SCOT MOTORPUMP User manual

SCOT MOTORPUMP™
JM FRAME
SELF PRIMING
1.50” TYPE 21 MECHANICAL SEAL
zINSTALLATION zOPERATION zMAINTENANCE
INCLUDES MECHANICAL SEAL REPLACEMENT
Check pump for shortage and damage immediately upon
arrival. Note damage or shortage on freight bill (bill of
lading); immediately file claim with carrier.
EXTERIOR — Pay particular attention to conduit box,
external hardware and accessories. Touch up abrasions
or scratches with approved paint.
INTERNAL — If extensive or serious external damage
is noted, if impeller is damaged (look in ports), or if shaft
binds or sticks, disassemble as required to permit
internal inspection.
Handle with care. Dropping or jarring can seriously
damage motor bearings or break pump parts. Lift with
device having capacity for pump weight, and use lifting
hooks or eye bolts (if provided) or rig double sling around
motor frame and pump casing. Do not use sling through
pump motor adapter.
Location — Pump location should provide the
following:
1. Install as close to suction supply as possible.
2. Shortest and most direct suction pipe or hose
practical. Suction height will have a negative effect
on pump flow. The higher the lift, the more dramatic
the reduction will be. Maximum practical suction lift
is 25 feet vertically from the surface of the liquid.
3. Room for inspection and maintenance.
4. Correct power supply to motor; all wiring should
meet National Electrical and Local Codes and
Regulations.
5. If outdoors, protection from the elements, freezing
and water damage due to flooding.
Piping — Suction and discharge gauges are useful to
check pump operation and are excellent trouble
indicators. Install gauges in the lines. Observe these
precautions when installing piping:
1. Support close to, but independently
of pump.
2. Use the next larger pump size for suction
and discharge.
3. Keep as straight as possible. Avoid bends
and fittings.
4. Remove burrs, sharp edges, ream pipe cuts and
make joints air-tight.
5. Don’t spring pipe to make connections.
Strain must not be transmitted to pump.
6. Allow for pipe expansion with hot fluids;
expansion joints are not recommended.
Suction — Size and install suction piping to keep
pressure loss at minimum and to provide correct NPSH
by observing the following:
1. The suction pipe should be equal in size to the
suction connection of the pump. If pipe is larger
than the pump suction, an eccentric pipe reducer
should be used at the pump.
INSTALLATION
HANDLING
INSPECTION
61.000.278
NOVEMBER 2009
• Cedarburg, WI 53012 • P.O. Box 286 • 262-377-7000 • FAX [phone]
SCOT DIVISION OF ARDOX CORP. — HOME OFFICE
Replaces Jan 2005

2. For hose applications, use reinforced type that will
not collapse under suction. Use thread sealer to
make sure all suction connections are airtight.
3. Attach a suction strainer (if required) to the end of
the suction hose. Be sure to keep the suction
hose submerged.
4. A valve in the suction is necessary only on positive
suction head installation and must not be used to
throttle the pump. The suction valve should be
installed for maintenance purposes only.
5. If the system will allow back siphoning to liquid
source, a check valve must be installed.
Discharge — Ensure there is adequate clearance
with selected position between wall or tank, motor
conduit box, and grease fittings. Casing may extend
beyond base or feet.
1. Short discharge lines may be the same size as the
discharge port. Long runs require a pipe larger
than the discharge port.
2. Long horizontal runs require a grade as even as
possible. Avoid high spots and loops. Trapped air
will throttle flow and may result in erratic pumping.
3. Install check and gate valves in discharge line;
check valve (if used) between pump and gate valve.
Pre-Start — Before initial start of the pump, check as
follows:
1. The rotation must be checked upon installation.
Close, then break the contacts quickly and observe
the rotation of the exposed portion of the rotating
parts. Rotation must agree with the rotation arrow
on the motor. For all pumps, the standard rotation is
counterclockwise when viewed from the suction
end. Motor wiring is easily changed in the field.
Observe the wiring diagram on the inside of the ter-
minal box cover, or on the motor nameplate.
2. Check voltage, phase and frequency of line circuit
with motor nameplate.
3. Check suction and discharge piping and
pressure gauges for proper operation.
4. Assure that pump is full of liquid.
Priming — Priming depends on the height of the
suction lift. Maximum practical suction lift is 25 feet
vertically from the surface of the liquid. The lower the
suction lift, the quicker the pump will prime.
1. For pumps required to lift (self prime) open prime
plug in pump case. Fill case with liquid. Reinstall
prime plug in case.
2. Prime pumps installed with a flooded suction by
opening the suction valve and allowing liquid to
enter the casing, at the same time venting air out
the top of the casing.
CAUTION - DO NOT RUN PUMP DRY. Serious damage
may result if started dry.
Starting — Proceed as follows to start pump:
1. Close drain valves and valve in discharge line.
2. Open valve in the suction line.
3. Open fill plug in pump case and completely fill
case with liquid.
4. Start the motor (pump).
5. When pump is operating at full speed,
open discharge valve slowly.
6. Allow sufficient time for pump to self prime. Pump
must evacuate air from suction pipe and lift water
to pump case. Consequently, priming time will vary
with suction height and liquid being pumped.
7. If pump does not prime properly, or loses prime
during start-up, shut down and correct condition
before repeating procedure.
Running — Periodically inspect pump while running,
but especially after first start and following repair.
1. Check pump and piping for leaks.
Repair immediately.
2. Record pressure gauge readings for future
reference.
3. Record voltage, amperage per phase, and kW
(if an indicating wattmeter is available).
4. Adjust pump output capacity with discharge valve.
DO NOT throttle suction line.
Freezing Protection — Protect pumps shut down
during freezing conditions by one of the following
methods:
1. Drain pump; remove all liquid from the casing.
2. Keep fluid moving in pump and insulate or heat
the pump to prevent freezing. If heated, do not let
temperature go above 100 to 150 degrees F.
3. Fill pump completely with antifreeze solution.
OPERATION
INSTALLATION, CONT.

Cleaning — Remove oil , dust, dirt, water, chemicals
from exterior or motor and pump. Keep motor air inlet
and outlet open. Blow out interior of open motors with
clean compressed air at low pressure. Regularly drain
moisture from TEFC motors.
Labeled Motors — It is imperative for repair of a
motor with Underwriters’ Laboratories label that original
clearances be held; that all plugs, screws, other
hardware be fastened securely, and that parts
replacements be exact duplicates or approved equals.
Violation of any of the above invalidates Underwriters’
label.
Temperature — Total temperature, not the rise, is the
measure of safe operation for a motor. If temperature by
thermometer exceeds limits for insulation class,
investigate and change operating conditions.
Lubrication — Pumps should require no
maintenance, other than the motor bearings,
according to the following instructions:
DOUBLE SHIELDED. When double shielded
prelubricated bearings are furnished, no lubrication is
required for the life of the bearings. Inspect bearings
periodically to determine the condition of the grease and
replace the bearings if necessary.
SINGLE SHIELDED W/GREASE FITTING PROVISIONS.
When single shield bearings are furnished, periodic
inspection, cleaning and relubrication is required. See
motor manufacturer’s specific instructions for
lubrication.
A.) Disassembly:
1. Turn off power.
2. Close suction and discharge valves.
3. Drain pump.
4. Remove bolts holding down pump to
mounting plate.
5. Remove casing bolts.
6. Remove motor and rotating element
from casing, leaving casing and piping
undisturbed. (The 8716 and 8717 models are
equipped with a diffuser. Remove (2) 10-24
nuts and (2) #10 lockwashers and remove
diffuser.) See Figure 1.
7. Insert a screwdriver in one of the impeller
waterway passages and back off the
impeller retaining assembly with a
socket wrench, as shown in Figure 2.
MECHANICAL SEAL REPLACEMENTMAINTENANCE
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
LOSS
OF
SUCTION
1. Air leak in suction line or fittings
2. Suction head too high
3. Plugged strainer
Repair or replace suction line
Lower suction head
Clean or repair strainer
PUMP LEAKS
Worn mechanical seal
Replace seal
LITTLE
OR NO
DISCHARGE
1. Casing not filled with water
2. Total head too high
3. Impeller plugged
4. Hole or leak in suction line
5. Impeller worn or damaged
6. Strainer or suction line not
submerged deep enough in water
7. Discharge hose kinked
8. Suction hose collapsed
9. Suction or discharge line valves
closed
Fill case with water
Shorten suction lift and/or discharge head
Disassemble pump and clean impeller
Repair or replace suction line
Replace impeller
Submerge lower in water
Straighten out to exhaust air
Replace with reinforced suction hose
Open
Figure 1 — 8716 & 8717 Models Only

8. Remove impeller from shaft, being careful
not to lose the impeller key, spring and seal
retainer. If impeller is difficult to remove, it
may be necessary to use a bearing puller to
remove.
9. Pry off rotating member of mechanical seal
from sleeve by using two (2) screwdrivers.
(Figure 3)
10. Remove bolts holding adapter to motor and
take off adapter.
11. Place adapter on a flat surface with case
rabbet facing down, and push out stationary
part of mechanical seal.
12. Inspect shaft sleeve, shaft O-ring and flinger.
If damaged or worn, remove and replace
with a new one.
B.) Reassembly:
CAUTION: The mechanical seal is a
precision product and should be handled
accordingly. Use care when handling lapped
running surfaces of the mechanical seal to
ensure they remain clean and are free of
chips or scratches.
1. Clean gasket and flange faces, seal seat
cavity, shaft sleeve, and motor shaft.
2. Position the stationary seat with the silver
dot down (away from you) and the lapped
face (shiny side) facing you. Lubricate the
seal seat cavity of the adapter and the rub-
ber cup or O-ring of seal seat with the lubri-
cating fluid that comes with the mechanical
seal or repair kit. Press the stationary seat
in seal seat cavity of the adapter squarely
and evenly using a arbor press (if possible)
and the cardboard disc supplied with the
seal. Be certain that the lapped face (shiny
side) is facing you.
3. Install the flinger on the motor shaft until it
bottoms on the motor shaft.
4. Slide the shaft O-ring on the motor shaft
until it is tight against the flinger. Make sure
that the shaft O-ring does not get damaged
during this procedure.
5. Position shaft sleeve chamfer towards
motor and slide on motor shaft.
6. With motor preferably in vertical position,
remount the adapter on motor, making sure
the motor shaft does not dislocate or chip
the stationary seat of the seal.
7. Apply the lubricating fluid that comes with
the mechanical seal or repair kit to the shaft
sleeve and the rubber bellows of the rotary
seal. Slide the seal head on the sleeve,
press the rubber drive band on the rotary
head until the lapped face on the head seats
firmly against the lapped face of the
stationary seat. Install seal spring on head
and seal spring retainer on spring. Do not
chip or scratch faces during installation.
Take extra care to make sure the lapped
faces are clean.
8. Place key in key seat. Line up keyway in
impeller with key on motor shaft, and slide
impeller on motor shaft. Be certain that the
key is positioned in the keyway of the motor
and impeller. Slightly compress seal spring
with impeller and hold impeller while
installing impeller retaining assembly in
motor shaft. (On 8716-8717 Models, reinstall
the diffuser with 10-24 nuts and #10 lock-
washers.)
9. Insert a screwdriver in a waterway passage
of the impeller holding it against rotation and
tighten impeller retaining assembly as
described in paragraph 7 of the disassembly
instructions. The impeller will compress the
seal spring to the proper length assuring the
correct pressure on the lapped surfaces.
10. Remove any burrs caused by screwdriver on
the vane of impeller in waterway passage.
11. Slide motor and rotating element in casing.
Be sure that any damaged O-ring or gasket
is replaced.
12. Tighten casing bolts alternately and evenly.
13. Replace hold-down bolts.
14. Check for free rotation after assembly is
completed.
15. Seal all drain openings, using pipe sealant
on threads.
16. Reprime before starting. Do not start unit
until pump is completely filled with water.
The approved lubricating fluid for seal
installation is included with the mechanical
seal or repair kit. DO NOT USE OTHER
LUBRICATING LIQUIDS!
WE RECOMMEND STOCKING A SPARE
MECHANICAL SEAL OR REPAIR KIT
TO ELIMINATE DOWN TIME.
MECHANICAL SEAL REPLACEMENT
CONT.
Figure 3
Figure 2