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Page 509

8. Remove the rotating element from

the sleeve.  Refer to Figure 4-3.
The element normally adheres
tightly to the sleeve and some
force may be necessary to remove
it.  This is common and if care is
taken, the element can be
reassembled and reused.  It is
recommended that a new
rotating element be used for
reassembly.
  DO NOT attempt to
remove the seal using a screw-
driver or other sharp object.
Extensive damage to the shaft,
sleeve, or element could occur.

9. Before the motor bracket (#1) can

be removed, the four (4) “O”rings
(#8), located on the upper left and
right studs must be removed.

a. Gently tap on the back of the

motor bracket, alternating
between the left and right side,
until the motor bracket moves
approximately 1/4".

b. Tap the motor bracket face to

move it back to its original
position.

c. Remove the "O" rings by sliding

them off the studs.

d. Slide the motor bracket straight

off. Do not attempt to remove
the motor bracket without first
removing the "O" rings (#8).

10.Remove the seat portion of the

seal, Refer to Figure 4-6.

a. Place the motor bracket face

down on a flat surface.

b. Look into the opening in the

center of the bracket, you will
see a portion of the seat.

c. Insert the 1" dowel and, very

gently, tap the seat until it drops
out.

d. Care must be taken with the

seats.  They are often a brittle
material and are prone to
breakage.  It is recommended
that a new replacement seat
be installed during reassem-
bly.

11.It is not necessary to remove the

locking collar (#14) on the motor
shaft unless motor repairs are

planned. Note the condition of the
setscrew in the collar and replce if
necessary. The two studs (#18) may
also be left in the motor face.

4C Disassembly (C15 and P15)

The following tools and equipment are
needed for disassembly of C15 and
P15 units:

1. Soft plastic or wooden mallet.
2. 9/16" wrench or socket.
3. Two 10" or larger adjustable

wrenches.

4. Penetrating oil.
5. 1" wood dowel ( Approx. 6" long).
6. Thin blade screwdriver.
7. Two large blade screwdrivers.
8. Cealube G or similar glycol base

lubricant. (DO NOT use petroleum
products.)

To disassemble the pump:

Refer to Figures 4-11 and 4-12 for
reference to the numbered parts in the
disassembly below.

1. Remove all liquid from the pump.

2. Remove the two (2) 3/8" nuts (#20),

and the two (2) 3/8" X 4" bolts (# 19)
from the cover. (#2)

3. Remove the cover.  In some cases,

light tapping with a plastic or wooden
mallet on the outside diameter of the
cover may be required to loosen it
from the motor bracket.  Care should
be taken if a screwdriver is needed
to pry between the cover and motor
bracket.  Damage to the “O” ring (#7)
and/or impeller can result.

4.  Remove the impeller (#11), refer to

Figure 4-7.  The impeller  is a slip fit
and, under normal conditions, can
be removed by gently tapping on the
end of the shaft sleeve with a mallet.
Leave the impeller key (#23) in

Figrue 4-7

Figure 4-6

place.  Striking the sleeve too hard
could damage the seat or rotating
element.

5.  Remove the impeller drive hub,

Refer to Figure 4-8.  Two (2)
adjustable wrenches are used to
remove the impeller drive hub
(#14).

a. Adjust one wrench to fit over

the sleeve and engage the
impeller key.  Adjust the second
wrench to fit the impeller nut
(#15).

b. Holding both wrenches, turn the

impeller nut counter-clockwise.

c. After the impeller nut is re-

moved, the impeller drive hub
can be removed.

d. The hub is keyed and can be

removed using two large bladed
screwdrivers.

e. Insert the blades of the screw-

drivers between the
springholder on the rotating
element and the shoulder of the
hub.

f. Holding the screwdrivers at

approximately 3 o’clock and 9
o’clock, push the handles in
toward the motor body, using
the motor bracket for leverage.
Refer to Figure 4-9.  This
procedure usually does not
require excessive force.  Care
should be taken not to damage
the hub or motor shaft.

6. Remove the rotating element from

the shaft.  The element normally
adheres tightly to the motor shaft
and some force may be necessary
to remove it.  This is common and
if care is taken, the element can
be reassembled and reused.  It is
recommended that a new

Summary of Contents for T51 SERIES

Page 1: ...PUMPS VERTICAL FLANGE MOUNTED CLOSE COUPLED PUMPS FLEXIBLE COUPLED PUMPS Section T51 Page 501 Dated January 2000 97 4623 01 588 MTH PUMPS 401 West Main Street Plano IL 60545 1436 Phone 630 552 4115 Fa...

Page 2: ...refer to the disassembly reassembly instruc tions in Section 4 Loosen the thrubolts clamping the assembly together three full turns no more Fill the pump with water Apply torque 50 foot pounds maximum...

Page 3: ...ne of the pump in feet Hf All friction losses from the vessel to the pump in feet NPSH 2 31 Hs Hf For boiling liquids Ps and Pvp are equal This item then becomes zero and can be omitted from the equat...

Page 4: ...on it is only necessary to embed the edges It is unnecessary to completely fill under the baseplate DO NOT grout the unit to the foundation until it has been properly aligned The foundation must be a...

Page 5: ...ipe hangers and pipe supports should be used to carry piping to avoid misalignment and distortion Consideration should be given to thermally induced expansion and contraction particularly in long runs...

Page 6: ...peller vanes and can sometimes lock up the pump If a new pump does not operate properly the first thing to check for is damage from foreign material 3D Electrical It is important to be aware of and fo...

Page 7: ...o the self primer 1 A check valve necessary to maintain a vacuum in the suction line as surging occurs in the pump 2 An air eliminator used on the discharge side of the pump to separate air from liqui...

Page 8: ...To disassemble the pump Refer to Figures 4 4 and 4 5 for reference to the numbered parts in the procedures below 1 Remove all liquid from the pump Air blown through the pump will remove the water quic...

Page 9: ...Thin blade screwdriver 7 Two large blade screwdrivers 8 Cealube G or similar glycol base lubricant DO NOT use petroleum products To disassemble the pump Refer to Figures 4 11 and 4 12 for reference t...

Page 10: ...acement seat be installed during reassembly 4D Inspection of Components Thoroughly clean all parts All components should be examined for wear and corrosion Replace any parts that show visible wear If...

Page 11: ...installed in the motor bracket before the bracket is installed on the motor To install the seat a Place the motor bracket face up on a flat surface 15 14 1 7 125 12 23 11 23A 60 19 2 18 20 b Carefull...

Page 12: ...of the motor bracket i While maintaining inward pressure on the sleeve with one hand line up the collar setscrews with the key in the shaft sleeve one setscrew on each side of the key j Tighten the se...

Page 13: ...he seat cavity of the motor bracket Care must be taken not to damage the seat face Thumb pressure is usually sufficient to install the seat 2 Install the motor bracket a While holding the motor bracke...

Page 14: ...peller hub should be facing out away from the motor bracket c If the impeller does not fit repeat steps a and b to determine the problem 5 Place O ring 7 into the O ring groove in the motor bracket It...

Page 15: ...a plastic or wooden mallet gently tap on the end of the shaft until it slides out of the frame Both bearings should come out with the shaft Do not use a metal hammer severe damage to the shaft will o...

Page 16: ...aring to insure proper installa tion and to prevent bearing damage The bearings must seat against the shoulder for proper alignment Refer to Figure 4 23 Also refer to Alternate bearing installation pr...

Page 17: ...earing Pedestal 30 23 17 24 4 21 3 33 24A 30 23 17 24 4 33 24A 3 NAME DESCRIPTION PART NO QTY Bearing Pedestal 3 1 Snap Ring Bearing Retainer 4 1 Shaft 17 1 Flinger 21 1 Key Coupling 23 1 Ball Bearing...

Page 18: ...n liquid Install a separator in the suction line Check the seal on the inlet end of the pump to determine if air is being drawn in Hydrostatically test the system to insure that there are no leaks 3 M...

Page 19: ...ent Piping load on pump RPM or pump pressure too high 2 Pump locked up Pump dried out and close clearance areas rusted Follow installation instructions for loosening the pump Foreign material in pump...

Page 20: ...er this express warranty any applicable im plied warranty or claims for negligence except to the extent that this limitation is found to be unen forceable under the applicable State law Some States do...

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