DymaxRail Ballast Blaster undercutter attachment with pin grab coupler on hi-railed excavator

Ballast Blaster Undercutter for Pin Grab Couplers

OVERVIEWCOMPATIBILITYMID TO LARGE EXCAVATOR MODELSBACKHOE & SMALL EXCAVATOR ENHANCED PERFORMANCEVIDEO
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The DymaxRail Ballast Blaster Undercutter for pin grab quick couplers is an undercutter attachment that features advanced patented design and durability.  A DymaxRail Ballast Blaster Undercutter efficiently removes fouled ballast rock and mud by cutting and pulling the material out from beneath the railway tracks.  This attachment adapts to Railway Excavators and Backhoe Loaders equipped with a traditional pin-grab type coupler system and feature built-in rotation and tilt for positioning.

Rail networks prefer using DymaxRail Ballast Blasters over conventional on-track ballast cleaners, as they are more efficient and easier to get on and off track, especially congested networks with severe time restraints.

Our patented Ballast Blaster Undercutter features bolt on indexable wear plates with full carbide protection that surrounds all sides of the cutter bar and includes a 2 year warranty.

A DymaxRail Ballast Blaster cuts and removes ballast faster with it’s innovative chain design.  The Dymax Carbide Tooth (DCT) features two-sided protection allowing operators to cut in both directions.

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Got Mud ProblemsGet a Ballast Blaster

When an on-track machine isn’t the answer

Full ballast cleaning machines have their place — but they require dedicated track time, significant lead time to mobilize, and are sized for production runs, not spot work. Rail networks increasingly use excavator-mounted undercutters for mud spots, targeted fouling, areas around switches and crossings, and any situation where getting a large machine on track isn’t practical. The Ballast Blaster works from a hi-railed excavator or backhoe already on your crew — so you’re not scheduling around a machine, you’re solving the problem in the same window you’re already in.

Compatible with the backhoes & excavators your crew runs

The Ballast Blaster fits excavators and backhoe loaders from leading manufacturers, including Caterpillar (308–336 series), John Deere (85–350 series), and Komatsu (PC78–PC138). See the full model table for machine weight class, bar length options, and hydraulic requirements for your specific unit.

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DymaxRail Ballast Blaster 180 and 360 rotation undercutter models for 13-30 ton excavators with automatic chain tensioning and carbide wear plates
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All mid-large excavator models feature automatic chain tensioning and replaceable carbide wear plates. The most durable solution.

B180 – Ballast Blaster

  • 20-25 ton excavators
  • 180-degree rotation through innovative hydraulic cylinders
  • 10ft, 12ft and 15ft bar cutting length
  • 30-degree bar tilt
  • Powerful drive motor
  • Replaceable carbide wear plates
  • Automatic chain tensioner
  • Optional spoilmaster wheel

B360RB – Ballast Blaster

  • 13-18T Excavators
  • 360 degree rotation box for compact slim design
  • Available only in 10ft cut length models for 13-18t excavators
  • 10ft bar cutting length
  • 30 degree bar tilt
  • Powerful drive motor
  • Replaceable carbide wear plates
  • Automatic chain tensioner
  • Optional spoilmaster wheel

B360-Twin Drive Ballast Blaster

  • 25-30 ton excavators
  • 360 degree rotation twin drive with built in brake
  • 12ft and 15ft bar cutting length
  • 30 degree bar tilt
  • Powerful drive motor
  • Replaceable carbide wear plates
  • Automatic chain tensioner
  • Optional spoilmaster wheel

B360-SMALL BALLAST BLASTER

  • Suited for Backhoe and 8-11 ton excavators
  • 360 degree rotation (compact)
  • 6ft and 8ft bar cutting length option
  • 30 degree bar tilt
  • Powerful drive motor
  • Replaceable carbide wear plates
  • Manual chain tensioner
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DymaxRail Ballast Blaster B360 small undercutter model for backhoe loaders and 8–11 ton excavators showing bolt-on carbide wear plates
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Replaceable bolt on carbide wear plates

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Quickly attach to backhoe loaders and small 8 to 11 ton excavators

  • For 13-36T models including 10, 12 and 15 foot cutter bar lengths.
  • Provides shock absorbing performance to increase chain life and reduce chain breaks.
  • Includes tensioner gauge for visual recognition of chain tension pressure.
  • Full shroud protection around drive sprocket.
  • Reduces seal contamination by keeping unwanted debris out.
  • AR400 Wear plates provide additional wear protection.

When its time to service it’s quick and easy with removable top adapter.

  • Automatic chain tensioner gauge on DymaxRail Ballast Blaster undercutter showing chain tension pressure indicator
  • AR400 wear plate armor guard protecting drive sprocket on DymaxRail Ballast Blaster undercutter
  • Bolt-on indexable carbide wear plates on DymaxRail Ballast Blaster cutter bar
  • Access – Ballast Blaster ServiceRemovable top adapter on DymaxRail Ballast Blaster undercutter providing quick access to drive motor for servicing
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SPECIFICATIONS

Model
Description
Weight
DX-UC-B360-6ftxADCT-BL-10

Undercutter-Ballast Blaster 360 degree rotation-6 feet cutting length x Size “A” chain with DymaxRail Carbide Teeth-Backhoe Loader-Class 10

45mm/50mm pin connection size

STANDARD FEATURES:

– Cut length: 6 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Mechanical adjuster
– Chain type: Style “A” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 4.1 inches
– Motor: High torque motor, size 25 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 1850 lbs
DX-UC-B360-6ftxADCT-HX-8T

Undercutter-Ballast Blaster 360 degree rotation-6 feet cutting length x Size “A” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-8 ton
45mm/50mm pin connection size

STANDARD FEATURES:

– Cut Length: 6 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Mechanical adjuster
– Chain Type: Style “A” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 4.1 inches
– Motor: High torque motor, size 25 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 1850 lbs
DX-UC-B360-8ftxADCT-BL-20

Undercutter-Ballast Blaster 360 degree rotation-8 feet cutting length x Size “A” chain with DymaxRail Carbide Teeth-Backhoe Loader-Class 20

50mm pin connection size

STANDARD FEATURES:
– Cut Length: 8 feet
– Chain Cut Width: 4.1 inches
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Mechanical adjuster
– Chain Type: Style “A” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Motor: High torque motor, size 25 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 2200 lbs
DX-UC-B360-8ftxADCT-HX-8T

Undercutter-Ballast Blaster 360 degree rotation-8 feet cutting length x Size “A” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-8 ton

50mm pin connection size

STANDARD FEATURES:

– Cut Length: 8 feet
– Chain Cut Width: 4.1 inches
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Mechanical adjuster
– Chain Type: Style “A” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Motor: High torque motor, size 25 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 2200 lbs
DX-UC-B360-8ftxADCT-HX-11T

Undercutter-Ballast Blaster 360 degree rotation-8 feet cutting length x Size “A” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-11 ton

50mm pin connection size

STANDARD FEATURES:
– Cut Length: 8 feet
– Chain Cut Width: 4.1 inches
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Mechanical adjuster
– Chain Type: Style “A” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Motor: High torque motor, size 25 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 2280 lbs
DX-UC-B360-9ftxBDCT-HX-12T

Undercutter-Ballast Blaster 360 degree rotation-9 feet cutting length x Size “B” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-12 ton

60/65mm pin connection size

STANDARD FEATURES:
– Cut Length: 9 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “B” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 30 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5000 lbs
DX-UC-B360-10ftxBDCT-HX-14T

Undercutter-Ballast Blaster 360 degree rotation-10 feet cutting length x Size “B” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-14 ton

60/65mm pin connection size

STANDARD FEATURES:
– Cut Length: 10 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “B” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 30 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5300 lbs
DX-UC-B360-10ftxCDCT-HX-14T

Undercutter-Ballast Blaster 360 degree rotation-10 feet cutting length x Size “C” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-14 ton

60/65mm pin connection size

STANDARD FEATURES:
– Cut Length: 10 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 30 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5300 lbs
DX-UC-B360-12ftxBRCB-HX-25T

Undercutter-Ballast Blaster 360 degree rotation-12 feet cutting length x Size “B” chain with Rotate Carbide Bits-Hydraulic Excavator-25 ton

90-100mm pin connection sizes

STANDARD FEATURES:
– Cut Length: 12 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “B” Series bidirectional cutting chain with Rotating carbide bits
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 35 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system with integrated brake
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 6700 lbs
DX-UC-B360-12ftxBDCT-HX-30T

Undercutter-Ballast Blaster 360 degree rotation-12 feet cutting length x Size “B” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-30 ton

90-100mm pin connection sizes

STANDARD FEATURES:
– Cut Length: 12 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “B” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 35 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system with integrated brake
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 6800 lbs
DX-UC-B360-12ftxCDCT-HX-30T

Undercutter-Ballast Blaster 360 degree rotation-12 feet cutting length x Size “C” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-30 ton

90-100mm pin connections

STANDARD FEATURES:
– Cut Length: 12 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 35 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system with integrated brake
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 6800 lbs
DX-UC-B360-15ftxCDCT-HX-30T

Undercutter-Ballast Blaster 360 degree rotation-15 feet cutting length x Size “C” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-30 ton

90-100mm pin connection size

STANDARD FEATURES:
– Cut Length: 15 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 42 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system with integrated brake
– SpoilMaster Ready: Yes
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 7400 lbs
DX-UC-B360-15ftxCRCB-HX-30T

Undercutter-Ballast Blaster 360 degree rotation-15 feet cutting length x Size “C” chain with Rotate Carbide Bits-Hydraulic Excavator-30 ton

90-100mm pin connection size

STANDARD FEATURES:
– Cut Length: 15 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with rotating carbide bits
– Chain Cut Width: 6.0 inches
– Motor: High torque motor, size 42 with heavy duty bearing group
– Rotation: 360 degree continuous rotation system with integrated brake
– SpoilMaster Ready: Yes
– Bar tilt: Hydraulic bar tilt, cylinder driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 7400 lbs

Design and specifications are subject to change without notice.

Model
Description
Weight
DX-UC-B180-10ftxBDCT-HX-20T

Undercutter-Ballast Blaster 180 degree rotation-10 feet cutting length x Size “B” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-20 ton

80mm pin connection size

STANDARD FEATURES:
– Cut Length: 10 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “B” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High-torque motor, size 30 with heavy-duty bearing group
– Rotation: 180-degree rotation system – hydraulic cylinder arrangement
– Bartilt: Hydraulic Bar Tilt Cylinder Driven provided with electro-hydraulic diverter valve and wiring kit

WEIGHT: 5500 lbs
DX-UC-B180-10ftxBRCB-HX-20T

Undercutter-Ballast Blaster 180 degree rotation-10 feet cutting length x Size “B” chain with Rotate Carbide Bits-Hydraulic Excavator-20 ton

80mm pin connection size

STANDARD FEATURES:
– Cut length: 10 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “B” Series bidirectional cutting chain with DymaxRail forged cutting teeth with rotating carbide bits
– Chain Cut Width: 6.0 inches
– Motor: High-torque motor, size 30 with heavy-duty bearing group
– Rotation: 180-degree rotation system – Hydraulic Cylinder Arrangement
– Bar Tilt: Hydraulic bar tilt, cylinder-driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5500 lbs
DX-UC-B180-10ftxCDCT-HX-20T

Undercutter-Ballast Blaster 180 degree rotation-10 feet cutting length x Size “C” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-20 ton

80mm pin connection size

STANDARD FEATURES:
– Cut Length: 10 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Chain Cut Width: 6.0 inches
– Motor: High-torque motor, size 30 with heavy-duty bearing group
– Rotation: 180-degree rotation system – Hydraulic Cylinder Arrangement
– Bar Tilt: Hydraulic bar tilt, cylinder-driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5500 lbs
DX-UC-B180-10ftxCRCB-HX-20T

Undercutter-Ballast Blaster 180 degree rotation-10 feet cutting length x Size “C” chain with Rotate Carbide Bits-Hydraulic Excavator-20 ton

80mm pin connection size

STANDARD FEATURES:
– Cut Length: 10 feet
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Automatic chain tension US Patent 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with rotating carbide bits
– Chain Cut Width: 6.0 inches
– Motor: High-torque motor, size 30 with heavy-duty bearing group
– Rotation: 180-degree rotation system – Hydraulic Cylinder Arrangement
– Bar Tilt: Hydraulic bar tilt, cylinder-driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5500 lbs
DX-UC-B180-12ftxCDCT-HX-20T

Undercutter-Ballast Blaster 180 degree rotation-12 feet cutting length x Size “C” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-20 ton

80mm pin connection size

STANDARD FEATURES:
– Cut Length: 12 feet
– Chain Cut Width: 6.0 inches
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Auto chain tensioner US Patent # 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Motor: High-torque motor size 35 with a heavy-duty bearing group
– Motor Box: Quick-change motor box top assembly
– Spoilmaster Ready: Yes
– Rotation: 180-degree continuous rotation system; Cylinder powered
– Bar Tilt: Hydraulic bar tilt, cylinder-driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5850 lbs
DX-UC-B180-12ftxCRCB-HX-20T

Undercutter-Ballast Blaster 180 degree rotation-12 feet cutting length x Size “C” chain with Rotate Carbide Bits-Hydraulic Excavator-20 ton

80mm pin connection size

STANDARD FEATURES:
– Cut Length: 12 feet
– Chain Cut Width: 6.0 inches
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Auto chain tensioner US Patent # 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Motor: High-torque motor size 35 with a heavy-duty bearing group
– Motor Box: Quick-change motor box top assembly
– Spoilmaster Ready: Yes
– Rotation: 180-degree continuous rotation system; cylinder powered
– Bar Tilt: Hydraulic bar tilt, cylinder-driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 5850 lbs
DX-UC-B180-12ftxCDCT-HX-25T

Undercutter-Ballast Blaster 180 degree rotation-12 feet cutting length x Size “C” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-25 ton

90-100mm pin connection size

STANDARD FEATURES:
– Cut Length: 12 feet
– Chain Cut Width: 6.0 inches
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Auto chain tensioner US Patent # 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Motor: High-torque motor size 35 with heavy duty bearing group
– Motor Box: Quick-change motor box top assembly
– Spoilmaster Ready: Yes
– Rotation: 180-degree continuous rotation system; Cylinder powered
– Bar Tilt: Hydraulic bar tilt, cylinder-driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 6000 lbs
DX-UC-B180-15ftxCDCT-HX-30T

Undercutter-Ballast Blaster 180 degree rotation-15 feet cutting length x Size “C” chain with DymaxRail Carbide Teeth-Hydraulic Excavator-30 ton

90-100mm pin connection size

STANDARD FEATURES:
– Cut Length: 15 feet / 4.57M
– Chain Cut Width: 6.0 inches
– Bar: Patented bar with replaceable carbide wear plates, US Patent # 8904676
– Tensioner: Auto chain tensioner US Patent # 9487921
– Chain Type: Style “C” Series bidirectional cutting chain with DymaxRail forged cutting teeth with carbide tips
– Motor: High-torque motor size 42 with heavy-duty bearing group
– Motor Box: Quick-change motor box top assembly
– Spoilmaster Ready: Yes
– Rotation: 180-degree continuous rotation system; Cylinder powered
– Bar Tilt: Hydraulic bar tilt, cylinder-driven, provided with electro-hydraulic diverter valve and wiring kit.

WEIGHT: 6600 lbs

Design and specifications are subject to change without notice.

  • All models feature standard DymaxRail two-way carbide forged cutting teeth (DCT Model designations)
  • For customers who prefer rotating carbide bits we offer Kennemetal cutting solutions.
    • Rotating carbide bit models are designated as (RCB) in the models listing.
  • Chain sizes are matched to horsepower requirements.
  • For custom OEM Solutions, contact DymaxRail.
MODELS: DX-UC-B360-6ftxADCT-HX-8T, DX-UC-B360-6ftxADCT-BL-10

HYDRAULIC REQUIREMENTS: Setup and operation are critical for proper operation. Your machine needs to be set up with TWO hydraulic circuits capable of meeting the requirements below. If you have questions, please contact DymaxRail sales for more information.

CIRCUIT 1 – Chain Drive Motor
– Type: Two way + drain line to tank
– Min drain size -08 (1/2in)
– Flow and Pressure GPM/PSI (min/max): 20-26 / 4,500

CIRCUIT 2 – Rotator
– Type: Two-way Med Pressure
– Flow and Pressure GPM/PSI (max): 8 / 3,000

CIRCUIT 3 – Bar Tilt
– Type: Electro-Hyd Diverter Valve
– Set up on the Undercutter. Requires installation of the electric cable service kit provided with switch and fuse.
– Diverts oil from CIRCUIT 2 rotator system.

NOT SUPPLIED: Not provided with Jumper Lines to the machine or disconnects.
MODELS: DX-UC-B360-8ftxADCT-HX-8T, DX-UC-B360-8ftxADCT-HX-11T, DX-UC-B360-8ftxADCT-BL-20

HYDRAULIC REQUIREMENTS: Setup and operation are critical for proper operation. Your machine needs to be set up with TWO hydraulic circuits capable of meeting the requirements below. If you have questions, please contact DymaxRail sales for more information.

CIRCUIT 1 – Chain Drive Motor
Type: Two-way + drain line to tank
Min drain size -08 (1/2in)
Flow and Pressure: GPM/PSI (min/max): 30 / 4,500

CIRCUIT 2 – Rotator
Type: Two-way Med Pressure
Flow and Pressure GPM/PSI (max): 8 / 3,000

CIRCUIT 3 – Bar Tilt
Type: Electro-Hyd Diverter Valve
Set up on the Undercutter. Requires installation of the electric cable service kit provided with the switch and fuse.
Diverts oil from CIRCUIT 2 Rotator system.

NOT SUPPLIED: Not provided with Jumper Lines to the machine or disconnects.
MODELS: DX-UC-B360-9ftxBDCT-HX-12T, DX-UC-B360-10ftxCDCT-HX-14T, DX-UC-B360-10ftxBDCT-HX-14T, DX-UC-B180-10ftxBDCT-HX-20T, DX-UC-B180-10ftxBRCB-HX-20T, DX-UC-B180-10ftxCDCT-HX-20T, DX-UC-B180-10ftxCRCB-HX-20T

HYDRAULIC REQUIREMENTS: Setup and operation are critical for proper operation. Your machine needs to be set up with TWO hydraulic circuits capable of meeting the requirements below. If you have questions, please contact DymaxRail sales for more information.

CIRCUIT 1 – Chain Drive Motor
Type: Two-way + drain line to tank
Min drain size -08 (1/2in)
Flow and Pressure GPM/PSI (min/max): 36-42/ 4,500

CIRCUIT 2 – Rotator
Type: Two-way
Flow and Pressure: GPM/PSI (max): 8 / 3,000

CIRCUIT 3 – Bar Tilt
Type: Electro-Hyd Diverter Valve
Set up on the Undercutter. Requires installation of the electric cable service kit provided with switch and fuse.
Diverts oil from CIRCUIT 2 Rotator system.

NOT SUPPLIED: Not provided with Jumper Lines to the machine or disconnects.
MODELS: DX-UC-B360-12ftxBRCB-HX-25T

HYDRAULIC REQUIREMENTS: Setup and operation are critical for proper operation. Your machine needs to be set up with TWO hydraulic circuits capable of meeting the requirements below. If you have questions, please contact DymaxRail sales for more information.

CIRCUIT 1 – Chain Drive Motor
Type: Two-way + drain line to tank
Min drain size -08 (1/2in)
Flow and Pressure GPM/PSI (min/max): 40-42/ 4,500

CIRCUIT 2 – Rotator
Type: Two-way Med Pressure
Flow and Pressure GPM/PSI (max): 8-10 / 3,000

CIRCUIT 3 – Bar Tilt
Type – Electro-Hyd Diverter Valve
Set up on the Undercutter. Requires installation of the electric cable service kit provided with the switch and fuse.
Diverts oil from CIRCUIT 2 Rotator system.

NOT SUPPLIED: Not provided with Jumper Lines to the machine or disconnects.
MODELS: DX-UC-B180-12ftxCDCT-HX-20T, DX-UC-B180-12ftxCRCB-HX-20T, DX-UC-B180-12ftxCDCT-HX-25T, DX-UC-B180-15ftxCDCT-HX-30T

HYDRAULIC REQUIREMENTS: Setup and operation are critical for proper operation. Your machine needs to be set up with TWO hydraulic circuits capable of meeting the requirements below. If you have questions, please contact DymaxRail sales for more information.

CIRCUIT 1 – Chain Drive Motor
Type: Two-way + drain line to tank
Min drain size -08 (1/2in)
Flow and Pressure GPM/PSI (min/max): 40-42 / 4,500

CIRCUIT 2 – Rotator
Type: Two-way Med Pressure
Flow and Pressure GPM/PSI (max): 8-10 / 3,000

CIRCUIT 3 – Bar Tilt
Type: Electro-Hyd Diverter Valve
Set up on the Undercutter. Requires installation of the electric cable service kit provided with the switch and fuse.
Diverts oil from CIRCUIT 2 Rotator system.

OPTIONAL CIRCUIT 4 (SPOILMASTER)
Type: One-way + drain line to tank
Min drain size -08 (1/2in)
Flow and Pressure GPM/PSI (min/max) 10-15 / 3,000

NOT SUPPLIED: Not provided with Jumper Lines to the machine or disconnects.
MODELS: DX-UC-B360-15ftxCRCB-HX-30T, DX-UC-B360-15ftxCDCT-HX-30T, DX-UC-B360-12ftxCDCT-HX-30T, DX-UC-B360-12ftxBDCT-HX-30T

HYDRAULIC REQUIREMENTS: Setup and operation are critical for proper operation. Your machine needs to be set up with TWO hydraulic circuits capable of meeting the requirements below. If you have questions, please contact DymaxRail sales for more information.

CIRCUIT 1 – Chain Drive Motor
Type: Two-way + drain line to tank
Min drain size -08 (1/2in)
Flow and Pressure GPM/PSI (min/max): 40-42/ 4,500

CIRCUIT 2 – Rotator
Type: Two-way
Flow and Pressure GPM/PSI (max): 8-10 / 3,000

CIRCUIT 3 – Bar Tilt
Type: Electro-Hyd Diverter Valve
Set up on the Undercutter. Requires installation of the electric cable service kit provided with the switch and fuse.
Diverts oil from CIRCUIT 2 Rotator system.

NOT SUPPLIED: Not provided with Jumper Lines to the machine or disconnects.

Does your machine have a tiltrotator coupler? Learn more about the Ballast Blaster Undercutter for Tiltrotator Couplers. →

FAQ

A ballast undercutter is a hydraulic chain-driven attachment for excavators and backhoes that cuts beneath railway tracks to remove fouled ballast, mud, and contaminated material. It slides under the ties and rail, then pulls the material out from below — restoring drainage and track geometry without removing the rail.

On-track ballast cleaners are high-production machines that require dedicated track time and significant mobilization. An undercutter attachment works from a hi-railed excavator or backhoe your crew already has on site — making it faster to deploy, easier to get on and off track, and better suited for spot maintenance, mud spots, and congested rail networks where windows are short.

Ballast fouls when fine particles — from tie breakdown, subgrade migration, coal dust, or weathering — fill the voids between the stone. Once those voids are blocked, drainage fails, water is retained, and the track bed softens. Left unaddressed, fouled sections develop mud spots, track geometry issues, and accelerated component wear.

The Ballast Blaster is available for machines from 8-ton backhoe loaders up to 30-ton excavators. Bar lengths range from 6 to 15 feet, depending on machine class. See the model table below to match your machine weight to the correct model.

Yes. The Ballast Blaster is available for backhoe loaders, with 6 ft and 8 ft bar options and a 4.1 in (104mm) cut width.

Pin grab models offer 360° continuous rotation (B360 series) or 180° rotation (B180 series) depending on model and machine class. The B360 series uses a compact rotation box on 12–18T excavators and a twin-drive system with built-in brake for 25–36T machines. All models include 30° bar tilt for positioning.

DymaxRail Ballast Blaster undercutter used for track maintenance at Rio Tinto iron ore railway in Karratha, Australia

Rio Tinto Blasts Through Australia’s Rugged Terrain

Rio Tinto is constantly maintaining their rail tracks in Karratha, Australia, due to extreme summer weather and over 40 trains moving to and from the port daily.

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PHOTO GALLERY

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DymaxRail Ballast Blaster undercutter with pin grab coupler removing fouled ballast beneath railway track
Aerial view of DymaxRail Ballast Blaster undercutter bar extended perpendicular to railway track, mounted on hi-railed excavator performing ballast removal
DymaxRail Ballast Blaster undercutter operating on Doosan wheel excavator with hi-rail gear, removing fouled ballast with second hi-rail machine working down the track
DymaxRail Ballast Blaster undercutter on compact excavator cutting between railway ties, showing fouled ballast and mud removed from cribs with ties fully exposed
DymaxRail Ballast Blaster cutter bar cutting horizontally through heavily fouled ballast and mud beneath railway ties, showing active material removal with rotation housing and carbide chain
DymaxRail Ballast Blaster undercutter mounted on large John Deere excavator with cutter bar at full horizontal extension, working next to excavated spoil pile at rail yard
DymaxRail Ballast Blaster 6-foot undercutter attachment mounted on Komatsu PC78 excavator for railway ballast removal
DymaxRail Ballast Blaster undercutter mounted on JCB Hydradig hi-rail excavator performing railway track maintenance
DymaxRail Ballast Blaster 180 and 360 rotation undercutter models for 13-30 ton excavators with automatic chain tensioning and carbide wear plates

Ballast Blaster is a trademark of DymaxRail.

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