Specifications

5
SBE 5M
Periodic Cleaning for SBE 5M
If you are going to store the pump for more than 1 week, or have
removed the pump from a mooring, perform a more thorough cleaning:
CAUTION: Remove the end cap and impeller from the housing
before cleaning the impeller. The end cap o-rings seal the electronics
chamber. The end cap may walk out of the housing after the pump head
is removed, allowing water to enter the electronics chamber if you clean
the impeller without first removing the end cap from the housing.
1. Unscrew the pump head from the housing.
2. Pull out the end cap from the housing.
3. Using clean, fresh water, thoroughly rinse the pump head and impeller.
4. Inspect the impeller for salt deposits. Clean any deposits with clean, fresh water and a toothbrush. Verify that the
impeller can turn freely.
5. Inspect the shaft, and the o-ring and thrust washer holding the impeller on the shaft. There is another thrust washer
underneath the impeller magnet, inside the housing. If this thrust washer is in good condition, you should observe a
small gap between the bottom of the impeller and the end cap. If there is no gap, the thrust washer is worn and
needs to be replaced (see Yearly Maintenance for SBE 5M for replacement procedure).
6. Apply a light coat of o-ring lubricant (Parker Super O Lube) to the o-ring and mating surfaces. Reinstall the end
cap in the housing, carefully aligning the end cap with the housing and pushing hard on the end cap to seat the first
o-ring in the housing (only 1 o-ring should now be visible).
CAUTION: If you are not careful, you may pinch the o-ring, which may allow water to enter the housing,
damaging the electronics.
7. Reinstall the pump head on the end cap.
Pump
head
End cap
o-rings
End cap
and im
p
elle
r
SBE 5M with Pump Head Removed
Impeller 
note salt
deposit
End cap
Shaft,
o-ring,
and
thrust
washe
r
Impeller
End cap
Shaft
Note small gap
between impeller
and end cap.
Absence of gap
indicates worn
thrust washer
under impeller
magnet.
