them out forcedly with both hands.
5.5. Inspection and maintenance of disassembled
parts
(1)
Check the casing cover (1610) for adhesion of internal
scale, and remove rust and scale.
(2)
Check the O-ring (4120) or the cushion ring (4101)
insertion part of the casing cover and the seal cover (4710).
If a flaw is found, remove it by filing the relevant part with
sand paper.
(3)
Check the sliding surfaces for wear. Measure the amount of
wear, and check for surface roughness caused by a foreign
object caught in the mechanical seal.
(4)
In principle, the mechanical seal must be replaced with a
new one once it is overhauled, or the seat (4750) and the
washer (4720) must undergo re-lapping, regardless of an
amount of wear.
(5)
After the above inspection is completed, thoroughly wash
the disassembled parts with wash oil, etc.
5.6. Reassembling
5.6.1. Re-assembling procedure and precautions
Refer to the reassembling procedure for the type of the mechanical
seal being used.
Before reassembling the mechanical seal, be sure to clean the
disassembled parts. Check each part for damage, and check for a
missing part before reassembling the mechanical seal.
[A] Single mechanical seal (CA type)
(1)
Insert cushion ring (4101) in seat (4750) and push them
together into casing cover (1610).
When inserting the cushion ring into the seat, use caution
about the direction of the cushion ring. (Refer to Fig 5.6-1)
Fig 5.6-1 Cushion ring
(2)
With the seat and the cushion ring attached to the casing
cover, mount the casing cover to the bearing housing
(3300).
When mounting the casing cover to the bearing case, use
caution so as not to break the seat, and not to damage the
internal surface of the seat by hitting it against the shaft
(2100).
(3)
Apply a proper amount of oil to packing (4100) and shaft.
(4)
Insert the rotating side mechanical seal set {washer (4720),
packing, follower (4740), spring (4770), stopper (4850)}
through shaft. In this case, be sure to check whether dust,
etc. adhere to the seat and the seal end face S (Fig 5.2-1
(P.14)).
(5)
Mount the key (9400.2) to the shaft, and fit the impeller
(2300) on the shaft. Mount the washer (5500), and fully
tighten the Hard Lock Nut
(9233). This completes the
mechanical seal assembling procedure. For the pump
assembling procedure, refer to the steps of 4.2 (1) through
(8) (P.12). (Follow the disassembling procedure in reverse
order.)
[B] Single mechanical seal (Type: LCA, LA200,
L9SA, MBS100)
(1)
Put the O-ring (4120.1) in the seat (4750), and insert the
seat into the seal cover (4710).
a) Use caution about the positions of the seat whirl-stop
notch and pin (5600).
(See Fig 5.6-2)
b) When inserting the seat into the seal cover, be careful not
to damage the sliding surface of the seat.
c) After inserting the seat, re-check for misalignment of the
pin with the notch, and for inclination of the seat.
Fig 5.6-2 Relative positions of pin and notch
(2)
With the mechanical seal for the fixed side attached to the
seal cover, put the corresponding O-ring (4120.3) in the
seal cover. Fit the seal cover on the shaft (2100), and slide
the seal cover toward the bearing housing (3300). When
mounting the seal cover to the shaft, use thorough caution
Seat
Cushion ring
Seal cover
Seal cover
Sliding surface
Notch
Pin
Pin
Notch
Sliding surface
Example of proper positioning
Example of improper positioning
The pin is not aligned with the notch.
