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8480
8350-C
8450
8430
8430
8450
8350-C
8350-A
8480
8470
A.0500.551 – IM-TGMAG/02.00 EN (02/2008)
4.3.2 Pre-assembly of the back-pull-out
4.3.2.1 Adjustment of the axial clearance of the
circulation pump
1. Place pump insert (8430) and radial bearing holder
(8350-C) in the intermediate cover (8450). Do not
use any shim (8470) at this stage.
Remark: There are two different inserts according to
the sense of rotation of the pump shaft (see sketch).
2. Fit cap head screws (8480) and tighten them cross-
wise to fix the radial bearing holder (8350-C) and
insert (8430) to the intermediate cover (8450).
3. Mount axial bearing (8350-A) into the insert (8430).
Do not use any force and be careful not to damage
the bearing faces while pushing part (8350-A) in until
the bearing faces are making contact.
4. Measure the distance between front face of the axial
bearing holder (8350-A)(front face gear tooth) and
the front face of the crescent of the pump insert
(8430).
5. Calculate the required thickness of the bearing
shim (8470): S = X – C.
Axial clearance C see table below.
TG MAG
Axial clearance C
[mm]
15-50 0.120 – 0.200
23-65 0.125 – 0.215
58-80 0.150 – 0.250
86-100 0.165 – 0.275
185-125 0.190 – 0.320