How to Replace the Main Pipe Assembly on an Echo Trimmer (Model SRM-225)

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The main pipe assembly consists of the metal pipe, the cable liner and the two rubber stoppers that secure the liner. While it is possible to replace these parts individually, it can be faster and simpler to replace the main pipe assembly as a whole.

This article provides step-by-step instructions for removing and installing the main pipe assembly on an Echo SRM-225 trimmer.

Let's get started.

  REMOVING THE MAIN PIPE [top] 1. Remove the control handle assembly.

Remove the (4) screws from the cover of the control handle assembly.

Remove the cover from the control handle assembly.

Remove the (2) screws from the clamps inside the control handle.

Remove the control handle assembly.

  2. Remove the gear housing and the shield assembly.

Remove the single alignment screw from the top of the gear housing.

Loosen the (2) clamp screws.

Twist the gear housing slightly while pulling the assembly away from the main pipe.

Remove the gear housing and the shield assembly from the unit.

  3. Remove the front handle.

Remove the (4) screws from the front handle assembly.

Remove the front handle assembly from the main pipe.

  4. Remove the main pipe from the engine.

Loosen the (2) clamp screws.

Slide the main pipe away from the engine.

Remove the two clamps from the main pipe.

  INSTALLING THE NEW PIPE [top] 5. Transfer the drive shaft to the new main pipe.

Slide the drive shaft out of the old pipe assembly.

Generously apply grease to the opening (at the gear housing-end) of the new main pipe. The idea is to apply enough grease to lubricate the length of the drive shaft as it slides through the opening.

Slide the drive shaft into the new main pipe.

  REASSEMBLING THE UNIT [top] 6. Pre-align the clamp rings.

Place the control handle assembly on a flat work surface (with the levers facing up).

Note that one side of each clamp ring features a small detent (curved bump); and one side is straight (and flat).

Place each clamp ring into the control handle assembly with the detents facing up.

Slide the main pipe through the two clamp rings (in the direction it would normally be installed).

Lift the main pipe (and the clamps) away from the control handle. (This will ensure that the clamps are properly aligned for installation (in subsequent steps).

  7. Reinstall the main pipe into the engine assembly.

Slide the main pipe (and drive shaft) into the engine assembly until the indicator marks on the pipe align with the holders.

Secure the engine to the main pipe with the (2) screws.

  8. Reinstall the front handle assembly.

Align the lower half of the handle assembly with the indicator marks on the main pipe.

Install the top half of the front handle assembly onto the lower half.

Secure the front handle assembly with the (4) screws.

  9. Reinstall the gear housing and shield assembly.

Slide the gear housing and shield assembly onto the end of the main pipe.

Rotate to gear housing assembly (if necessary) until the drive shaft engages the gearbox.

Align the hole in the top of the gear housing with the hole in the top of the main pipe.

Install and secure the single alignment screw.

Secure the (2) clamp screws.

  10. Reinstall the control handle assembly.

Use a screwdriver to tuck the ignition wires into the channels along the inside of the control handle.

Align the throttle cable with the grooves along the control handle (above the ignition wires).

Position the control handle assembly on the main pipe.

Align the metal ring clamps with the slots in the control handle assembly.

Install (but do not fully tighten) the (2) screws into the ring clamps.

Rotate the control handle assembly into alignment with the engine and the front handle.

Fully tighten the screws in the ring clamps to secure the control handle assembly.

  11. Reinstall the control handle assembly cover.

Install the cover onto the control handle assembly.

Secure the cover with the (4) screws.

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.

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