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Product Spotlight: MB Crusher BF120.4
Every demolition contractor eventually runs into the same problem: what do you do with all the material left behind? Concrete, asphalt, brick, and rock pile up fast, and hauling it off-site costs time, fuel, and money before it ever gets recycled or reused. The MB Crusher BF120.4 solves that problem at the source, by turning the excavator already on your site into a fully functional crushing plant.
Instead of loading debris onto trucks and shipping it to a quarry or recycling facility, the BF120.4 lets you crush it right where it falls. The result comes out the other side as usable aggregate — ready for backfill, sub-base, road prep, or resale — without ever moving the material twice.
What the BF120.4 Actually Does
The BF120.4 S4 mounts to your excavator just like a standard bucket, but instead of simply scooping material, it processes it. Material is collected by the bucket and fed into two hydraulically driven jaws inside the housing. As the jaws close, they crush the material down to a consistent, usable size — then the crushed output is released through an adjustable discharge opening.
View the bucket in action!
Because the crushing happens inside the bucket itself, there’s no need for a separate stationary crusher, no conveyor setup, and no second machine. One operator, one excavator, and material goes from rubble to usable aggregate in a single pass.
Why This Matters on a Jobsite
- Eliminates haul-off costs. Material that would otherwise need to be trucked to a landfill or recycling facility gets processed and reused on site instead.
- Speeds up project timelines. No waiting on dump trucks, no scheduling around facility hours, no weather delays from off-site hauling.
- Reduces material costs. Crushed aggregate produced on site can be reused for backfill, sub-base, or site prep — cutting down on the need to purchase new material.
- Supports recycling goals. Many municipal and commercial demolition contracts now require or incentivize material recycling — the BF120.4 makes that practical without extra equipment.
Built for Big Jobs: Full Specifications
The BF120.4 is the larger end of MB Crusher’s bucket lineup, designed to pair with excavators in the 30–45-ton class. Here’s the full spec sheet:
| BF120.4 S4 — Technical Specifications | |
|---|---|
| Recommended Excavator Weight | 66,140 – 99,210 lb (30 – 45 ton) |
| Bucket Weight | 10,582 lb (4.8 ton) |
| Load Capacity | ≈ 1.7 cubic yards (1.3 m³) |
| Productivity | 65+ cubic yards per hour |
| Mouth Opening | 47.4″ wide × 21.3″ high (1205 mm × 540 mm) |
| Operating Pressure | 220 – 280 bar (> 3,191 PSI) |
| Oil Flow Rate | 190 – 250 L/min (≈ 50 – 66 gal/min) |
| Back Pressure | < 10 bar |
| Optional Accessories | Dust suppression kit, hour meter, 24V iron separator |
| Warranty | 24 months |
| Hydraulic Compatibility Note |
| The BF120.4 requires both the oil flow rate and operating pressure to be met simultaneously — not just one or the other. Before ordering, we’ll confirm your excavator’s auxiliary hydraulic circuit can deliver both specs together. This is one of the most common mismatch points on crusher bucket installs, and it’s exactly what our team checks before a unit ships. |
Where the BF120.4 Gets Put to Work
MB Crusher built the BF120.4 for large-scale, high-volume applications — this isn’t a unit for small residential jobs. It’s suited for operations where the volume of material processed justifies the bucket’s size and the excavator class required to run it.
Common scenarios where contractors reach for this size of crusher bucket: a demolition site generating large volumes of concrete and masonry debris that needs to be reduced and reused as backfill; a quarry operation looking to process overburden or oversized material into usable aggregate without bringing in a stationary crusher; or a road construction project that needs sub-base material produced on site rather than trucked in.
What Sets the BF120.4 Apart
High Capacity
At 1.7 cubic yards and over 65 cubic yards per hour of throughput, the BF120.4 keeps pace with large-scale demolition and quarry operations rather than becoming the bottleneck.
Wide Mouth Opening
A 47.4″ × 21.3″ mouth opening accepts larger pieces of debris without requiring extensive pre-breaking, saving a processing step before material ever reaches the jaws.
Iron Separator Option
The optional 24V iron separator pulls rebar and metal fragments out of the crushed output automatically — critical for demolition debris that often contains embedded reinforcement.
Dust Suppression Kit
An optional dust suppression system helps keep crushing operations compliant on urban and enclosed jobsites where airborne dust is a regulatory or neighbor concern.
Is the BF120.4 Right for Your Fleet?
The BF120.4 is purpose-built for excavators in the 30–45 ton range running large-volume demolition, quarry, or recycling operations. If your excavator class or jobsite volume doesn’t match that profile, MB Crusher offers smaller bucket crushers in their lineup, like the BF90.3, that may be a better fit — we carry those as well and can help you compare.
Because this is a hydraulically demanding attachment, the most important first step is confirming your excavator’s flow and pressure output can actually support it. That’s where we come in — our team will verify compatibility against your specific machine before you commit to a unit.
Ready to Talk Through the BF120.4 for Your Fleet?
As an MB Crusher dealer, we’ll help you confirm hydraulic compatibility with your excavator, walk through pricing, and get the right unit on your jobsite.