Maxum 4100 SCB - Bilge Pump Operation and Testing

Chapter 2: Components/Systems 19
4100 SCB Owner’s Manual Supplement
Bilge Pump Routing
Bilge Pump Testing
Bilge pumps should be manually tested often to verify that
they are working properly. To test a bilge pump’s operation,
activate the dash-mounted switch and verify that water in the
bilge is pumped overboard. If bilge water is present and the
pump motor is running but not pumping, inspect the discharge
hose for a kink or collapsed area. If no problems are found,
check the bilge pump housing for clogging debris as follows:
1. Remove the power cartridge:
a. Lift the tab while rotating the fins counterclockwise.
b. Lift out the power cartridge.
c. Clear the outer housing of debris.
2. Reinstall the power cartridge:
a. Make sure the O-ring is properly seated.
b. Coat the O-ring with a light film of vegetable or min-
eral oil.
c. Align the two cams on either side of the power car-
tridge with the two slots on the outer housing and
press the power cartridge into the housing while
twisting clockwise. To ensure proper reinstallation,
attempt to twist the fins counterclockwise without
lifting the tab; the cartridge should stay in place.
Autofloat Switches
Automatic bilge pumps use electromagnetic float (autofloat) switches to automatically activate the pump whenever
water accumulates above a preset level in the bilge. One autofloat switch is mounted next to the bilge pump it acti-
vates, and is wired directly to the battery so it will function even when the yacht is completely shut down and left
unattended. Autofloat switches should be tested often for proper operation as follows:
FORWARD BILGE PUMP
& AUTOFLOAT SWITCH
TO THRU-HULL
BILGE PUMP ROUTINGS
TO THRUHULLS
AFT BILGE PUMP &
AUTOFLOAT SWITCH
MID BILGE PUMP
& AUTOFLOAT SWITCH
OF OIL
O-RING
TAB
FIN
POWER
CARTRIDGE
SLOT (TYPICAL)
CAM
(TYPICAL)
LIGHT FILM
BILGE PUMP
COMPONENTS
TYPICAL
OUTER
HOUSING