moyno 20302, Service Manual

Page: 25 / 40

Section:
MOYNO
®
500 PUMPS
Page:
1 of 6
Date:
March 1, 1998
SERVICE MANUAL
MOYNO
®
500 PUMPS
400 SERIES GRINDER PUMPS
41502, 42202,43302, AND 44402 MODELS
DESIGN FEATURES
Housing: Cast iron
Pump Rotor: Chrome plated AISI 416
stainless steel
Pump Stator:NBR (Nitrile)
Shaft:
AlSl 416 stainless steel
Bearings: Prelubricated, fully sealed
ball bearings
Seal: Mechanical
(carbon/ceramic)
Cutter Ring: Hardened steel
Cutter Disc: Cast iron
Cutter Tips: Carbide
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.
Pump is not self priming. Be sure pumping elements
are located at or below water line.
Piping. Piping to pump should be self-supporting to
avoid excessive strain on pump housings; 4” NPT
male connection on suction port, 1-1/4” NPT female
connection on discharge port. Be sure suction lines
are airtight. A non-clogging type check valve should
be used in discharge piping to prevent flow back
through pump. Use pipe “dope” or tape to facilitate
disassembly and to provide seal.
Drive. Any 56 frame, C-face, 1 HP, 1750 rpm, motor
may be selected to meet code or application
requirements. Motor is bolted directly to pump flange
using hardware supplied with pump.
CAUTION: Use only the rectangular key (202)
supplied with hardware kit to prevent
damage to shafts
.
Pump rotation must be clockwise when facing shaft
to prevent rotor unscrewing from shaft. Check
direction of rotation before startup.
Maximum speed is 1750 rpm and is the
recommended speed for most effective grinding.
OPERATION
Self-Priming. Pump is not self-priming. Pumping
elements should be located at or below water line. Be
sure suction lines are airtight.
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 80 feet of water or 35 psig. Unit
is suitable for service at 10° to 160°F.
Storage. Always drain pump for extended storage
periods.