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IM-AS/02.00 GB (0412)
11.4.4 Bearing removal
1. Remove shroud adapter (43) (if assembled) by loosening the screws (45).
2. Unscrew the screws (27).
3. Remove the bearing cover (8).
4. Press out the shaft and bearing assembly from the bearing housing (5).
5. Unscrew the ring nut (17).
Press out the shaft (4) from the bearing (7).
11.5 Assembly
Remark: It is recommended to pre-assemble the pump without the seal. Shim the pump
according to the clearance table to obtain the correct impeller clearance, and thereafter
assemble the pump with seal.
Exception: AS 42 and AS 52 (two stage pumps) which have floating impellers (shim free).
11.5.1 Clearances
Defined clearances for AS – range to be shimmed
•A= Behind impeller, Clearance between Impeller and Pump casing
• B= Front of impeller, Clearance between Impeller and Cover
• C= Clearance between, Pump Casing and Cover
To remember:
C clearance is machined, B will be given depending on the shims put under A, Behind
impeller, should be correct
If problems occur concentrate on the A clearance it is the most important, if there will
be a deviation make sure that it will be at B clearance
If it is other problems please contact Johnson pump or dealer for advice.
A
B
C
Pump clearances defined and shimmed
AS
pumps A B C
AS 40 0.15 15
AS 50 0.15 0.15 2.85
AS60-65 0.2 0.2 2.80
AS 80 0.3 0.3 4.20