Before making adjustments disconnect
pressure from system. Failure to do so
could result In electric shock or serious
Failure To Pump.
Motor will not start: Check power supply. Voltage must
be t 10% of nameplate rating when motor is in locked rotor
Motor runs and thermally kicks out: Check for excessive
pressure. Increase ventilation to motor. Do not use less
than #14 wire size.
Stator torn; possible excessive pressure: Replace stator,
check pressure at discharge port.
Flexible joint broken; possible excessive pressure:
Replace joint, check pressure at discharge port.
Wrong rotation: Rotation must be clockwise when facing
pump from motor end. Reverse the connections of any
two line leads to the motor.
Excessive suction lift or vacuum.
Excessive discharge pressure: Check pressure at
discharge port for maximum ratings given in Table 1.
Fluid viscosity too high: Limit fluid viscosity to 100 CP or
Excessive suction lift or vacuum: Maximum suction lift is
25 feet for water.
Suction line too small: Check pipe size. Be sure lines are
free from obstructions.
Pump cavitates: Pump speed is 1725 rpm. Viscosity of
fluid should not exceed 100 CP or 500 SSU.
Flexible joint worn: Replace joint. Check pressure at
Insufficient mounting: Mount to be secure to a firm base.
Vibration induced noise can be reduced by using mount
pads and short sections of hose on suction and discharge
Leakage at startup: If leakage is slight, allow pump to run
several hours to let faces run in.
Persistent seal leakage: Faces may be cracked from
freezing or thermal shock. Replace seal.
Pump Will Not Prime.
Air leak on suction side: Check pipe connections.
Before disassembling pump, disconnect
power source and thoroughly bleed pressure
from system. Failure to do so could result in
electric shock or serious bodily harm.
Disconnect power source.
Remove suction and discharge piping.
Remove screws (112) holding suction housing (2) to
discharge housing (1). Remove suction housing (2) and
Rotor (22) can be detached from flexible joint (24) by
using a punch to remove rotor pin (45). Support joint
when removing pin.
Flexible joint (24) can be removed from motor shaft by
using a punch through the discharge port to remove shaft
Carefully slide mechanical seal (69) off motor shaft.
Remove discharge housing (1) from motor (70) by
removing screws (112A and 112C) and washers (215).
Carefully pry seal seat out of discharge housing (1). If any
part of mechanical seal (69) is worn or broken, the
complete assembly should be replaced. Seal components
are matched parts and not interchangeable.
Remove slinger ring (77).
Replace slinger ring (77).
Attach discharge housing (1) to motor (70) using lock
washers (215) and body screws (112A).
Clean and oil sealing faces using light oil (not grease).
Do not use oil on EPDM parts. Substitute
glycerin or soap and water.
Oil the outer surface of seal seat, and push assembly
over motor shaft into the bore of the discharge
housing (1) seating it firmly and squarely.
After cleaning and oiling the shaft, slide the seal body
along the shaft until It meets the seal seat.
Install seat spring and spring retainer on shaft.
On model 36751, position seal spacer (69A) on motor
shaft with slots away from seal (69).
Pin flexible joint (24) to motor shaft with shaft pin (46)
using a punch through the discharge port.
Pin rotor (22) to flexible joint using rotor pin (45). Support
joint while installing pin.
Slide stator (21) on rotor (22) carefully locating stator
flange in housing groove.
Secure stator (21) and suction housing (2) to discharge
housing (1) using screws (112).
Proceed as in installation instructions.