2021 M&J 4000M

Outside of the frame was reinforced with angle iron and painted as factory recall. Has aggressive, 8 hard-faced "samurai knives". Unit in excellent condition. Includes cross-magnet. Was used for wood waste (makes 6" minus).

Reduced price (was $675,000)

2021 M&J 4000M

2021 M&J 4000M — 2,750 hours, which is roughly 690 hours per year. This is a high-production shredder with reinforced structure and upgraded cutting components.

Who This Machine Is For

• Wood waste processors — optimized for consistent 6" minus output
• Recycling facilities — built for steady, high-volume production
• C&D operations — capable of handling mixed material streams
• Buyers looking for upgraded units — reinforced frame and improved cutting system

What It Shreds

• Wood waste — produces consistent 6" minus material
• C&D waste — reduces mixed demolition debris
• Bulky waste — handles large, irregular materials
• General recycling material — adaptable depending on setup

This machine uses slow-speed shredding technology to reduce wear, dust, and noise while maintaining high torque.

Specs in Plain Language

2,750 hours on a 2021 machine — that averages to about 690 hours per year, which reflects steady production use. It is powered by a 540HP CAT C15 engine, delivering strong performance for demanding applications.

The frame has been reinforced with angle iron and repainted as part of a factory recall, which adds durability and long-term structural strength.

This unit is equipped with aggressive, hard-faced “samurai knives,” designed to improve cutting performance and extend wear life. It also includes a cross-magnet, which helps remove metal contamination during processing.

The machine was used for wood waste and is set up to produce approximately 6" minus material, making it ideal for operations focused on consistent output sizing.

If you are comparing options, this unit stands out for its reinforced structure, upgraded knives, and included magnet system. You can also browse similar units on our shredders page or explore equipment that works alongside shredders like trommel screens.

Why Buy From GrinderCrusherScreen

We've been in the shredder business since 1973. We know these machines because we work in this industry every day. We can answer your questions about the 4000M before you buy, and we help with financing, coordinating inspections, and arranging transportation.

Got a shredder you need to sell? We handle the marketing, the calls, the tire kickers, and the transaction. It's free. You set your price, you get your price.

Call 770-433-2670 or email sales@grindercrusherscreen.com for pricing and details.