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Lubrication
To check the lubrication oil level of the mechanical seal
perform the following:
Checking Lubrication Oil Level
1. Lay the pump (Figure 22) on its side with the oil plug
facing upwards.
2. Remove oil fill plug.
3. Visually inspect oil plug hole to verify that oil chamber
is full enough to cover seal spring.
4. When reinstalling oil fill plug, apply teflon tape to
prevent leaking.
WARNING
When removing oil fill plug, please note
that pressure may have built up in the oil
chamber. DO NOT fully remove plug until
pressure has been relieved. Turn oil fill plug
slowly to relieve pressure.
Changing Lubrication Oil
1. If lubrication oil level is low, block the oil fill opening
with a finger and roll pump to one side to drain oil into
a small container.
2. Use a funnel (Figure 22) and fill oil chamber with ISO
VG32 lubrication oil or equivalent. Oil chamber
capacity is 40 oz. (1,200 cc) for ST41230/ST41460
and 47 oz (1,400 cc) ST61230/ST61460. Fill to 75-80%
capacity to allow for expansion. Replace lubrication oil
once a year or 3,000 hours.
LAY PUMP FLAT
ON ITS SIDE
Figure 22. Adding Lubrication Oil
PAGE 28 — ST4/ST6 SERIES SUBMERSIBLE PUMPS • OPERATION MANUAL — REV. #4 (03/04/24)
REMOVE FILL PLUG, AND
VISUALLY INSPECT THAT
OIL CHAMBER IS FULL ENOUGH
TO COVER SEAL SPRING.
FILL TO 75-80% CAPACITY
FILL WITH ISO VG32 LUBRICATION
OIL OR EQUIVALENT.
CHECK HYDRAULIC OIL ONCE
A YEAR OR EVERY 3000 HOURS.
Inspecting Lubrication Oil (Mechanical Seal)
1. Block the oil fill opening with a finger and roll pump to
one side to drain (Figure 23) oil into a small transparent
container.
2. If oil is cloudy (milky) or has water in it, indicates
that mechanical seal is defective or worn. Replace
mechanical seal.
LAY PUMP FLAT
ON ITS SIDE
DISCOLORATION OF OIL (MILKY)
INDICATES A WORN OR DEFECTIVE
MECHANICAL SEAL. REPLACE
MECHANICAL SEAL.
Figure 23. Lubrication Oil Inspection
NOTICE
When replacing the oil in the oil chamber, shaft seal
MUST be changed at the same time.
MAINTENANCE
OIL FILL
OPENING
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