Mountfield spare parts: how to find the right one for your machine

How to find the right Mountfield spare part for your machine

You've got a Mountfield that needs a part. Maybe the blade is blunt, the recoil rope has snapped, the drive has stopped pulling, or the engine won't fire. You've walked out to the machine, peered at the model number on the side, and now you're sitting in front of a screen worrying that if you order the wrong part, you'll have wasted time and money and you'll still have a broken mower.

That worry isn't unfounded. Mountfield has been making garden machinery in one form or another since 1962. Across that time the brand has produced dozens of model families, hundreds of individual models, and thousands of production variations. A part that fits an SP46 from 2013 might not fit an SP46 from 2016. That's not because Mountfield is difficult. It's because every time the manufacturer improves a machine, the parts change slightly to match.

There is a system that prevents you ordering the wrong thing. It's the system Mountfield itself uses, and once you know how it works it's fairly simple. This guide walks you through it, machine type by machine type, and tells you what to do if any of it feels uncertain.

If at any point you'd rather just send us a photo and let us find the part for you, that option is free. You'll see it referenced throughout this article. The Contact Us button at the bottom of every page on the site is how you reach us.

What's the first thing to find on your Mountfield machine?

The single most useful piece of information on any Mountfield machine is the Art.N, short for Article Number. Every Mountfield has an ID sticker somewhere on the body, usually a small adhesive label with several lines of text and numbers. The Art.N is one of those lines. It looks something like 2L0482048/M21.

On some machines the sticker also shows a separate serial number alongside the Art.N. Both are useful, but the Art.N is the one to look for first.

This number is the key to everything. The model name (for example "SP46") tells you the family: a 46cm self-propelled petrol rotary mower. But Mountfield has produced the SP46 across multiple years, with multiple engine variants, with small specification changes between production runs. Each production run gets its own Art.N.

So if you take just the model name to a parts catalogue, you might be looking at three or four sets of parts diagrams and wondering which one matches your machine. If you take the Art.N, there's only one set of diagrams that applies, and the part you order from those diagrams will fit.

Where to find the ID sticker

The location of the ID sticker varies by machine type. Here's where to look on the most common Mountfield categories:

Petrol rotary mowers (SP, HP, M, R-series): Typically on the deck, near the rear, or sometimes under the handlebar. Some are on the underside of the deck. Tip the mower carefully to look.

Lawn tractors and ride-on mowers (1430H, 1538, T-series, R-series, 3000SH, 3600SH): Usually on the frame under the seat, or on a panel near the steering column. You may need to lift the seat to see it clearly.

Battery and electric machines: Often on the underside of the housing, or on a rear panel. On battery chainsaws and brushcutters, look around the motor housing.

Handheld petrol kit (chainsaws, brushcutters, hedgetrimmers, blowers, blower/vacs): On the motor housing itself, sometimes under a removable cover.

Older MP-series mowers (1980s and 1990s): On a metal plate riveted to the deck or chassis.

What if the ID sticker is worn off or missing?

It happens. Mountfield machines often live in damp sheds, get dragged across rough ground, and the stickers can degrade over time. If yours is unreadable, you have a couple of options.

First, check the metal directly under or near where the sticker should be. Some Mountfield models have the production number stamped into the metalwork as well.

Second, if you genuinely can't find it, click the Contact Us button at the bottom of any page on this site and send us a photo of the machine, including any visible numbers or labels you can find. Tell us what you remember: when you bought it, roughly what it cost, where from. Often we can identify the production run from a photo and a few details.

Why Mountfield parts are interchangeable with Stiga, Alpina, ATCO and Castel

This is the section that surprises most Mountfield owners, and it's worth understanding because it can save you time and money.

Mountfield is owned by STIGA Group, a European garden machinery manufacturer headquartered in Castelfranco Veneto, Italy. STIGA Group also owns Stiga, Alpina, ATCO and Castel (the brand sometimes also sold as Twincut or Lawnking). All five brands are designed and manufactured under the same corporate roof, in the same factories, by the same engineering teams.

Between 2000 and 2017 the group was called GGP (Global Garden Products). In 2017 it was renamed STIGA Group. If you've ever seen "GGP" stamped on a Mountfield engine or a parts diagram, that's why. The history of the corporate group is covered in more depth in our Stiga history blog post if you're curious.

What this means in practice: many parts on Mountfield machines are physically identical to parts on Stiga, Alpina and Castel machines. Same blade, same spark plug, same drive cable, same starter motor, sometimes even the same engine. The badge changes; the part doesn't.

Three concrete examples from our own stock:

The Champion RC12YC spark plug (part 9400-0244-00, around £5) fits the Stiga Primo, three Alpina mowers (C92G, A92HG, A102HG), and eleven different Mountfield models: the S461PD, S421PD, S421HP, MULTICLIP501-HP, S464PD, S461R-PD-ES, S461R-PD, S461R-HP, S461HP, R25M ride-on, R25V ride-on, and the 1430H lawn tractor, among others. The same part also fits multiple Castel/Twincut/Lawnking TRE-series and WBE-series machines.

The GGP RS100 Blue OHV engine (part 118563103/0, around £300) is sold on this site twice: once under Mountfield and once under Stiga. Same engine, same part number, same price. Two SKUs because the engine ships into both brands.

The starter motor 118550214/0 fits the Stiga Primo, the Alpina C92G / A92HG / A102HG range, Mountfield 1538H-SD / 1538M-SD / 1430H lawn tractors, and Castel TRE0701 / TRE0702 / TRE0801 ride-ons.

You'll even find Mountfield-branded protective kit on the site, like the Mountfield Stiga Helmet and the Mountfield Stiga Forestal Jacket, where the dual branding makes the relationship visible on the label.

Why this matters for the buyer: if you've got a Mountfield model number that's tricky to track down, or you're seeing a part listed under "Stiga" or "Castel" and wondering if it'll fit, the answer is often yes. The Find My Part service handles all of this. We'll tell you whether a given part is interchangeable or not, and order the right one for you.

If you want to browse the related brands directly, the Stiga, Alpina, ATCO and Castel/Twincut/Lawnking brand hubs are all on the site.

How to find parts for your specific type of Mountfield machine

Mountfield's range is broad. Petrol mowers from 41cm to 53cm cutting widths, ride-on lawn tractors, battery-powered everything, electric corded entry-level kit, cylinder mowers, handheld chainsaws and brushcutters, robot mowers, snow throwers, scarifiers and cultivators. This section walks through each category, tells you which model families belong in it, and points you to the right group page to browse parts.

If at any point you're not sure which category your machine belongs to, scroll down to the Find My Part service section, or just click the Contact Us button now.

Petrol rotary mowers (SP, HP, M, R-series)

By volume this is the largest part of the Mountfield range. The walk-behind self-propelled and push petrol mowers most UK gardens have had at some point.

Model families include:

  • SP-series: self-propelled. SP41, SP46, SP414, SP454, SP464, SP533. The number usually refers to the cutting width in centimetres.
  • HP-series: hand-propelled (push). HP41, HP42R, HP45, HP46, HP164, HP414, HP180R, HP46R.
  • M-series: the most recent generation. M3, M5, M6, M150, M411.
  • R-series: typically a roller-equipped variant. R25M, R25V, R27H, R27M, RM45.
  • MANOR COMPACT and MOLEMASTER: model lines often sold through specific retailers.
  • The 827H and 827M: slightly older line, still well-supported for parts.

Engines in this category are usually a Mountfield-branded engine (the RS100 OHV, the Series 150 engines RV150 / M150 / SV150) or a Briggs & Stratton engine. If you've got a Briggs & Stratton-engined Mountfield, our separate Briggs & Stratton engine identification guide shows you how to read the engine numbers. Those are different from the machine's Art.N and you may need both to order the right engine part.

Most commonly replaced parts for petrol rotary mowers: blade, spark plug, drive cable (for the self-propelled SP-series), recoil starter rope and spring, air filter, fuel filter, and other fuel system parts like the fuel tap and primer bulb.

Browse Mountfield petrol rotary mower parts or send us a photo via the Contact Us button if you're not sure which model you have.

Petrol rotary roller mowers

A close cousin of the petrol rotary mowers, but with a rear roller for that traditional striped-lawn finish. Models in this category include the 461R-HP, 461R-PD, R27H and R27M.

Same engine family as the petrol rotary mowers (Mountfield RS100, Series 150, or Briggs & Stratton). The roller itself is the distinctive part. Rollers do wear out over time, particularly the bearings and the drive components.

Browse petrol rotary roller mower parts.

Lawn tractors and ride-on mowers

The serious end of the Mountfield range. Ride-on lawn tractors are higher-value machines, and the parts are correspondingly higher-value: transmissions, transaxles, cutter decks, starter batteries, alternators, full electrical looms.

Model families include:

  • 1200-series: 1228H, 1228M
  • 1300-series: 1330M
  • 1400-series: 1430, 1430H, 1436H, 1436M
  • 1500-series: 1530H, 1530M, 1538-SD, 1538H-SD, 1538M-SD, 1538M-SDX, 1538H-SDX
  • T-series: T30M, T38SD, T38M-SD
  • 3000-series: 3000SH, 3600SH
  • R-series rideons: R25M, R25V

Cross-brand interchangeability is particularly strong in this category. The same engine, transmission and transaxle parts often appear on Stiga Park, Stiga Estate, Stiga Senator, Alpina One, and Alpina A-series and C-series tractors. The spring part 125430213/0, for example, fits 14 different Mountfield ride-on models plus a long list of Stiga Estate, Alpina and Castel tractors.

Electrical parts are also a significant part of this category. Starter batteries (typically 12V), alternators, ignition switches, safety microswitches, and wiring looms all wear and fail with age. If your tractor turns over slowly, doesn't crank at all, or has intermittent electrical faults, the part is almost certainly available.

Two related group pages on the site:

The Transmissions group is also worth knowing about if your gearbox or hydrostatic drive has failed.

Battery-powered mowers and tools

The newest section of the Mountfield range. Battery technology has come on dramatically, and the current Mountfield battery line-up includes:

  • Battery rotary mowers: walk-behind cordless petrol replacements
  • Battery lawn tractors: full-size cordless ride-ons
  • Battery chainsaws: the lighter-weight handheld option
  • Battery hedge trimmers, brushcutters, and other handheld tools

Common replacement parts: battery packs, chargers, blades, deck assemblies, switches, safety keys. Battery and charger fitments are particularly worth double-checking. The Mountfield battery platform has evolved across generations and not all batteries are interchangeable with all machines.

Browse parts by category:

Electric corded mowers and the B&Q range

Entry-level Mountfield machines: the corded electric mowers, electric hedge trimmers, and electric chainsaws. Many of these are sold through B&Q under the Mountfield brand, which is why the site has a dedicated B&Q Machines parts group.

The B&Q-channel Mountfield machines are genuine Mountfields with the same OEM parts source as the dealer-channel range. They sometimes use slightly different specifications, which is why they're grouped separately for parts identification, but the parts themselves come from the same supply chain.

Related group pages:

Petrol chainsaws, brushcutters, hedgetrimmers, blowers and blower/vacs

The handheld petrol range. Smaller engines, two-stroke or four-stroke depending on the model, and a tighter parts inventory dominated by consumables (chains, bars, trimmer line, blades) and engine wear items (spark plugs, recoil starters, primer bulbs, fuel lines).

Model families include:

  • MC-series chainsaws: MC 340T, MC 363, MC 382, MC 443, MC 509
  • MB and MT brushcutters: MB 22CX, MT 22CX
  • MBL blowers and blower/vacs: MBL 260H and related models
  • Various hedgetrimmer models in the MJ and MM series

Cross-brand interchangeability is significant here. The Champion RCJ7Y spark plug (part 3210024) fits the entire MC-series chainsaw range, the MB and MT brushcutters, the MBL blower, plus Stiga SP510, SP370, SP420, SB22 and several Castel XB-series machines.

Browse:

Cylinder mowers and the Series 150 / Series WBE ranges

Three related categories worth mentioning together.

Cylinder mowers: the traditional reel-type mowers, less common than rotary but still in service in many UK gardens. Parts include cylinders, bottom blades, drive components.

Series 150 engines: the Mountfield small-engine family. Includes the RV150, M150 and SV150. These are the engines fitted to many of the HP and SP series petrol mowers from roughly the mid-2010s onwards. If you need a spark plug, carburettor, recoil starter, fuel tank or any internal engine component for a Series 150 engine, this is your group.

Series WBE: a specific Mountfield engine and transmission family, shared with several Castel/Twincut/Lawnking ride-on and lawn tractor models (WBE0701, WBE0702, WBE0704 and variants).

Robot mowers

Battery-powered robotic lawn mowers. The Mountfield robot range is smaller than the rest of the lineup, with fewer parts overall. The parts that do wear are concentrated in a few areas: cutting blades, wheels, charging stations, perimeter wire connectors, and the various sensors that let the machine navigate.

Browse Robot Mower parts.

Cultivators, tillers, snow throwers, scarifiers, shredder/chippers

Seasonal kit. Less frequently bought, but stocked nonetheless. If you've got a Mountfield rotavator, scarifier, leaf shredder or snow thrower, the relevant group pages are:

Older Mountfield machines from the 1980s and 1990s

If you've got a Mountfield that's been in the shed for decades (and plenty of people do), the parts are very likely still available. We hold machine parts diagrams going back to 1988.

The MP Prefix Mowers pre-Year 2000 group covers the older range. Models include the MP81301 (production date 01-1988), the MP83706 (01-1991) and many more from the era when Mountfield was still British-owned and built in Maidenhead.

A few notes on older machines:

  • Some parts have been superseded. Mountfield has replaced the original part number with an updated equivalent. The new part fits and works the same. We'll tell you when this is the case.
  • Some parts are obsolete, no longer manufactured. Where a direct replacement isn't available, we'll often suggest a compatible alternative or refer you to a specialist.
  • The diagrams from the 1980s and 1990s can be hand-drawn or photocopied originals. They're not always pretty, but they're accurate.

If you've got an older Mountfield and you're unsure whether parts are still available, send us a photo via the Contact Us button. We've identified parts for machines older than some of the staff.

The five Mountfield parts most owners need at some point

Every Mountfield owner will, eventually, need most of these. They're the parts that wear out from normal use: not faults, just consumables and service items.

1. Replacement blades

Mower blades wear down from normal cutting and dull rapidly if the lawn contains stones, twigs, dog toys or anything else the previous-owner-of-the-garden has forgotten about. Sharpening extends their life. You can do this yourself with a file, or have a dealer do it. But eventually the blade is too thin or too pitted to sharpen safely, and replacement is the only option.

Mountfield blade fitments vary by deck size: typically 41cm, 46cm, 51cm and 53cm for the walk-behind range, and various widths for the ride-on cutter decks. An example part is the Mountfield Mulching Blade 46cm (part 181004460/0).

If you're not sure which blade fits your machine, send us a photo of the deck and the ID sticker.

2. Spark plugs

The single most commonly replaced service part. Spark plugs should be replaced annually as part of a normal service schedule, or sooner if you've had starting problems.

Different Mountfield engines need different plugs. A short reference:

  • Champion RC12YC (part 9400-0244-00): fits many of the larger Mountfield petrol mowers and ride-ons (S-series, R-series ride-ons, 1228H, 1430H, 1436H, 1436M).
  • Champion QJ19LM (part 118550134/0): fits the Series 150 engines (RV150, M150, SV150) and several HP and PD-series mowers.
  • Champion K7RTC (part 118550658/0): fits a long list of HP-series and SP-series machines, plus the Manor Compact and Molemaster range.
  • Champion RCJ7Y (part 3210024): fits the handheld petrol kit (MC-series chainsaws, MB and MT brushcutters, MBL blower).

If your engine is a Briggs & Stratton, the plug is determined by the engine code rather than the machine model. See the Briggs & Stratton engine identification guide for how to read those numbers.

3. Drive cables, clutch cables and belts

Petrol self-propelled mowers (the SP-series) have a drive cable that runs from the handlebar control to the wheel-engagement clutch. Pull the bail to engage drive; release it to stop. Over time the cable stretches, the inner wire frays, or the outer sheath splits, and the mower stops self-propelling.

Clutch cables on ride-ons and walk-behinds with a blade-engagement clutch work in similar ways and wear in similar patterns. Both types of cable are model-specific. The cable for an SP46 from 2013 is not the same as the cable for an SP46 from 2016. This is where the Art.N matters most.

Belts on ride-on mowers and lawn tractors wear in the same way. PTO belts (the ones driving the cutter deck) tend to go first, followed by the main drive belts. Annual inspection extends their life; eventual replacement is unavoidable.

4. Air filters, fuel filters and maintenance kits

Routine service items. Both should be checked annually and replaced when contaminated or damaged. A clogged air filter robs the engine of power and increases fuel consumption; a clogged fuel filter starves the carburettor and causes intermittent running.

The simplest way to handle these is to buy a maintenance kit (sometimes called an engine service kit), which bundles the air filter, fuel filter, spark plug and sometimes oil into a single product. The site's Engine Service Kits category holds the relevant kits, including kits specifically labelled for Mountfield, Stiga and GGP engines.

5. Recoil starter ropes and springs

The pull-start mechanism on a petrol mower is one of the most-used parts of the machine. Pull the rope a hundred times a season, every season, for ten years, and eventually something snaps. Usually it's the rope itself. Sometimes it's the recoil spring inside the housing.

Both are inexpensive parts. The frustration is that until they're replaced, the mower won't start, and a non-starting mower is essentially a piece of garden sculpture.

Browse:

The Mountfield Find My Part service: how it works

If anything in this article has felt uncertain (if your machine doesn't fit cleanly into any of the categories above, if the ID sticker is missing, if you've found a part on the site that looks right but you want to double-check before ordering), this is the service you want.

It's free, it covers Mountfield and the related STIGA Group brands (Stiga, Alpina, ATCO, Castel), and it's available to anyone whether they've bought from us before or not.

Here's how it works:

  1. Find the ID sticker on your machine. If it's there, photograph it. If it's missing or unreadable, photograph the machine from a couple of angles instead, including any visible model markings.
  2. Click the Contact Us button at the bottom of any page on this site.
  3. Send the photos along with a description of the part you need. The more detail the better: "the drive isn't engaging," "the blade is chipped," "the spark plug looks like this," "the rope won't pull out." Photos of the broken part itself are very helpful.
  4. We reply with the correct genuine OEM part for your machine, a link to order it, and any relevant notes (for example, "this part has been superseded; the new equivalent is X").

A few things worth knowing:

  • We sell genuine OEM spare parts only: no aftermarket copies, no unbranded equivalents. The part you receive is the part the manufacturer would supply to a dealer.
  • We ship worldwide from our warehouse in Shaftesbury, Dorset, on a tracked service. The site is regularly used by Mountfield owners in the US, Canada, Australia, New Zealand, Ireland and across Europe, wherever Mountfield has been sold.
  • The team has been working with STIGA Group brand parts since the company was founded in 2012. Mountfield, Stiga, Alpina, ATCO and Castel are core to what we do.

If you'd rather work it out yourself first, our 80+ Help/Advice guides cover most of the common questions: model identification, engine identification, service intervals, and quick reference guides for the various parts categories.

Common questions Mountfield owners ask

How old is my Mountfield, and can I still get parts for it?

You can usually still get parts. Our parts diagrams go back to 1988, covering the MP81301 from January 1988 onwards. Some specific parts on the very oldest machines have been discontinued by the manufacturer, but in many cases an equivalent or superseded part is available.

If your machine has a production year visible on the ID sticker, that's the easiest way to confirm parts availability. If it doesn't, send us a photo of the machine and we'll tell you what's available.

My Mountfield was bought from B&Q. Are the parts different?

The machines themselves are genuine Mountfields, made by the same manufacturer as the dealer-channel range. They sometimes use slightly different specifications, which is why we keep them in a separate B&Q Machines parts group for clarity. Parts source and quality are the same.

Where are Mountfield mowers made?

Mountfield was founded in 1962 in Maidenhead, Berkshire, and was British-owned and British-made for decades. In 2000 the brand was acquired by Castelgarden SpA, which subsequently formed GGP (Global Garden Products) by combining Stiga, Alpina, Castelgarden and Mountfield. GGP was renamed STIGA Group in 2017.

Today most petrol Mountfield mowers are manufactured in Poprad, Slovakia, at STIGA Group's primary production facility. Higher-end ride-on mowers and lawn tractors are built at the company's Italian facilities near the headquarters in Castelfranco Veneto. Some entry-level electric models and components are produced in China. All machines are tested to European quality, safety and emissions standards before release.

Are Mountfield parts the same as Stiga parts?

In many cases, yes. The two brands share the same parent company (STIGA Group), share many of the same factories and engineering teams, and consequently share a great many physical parts. Spark plugs, starter motors, springs, blades, engines, electrical components: large numbers of these are identical across the two brands.

This is covered in detail in the cross-brand interchangeability section above. If you're holding a part number and trying to work out whether it's Mountfield or Stiga, send us the number. Often it's both.

What's the difference between Art.N, model number and serial number?

The model number identifies the machine family. For example, "SP46" is a 46cm self-propelled petrol rotary mower. There may be five or six different production runs of the SP46 across the years.

The Art.N (Article Number) identifies the specific production run. For example, 2L0482048/M21 is one particular version of the SP46. Each production run gets its own Art.N, and the parts diagrams for that production run are unique.

The serial number identifies the individual machine within a production run. It's useful for warranty and service records, but for ordering parts the Art.N is what matters most.

When ordering parts, the Art.N is what you want. The model number alone is sometimes enough, but only if your model has had a single production run, which is rare on machines that have been in the range for several years.

Do you ship Mountfield parts outside the UK?

Yes. We ship worldwide on a tracked service, excluding sanctioned territories. The site is set up for international ordering, and we regularly send Mountfield parts to the US, Canada, Australia, New Zealand, South Africa, Ireland and across Europe.

Shipping rates and delivery times vary by destination. They're calculated at checkout once you've added a part to the basket and entered your delivery address.

What if I'm still not sure which part I need?

Click the Contact Us button at the bottom of any page on this site, send us a photo of your machine's ID sticker and a description of the part you need, and we'll find it for you. Free of charge, no obligation, and no requirement to have bought from us before.

Putting it all together

The whole reason this article exists is to remove the anxiety of ordering the wrong part. Mountfield's parts system is more logical than it first looks. Once you know that the Art.N pinpoints the exact production run, and that the same engines and components run across the wider STIGA Group brands, finding the right part for your machine becomes a fairly contained problem.

To recap the route:

  1. Find the Art.N on your machine's ID sticker.
  2. Use the Art.N to pinpoint the exact production run via the interactive parts diagrams on this site.
  3. Browse the parts that fit your specific production run.
  4. If anything's uncertain (missing sticker, unfamiliar model, part listed under a different brand), click the Contact Us button at the bottom of any page and send us a photo. We'll find the right part for you, free of charge.

The 80+ Help/Advice guides cover the common questions. The interactive diagrams cover the common machines. The Find My Part service covers everything else.

Most Mountfield problems are fixable. Most parts are still available. And most of the worry about ordering the wrong thing goes away once you know the system.

If you're ready to find your part, the Contact Us button is at the bottom of every page on the site, including this one.