Mountfield HW531 PD 21″ Petrol Lawn Mower

Why buy the Mountfield HW531 PD 21″ Petrol Lawn Mower? Powered by a reliable and powerful 196cc STIGA ST 200 OHV petrol engine. Self-propelled rear-wheel drive system takes the effort out of mowing. Generous 53cm (21″) cutting width for efficient coverage of large lawns. Versatile 3-in-1 cutting: collect, mulch, or rear discharge clippings. Large 70-litre hybrid grass collector with ‘bag full’ indicator. Robust steel deck with large rear wheels, ideal for undulating ground. Powerful Performance for Large Lawns The Mountfield HW531 PD is a popular, high-specification self-propelled lawnmower, perfectly engineered for homeowners with large, undulating lawns. At its core is the powerful STIGA ST 200 OHV 196cc petrol engine, providing reliable power to both the cutting blade and the rear-wheel drive system. This self-propelled functionality means there’s no need to push; the mower moves forward at a steady 3.8 Km/h, making light work of slopes and rougher terrain. Efficient and Versatile Cutting Featuring an impressive 53cm cutting width, the HW531 PD covers more ground in less time, making it ideal for gardens up to 2000 m². The robust steel chassis, finished in classic Mountfield Red, houses a deep deck and a front comb, a combination that ensures a perfect cut every time. You have complete control over your lawn’s finish with a centralised cutting height adjustment lever, offering five positions from 25mm to 80mm. This mower offers superb versatility with its 3-in-1 cutting system. You can collect clippings in the spacious 70-litre hybrid textile collector, which features an indicator to warn you when it’s full. Alternatively, engage the rear discharge option for less formal areas, or use the supplied mulching plug. Mulching finely chops the clippings and returns them to the lawn, acting as a natural, nutrient-rich fertiliser. Designed for Durability and Convenience Built for longevity and ease of use, the HW531 PD features large 280mm rear wheels on ball bearings, providing smooth travel over uneven ground. The ergonomic handlebar includes cam locks and a soft grip for operator comfort, and it can be adjusted or folded for easier storage. Maintenance is simplified with the handy Snap-On hose connector (washing link), allowing you to clean the underside of the deck efficiently after each use. Buy From An Authorised Mountfield UK Dealer Purchasing a Mountfield lawnmower from an authorised dealer like Sims Garden Machinery ensures you receive a genuine product with a full UK warranty. As a family-run business with over 100 years of experience, we offer more than just a box. Our trained sales staff are available to offer expert advice at our Stratford-upon-Avon showroom, ensuring you choose the right machine for your needs. For local customers, this lawnmower will receive a comprehensive Pre-Delivery Inspection (PDI) from our trained mechanics, be delivered fully assembled, and you’ll receive a full handover demonstration to get you started safely and confidently. This level of service guarantees your new mower is ready to perform at its best from the moment it arrives. Not sure which machine or part is right for you? Our team is here to help. Contact us today for expert advice. Technical Specification Power Power Source Petrol Engine Brand STIGA Engine Model ST 200 OHV Autochoke Powered by STIGA Displacement 196 cm³ Power 3.2 kW Engine Rotation Speed 2900 rpm RPM Control Fixed rpm Starter Recoil Fuel Tank Capacity 1 l Engine Oil Tank Capacity 0.5 l Maximum Mowing Area 2000 ㎡ Cutting System Cutting Method Collecting, Mulching, Rear discharge Cutting Width 53 cm Deck Material Steel Cutting Height Adjustment Centralized Cutting Height Positions 5 positions Cutting Height Range 25 – 80 mm Drive System Driving Self-propelled Traction Rear-wheel drive Speed Forward 3.8 Km/h Equipment Collector Capacity 70 l Collector Type Hybrid with warn Handlebar Type Ergonomic with cam locks soft grip Wheels 200/280mm grooved wheels on ball bearings with soft tread Front Handle Yes Adjustable Handlebar Yes Foldable Handlebar Yes Washing Link Yes Vibration and Noise Data Guaranteed Sound Power Level (LwA) 98 dB(A) Measured Sound Pressure Level at Operator’s Ear 84 dB(A) Vibration Level Hand (m/s²) 7.5 Overall Dimensions Weight 36 kg Pack Weight 39.5 kg Product Length 1620 mm Product Width 730 mm Product Height 1260 mm Why buy from Sims Garden Machinery? Authorised main dealer We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on. Real people, real support No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help. Expert advice — not pushy sales Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine. Established, independent family business We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth. Frequently Asked Questions Who is the Mountfield HW531 PD lawn mower best for? The Mountfield HW531 PD is ideally suited for users with large gardens, up to approximately 2000 square metres. Its self-propelled drive system and large rear wheels make it particularly effective on uneven, sloping, or undulating ground where a push mower would be strenuous to use. What cutting options does this mower offer? This is a versatile 3-in-1 lawnmower. You can choose to (1) collect the grass clippings in the large 70-litre bag, (2) use the included mulching plug to finely chop and return the clippings to the lawn as a natural fertiliser, or (3) use the rear discharge flap for cutting longer grass in less formal areas. How do I clean the cutting deck after use? The HW531 PD features an integrated washing link. After mowing, you can connect a standard garden hose to this port. With the engine off and the blade disengaged, running the water while the mower is on a flat surface will efficiently clean the underside of the deck, preventing grass build-up and maintaining cutting performance. What is a Pre-Delivery Inspection (PDI) and why is it important? A Pre-Delivery Inspection is a service offered by authorised dealers like Sims Garden Machinery for local customers. Unlike buying a mower in a box from a large retailer, our trained mechanics assemble the machine, add the correct amounts of oil and fuel, and test it to ensure it’s running perfectly. This means you receive a machine that is safe, fully functional, and ready to use immediately, avoiding any assembly frustrations and ensuring the manufacturer’s warranty is validated. User Manuals / Downloads View Mountfield Brochure