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Installation – All Motors
4" Motors:
15 to 20 ft-lb (20 to 27 Nm)
6" Motors:
50 to 60 ft-lb (68 to 81 Nm)
8" Motors with 1-3/16” to 1-5/8” Jam Nut:
50 to 60 ft-lb (68 to 81 Nm)
8" Motors with 4 Screw Clamp Plate:
Apply increasing torque to the screws equally in a
criss-cross pattern until 80 to 90 in-lb (9.0 to 10.2
Nm) is reached.
Jam nut tightening torques recommended for fi eld
assembly are shown. Rubber compression set within the
fi rst few hours after assembly may reduce the jam nut
torque. This is a normal condition which does not indicate
reduced seal effectiveness. Retightening is not required,
but is permissible and recommended if original torque
was questionable.
A motor lead assembly should not be reused. A new lead
assembly should be used whenever one is removed from
the motor, because rubber set and possible damage from
removal may prevent proper resealing of the old lead.
All motors returned for warranty consideration must
have the lead returned with the motor.
Assemble coupling with non-toxic FDA approved
waterproof grease such as Mobile FM102, Texaco
CYGNUS2661, or approved equivalent. This prevents
abrasives from entering the spline area and prolongs
spline life.
A common question is why motor leads are smaller than
specifi ed in Franklin’s cable charts.
The leads are considered a part of the motor and actually
are a connection between the large supply wire and the
motor winding. The motor leads are short and there is
virtually no voltage drop across the lead.
In addition, the lead assemblies operate under water,
while at least part of the supply cable must operate in
air. Lead assemblies running under water operate cooler.
CAUTION: Lead assemblies on submersible motors
are suitable only for use in water and may overheat
and cause failure if operated in air.
Shaft Height and Free End Play
If the height, measured from the
pump-mounting surface of the
motor, is low and/or end play
exceeds the limit, the motor thrust
bearing is possibly damaged, and
should be replaced.
Tightening Motor Lead Connector Jam Nut
Table 41
Pump to Motor Coupling
Submersible Leads and Cables
41
MOTOR
NORMAL
SHAFT HEIGHT
DIMENSION
SHAFT HEIGHT
FREE END PLAY
MIN MAX.
4"
1 1/2" 38.1 mm
1.508"
1.498"
38.30
38.05
0.010"
0.25 mm
0.045"
1.14 mm
6"
2 7/8" 73.0 mm
2.875"
2.869"
73.02
72.88
0.030"
0.76 mm
0.050"
1.27 mm
8" TYPE 1
4" 101.6 mm
4.000"
3.990"
101.60
101.35
0.008"
0.20 mm
0.032"
0.81 mm
8" TYPE 2.1
4" 101.6 mm
4.000"
3.990"
101.60
101.35
0.030"
0.76 mm
0.080"
2.03 mm
mm
mm
mm
mm