TECHNICAL SERVICE MANUAL
HEAVY-DUTY STEEL EXTERNAL BRACKET MOUNTED PUMPS
SERIES 123 AND 4123
SIZES LS, Q, QS, M
SECTION TSM
151.2
PAGE
1 OF 14
ISSUE
B
CONTENTS
Introduction
Special Information
Maintenance
Packed Pumps
Mechanical Seal Pumps
Standard Rubber Bellows Type
(Sizes LS, Q, QS & M)
Optional Teflon Seal
Thrust Bearing Adjustment
Installation of Carbon Graphite Bushings
Pressure Relief Valve Instructions
INTRODUCTION
The illustrations in this manual are for identification purposes
only and cannot be used for ordering parts. Obtain a parts
list from the factory or a Viking Representative. Always give
complete name of part, part number and material with model
number and serial number of pump when ordering repair
parts. The unmounted pump or pump unit model number
and serial number are on the nameplate.
In the Viking model number system, basic size letters are
combined with series number (123 and 4123) indicating both
unmounted or mounted pump unit.
UNMOUNTED PUMP
UNITS
PACKED
LS123
Q123
QS123
M123
MECH. SEAL
LS4123
Q4123
QS4123
M4123
Units are designated by the un-
mounted pump model numbers
followed by a letter(s)
indicating drive style.
V = V-Belt
D = Direct Connected
R = Viking Speed Reducer
P = Commercial Speed Reducer
This manual deals only with Series 123 and 4123 heavy-
duty Steel External Bracket Mounted Pumps. Refer to
Figures 1 through 14 for general configuration and
nomenclature used in this manual. Pump specifications and
recommendations are listed in Catalog Section 151, Series
123 and 4123 Heavy-Duty Steel External Bracket Mounted
Pumps.
FIGURE 1
SIZE LS
FIGURE 2
SIZES Q, QS AND M
VIKING PUMP INC. •
A Unit of IDEX Corporation •
1
2
2
3
7
11
12
12
13
