moyno 20302, Service Manual

Page: 13 / 40

Section:
MOYNO
®
500 PUMPS
Page: 1 of 8
Date: March 1, 1998
SERVICE MANUAL
MOYNO
®
500 PUMPS
300 SERIES
331, 332, 333, 344, 356 AND 367 MODELS
MODELS
DESIGN
FEATURES
33101 34401
33201 35601
33301 36701 33104 34404
33204 35604
33304 36704
33108 33308
33208 34408 34411
35611
35613
Housing: Cast Iron AISI 316 SS Nylon Cast Iron AISI 316 SS
Pump Rotor:
Chrome plated
416 SS Chrome plated
316 SS Chrome plated
416 SS Chrome plated
416 SS Chrome plated
316 SS
Pump Stator: NBR (Nitrile) NBR (Nitrile) NBR (Nitrile) NBR (Nitrile) NBR (Nitrile)
Shaft: 416 SS 316 SS 416 SS 416 SS 316 SS
Flexible Joint: Carbon steel/
NBR 316 SS/
NBR Carbon steel/
NBR Carbon steel/
NBR 316 SS/
NBR
Bearings: Ball (sealed) Ball (sealed) Ball (sealed) Ball (sealed) Ball (sealed)
Mechanical Seal: Carbon-ceramic Carbon-ceramic Carbon-ceramic --- ---
Packing:
--- --- --- Braided PTFE
Braided PTFE
Note: Alternate elastomers available. Refer to Repair/Conversion kit numbers, page 8.
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 or packing by adding fluid to
be pumped into suction and discharge ports. Turn shaft
over several times in a clockwise direction to work fluid into
elements.
Piping. Piping to pump should be self-supporting to avoid
excessive strain on pump housings. See Table 1 for suction
and discharge port sizes of each pump model. Use pipe
“dope” or tape to facilitate disassembly and to provide seal.
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.
Water Flush of Packing (356 Models Only). The packing
may be either grease lubricated through a grease fitting in
the stuffing box or have plumbing connected to the housing
to allow a water flush.
Maximum speed is 1750 rpm.
When the material being pumped is abrasive in nature, it
may be advantageous to flush the packing to prevent
leakage under packing and excessive shaft wear.
Mechanical Seal Models
Packing Gland Models