Specifications

6
Yearly Maintenance for SBE 5M
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. Replace the o-ring and 2 thrust washers on
the shaft:
A. Remove the o-ring from the shaft. A pair
of tweezers works well for this.
B. Pull the impeller and attached magnet off
the shaft. The thrust washer above the
impeller will come off at the same time.
Inspect the impeller for salt build-up, and
clean if necessary. Inspect the magnet for
wear. Particularly in sandy coastal
environments, the magnet may be worn
down from abrasion. If necessary,
replace the impeller / magnet assembly
(PN 30009).
C. Remove the second thrust washer from the bottom of the shaft. A pair of tweezers works well for this.
D. Inspect the shaft for wear.
E. Rinse the shaft and depression in the housing with clean, fresh water. Allow to dry.
F. Using new thrust washers (2 of PN 30010) and o-ring (PN 30095), replace the thrust washer and impeller /
magnet on the shaft. Replace the other thrust washer and o-ring on the shaft, above the impeller, pushing hard
with your fingertip to seat the thrust washer and o-ring in place.
4. Inspect the end cap o-rings and the mating surface on the pump head for dirt, nicks, and cuts. Clean or replace as
necessary. Apply a light coat of o-ring lubricant (Parker Super O Lube) to the o-rings and mating surfaces.
5. 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.
6. Reinstall the pump head on the end cap.
7. Inspect the bulkhead connector for corrosion, which is a sign of seawater leakage between the bulkhead connector
and cable. If there is corrosion, thoroughly clean the connector with water, followed by alcohol. Inspect the
bulkhead connector for chips, cracks, or other flaws that may compromise the seal. Inspect the mating cables
connector for cuts, nicks, breaks, or other problems that may compromise the seal. Give the connector surfaces a
light coating of silicon grease, and remate the connector properly; see Application Note 57: I/O Connector Care
and Installation.
If the bulkhead connector is severely corroded or damaged, it must be replaced. Sea-Bird recommends that
this work be performed at the factory, because the pumps physical configuration makes customer-
replacement of the connector difficult.
Pump
head
End cap
and im
p
elle
r
PN 30571
o-ring
PN 31011
o-ring
PN
30095
o-ring
PN
30010
thrust
washer
PN 30009
impeller/
magnet
Shaft
End cap
SBE 5M with Pump Head and Impeller Removed
PN
30010
thrust
washer
