CRANE PUMPS & SYSTEMS 6SED-L Series, Installation And Operation Manual

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SECTION E: PREVENTATIVE MAINTENANCE
As the motor is oil fi lled, no lubrication or other maintenance
is required, and generally will give very reliable service and
can be expected to operate for years on normal sewage
pumping without failing. However as with any mechanical
piece of equipment a preventive maintenance program is
recommended and suggested to include the following checks:
1) Inspect motor and seal chambers for oil level and
contamination and repair as required per section F-1.
2) Inspect impeller and body for excessive build-up or
clogging and repair as required per section F-2.
3) Inspect motor and bearings and replace as required per
section
F-3.
4) Inspect seal and diaphragm for wear or leakage and
repair as required per section F-4.
5) Before stopping operation, be sure to keep pumping
supernatent water or clean water for a period of time to
fl ush out accumulated substances from pump.
SECTION F: SERVICE AND REPAIR
NOTE: All item numbers in ( ) refer to Figures 9 & 10.
F-1) Lubrication:
Anytime the pump is removed from operation the cooling oil
in the motor housing (2) and seal chamber, must be checked
visually for oil level and contamination.
F-1.1) Checking Oil:
Motor Housing -
To check oil, set unit upright. Remove cap
screws (6), lift conduit box assembly (10) from motor housing
(2) but
DO NOT disconnect conduit box wiring from motor
leads. With a fl ashlight, visually inspect the oil in the motor
housing (2) to make sure it is clean, clear and that oil level is
above all internal componentry.
Seal Chamber - Place pump on its side with the square head
pipe plug (22) downward (180°from discharge on bearing
bracket 21), remove pipe plug (22) and drain oil from the seal
chamber. If the oil is found to contain considerable water
or other contamination or little oil drains out, the shaft seal
(46) and diaphragm (32) should be inspected and replaced if
required.
F-1.2) Testing Oil:
1. Place pump on it’s side, remove cap screws (6), lift
conduit box assembly (10) from motor housing (2) and
drain oil into a clean, dry container. In separate container
drain seal chamber by removing pipe plug (22).
2. Check oil for contamination using an oil tester with a
range to 30 Kilovolts breakdown.
3. If oil is found to be clean and uncontaminated (measure
above 15 KV. breakdown), refi ll the motor housing and
seal chamber as per section F-1.3.
4. If oil is found to be dirty or contaminated (or measures
below 15 KV. breakdown), the the pump must be
carefully inspected for leaks at the shaft seal (46),
conduit box assembly (10), diaphragm (32), O-rings
(42), pipe plugs (22) and (45) and pressure valve (5)
before refi lling with oil. To locate the leak, perform a
pressure test as per section F-1.4. After leak is repaired,
refi ll with new oil as per section F-1.3.
TABLE 1 - COOLING OIL - Dielectric
SUPPLIER GRADE
BP Enerpar SE100
Conoco Pale Paraffi n 22
Mobile D.T.E. Oil Light
G & G Oil Circulating 22
Imperial Oil Voltesso-35
Shell Canada Transformer-10
Texaco Diala-Oil-AX
Woco Premium 100
F-1.3) Replacing Oil:
Motor Housing -
Drain all oil from motor housing and dispose
of properly. Refi ll with (see parts list for amount) new cooling
oil as per Table 1. An air space must remain in the top of the
motor housing to compensate for oil expansion (see Fig.
9). Set unit upright and fi ll only until the motor, as viewed
through the conduit box opening, is just covered and no more.
Reassemble the O-ring (11), conduit box assembly (10) and
cap screws (6), apply thread locking compound to each cap
screw (6) thread before installing. Torque cap screws (6) to 15
ft, lb.
Seal Chamber - Refi ll chamber completely full with new
cooling oil per Table 1 or reuse the uncontaminated oil.
WARNING ! - DO NOT overfi ll oil.
Overfi lling of motor housing with oil can
create excessive and dangerous hydraulic
pressure which can destroy the pump
and create a hazard. Overfi lling oil voids
warranty.
F-1.4) Pressure Test:
Motor Housing -
Before checking the pump for leaks around
the shaft seal, square rings, and cord inlet, the oil level should
be full as described in section F-1.3. Remove pressure valve
(5) from motor housing (2). Apply pipe sealant to pressure
gauge assembly and tighten into pressure valve hole (see Fig.
2). Pressurize motor housing to 10 P.S.I. Use a soap solution
around the sealed areas and inspect joints for “air bubbles”. If,
after fi ve minutes, the pressure is still holding constant, and no
“bubbles” are observed, slowly bleed the pressure and remove
the gauge assembly. Replace the Pressure valve using a
sealant. If the pressure does not hold, then the leak must be
located.
Seal Chamber - Remove pipe plug (22) from Bearing Bracket
(21) and check that seal chamber is full of oil. Apply pipe
sealant to pressure gauge assembly and tighten into hole in
bearing bracket (21). Pressurize seal chamber to 20-25 PSI
and check for leaks as outlined above.
CAUTION ! - pressure builds up extremely
fast, increase pressure by “TAPPING” AIR
nozzle. Too much pressure will damage
seal. DO NOT exceed 10 P.S.I. in motor
housing & 20-25 P.S.I. in seal chamber.