MAGNETIC DRIVE PUMPS
SERIES 823 - STEEL
825 - CAST IRON
827 - STAINLESS STEEL
SIZES LQ, LS, Q & QS
VIKING PUMP, INC.
•
A Unit of IDEX Corporation
•
Cedar Falls, IA 50613 USA
SECTION TSM 845.1
PAGE
1 Of 13
ISSUE
C
TECHNICAL SERVICE MANUAL
CONTENTS
WARNING !
Persons with surgical implants of a
metallic or electronic nature should
avoid working on pump – especially the
inner magnet assembly.
MODEL NUMBER CHART
UNMOUNTED PUMP
UNITS
LQ-825, 823, 827
Units are designated by the un-
mounted pump model numbers
followed by the magnetic coupling
size and a letter indicating drive style:
B – Bracket Mount
R – Viking Reducer Drive
P = Commercial Reducer Drive
(Example: LS-827 MD-D140 R)
LS-825, 823, 827
Q-825, 823, 827
QS-825, 823, 827
Introduction . . . . . . . . . . . . . . . . . . . . . . . 1
Special Information . . . . . . . . . . . . . . . . . . . 3
Pressure Relief Valves . . . . . . . . . . . . . . . . . 3
Maintenance . . . . . . . . . . . . . . . . . . . . . . 3
Disassembly: Pump. . . . . . . . . . . . . . . . . . . 6
Pump Rotation . . . . . . . . . . . . . . . . . . . . . 7
Port Arrangement . . . . . . . . . . . . . . . . . . . . 7
Disassembly: MD-D Series Coupling . . . . . . . . . . 7
Bearing Housing . . . . . . . . . . . . . . . . . . . . 9
Disassembly of Bearing Housing . . . . . . . . . . 9
Assembly of Bearing Housing . . . . . . . . . . . . 9
Installation of Bushings . . . . . . . . . . . . . . . . . 9
Pump Assembly. . . . . . . . . . . . . . . . . . . . .10
Adjusting Head Gasket End Clearance . . . . . . . . 11
Assembly: D Series Coupling . . . . . . . . . . . . . 11
Troubleshooting . . . . . . . . . . . . . . . . . . . . 12
Pressure Relief Valves . . . . . . . . . . . . . . . . 12
Pressure Adjustment . . . . . . . . . . . . . . . 12
Disassembly: Relief Valve. . . . . . . . . . . . . 13
Assembly: Relief Valve . . . . . . . . . . . . . . 13
fIGURE 1
LS-825 MD-D290 R
Complete Unit on Base with Viking “C” Reducer
fIGURE 2
QS-825 MD-D450 B
Bearing Carrier, footed Pump and Coupling Bracket
Jacketed Pump Bracket
INTRODUCTION
The illustrations used in this manual are for identification
purposes only and should not be used for ordering parts.
Secure a parts list from the factory or a Viking
®
representative.
Always give the complete name of the part, model and serial
number of the pump when ordering repair parts. The pump
model and serial number can be found on the nameplate
secured to the pump.
In the Viking model number system, the basic size letters are
combined with series number (825, 823, or 827) indicating
basic pump construction material (cast iron, steel or stainless
steel).
This manual deals only with Series 825, 823 and 827 magnetic
drive pumps and couplings.
Refer to figures 1 through
21
for general configurations and nomenclature used in this
manual. Pump specifications and recommendations are listed
in Catalog Section 845.
