MP Pumps FRX-100 316 INSTALL - Manual (Page 2)

PIPING/MOUNTING:
The pump inlet and outlet has 1 pipe connections. Use
pipe sealant on the threads and other connections. The
base does not require direct mounting if one of the pipe
flanges is rigid mounted. Do not rigid mount both the
flanges and the base to avoid mounting tolerances that
may distort the motor base. Install the pump with the
shaft in a horizontal direction. Never install the pump
vertical with the motor below the pump.
ELECTRICAL:
The motor must be protected from over current by using a
fuse or circuit breaker (see chart below for correct protec-
tion). The proper minimum wire size is stated for each
voltage application. Make sure that the pump has the
proper voltage rating to match the installation power. Do not
use or install if the voltage on the label is different that the
installation. All wire connections must be secure and sealed
to protect arcing. Follow all local installation codes.
OPERATION :
The pump should be operated with liquid in the pump
otherwise seal damage may occur. If an inlet valve is
present, the valve should always be completely open
during operation to avoid cavitation. An outlet valve may
be used to throttle the flow rate. Avoid repeated starts
and stops; the pump can operate for a long period of
time without any flow.
REPAIR AND MAINTENANCE:
The pump has a carbon/ceramic seal that may last several
thousand hours based upon the application. If the motor is
replaced, the mechanical shaft seal should also be replaced.
A seal that leaks will show leakage through the slot be-
tween the pump housing and the motor. Extreme leakage
may damage the motor bearings and contaminate the
inside of the motor.
DISASSEMBLY:
1. Remove the three cover screws and remove the
cover discarding the o-ring.
2. Secure the motor shaft at the back of the motor and
remove the impeller by rotating it counter clockwise.
3. Remove the spring keeper, spring and rotating portion
of the seal by pulling them off by hand. A screw driver
may be used to pry the seal up if it is sticking.
4. Remove the four capscrews that hold the
housing /adaptor assembly onto the motor. Remove
the housing /adaptor assembly and push the seal
seat out from the back side using a screwdriver.
INSPECT PUMP PARTS:
Always replace the mechanical seal. Check the seal for
dry run wear or damage. Check the motor shaft for wear
at the secondary sealing surface from the mechanical
seal. If worn, replace the motor. Check the motor bear-
ings by rotating the motor by hand. If the shaft rotation is
not smooth or has radial / axial endplay, replace the
motor. Check the impeller running surface between the
impeller and cover. If the surfaces are worn or irregular,
replace each item.
Clean the parts that are to be reused using a solvent or
mild cleaner. Remove abrasive material.
REASSEMBLY:
1. Press the new seal seat into the pump housing. A
light lubricant may be used to aid in the assembly.
Install the pump housing/adaptor assembly onto the
motor and fasten with the four capscrews.
2. Install the rotating portion of the mechanical seal
by sliding the seal (carbon side down) over the
motor shaft. Place the spring and spring keeper over
the back of the rotating portion of the seal.
3. Place the impeller onto the motor shaft, taking care to
pilot the spring keeper onto the shoulder at the back
of the impeller. Thread the impeller onto the motor
shaft until it bottoms out on the shaft. Thread locking
grade Loctite should be used to secure the nut.
4. Stretch the o-ring over the cover pilot. Install the cover
onto the housing and fasten the capscrews and
loc
ITEM PART NO. DESCRIPTION QTY.
NO.
1 34930 CAPSCREW - S.S. - 5/16-18 X 5/8 3
2 21238 LOCKWASHER - S.S. - 5/16 3
* 3 34926 COVER - 316 S.S. 1
* 4 35001 O-RING - VITON 1
* 5 34927 IMPELLER - 316 S.S. - 3.75 DIA. 1
* 6 35052 SEAL - VITON 1
* 7 34924 HOUSING - 316 S.S. 1
8 21251 HEXHEAD CAPSCREW - -S.S. - 3/8-16 X 7/8 4
9 21266 LOCKWASHER - S.S. -3/8 4
* 10 34928 ADAPTER RING - 56C 1
11 21435 SLINGER - NEO. - 1 X .6 1
12 33564 LOCKWASHER - S.S. - 1/4 4
13 21504 HEXHEAD CAPSCREW - S.S. - 1/4-20 X 5/8 4
14 35035 EL. MTR. - 56J TEFC 1
*- RECOMMENDED REPLACEMENT PARTS
kwashers.
FORM 3808A (03-07)