Shop by Brand
Shop by Price

MOUNTFIELD S421 PD Petrol Lawn Mower

Our Price:  £299.00
List Price:  £369.00
Saving Of:  19%
(Inc. 20% VAT)(£249.17 Exc. VAT)


SPECIAL OFFER:  A free Oil SAE30 for 4 stroke machinery 1 litre is available when you order 1 item or more of selected products.

Maintaining your lawn doesn't get any easier than this Mountfield lawn mower.

This Mountfield S421HP lawn mower has the same features as the Mountfield S421PD lawn mower but with the added bonus of being a self propelled machine. This takes the pushing effort away from the operator.

Wonderfully easy to use

A simple pull on the clutch lever, and away you go. To stop the machine moving forward, simply let go of the clutch lever. It couldn't be any easier.

Superb performance

This machine is powered by a Mountfield 139cc engine, and with a cutting width of 41 cm / 16 inches, it can tackle lawns up to 30m x 30m. A large grass collector, which can hold up to 60 litres of grass clippings, means you can mow for longer periods of time without having to stop to empty the grass bag. The bag is easy to remove, empty and refit.

Versatile enough for a variety of finishes

The S421HP features Mountfield's 4 in 1 cutting system. This allows you to mulch, collect, rear or side discharge. Mulching recycles the grass clippings back into the lawn, saving you time and effort emptying the grass bag. The grass clippings that are recycled feed the soil and provide extra nutrients. You can also choose from 6 different heights of cut ranging from 25mm to 65 mm. The height of cut can be changed by a simple lever which is found on each individual wheel on the machine.


This machine comes with a 5 year warranty.

  • Engine brand: mountfield
  • Engine type: ST140 OHV
  • Engine capacity: 139 cc
  • Net power output: 2.2kW @ 2900rpm
  • Starting method: recoil
  • Transmission: single speed 3.7 km/h
  • Drive: self-propelled
  • Cutting width: 41 cm/ 16 inch
  • Cutting heights: 22- 65 mm (6 positions)
  • Cutting height adjustment: single lever
  • Roller: no 
  • Collecting: yes
  • Mulching: yes
  • Collector: canvas with hard top 60 litres
  • Chassis: steel
  • Fuel tank capacity: 0.75
  • Lawn size: 30m x 30m
  • Collapsible handles: hand wheel
  • Safety features: operator presence control
  • Included accessories: mulching plug & side discharge chute
  • Wheels: front 200 mm rear 200 mm 
  • Warranty: 5 years (terms and conditions apply)
  • dB(A) rating: 95
  • Weight: 28 kg

Power Source:  Petrol
Cutting Width:  41 cm
Important:  PLEASE NOTE: Lawn Mowers are delivered drained of their fuel and oil. Please ensure you fill them with the appropriate amount of fuel and oil before first use to avoid damaging your machine. Always refer to the operating manual.

Part Number:  S421 PD
SKU: M5-S421PD

Why choose us?

Garden Machinery Direct is a family run business with over 40 years experience in selling and servicing garden equipment. We're one of the biggest garden machinery retailers in the UK. Based in the Midlands, we're well placed to deliver products across the UK - though we do deliver internationally. We are main agents for all the biggest garden machinery brands, and have fantastic working relationships with world leading manufacturers.

Our goal is to offer customers top of the range garden machinery at discount prices, delivered direct to your door. Our friendly and professional staff are available by telephone or email to give expert advice on the equipment most suited to your needs or to answer any queries you may have. We also operate an efficient spare parts service, utilising the latest computer link-ups direct to manufacturers stocks.

All of the garden machinery we sell carries a manufacturers guarantee, supported by a nationwide network of authorised service dealers.

At Garden Machinery Direct we offer our customers the best deals and even better service.

Please feel free to contact us if you have any questions.

Be the first to Write a Review for this item!

  • All machinery is tested by the manufacturer's trained technicians
  • When carrying out servicing and repairs, only genuine Mountfield parts & spares are used to ensure quality

View the Mountfield brochure for more information.

Related Products
MOUNTFIELD S461RPD Petrol Lawn Mower

MOUNTFIELD S461RPD Petrol Lawn Mower£479.00   £439.00

Ideal for lawns up to 40m x 40m, the Mountfield S461RPD lawn mower is easy to use with a self propulsion system to make driving effortless.

MOUNTFIELD S421RPD Petrol Lawn Mower

MOUNTFIELD S421RPD Petrol Lawn Mower£379.00   £339.00

Mountfield's S421RPD is a great value 16 inch / 41 cm rear roller self propelled lawn mower with a 55 litre fabric grass collector.

MOUNTFIELD S421RHP Petrol Lawn Mower

MOUNTFIELD S421RHP Petrol Lawn Mower£339.00   £299.00

A 41cm / 16 inch cut hand propelled petrol lawn mower from Mountfield, complete with 55 litre grass bag and rear roller for the perfect striped finish.

MOUNTFIELD S421HP Petrol Lawn Mower

MOUNTFIELD S421HP Petrol Lawn Mower£279.00   £229.00

The petrol Mountfield S421HP is a great value 16 inch / 41cm push lawn mower, powered by a 139cc Mountfield ST140 OHV engine with a 60 litre fabric grass collector.

Garden Machinery Direct