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MODEL
INTAKE
DISCH.
NO.
SIZE
SIZE
VOLTS
HERTZ
3X-MDX 5/8" O.D. 5/8" O.D.
115
3-MDX
5/8" O.D. 5/8" O.D.
115
KEY:OPEN=Open Motor—FC=Fan Cooled
NOTE: Performance Data Shown In Table Above Is For 115 Volt 60 Hertz Operation
ELECTRICAL CONNECTIONS
Check the pump label for proper voltage required. Do
not connect to voltage other than that shown.
If pump is supplied with a 3-prong electrical plug,
the third prong is to ground the pump to prevent pos-
sible electrical shock hazard. DO NOT REMOVE the
third prong from the plug. A separate branch circuit
is recommended. Do not use an extension cord. Do
not cut plug from the cord. If the plug is cut or the
cord is shortened, then this action will void the war-
ranty.
If the cord is equipped with stripped lead wires,
such as on 230v models, be sure that the lead wires
are connected to a power source correctly. The
green/yellow wire is the ground, the other two are live.
OPERATION
The pump is supplied completely preassembled and pretested from the factory. Make sure the wing
nuts are tight before operating the pump.
Use a thread sealer on all pipe connections and hand tighten only.
The pump is not self priming. It must be operated with the volute intake below the liquid level.
This pump is not submersible. Operate the pump only in the in-line mode. DO NOT put the unit in liq-
uid. Pump should be located in a well ventilated area and away from where accidental water spillage
would cause wetting of the pump.
The weight of the pump must be supported adequately. DO NOT support the pump by the intake and
discharge connections alone.
Do not allow the pump to run dry (without liquid). Heat build up caused by friction will damage the pump
parts when dry.
Do not attempt to restrict the intake side of these pumps. Restricting the intake may cause damage to the
pump head. If you require reduced flow rates, then place a valve on the discharge side of the pump or if flexi-
ble vinyl tubing is used, a clamp can be used on the tubing to restrict the flow.
If the unit is going to be idle for a period of time, follow the cleaning instructions outlined in the next sec-
tion. Do not let the unit freeze in the wintertime. This may cause cracking or distortion that may destroy the
unit.
SERVICE INSTRUCTIONS
MAKE CERTAIN THAT THE UNIT IS DISCONNECTED FROM THE POWER SOURCE BEFORE
ATTEMPTING TO SERVICE OR REMOVE ANY COMPONENT.
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.
All wetted parts can be serviced by removing the (4) wing nuts (item 11) which hold the volute to the
housing. The pump head components can easily be replaced in the field if necessary.
Lightly clean any corrosion or debris which may clog the impeller.
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.
Be certain power cord is in good condition and contains no nicks or cuts.
MOTOR
RPM
PH.
H.P.
WATTS
60
1550
1
1/50
67
60
3000
1
1/25
126
NOTE: Motor configuration may vary from model to model.
SPECIFICATIONS
SHUT
MOTOR
MAX.
OFF
TYPE
PSI
HEAD
AMPS
1 FT.
(FT.)
.94
OPEN FC
3.0
7.0
5.8
1.65
OPEN FC
8.2
19.0
7.6
MFR'S
ITEM
PART
NO.
NO.
1
977314
1
977313
2
181411
3
181211
4
181311
5
180602
6
181111
6
181112
7
180058
8
921067
9
924007
10
901418
11
920003
12
901424
13
921059
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.
GALLONS PER MINUTE
3 FT.
6 FT.
9 FT.
12 FT.
HT.
5.0
3.3
–
–
5.13
7.0
6.8
6.0
5.0
5.13
PARTS LIST
PART DESCRIPTION
QTY.
MOTOR, 115V
1
MOTOR, 115V
1
MAGNET HOUSING BRACKET
1
VOLUTE
1
BACKPLATE SEPARATOR
1
DRIVE MAGNET ASSEMBLY
1
IMPELLER/MAGNET ASSEMBLY
1
IMPELLER/MAGNET ASSEMBLY
1
SHAFT
1
THRUST WASHER
2
O-RING
1
MACHINE SCREW, #8-32 X 1½"
4
WING NUT, #8-32
4
MACHINE SCREW, #8-32 X ½"
4
LOCK WASHER, #8
4
DIMENSIONS
WT.
PACKED
WD.
LG.
(LBS.)
3.75
7.63
6.2
3.75
8.38
7.0
MODEL & CATALOG NO.
3X-MDX
3-MDX
581030
581031
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