MP Pumps S300, S600, S700, & FM40 PUMPS INSTRUCTION - Manual (Page 2)

IMPORTANT:
Check for correct direction of rotation of
prime-mover. Check rotation of three phase
motors by turning on power only for an instant
so that pump
turns just a few revolutions (pro-
longed operation of pump in wrong direction may
damage it). If direction is wrong, reverse rotation
by interchanging any two of the three wires, ei-
ther at the motor or electric starter, in a three phase
electrical system.
Close gate valve in discharge line and start pump.
Open valve gradually to half-open position after driver
attains full speed. If pump fails to function after a few
seconds of operation, stop it, add more priming liquid
if needed, and let air escape completely. Restart the
pump.
FLOMAX 40, as a self-priming pump, requires that
the discharge valve be in the fully open position on
start-up to permit the air in the suction line to be ex-
pelled into the discharge line. Failure to open the dis-
charge line will prohibit the pump from priming itself.
Self-priming requires a minute or more for the pump
to evacuate the air from the suction before pumping
begins.
Do not permit the pump to run for more than a few
seconds unless it remains full of liquid and is discharg-
ing properly. Prolonged operation of an unprimed
pump can cause severe damage to rotating parts.
If the pump must be shut down after initial start up
while exposed to below freezing weather, protect it
and connected piping from damage by draining the
system completely or by introducing a corrosion in-
hibiting antifreeze to the system.
SERVICE AND MAINTENANCE INSTRUCTIONS
When seal maintenance is required, they can be ser-
viced by leaving the housing in the piping. All pumps
have back pull out design. Jackscrews are provided
to assist in removing the housing and seal cover.
NOTE:
A lifting eye is provided to lift the pump only. This
should not be used to lift the electric motor, base,
and pump assembly.
The following instructions assume the entire pump has
been removed from the piping and is on a bench to be
serviced. The instructions for back pullout are the
same with the exception that the two bolts holding the
bearing assembly to the rear support bracket should
be removed allowing the bearing adaptor, impeller,
and shaft assembly to be removed in the back pullout
mode. Refer to proper parts list.
There are two possible causes for leaks along the pump
shaft:
1. The impeller sealing gaskets could be worn or de-
fective causing leakage through the sleeve.(See Fig-
ure1). When the pump is operating this leakage can
be detected by visual inspection of the juncture be-
tween sleeve and the shoulder on the pump shaft.
2. A worn or defective seal. In most cases, a seal
leak will be a much higher capacity leak than that
of a leak underneath the sleeve. In addition, it will
be evident that leakage is coming out along the shaft
from underneath the seal.
As the pump is disassembled, carefully check the parts
to determine if the leakage was through the impeller seal-
ing gaskets rather than the seal. The removal proce-
dure outlined below may result in the destruction of the
seal and should not be used unless it is definitely estab-
lished that the seal is leaking.
STANDARD AND SEVERE SERVICE SEAL CHANGE
PROCEDURE:
Remove the pump housing as follows:
1. Remove the housing capscrews.
2. Using the outer set of jackscrews start the removal
of the housing. If the screws are missing use two of
the capscrews removed from the housing. The jack-
screws are not long enough to completely disengage
the housing from the adaptor.
Remove the impeller as follows:
1. Hold impeller with a small pry bar or piece of hard
wood in the discharge of the impeller.
2. Remove seal bolt with 3/4” socket. Also remove
stainless steel and Teflon sealing washers and O-ring,
3. Slide the impeller off the shaft. It may be necessary
use two small pry bars or large screwdrivers behind
the impeller to break it loose.
The seal head will frequently set up on the sleeve so
that it cannot be easily removed by hand. If this occurs,
it will be necessary to use the seal cover to assist in
removing the seal head from the sleeve as follows:
1. Remove the two capscrews holding the seal cover in
place.
2. Use the two jackscrews to start removal of the seal
cover.
3. When the jackscrews have been moved to the limit
the seal cover can be removed by hand. This will
remove the seal from the pump. In the event the
seal is firmly attached to the sleeve, the shaft sleeve
may also be removed with this procedure.
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