1-AA-MD
The patented Little Giant magnetic drive pump design consists of a cylindrical drive magnet attached to the motor
shaft, which rotates around a chemical-resistant plastic separator housing. Inside this housing is a magnet fixed
to the impeller. The impeller assembly is free to rotate on a spindle that is supported at both ends. The spindle
is held captive and does not turn. Front and rear thrust washers are utilized as wear bearings. The washers are
held captive and do not revolve. This prevents wear on the shaft. With the magnetic coupling the motor drives the
impeller. This coupling eliminates the conventional shaft seal and its possibility of leakage.
PUMP MATERIALS
Plastic parts on pump are made of glass filled polypropylene. The spindle shaft is 316 stainless steel. Thrust
washers are Rulon J. Impeller driven magnet is uncoated ceramagnet A (barium ferrite) type ceramic. Static O-
Ring seal is Viton®.
INSTALLATION
Your Little Giant pump is delivered to you completely pre-assembled and pretested from the factory. It is ready
for immediate use. The pump may be installed in any position. It may be mounted vertically with the pump head
down. Proper plumbing connections should be made. See specification table to determine what size intake and
discharge your pump has. Make sure the wing nuts are tight before operating the pump.
Motor nameplates list all electrical data. Make sure the pump is connected to proper voltage before operating.
When wiring pumps with no plug, the green (or green/yellow) wire is the ground. The other two wires are line (live).
If fused type plug is used, a 2.0 amp fuse is recommended.
Do not allow the pump to run dry (without fluid). These pumps are not
submersible. Operate the pumps only in the in-line mode. Do not put
the units in liquid. Pump should be installed in a dry area and protected
from splash. These pumps are not self priming models. They must
be installed so that the pump head (volute) is flooded before starting.
That is, the inlet of the pump must be below the level of the surface of the
liquid being pumped. (See Figure 1.) Do not restrict the intake side of the
pump. Connections on the intake side should not be of smaller inside
diameter pipe or tubing or hose than the intake inside diameter of the
intake thread designation. If reduced flow is required restrict the discharge side. Installing a valve or other type of
restriction device on the discharge side is the proper method for reducing flow from the pump. When using a valve
the pump can be throttled to provide various flow rates and pressures without harming the motor or the pump
parts. The pump should not be installed in a manner that will subject it to splashing or spraying.
SERVICE INSTRUCTIONS
MAKE CERTAIN THE UNIT IS DISCONNECTED FROM THE POWER SOURCE BEFORE ATTEMPTING TO SERVICE OR
REMOVE ANY COMPONENT!
1. The motor’s sleeve bearings should be lubricated every six months with two to three drops of S.A.E. 20 weight non-
detergent oil. The oil holes are located on top at each end of the motor.
2. All wetted parts can be serviced by removing the 4 wing nuts (item 12) to the housing. The pump head components
can easily be replaced in the field if necessary.
3. Lightly clean any corrosion or debris which may clog the impeller.
4. If pump is tripping circuit breakers, GFCI, or not operating properly after cleaning, return to Little Giant or its
authorized service center. DO NOT attempt repairs yourself.
5. Be certain power cord is in good condition and contains no nicks or cuts.
PUMP CONSTRUCTION
ITEM
NO.
PART
NO.
DESCRIPTION*
PUMP MODEL & CATALOG
NUMBER*
1-AA-MD 588001
1-AA-MD 588002
1-AA-MD 588041
1
971054
Motor, 115 volt
1
-
1
1
971562
Motor, 230 volt
-
1
-
2
188030
Mounting bracket
1
1
1
3
921028
Washer, lock, #6
2
2
2
4
920002
Nut, hex, #6-32
2
2
2
5
188124
Drive magnet assembly
1
1
1
6
188001
Housing, magnet
1
1
1
7
911503
Stud, collared
4
4
4
8
921065
Washer, thrust
2
2
2
9
188100
Impeller assembly
1
1
1
10
188050
Shaft, impeller
1
1
1
11
924025
O-ring (Viton®)
1
1
1
12
188010
Volute
1
1
1
13
920020
Nut, 8-32
4
4
4
Figure 1
Form 993318 - 07/2007
©2007 Franklin Electric Co., Inc.
Little Giant® is a registered trademark of Franklin Electric Co., Inc.
Little Giant
P. O. Box 12010
Oklahoma City, OK 73157-2010
405.947.2511 • Fax: 405.947.8720
www.LittleGiantPump.com
*Parts list applies to products shown. Other models are available; however, parts may vary. For other models, contact
Parts Depot, factory, or distributor for replacement parts. Be sure to give the six digit product number and model number
when requesting parts.
*La liste de pièces s’applique aux produits montrés. D’autres modèles sont disponibles ; cependant, les pièces peuvent
varier. Pour les autres modèles, communiquez avec l’entrepôt de pièces, l’usine ou le distributeur pour les pièces de
remplacement. Veillez à indiquer les six chiffres du numéro de produit ainsi que le numéro de modèle lorsque vous
commandez des pièces.
*La lista de partes es aplicable a los productos que aparecen aquí. Hay otros modelos disponibles; sin embargo, las partes
pueden variar. Para otros modelos, comuníquese con el Almacén de partes, la fábrica o con los distribuidores de partes.
Asegúrese de proporcionar el número de producto de seis dígitos y el número de modelo cuando pida las partes.
