Use mechanical lifting equipment to lift assemblies and components.
Do not apply heat to parts to assist in disassembly. Explosion
could occur causing personal injury, death, and/or damage to
the equipment.
Do not attempt to drill, saw or otherwise cut parts to remove
them. Explosion and/or fuming could occur causing personal
injury, death and/or equipment damage.
Do not hammer on any parts. Personal injury and/or damage
to equipment may occur.
WARNING—EXTREME HAZARD TO PERSONS WITH PACEMAKERS:
DO NOT WORK IN CLOSE PROXIMITY WITH UNASSEMBLED
OR DIS-ASSEMBLED MAGNETIC PARTS WITHOUT FIRST CON-
SULTING YOUR PHYSICIAN. IT IS POSSIBLE THAT THE STRONG
MAGNETIC FIELD ASSOCIATED WITH THESE PARTS COULD
RESET YOUR PACEMAKER HEART RATE OR CAUSE OTHER
SERIOUS PROBLEMS.
CAUTION:
This unit contains powerful magnets. Personal injury
could occur if parts are not adequately restrained when in the
presence of the magnetic field. Remove your watch as the magnetic
field will ruin it. Proceed with dis-assembly in an area which has
been cleared of loose, ferrous articles and particles. A wood bench
is the preferred work top, but a steel bench, with a 3/4" plywood
board laid on top, will suffice.
If there is any question about the strength of the magnetic coupling,
it should be checked at this time.
Measure the strength of the magnetic coupling (the attracting force
between the inner magnet assembly (175) and the outer magnet
assembly (167)) to see if the magnets are still capable of transmit-
ting the needed power. Hold the impeller (3) against rotation by
inserting a piece of flat steel into it’s periphery between the blades
for use as a lever. DO NOT use the impeller nut (12) to resist the
torque. Use a torque wrench to apply torque to the coupling end of
the drive shaft (29A).
Apply torque gently and evenly until you feel a “slight” softening of
resistance, and read this torque. Do not continue to increase the
torque beyond this point as the magnets will disengage (decouple)
and jump one sixth (60 degrees) of a revolution. If the magnets
disengage and “jump” the shock could break the internal bearing
components.
Compare the torque reading you obtain with the chart below for
the size of the magnetic coupling in your pump.
The number of rows of magnets in your pump will be shown in
the paperwork for that particular pump. If you do not have that
information at hand, you can measure the axial length of the
magnets in the outer magnet assembly (167) and compare it
with the value shown in the chart above for your particular
pump size. This, of course, can not be accomplished until the
pump is further disassembled.
If the torque you obtain is less than the minimum value shown
in the chart, the inner magnet assembly (175), the outer mag-
net assembly (167), or both need to be replaced. Return these
to Dean Pump for determination of which or both are bad.
To further dismantle the pump, perform the following steps in
the sequence shown:
a)
Insert a piece of flat steel into the periphery of the
impeller (3), between the blades of the impeller (3), to
restrain it from turning while loosening the locking set
screw (12D), and then the impeller nut (12) (both right
hand threads). Remove the locking set screw (12D),
from the impeller nut (12),and throw it away. Remove
the impeller nut (12), the impeller spring washer (12B),
the impeller washer (12A), the impeller (3), the impeller
key (4) and the front thrust collar (210).
b)
Make a handle by drilling a hole in the middle of a
piece of flat steel bar stock. For Frame I & II pumps, use
a 1/2" or 5/8" thick, 1-1/2" or 2" wide, 15" to 18"
long bar and drill a 3/4" or 13/16" diameter hole. For
Frame III pumps, use a 1/2" or 5/8" thick, 2" or 2-
1/2" wide, 16" to 20" long bar, and drill a 1-1/4" to
1-3/8" diameter hole. Place this handle over the pump
shaft (29) and replace the impeller washer (12A) and
impeller nut (12).
An optional eye bolt is available from Dean Pump which
screws onto the end of the pump shaft to facilitate lifting
instead of the bar described above. The eye bolt would
provide a place to hook a hoist.
c)
Remove the two cap screws which hold the frame (26)
to the casing cover (22).
d)
Stand the unit up on end so that the pump shaft axis is
vertical and the unit is resting upon the face of the
coupling hub. Support the pump in this position.
Use a small hoist hooked to the flat bar handle
described in paragraph (b) or to the optional eye bolt
mentioned in paragraph (b). Using great caution, lift
the inner rotating assembly out of the frame (26).
CAUTION:
the assemblies which you are separating contain
very strong magnets which will resist the separation. You
must have both assemblies held firmly as they are pulled
apart because the energy in the magnets will work to
“snap” them back together like a strong spring.
DO NOT attempt this separation manually due to the
possibility of personal injury and damage to equipment.
e)
CAUTION:
The inner (175) and the outer (167) magnet
assemblies are now exposed and will attract any fer-
rous metal which comes within about four inches.
Wrenches will “snap” rapidly against the magnets and
pinch fingers or chip the magnets.
Pump Size
Rows of Magnets/Length
1
2
3
4
5
6
.6”
1.1”
1.7”
2.3”
2.8”
3.4”
1 x 1
1
/
2
x 6
7.5
16.7
27.2
38.4
NA
NA
1
1
/
2
x 3 x 6
7.5
16.7
27.2
38.4
NA
NA
1 x 1
1
/
2
x 8
7.5
16.7
27.2
38.4
NA
NA
2 x 3 x 6
7.5
16.7
27.2
38.4
50.3
62.4
1
1
/
2
x 3 x 8
1
/
2
7.5
16.7
27.2
38.4
50.3
62.4
Rows of Magnets/Length
All Other
1
2
3
4
5
Pump Sizes
.8”
1.5”
2.3”
3.0”
3.8”
22.8
58.2
90.6
125
159
A
LLOWABLE
W
ORKING
P
RESSURE VS
. P
UMPING
T
EMPERATURE
22
7
M
INIMUM
T
ORQUE
I
N
F
OOT
-P
OUNDS
