moyno 200, 20352, 20452, 20551, 22051 Service Manual

SERVICE MANUAL

DESIGN FEATURES

MOYNO® 500 PUMPS

200 SERIES MOTORIZED

20352, 20452, 20551, 20552, 22051 AND 22052

MODELS

Housing: AISI 316 stainless steel, or phenolic
Pump Rotor: Phenolic, AISI 316 stainless steel
Pump Stator: NBR (Nitrile)
Seal: Mechanical (carbon/ceramic)
Motor Shaft: AISI 316 stainless steel
Motor: 115V AC, 1/8 HP, 50/60 Hertz, 1725 rpm,

ball bearing, Class B insulation, capacitor
start (other motor options available;
consult Sales Representative)

Section:

MOYNO® 500 PUMPS

Page:1 of 4
Date: March 1, 1998

Note: Alternate elastomers available. Refer to
Repair/Conversion kit numbers, page 3.

INSTALLATION
Mounting Position. Pump may be mounted

in any position. When mounting vertically, it
is necessary to keep bearings above seals
to prevent possible seal leakage into
bearings.

Pre-Wetting. Prior to connecting pump, wet
pump elements and mechanical seal by
adding fluid to be pumped into suction and
discharge ports. Turn pump over several
times in a clockwise direction using
screwdriver slot in end of motor shaft.

Piping. Piping to pump should be self­supporting to avoid excessive strain on
pump housings; 3/8” NPT pipe for suction,
and. 1/4” NPT pipe for discharge on all metal
housing models. 5/8” ID hose with hose
clamp for suction and discharge ports of
plastic housing models. Use pipe “dope” or
tape to facilitate disassembly and to provide
seal on pipe connections.

Electrical. Follow the wiring diagram on the
motor nameplate or inside the terminal box
for the proper connections. The wiring
should be direct and conform to local
electrical codes. Check power connections
for proper voltage. Voltage variations must
not exceed ± 10% of nameplate voltage.
Motor is provided with internal automatic
overload protection.

To prevent damage to pump, pump rotation
must be clockwise when facing pump from
motor end.

OPERATION
Self-Priming. With wetted pumping

elements, the pump is capable of 25 feet of
suction lift with pipe size equal to port size.
Be sure suction lines are air tight or pump
will not self-prime.
DO NOT RUN DRY. Unit depends on liquid
pumped for lubrication. For proper
lubrication, flow rate should be at least 10%
of rated capacity.

Pressure and Temperature Limits.

Maximum discharge pressure is 40 psig.
Unit is suitable for service at temperatures
shown in Table 1.
Storage. Always drain pump for extended

storage periods by removing suction
housing bolts and loosening suction
housing.

Table 1. Temperature Limits

Elastomer Temperature Limits
*NBR 10°-160°F
*EPDM 10°-210°F
*FPM 10°-240°F
*NBR = Nitrile

EPDM = Ethylene-Propylene-Diene Terpolymer
FPM = Fluoroelastomer

Page 2

TROUBLE SHOOTING

WARNING:Before making adjustments,

disconnect power source and
thoroughly bleed pressure
from system. Failure to do so
could result in electric shock
or serious bodily harm.

Failure To Pump.

1. Motor won’t start: Check power supply.
Voltage must be ± 10% nameplate rating
when motor is in locked rotor condition.
Do not use less than #14 wire size.

2. Motor runs and thermally kicks out:
Increase ventilation to motor. Check for
defective relay, or defective capacitor.
Check for excessive pressure.

3. Stator torn; possibly excessive pressure:
Replace stator, check pressure at
discharge port.

4. Excessive suction lift or vacuum.

Pump Overloads.

1. Excessive discharge pressure: Check
discharge pressure for 40 psig maximum
or obstruction in discharge line.

2. Fluid viscosity too high: Limit fluid
viscosity to 100 CP or 500 SSU.

Noisy Operation.

1. Starved suction: Check fluid level, size of
piping. and obstructions in pipe.

2. Bearings worn: Replace parts

3. Insufficient mounting: Mount securely.
Reduce vibration induced noise by using
a short section of hose on discharge
piping.

Seal Leakage.

1. Leakage at startup: If leakage is slight,
allow pump to run several hours to let
faces run in.

2. Persistent seal leakage: Faces may be
cracked from freezing or thermal shock.
Replace seal.

Pump Will Not Prime.

1. Air leak on suction side: Check pipe
connections.

PUMP DISASSEMBLY

WARNING: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.

1. Remove suction and discharge piping.

2. Remove screws (112) holding suction housing (2)
and pump body (1) to motor (70). Remove
suction housing (2) and stator (21).

3. Remove rotor (22) from shaft by turning in a
counterclockwise direction. Keep shaft from
turning by inserting screwdriver in slotted end of
motor shaft.

4. Remove slinger ring (110), pump body (1), and
mechanical seal (69).

5. If any parts of the mechanical seal (69) are worn
or broken, the complete seal assembly should be
replaced. Seal components are matched parts
and are not interchangeable.

PUMP ASSEMBLY

1. Slip slinger ring (110) over motor shaft. Place
pump body (1) in position on motor (70).

2. Install mechanical seal (69) using the following
procedure:

a. Clean and oil sealing faces using a clean light

oil (not grease).

Caution: Do not use oil on EPDM parts. Substitute

glycerin or soap and water.

b. Oil the outer surface of the seal seat, and

push the assembly into the seal bore in the
pump body (1), seating it firmly and squarely.

c. After cleaning and oiling the shaft, slide the

seal body along the shaft until it meets the
seal seat.

d. Install seal spring and spring retainer on shaft.

3. Screw rotor (22) on shaft in a clockwise direction.
Keep shaft from turning by inserting screwdriver
in slotted end of motor shaft.

4. Secure stator (21), suction housing (2), and pump
body (1) to motor (70) using screws (112).

5. Connect hose or piping and proceed as in
installation instructions.