Valeport BFM001, Руководство по эксплуатации, Страница: 7 / 32

Section 3 | Maintenance Instructions
Page | 4
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2021
– Valeport Ltd
3.2 To Replace an Impeller Shaft
Refer to Figures 2 (BFM001) and Figure 4 (BFM002) .
i.
Remove the impeller as described above.
ii.
With a ring spanner, unscrew anti-clockwise the shaft lock nut and remove the shaft.
iii.
Clean main body hub face to remove any silt or dirt.
iv.
With a little Loctite applied to the shaft thread, replace the shaft and tighten the lock nut to give
the initial setting of the point of the shaft to the main body hub face.
v.
Refit the impeller as described above, and check that the tolerances are correct.
vi.
If shaft length requires adjusting, remove impeller, slacken lock nut, adjust shaft accordingly
and re-tighten.
vii.
Finally, check that pulses are being received by the Control Unit.
3.3 To Replace a Reed Switch Assembly
Refer to Figure 5 - Reed Switch Assembly .
i.
Hold reed switch adapter (cable end), unscrew the housing in an anticlockwise direction. If it is
tight, a pair of pliers may be used, but great care should be taken.
ii.
When fitting the replacement reed switch assembly, ensure that the 'O' ring is clean and in
position.
3.4 To Test the Free Running of the Impeller Assembly
i.
Stand the Meter on a flat surface with the impeller pointing vertically.
ii.
Spin the impeller by hand and observe it slowing down. The time to stop is unimportant, but is
normally about 20 seconds.
iii.
The impeller should stop spinning smoothly with no jerking being observed.
iv.
When it stops, a slight tap on the flat surface will allow the impeller to rotate slightly until the
magnets come into line.
The above condition applies when the unit is dry and in perfect condition. If the impeller stops
spinning suddenly or fails to spin smoothly, the impeller shaft may be bent or the clearances may
require adjustment (see
Figures 2 / Figure 4 )