Barnes 4SCC Series, Installation And Operation Manual

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9
SECTION E: PREVENTATIVE MAINTENANCE
As the motor is air-fi lled, no lubrication or other maintenance
is required, and generally Barnes Pumps 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 seal chambers for oil level and contamination and
repair as required per section F-1.
2) Inspect impeller, adjust cutter knife and blade, repair or
replace as required per section F-2.
3) Inspect motor and bearings and replace as required per
section
F-3.
4) Inspect lower seal for wear or leakage and repair as
required per section F-4.
SECTION F: SERVICE AND REPAIR
NOTE: All item numbers in ( ) refer to Figures 9 or 10.
WARNING ! - Electrical power to the pump motors
must be disconnected and locked out to prevent
any dangerous electrical hazards or personnel
danger before any service work is done to the
pump
.
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 the cooling oil
in the seal chamber, must be checked visually for oil level and
contamination.
F-1.1) Checking Oil:
Seal Chamber- Place pump on its side with pipe plug (23)
downward, remove pipe plug (23) 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 lower shaft seal
(10) should be inspected and replaced if required.
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-1.2) Testing Oil:
1. Check oil for contamination using an oil tester with a
range to 30 Kilovolts breakdown.
2. If oil is found to be clean and uncontaminated (measure
above 15 KV. breakdown), refi ll seal chamber as per
section F-1.3.
3. If oil is found to be dirty or contaminated (or measures
below 15 KV. breakdown), the the pump must be carefully
inspected for leaks. 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.
F-1.3) Replacing Oil:
Seal Chamber- Refi ll chamber completely full (approx.
51oz.-1.5 liters) with new cooling oil per Table 1 or reuse the
uncontaminated oil.
F-1.4) Pressure Test:
Seal Chamber- Remove pipe plug (23) from intermediate
and check that seal chamber is full of oil. Apply pipe
sealant to pressure gauge assembly and tighten into hole
in intermediate. Pressurize seal chamber to 20-25 PSI and
check for leaks as outlined above, see Figure 3.
CAUTION ! - Always wear eye protection when
working on pumps.
CAUTION ! - Pressure builds up extremely
fast, increase pressure by “TAPPING” air
nozzle. Too much pressure will damage
seal. DO NOT EXCEED 20-25 P.S.I. in seal
chamber.
F-2) Impeller and Cutter Service:
F-2.1) Disassembly and Inspection:
To clean out or replace impeller (41), disconnect power,
remove cap screws (45) and washers (47) from volute (40),
vertically lift motor assembly from volute (40). Clean out
volute if necessary. Clean and examine impeller (41), for
pitting or wear and replace if required. If the impeller (40)
requires replacing, remove plug (50), screw (48) and washer
(49). The impeller is keyed onto the shaft with key (16) and
to remove, pull impeller straight off the shaft using a wheel
puller, if required. Carefully take out the impeller (41) so as
not to damage the lower seal.
NOTE: Seal spring relaxes
when impeller is removed and may cause oil to leak through.
CAUTION ! - Impeller and knife assemblies are
extremely sharp. Handle with care.
FIGURE 3
PRESSURE GAUGE
ASSEMBLY
20-25 PSI AIR