Spring Tine Rotor Replacement Kit

Scarifier

Model No. 134-7561-Serial No. and Up

Safety

Safety and Instructional Decals

Graphic

Safety decals and instructions are easily visible to the operator and are located near any area of potential danger. Replace any decal that is damaged or missing.
decal134-7557

134-7557

  1. Tine at ground level
  2. Tine level above ground (mm)

Installation

Note: This kit is a replacement for the existing spring tine rotor that is included with Model 54610.

Preparing the Machine

  1. Shut off the engine, wait for all moving parts to stop, and allow the machine to cool.

  2. Disconnect the spark-plug wire from the spark plug (Figure 1).

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    Figure 1

    1. Spark-plug wire

Replacing the Shaft Assembly

Parts needed for this procedure:

Spring tine reel shaft assembly1
Height-of-cut (HOC) decal1

Warning

The blades and tines are sharp; contacting a blade or tine can result in serious personal injury.

Wear padded gloves when working with the shaft assembly.

The scarifier includes a blade shaft assembly for scarifying and a separate tine shaft assembly for aeration.

  1. Remove the hex wrench from the transport lever assembly (Figure 2).

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    Figure 2

    1. Hex wrench

  2. Using the hex wrench, remove the 2 screws securing the bearing housing and the reel shaft from the right side of the machine (Figure 3).

    Note: Retain all removed parts for later installation.

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    Figure 3

    1. Shaft assembly
    2. Bearing housing
    3. Hex-head screw

  3. Slide the other end of the shaft assembly out of the drive and replace with the desired shaft assembly (Figure 4).

    Important: You may discard the existing spring tine reel shaft assembly. Do not discard the blade shaft assembly.

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    Figure 4

    1. Shaft drive
    2. Existing reel shaft (spring tine shaft shown)

  4. Install the bearing housing so that it secures the newly installed shaft assembly using the 2 hex-head screws removed in step 3 and store the hex wrench in the transport lever assembly (Figure 3).

  5. Connect the spark-plug wire to the spark plug.

  6. Install the included HOC decal next to the existing HOC decal.

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    Figure 5

    1. Existing HOC decal
    2. Install decal 134-7557 here.

Operation

Operating Tips

  • Selecting the correct shaft assembly is necessary to ensure that the blade or tine components do not wear quickly and reduce the component lifetime.

    • The steel blade shaft assembly should be used on lawns with heavy or unmaintained thatch and moss.

    • The spring tine shaft assembly should be used on lawns that are regularly scarified and have a low amount of thatch & moss.

  • Begin by cutting the lawn to the lowest height of cut (HOC), to reduce load on the scarifier.

  • Select a HOC on the scarifier that produces an even and consistent amount of material/thatch.

    Important: The tine blades should be set so the tips just touch the ground surface. If the blades penetrate the ground excessively the machine will be overloaded, reducing the lifetime.

  • On heavy or unmaintained lawns, begin using the scarifier on a higher HOC to reduce load on the machine and increase the machine’s lifetime.

  • At the end of each run, lift the tines away from the ground to reduce surface wear.

  • A second pass should be made, at a diagonal angle to the first (approximately 30°).

  • Mow to clean up any debris.