POWEROLL - a power pack upgrade kit for Automower & T.H.White Auto-Rollers (AR3 & AR4)

Designed to replace the original engine, clutch and gearbox with
an easy to install, easy to operate, hydraulic drive unit.

The engine and gearbox fitted to the AR3/4 are fine when working correctly, however the majority of Auto-Rollers are elderly and very expensive to replace with similar components.
Even then, still not user friendly compared to new machinery. The bolt in upgrade kit from Poweroll consists of a new engine and hydraulic drive kit enabling a new lease of life for the old roller. This power pack enables your machine to start easily with a turn of the key, and is much more user friendly for the operator, even more so for the AR4 when the optional upgrade for power steering is selected.


An AR4 Auto-Roller in our workshop in the process of being rebuilt with a new engine/transmission kit.

This one is being fitted with a Honda petrol engine and power steering.

This particular AR4 Auto-Roller has already been through our workshop.

Completely dismantled, shot blast to bare metal and re-sprayed using the same 2 pack high quality paint applied to all new Poweroll roller.



  • Key start engine – no more pull cords or crank handles, (optional key start on the AR3)
  • Economical to use - engines run at low speed on the wicket
  • Low maintenance – oil based system – self-lubricating
  • Low minimal ground speed
  • Easy to operate, single lever control for direction and speed
  • Delivered on a pallet and ready to install. No pre-assembly

AR3 upgrade kit options:

  • Key start Honda engine

AR4 upgrade kit options:

  • Power steering (recommended) Honda engine increased to Honda GX390
  • Key start Hatz 1B40 Diesel engine

Specifications for both units:

  • AR3 kit uses a recoil start Honda GX200 engine as standard
  • AR4 kit uses a key start Honda GX340 engine as standard
  • Full size drip tray under the engine and main pump unit
  • Engine mounted onto anti-vibration mounts
  • Car size starter battery utilised for longevity
  • Gerotor type hydraulic motor

Most Auto-Roller parts are available from our extensive stock of traded-in Auto-rollers.
Please phone for more information.

Click here to download this as a printable brochure

POWER Precision & Fabrication Ltd

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