Model # 503603/3E-34N Official Little Giant pump

Here are the diagrams and repair parts for Official Little Giant 503603-3E-34N pump, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

Click a diagram to see the parts shown on that diagram.
In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

ALL PARTS

Showing 10 of 12 parts |

Replacement parts diagram

Pump volute gasket

Part #103601

The manufacturer no longer makes this part, and there's no substitute part

#1B

Replacement parts diagram

Pump volute

Part #103375

The manufacturer no longer makes this part, and there's no substitute part

Replacement parts diagram

Volute

Part #103330

The manufacturer no longer makes this part, and there's no substitute part

Replacement parts diagram

Impeller

Part #104435

The manufacturer no longer makes this part, and there's no substitute part

#2A

Replacement parts diagram

Snowblower impeller

Part #103437

The manufacturer no longer makes this part, and there's no substitute part

#4A

Replacement parts diagram

Backplate

Part #103501

The manufacturer no longer makes this part, and there's no substitute part

#5A

Replacement parts diagram

Pump intake screen

Part #102376

The manufacturer no longer makes this part, and there's no substitute part

Replacement parts diagram

Backplate

Part #103503

The manufacturer no longer makes this part, and there's no substitute part

Replacement parts diagram

Screen

Part #102909

The manufacturer no longer makes this part, and there's no substitute part

Replacement parts diagram

Screw

Part #902501

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas cooktops

Why won't my cooktop's gas burners ignite or spark?

Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure, lack of …

Why isn't my cooktop's gas burner heating properly?

Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, burner valve failure…

Why do my cooktop's spark igniters keep clicking?

Main causes: stuck burner igniter switch, wet igniter switch contacts, faulty spark module…

How to replace a spark igniter switch on a gas cooktop

Follow these step-by-step instructions to fix the surface burner ignition system on your gas cooktop by replacing the sp…

Repair difficulty

Time required

45 minutes or less

How to replace a spark module on a gas cooktop

No flame on your gas cooktop? Installing a new spark module could be the fix you need.…

Repair difficulty

Time required

30 minutes or less

Articles and videos for gas cooktops

How is cooking on an electric range different than cooking on a gas stove?

Model # 503603/3E-34N Official Little Giant pump

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Symptoms for gas cooktops

Why won't my cooktop's gas burners ignite or spark?

Why isn't my cooktop's gas burner heating properly?

Why do my cooktop's spark igniters keep clicking?

Repair guides for gas cooktops

How to replace a spark igniter switch on a gas cooktop

How to replace a spark module on a gas cooktop

Articles and videos for gas cooktops

How is cooking on an electric range different than cooking on a gas stove?

5 Holiday Cleaning Tasks Essential to Boosting Your Home’s Image

How to clean grates and burners on a gas cooktop video

Parts & More

Stay Connected

Quick links

Let us help you

More resources