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Repair Center  How to Replace the Primer Bulb on an Echo Trimmer (Model SRM-225)

Why Read This Article?

Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)

Article Breakdown

Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)

Video

Tools & Materials

Fix Factor: Easy Duration: 15 minutes Frequency: As necessary Tools Required: Receptacle for draining fuel, 10mm wrench, Torx wrench, Phillip's screwdriver Part #: 12538108660

How to Replace the Primer Bulb on an Echo Trimmer (Model SRM-225)

Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)
how to replace the primer bulb on an echo trimmer The Facts

Primer bulb past its prime? It's time to face the fix. Whether you are a legendary landscaper or a weekend weed whacker, eReplacementParts.com provides the parts, procedures and facts you need to fearlessly fix what fails you.

The primer bulb (also known as the purge bulb) is part of your trimmer's carburetor. Its purpose is to prime the engine for starting by pumping fuel into the carburetor. This also removes air from the carburetor, which helps the engine start more quickly and easily.

Over time, the primer bulb may begin to deteriorate or crack. Fortunately, replacing the primer bulb is very easy to do. This article provides step-by-step instructions for removing and installing the primer bulb on an Echo SRM-225 trimmer.

Let's get started.

The Fix   REMOVING THE PRIMER BULB [top] 1. Remove the air cleaner assembly.

Loosen the thumb screw.

Remove the thumbscrew

 

 

Remove the air cleaner lid.

Remove the lid

 

 

Remove the air filter.

Remove the air filter

 

 

  2. Drain the fuel.

Drain the fuel before servicing the unit.

Drain the fuel

 

 

  3. Remove the air cleaner case.

Loosen the (2) bracket retaining screws.

Remove the screws

 

 

Remove the air cleaner case (along with the bracket and the screws) from the engine.

Remove the case

 

 

  4. Remove the carburetor.

Use a wrench to loosen the throttle cable adjusting nut.

Loosen the throttle nut

 

 

Disconnect the throttle cable from the throttle body.

Remove the cable

 

 

Disconnect the (2) fuel lines from the carburetor.

Remove the fuel lines

 

 

Remove the carburetor from the engine.

Remove the carburetor

 

 

Locate and remove the intake insulator gasket. (This gasket is situated between the carburetor and the intake insulator block. Typically, the gasket will fall away from the two components as they are separated. Sometimes, the gasket will remain affixed to either the carburetor or the intake insulator block.)

Remove the gasket

 

 

  5. Remove the primer bulb.

Remove the (4) screws from the primer pump cover.

Remove the screws

 

 

Remove the primer pump cover.

Install the primer bulb

 

 

Remove the primer bulb.

Remove the primer bulb

 

    INSTALLING THE NEW PRIMER BULB [top] 6. Install the primer bulb.

Install the new primer bulb onto the purge base assembly.

Remove the primer bulb

 

 

Install the primer pump cover over the primer bulb.

Install the primer plate

 

 

Secure the primer pump cover and the new bulb with the (4) screws.

Secure the primer cover plate

 

 

  REASSEMBLING THE UNIT [top] 7. Reconnect the fuel lines to the carburetor.

Remove the gas cap and locate the fuel filter. The filter will be attached to the INCOMING fuel line. Make note of this fuel line for use in the next step.

Remove the fuel cap

 

 

Plug either one of the carburetor ports with the tip of your finger; depress the primer bulb several times. If the primer bulb softens (deflates) without returning to its original shape; you have plugged (and identified) the incoming port.

Identify the incoming port

 

 

If the primer bulb fills with air (hardens) and won’t allow further priming; you have plugged (and identified) the RETURN port.

Identify the return port

 

 

Connect the INCOMING fuel line to the INTAKE port on the carburetor.

Connect incoming line

 

 

Connect the RETURN fuel line to the RETURN port on the carburetor.

Connect the return line

 

 

  8. Reinstall the throttle cable to the carburetor.

Rotate the throttle lever on the carburetor to fully open the throttle.

Rotate the throttle lever

 

 

Thread the throttle cable through the brass connector on the top of the carburetor.

thread the cable

 

 

Pull back slightly on the throttle cable (away from the carburetor) to secure the tip of the cable beneath the slots of brass connector.

Tighten the cable

 

 

Press the throttle adjustment nut (on the cable) into the recess on the throttle body.

Install the cable nut

 

 

Use a wrench to secure the secondary throttle nut.

Secure the cable nut

 

 

  9. Reinstall the carburetor.

Thread the (2) mounting screws through the mounting holes on the air cleaner bracket and the air cleaner case. The bracket should be flush against the interior of the air cleaner case (on the same side as the choke valve).

Thread the mounting screws

 

 

Thread the screws (protruding from the air cleaner case) through the holes on the carburetor assembly.

Install the carburetor

 

 

Note that there are two small holes on the intake gasket (besides the main intake opening and the two mounting holes). These small holes need to align with the small hole on the insulator block.

Note the intake holes

 

 

Thread the screws through the mounting holes on the intake gasket and slide the gasket flush against the carburetor.

Install the gasket

 

 

Install the intake assembly (bracket, air cleaner case, carburetor and intake gasket) onto the intake insulator block.

Install the intake

 

 

Secure the intake components (bracket, air cleaner case, carburetor and intake gasket) with the screws.

Secure the intake

 

 

  10. Reinstall the air filter.

Install the air filter into the air cleaner case.

Install the air filter

 

 

  11. Reinstall the air filter lid.

Install the air filter lid onto the air cleaner case.

Install the air cleaner lid

 

 

Secure the air filter lid with the thumbscrew.

Secure the thumbscrew

  The Finish

You don't have to leverage your savings to level your lawns. As you just learned, repairing your own equipment is easy when you follow our step-by-step guides. Not only did you restore trimmer functionality at a fraction of the cost of replacement; you have taken the edge off of future repairs, wherever you may find them.

Find your next fix here.   [top]

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