Johnson Controls AS instruction manual 11.5Assembly, 11.4.4Bearing removal, Clearances

11.4.4Bearing 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).

11.5Assembly

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.

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

C

B

A

IM-AS/02.00 GB (0412) 13