Cracked or Shaking? Replacement Mirrors for Tractors and Plant

A cracked lens or a mirror that shakes until it is useless leaves you reversing half-blind. Match the replacement to your arm diameter and the class of the old mirror, then fix whatever broke or loosened it.

The Mirror range at PartsForMachines covers 88 Ashtree mirror part numbers, from main and wide-angle heads to interior and safety mirrors.

Cracked Mirror: Replace the Glass or the Whole Head?

In most cases, fit a complete new head. It clamps straight onto your existing arm, so you only need to match the class, the size and the arm diameter, and seized glass fixings stop being a problem. A separate glass is only worth hunting for if one is made for your exact head.

If hedges, loader arms or buildings keep breaking the glass, switch to an unbreakable lens. An unbreakable main mirror such as the MX450CEB is built to resist branches and loader arms, and suits machines where broken glass keeps coming back.

Why Does My Mirror Keep Shaking, and How Do I Stop It?

Shaking comes from a mounting that can move, so make it solid first. Set the arm at the angle you need, tighten the bracket bolt so the mirror has a stable base, and make sure the head’s clamps are tight on the arm. Check, too, that the head is made for your arm size (see below).

If the arm itself has gone floppy, replace it. Arms and brackets are sold separately, and an arm such as the S1090 can often replace the original if its length, diameter and mounting points match. Alternatively, fit a head supplied with its own 210mm arm and bracket, such as the M5000CEA4.

Will a New Mirror Head Fit My Existing Arm?

Yes, if its clamp range covers your arm, so measure the arm’s diameter before you order. Most main and wide-angle heads clamp onto 10–20mm or 16–28mm arms, and several come in a version for each: the M440CE main mirror fits 10–20mm arms, while the M440CEB, the same 162mm x 245mm head, fits 16–28mm.

Some interior and safety mirrors fix differently: by an M6 or 3/8 UNC stud, a 19mm stem, an M6 slot bracket or a 25–42mm fitting. Whichever you choose, offer the head up on a skid steer or compact tractor before drilling, so it won’t block the door or step.

Main, Wide-Angle or Both: Which Mirror Class Do I Need?

Match the class marked on the mirror you are replacing. The classes are defined in UNECE Regulation No 46: Classes II and III are main exterior rear-view mirrors, Class IV is wide-angle, Class V close-proximity and Class VI a front mirror.

A main mirror such as the M555CE gives the rearward view of traffic, trailers and implements. A Class IV head such as the M455CE covers blind spots, for example at the cab’s nearside or front corner. If there is room for only one head, a twin-lens head such as the M926CE does both, with main and wide-angle lenses in one 184mm x 384mm housing rated Class II, III and IV.

What Should I Check Before I Order?

• the class of the mirror you are replacing (II to VI) and any machine maker’s part number, on it or in your parts book
• the head size and lens radius, for example 162mm x 245mm at 1,200mm
• your arm diameter, or the stud or bracket the mirror fixes to
• standard glass or an unbreakable lens, and a standard or yellow housing
• for a heated or powered head, the voltage and the connector

Browse the Mirror range, or contact the PartsForMachines team by WhatsApp, telephone or email with the old part number, a photo of the head and your arm diameter.

Product options, delivery options and returns terms are shown on each product page. A 30-day return policy applies to eligible items.

Frequently Asked Questions

Can I keep using a mirror with cracked glass?

Replace it as soon as you can. On vehicles that take the MOT, an obligatory mirror that is slightly damaged counts as a defect, and one not providing an adequate view to the rear is a major defect.

Will a non-heated mirror work in place of a heated one?

It fits if size, class and arm fitment match, but you lose the heating, which helps clear fog, frost and condensation. To keep it, order a heated head in your machine’s voltage, such as the 24V M926CEH heated twin-lens mirror.

Flat or convex: which shows more?

Convex. A curved lens shows a wider area than a flat mirror of the same size, but makes things look smaller and further away. Wide-angle heads such as the M455CEB use a tight 300mm radius; main mirrors use 1,200mm or 1,800mm.

Are unbreakable mirrors worth it on farm machinery?

If glass keeps breaking, yes, and switching is easy. Several heads come in both forms: the M555CE and the unbreakable MX555CE are both 185mm x 276mm, Class II and III, for 10–20mm arms, so the arm stays the same.

Can I find a mirror from my machine’s part number?

For some heads, yes. The M926CE, for example, cross-references JCB 334/G2944 and Thwaites 105834P. Type the number from your old mirror or parts book into our site search, or send it to our team.

Mirror or reversing camera: which is better?

You don’t have to choose. Fit the right mirrors first; where the driver still can’t see clearly behind or around the machine, add extra mirrors or a camera. A wide-angle head such as the MX250CE helps reduce blind spots beside the cab.

How do I fit a mirror where there are no mounting holes?

If there’s a tube or post to clamp to, no drilling is needed: the MX941B safety mirror comes with a clamp for 16–28mm arms or poles. Otherwise, send our team a photo of the spot and we’ll suggest a fixing.

Should the mirror go inside or outside the cab?

Outside for the rear and side views, which main and wide-angle heads give; inside for a view of the rear window or load space. Most interior heads fix with M6 slots or an M6 stud; place them where they don’t block the forward view.

Can I fit a heated or powered mirror myself?

Yes, if you are confident with vehicle wiring. Confirm the mounting suits, clamp the head on like any other, connect the wiring securely and check the heater or motor works before the machine goes back to work.

What is a yellow mirror housing for?

It makes the mirror itself easy to spot. A yellow housing stands out during safety checks and walk-around inspections, and can help meet site rules on visibility equipment. Several main and wide-angle heads come in yellow.