This guide explains how to assemble the wheels and set the cutting height on your Challenge SLM32E-ZB electric lawnmower before first use.

A video walkthrough may also be available to support these instructions.


Quick Answer

To assemble your Challenge SLM32E-ZB lawnmower:

  • Select the required cutting height.
  • Fit each wheel to the chosen height position.
  • Tighten the silver wheel bolts clockwise.
  • Tighten the black wheel bolts anti-clockwise.
  • Ensure all four wheels are set to the same cutting height before using the mower.

Using different cutting heights on each wheel can affect cutting performance and mower stability.

Before You Begin

Before assembling your lawnmower:

  • Ensure the mower is switched off and unplugged from the mains supply.
  • Place the mower on a flat, stable surface.
  • Check that all components are present and undamaged.
  • Wear suitable personal protective equipment (PPE), including protective gloves.

Important: All four wheels must be fitted at the same cutting height before operating the lawnmower.

Steps

Step 1 – Select the Cutting Height

Choose the cutting height best suited to your lawn:

  • High (65mm) – Ideal for longer or overgrown grass.
  • Medium (45mm) – Suitable for regular mid-season mowing.
  • Low (25mm) – Provides the shortest cut for well-maintained lawns.

Select the same height setting for all four wheels.

Step 2 – Fit the Wheels

Locate the wheel fixing points on the mower deck.

On the side of the mower with the power cable outlet:

  • Fit the wheels using the silver bolts.
  • Tighten the bolts by turning them clockwise.

On the opposite side of the mower:

  • Fit the wheels using the black bolts.
  • Tighten the bolts by turning them anti-clockwise.

Ensure each wheel is securely fitted before moving to the next one.

Step 3 – Check the Wheel Height

Once all four wheels have been installed:

  • Confirm each wheel is set to the same cutting height.
  • Check that all bolts are fully tightened.
  • Ensure each wheel rotates freely.

Your lawnmower is now ready for use.

Frequently Asked Questions

Why do all four wheels need to be set to the same height?

Setting all four wheels to the same height ensures an even cut, stable operation and helps prevent scalping the lawn.

Which cutting height should I choose?

Use the 65mm setting for longer grass, 45mm for routine mowing and 25mm for a shorter finish on established lawns.

Why do the wheel bolts tighten in different directions?

The mower uses left-hand and right-hand threaded bolts to help prevent them from loosening during operation. Always tighten the silver bolts clockwise and the black bolts anti-clockwise.

Can I change the cutting height after assembly?

Yes. Ensure the mower is switched off and unplugged before adjusting the wheel positions. Always set all four wheels to the same height.

What should I do if a wheel feels loose?

Check that the wheel is fitted correctly and tighten the fixing bolt in the correct direction. Do not use the mower until all wheels are securely attached.

Is the lawnmower ready to use after fitting the wheels?

Yes. Once all four wheels are securely fitted at the same height and the mower has been inspected, it is ready for operation following the instructions in the user manual.