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an aquarium pump to a receptacle. The drip loop is the part of 
the cord below the level of the receptacle or the connector if an 
extension cord is used, to prevent water traveling along the cord 
and coming in contact with the receptacle. If the plug or receptacle 
does get wet, DO NOT unplug the cord. Disconnect the fuse or 
circuit breaker that supplies power to the pump, then unplug the 
cord and examine the receptacle for the presence of water.
Close supervision is necessary when any pump is used by or near 
children.
Always unplug the pump from the receptacle when not in use, 
before putting on or taking off parts, and before cleaning. Never 
yank cord to pull plug from receptacle. Grasp the plug and pull 
to disconnect.
Do not use the pump for other than intended use.
Do not install or store the pump where it will be exposed to the 
weather or to temperatures below freezing.
Make sure the pump is securely installed before operating it.
Read and observe all the important notices on the pump.
If an extension cord is necessary, a cord with a proper rating 
should be used. A cord rating for less amperes or watts than the 
pump rating may overheat. Care should be taken to arrange the 
cord so that it will not be tripped over or pulled.

ELECTRICAL CONNECTIONS

Check the pump label for proper voltage required. Do not connect 
to voltage other than that shown.
Ground the pump to minimize the possibility of electric shock. 
This pump uses a power cord with an equipment-grounding 
conductor and a grounding-type plug. The plug must be plugged 
into an receptacle that is installed and grounded in accordance 
with all appropriate codes and ordinances. This pump is for use 
on a normal 120 volt circuit and has a grounding plug that looks 
like the plug illustrated in Figure 2. This pump should not be used 
with a three to two grounding adaptor.

AQUARIUM APPLICATIONS

When using this pump for aquarium filter applications, refer 
to the instructions and owner’s manual supplied by the filter 
manufacturer.

OPERATION

  1.  The pump is completely preassembled and pretested from the 

factory.

  2. Use a thread sealer on all pipe connections and hand-tighten 

only.

 3. The pump is not self priming. It must be operated with the 

volute intake below the liquid level.

 4. This pump is not submersible. Operate the pump only in the 

in-line mode. DO NOT put the pump in liquid. Locate the pump 
in a well-ventilated area and away from where accidental water 
spillage would cause wetting of the pump.

 5. The weight of the pump must be supported adequately. 

DO NOT support the pump by the intake and discharge 
connections alone.

  6.  Do not allow the pump to run dry (without liquid). Heat buildup 

caused by friction will damage the pump parts when dry.

 7. 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 flexible vinyl tubing is used, a 
clamp can be used on the tubing to restrict the flow.

 8. If the pump will be idle for a long period, follow the cleaning 

instructions outlined in the next section. Do not let the pump 
freeze in the wintertime. This may cause cracking or distortion 
that may destroy the pump.

SERVICE INSTRUCTIONS

DISCONNECT THE PUMP FROM THE POWER SOURCE BEFORE 
ATTEMPTING TO SERVICE OR REMOVE ANY COMPONENT!
  1. Lubricate the motor sleeve bearings every six months with two 

to three drops of SAE 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 screws 

(Figure 3, item 12) that hold the volute to the housing. The 
pump head components can be replaced in the field if 
necessary.

 3. Lightly clean any corrosion or debris that may clog the 

impeller.

 4. If pump is tripping circuit breakers, a GFCI, or not operating 

properly after cleaning, return it to Little Giant or an authorized 
service center. DO NOT attempt repairs yourself.

2

Figure 2

Summary of Contents for Little Giant 1.5-MDQ-SC

Page 1: ...ized service facility for service or discard the pump Do not use to pump flammable or explosive fluids such as gasoline fuel oil kerosene etc Do not use in explosive atmospheres Pump should only be used with liquids compatible with pump component materials Do not handle pump with wet hands or when standing on a wet or damp surface or in water This pump is supplied with a grounding conductor and or...

Page 2: ...ump for aquarium filter applications refer to the instructions and owner s manual supplied by the filter manufacturer OPERATION 1 The pump is completely preassembled and pretested from the factory 2 Use a thread sealer on all pipe connections and hand tighten only 3 The pump is not self priming It must be operated with the volute intake below the liquid level 4 This pump is not submersible Operate...

Page 3: ...ket 1 3 901434 Screw machine 8 32 x 3 8 4 4 189023 Drive magnet 1 5 189047 Magnet housing 1 6 902443 Screw tapping 8 16 x 1 2 4 7 924134 O ring nitrile 1 8 921077 Thrust washer 2 9 189010 Impeller 1 10 189042 Shaft ceramic 1 11 189002 Volute 1 12 902443 Screw tapping 8 16 x 1 2 4 ...

Page 4: ...L BE LIMITED IN DURATION TO THE PERIODS OF THE EXPRESS WARRANTIES GIVEN ABOVE Warranty will be VOID if any of the following conditions are found 1 Sealed motor housing opened 2 Product connected to voltage other than indicated on nameplate 3 Cord cut off to a length less than three feet 4 Pump allowed to operate dry fluid supply cut off 5 Pump used to circulate anything other than fresh water ligh...

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