Graymills MSPR Series Pump OMI - Manual (Page 3)

• To RETURN pump to service, replace all plugs and piping
using Teflon™ tape or equivalent on male threads.
• Refer to “OPERATION” section of manual.
DISASSEMBLY
See Figure 2 for Reference Numbers.
• Place wrenches on adapter (16) and suction head (1), and
unscrew discharge head and casing (3).
NOTICE: Casing has a left hand thread on both ends
and is sealed with o-rings (2).
• Remove clip ring (8) from end of shaft (13). The stages,
each comprising a bowl (9), impeller (10) and diffuser (11)
may now be removed. If pump has been clogged by foreign
matter, but otherwise undamaged, further dismantling may be
unnecessary. If shaft assembly (13), shaft seal (15) or motor
are to be replaced proceed as follows:
• Remove plug from rear of motor and hold motor shaft with
screwdriver. Unscrew pump shaft coupling assembly (13)
from motor shaft. This is a left hand thread. Remove four
motor mounting bolts (17), separate the motor from frame by
withdrawing it straight back.
• Motor may have to be pried with two screwdrivers if the
shaft seal sticks. The shaft seal stationary seat may be pushed
out of adapter from the motor side. There is a rubber cou-
pling o-ring (19) between motor shaft and coupling which
will usually remain on the motor shaft as the seal is pulled
over it.
REASSEMBLY
• Clean all parts, especially pump and motor register fits, and
the seal seat counterbore in frame.
• Clean casing, pump coupling and motor shaft threads being
sure to remove all the remaining locking compound. A wire
brush is an efficient tool for this task.
• Lubricate counterbore of frame and rubber cup of new
mechanical seal stationary face (white ceramic) with soapy
water and press into counterbore squarely and evenly.
WARNING
Do not mar or contaminate the lapped face of the
seal (face without groove).
• Check that the slinger (20) and the coupling o-ring (19) are
on the motor shaft. If they are worn or damaged, replace.
Install stationary face in motor adapter (16) and mount motor
adapter (16) to motor. Install seal rotating element, making
sure faces are clean and that the last rubber member goes
over the coupling o-ring and onto the motor shaft. Screw the
pump shaft and coupling assembly (13) on until it seats up
against the motor shaft. This is a left hand thread. Place 2
or 3 shims on top of coupling to start with, then place dif-
fuser (11), impeller (10) and bowl (9) over shaft. With a
feeler gage check the gap between the face of the impeller
and the stainless bowl. This gap should be maintained at
.020 - .030". Check this gap as stages are added. After all
stages are on the shaft, add shims over shaft until clip ring
(8) can be inserted tightly into groove.
NOTICE: A stage is made up of the stainless steel
bowl, impeller and diffuser which can be assembled
prior to inserting them on the pump shaft.
• Check o-ring on both motor adapter (16) and suction head
(1) and replace if damaged. Install and screw on casing (3).
Note casing is a left hand thread. Thread on suction head (1).
This is a left hand thread. Torque to 70 ft-lbs.
• With screwdriver in the slotted end of the pump shaft, turn
the unit over before replacing plug. It should turn with no
resistance except that of the shaft seal.
Problem Probable Cause
Motor not running Open circuit breaker or blown
fuse.
Impeller binding.
Motor improperly wired.
Defective motor.
Pump not generating Incorrect rotation.
enough pressure Intake port plugged or too close
to bottom of tank.
Improper piping installed with
unnecessary fittings and
decreases in diameter.
Low fluid level.
Excessive power Impeller binding.
consumption Excessive flow rate.
Fluid viscosity and/or specific
gravity too high.
Problem Probable Cause
Little or no liquid Liquid in tank below suction.
delivered Pump is not primed; air or gases
in fluid.
Discharge, suction plugged or
valve closed.
Incorrect rotation.
Low voltage or phase loss.
Impeller worn or plugged with
debris.
System head too high.
Excessive noise and Impeller binding.
vibration Pump is not primed, air or gases
in fluid.
Discharge, suction plugged or
valve closed.
Impeller worn or plugged with
debris.
Excessive flow rate.
Worn bearing.
Pump, motor or piping loose.
TROUBLESHOOTING