moyno 331, 333, 332, 344 Service Manual

Section:
MOYNO®500 PUMPS
Page: 1 of 4 Date: March 2002
SERVICE MANUAL
MOYNO®500 PUMPS
SANITARY/HYGIENIC NON-MOTORIZED
331, 332, 333 AND 344 MODELS
SANITARY MODELS
These pumps include housings polished to a #4 finish both inside and out. The mechanical seal is a 3A approved seal with carbon/ceramic faces. The elastomers meet the FDA requirement for food contact. These pumps meet 3A requirements. The universal joint may be dismantled for cleaning.
HYGIENIC MODELS
These pumps provide the quick disassembly features of the sanitary version for easy cleaning. The housings are 316 stainless steel construction, however, they are not polished. These pumps utilize rubber-covered universal joints.The stators are available in non-FDA nitrile, EPDM, and fluoroelastomers. The mechanical seals are rubber bellows type with carbon/ceramic faces.
INSTALLATION
Mounting Position.Pump may be mounted in an y position.
When mounting vertically, it is necessary to keep the bearings above the seals to prevent possible seal leakage into the bearings.
Pre-Wetting. Prior to connection the pump, wet the pump elements and mechanical seal by adding fluid to be pumped into suction and discharge ports.Turn the shaft over several times in a clockwise direction to work fluid into the elements.
Piping. Piping to the pump should be self-supporting to avoid excessive strain on pump housings.
Drive. On belt driven units, adjust belt tension to point of non-slip.Do not overtighten.
On direct drive units, coupling components should be
aligned and spaced at least 1/16" apart.
Pump rotation must be clockwise when facing shaft to pre­vent damage to pump. Check direction of rotation before startup. Maximum speed is 1750 rpm.
Table 1. Pump Data
Table 2.Temperature Limits
Pump Models Discharge
Pressure (psig) (maximum)
331 332 333 344
150 100 50 40
Elastomer Temperature Limits
*NBR (Nitrile) 10˚-160˚F
*EPDM 10˚-210˚F
FPM (Fluoroelastomer) 10˚-240˚F
* FDA Food Grade on Sanitary Models.
OPERATION
Self-Priming. With wetted pumping elements, the pump
is capable of 25 feet of suction lift when operating at 1750 rpm with pipe size equal to port size.
DO NOT RUN DRY. The unit depends on liquid pumped for lubrication. For proper lubrication, the flow rate should be at least 10% of rated capacity.
Pressure and Temperature Limits. See Table 1 for max­imum discharge pressure of each model.The unit is suitable for service at temperatures shown in Table 2.
Storage. Always drain the pump for extended storage periods by removing the suction housing and stator.
TROUBLESHOOTING
WARNING: Before making adjustments, disconnect
power source and thoroughly bleed pres­sure from system prior to disassembly. Failure to do so could lead to electric shock or serious bodily harm.
Failure T o Pump.
1. Belt or coupling slip: Adjust belt tension or tighten set
screw on coupling.
2. Stator torn; possibly excessive pressure: Replace
stator and check pressure at the discharge port.
3. Wrong rotation: Rotation must be clockwise when
facing shaft.
4. Threads in rotor or on shaft stripped: Replace part.
Check for proper rotation.
5. Excessive suction lift or vacuum.
Pump Overloads.
1. Excessive discharge pressure: Check discharge pressure for maximum rating given in Table 1. Check for obstruction in discharge pipe.
2. Fluid viscosity too high: Limit fluid viscosity to 20,000 CP or 100,000 SSU.
3. Insufficient motor HP: Check HP requirement, consult factory.
Noisy Operation.
1. Starved suction: Check fluid supply, length of suction line, and obstructions in pipe.
2. Bearings worn: Replace parts; check alignment, belt
tension, pressure at the discharge port.
3. Broken flexible joint: Replace part, check pressure at
the discharge port.
4. Insufficient mounting: Mount to be secure to firm base. Vibration induced noise can be reduced by using mount pads.
Mechanical Seal Leakage.
1. Leakage at star tup: 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.
MAINTENANCE
General. These pumps have been designed for minimal
maintenance — routine lubrication and adjustment of pack­ing. The pump is one of the easiest to work on because the main elements are very accessible and require no tools to disassemble.
Bearing Lubrication. The prelubricated, fully sealed bear-
ings do not require additional lubrication.
PUMP DISASSEMBLY
WARNING: Before disassembling pump, disconnect
power source and thoroughly bleed pressure from system. Failure to do so could result in electrical shock or serious bodily harm.
1. Disconnect suction and discharge piping.
2. Remove quick clamp (80) holding suction housing (2) to pump body (1A). Remove suction housing and stator (21).
3. Remove rotor (22) from flexible joint (24) by turning counterclockwise (RH thread).
4. Flexible joints (24) can be removed from shaft (26) by turning counterclockwise with a 3/16 Allen wrench. Universal joints in the sanitary pump may be further disassembled by removing the snap rings, allowing the pins to be removed.
5.Carefully slide the mechanical seal (69) off the shaft (26). Carefully pry the seal seat out of the pump body (1A). If any parts of the mechanical seal are worn or broken, the com­plete seal assembly should be replaced. Seal components are matched parts and are not interchangeable.
6. The bearings (29) and shaft (26) assembly can be removed from pump body (1B) after the snap ring (66) has been removed.To remove the assembly, lightly tap the shaft at threaded end using a block of wood to protect the threads.The bearings may be pressed off the shaft.
Page 2
Viscosity CP Limit RPM
1-300 1750
300-1,000 1200 1,000-2,000 700 2,000-5,000 350
5,000-10,000 180
10,000-20,000 100
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