Crane WEINMAN WE411, Installation And Operation Manual, Page: 8 / 22

SECTION E: PREVENTATIVE MAINTENANCE
As the motor is oil filled, no lubrication or other maintenance is
required, and generally Weinman pumps will give very reliable
service and can be expected to operate for years on normal
sewage pumping without failure. However, as with any
mechanical piece of equipment a preventive maintenance
program is recommended and suggested to include the
following checks:
1) Inspect motor chamber 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 bearing and replace as required per section F-3.
4) Inspect seal for wear or leakage and repair as required
per section F-4
SECTION F: SERVICE AND REPAIR
NOTE: All item numbers ( ) refer to Figures 9 and 10.
CAUTION: - Operating pump builds up heat and
pressure; allow time for pump to cool to room
temperature before handling or servicing.
F-1) Lubrication:
Anytime the pump is removed from operation and at least every
twelve (12) months, the cooling oil in the motor housing (12)
must be checked visually for oil level and contamination.
F-1.1) Checking Oil:
To check oil, set unit upright. Remove pipe plug (21). With a
flashlight, visually inspect the oil in the motor housing (12) to
make sure it is clean, clear and that the oil level is above all
internal componentry . If oil appears satisfactory, replace pipe
plug. If oil is low or appears contaminated, test oil as per section
F-1.2
F-1.2) Testing Oil:
1.
Place pump on it’s side, remove pipe plug (21) and drain
oil into a clean, dry container.
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 (measures
above 15 KV. breakdown), refill the motor housing as per
section F-1.3.
4. If oil is found to be dirty or contaminated (or measures
below 15KV. breakdown), then the pump must be
carefully inspected for leaks at the shaft seal (3), cord
inlet (8), square ring (11), and pipe plug (21) before
refilling with oil. To locate the leak, perform a pressure
test as per section F-1.4. After leak is repaired, refill with
new oil as per section F-1.3.
TABLE 1 - COOLING OIL - Dielectric
SUPPLIER GRADE
BP Enerpar SE100
Conoco Pale Paraffin 22
Mobil D.T.E. Oil Light
G & G Oil Circulating 22
Woco Premium 100
F-1.3 Replacing Oil in Motor Housing:
Drain all oil from motor housing and dispose of properly. Refill
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 air expansion (see Fig. 8). Set unit upright and
fill only until the capacitor, or the motor for 3-phase, as viewed
through the fill plug hole is covered. When refilling with oil after
servicing the shaft seal (3), a pressure test as per section F-1.4
should be done. If shaft seal was not disturbed during service,
then apply pipe sealant and replace the pipe plug (21).
WARNING ! - DO NOT overfill oil. Overfilling of
motor housing with oil can create excessive and
dangerous hydraulic pressure which can destroy the
pump and create a hazard. overfilling oil voids warranty.
F-1.4) Pressure Test:
Before checking the pump for leaks around the shaft seal,
square ring, and cord inlet, the oil level should be full as
described in section F1.3. Apply pipe sealant to the pressure
gauge assembly and tighten into fill plug hole (see fig.4).
Pressurize motor housing to 10 P.S.I. Use a soap solution
around the sealed areas and inspect joints for "air bubbles".
If, after five minutes, the pressure is still holding constant, and
no "bubbles" are observed, slowly bleed the pressure and
remove the gauge assembly. Replace the pipe plug using a
sealant. If the pressure does not hold, then the leak must be
located.
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.
AIR
⇒
PRESSURE GAUGE
ASSEMBLY
(See Parts List)
Fig. 4
8