JANSEN® HMK-100 Hydraulic Mulching Head – Versatile
The JANSEN® HMK-100 is a compact hydraulic mulching head designed for a wide range of mowing and mulching tasks. Thanks to its universal design, it is suitable for custom mounting on compatible carrier vehicles and carrier frames.
The HMK-100 is intentionally offered without a vehicle-specific mounting bracket. This allows the mulching head to be individually adapted to an existing carrier vehicle. To assist with the design and fabrication of a suitable mounting bracket or adapter frame, we provide a dimensioned hole pattern of the existing mounting points.
In addition, the JANSEN® HMK-100 can also be mounted and used on compatible JANSEN® HMS models, among others.
Quick Overview – Key Benefits
- Hydraulically driven mulching head
- Universal design for custom mounting configurations
- For compatible carrier vehicles and carrier frames
- Also compatible with suitable JANSEN® HMS models
- Hydraulic pump included
- Required hydraulic flow rate: at least approx. 25–30 l/min
- Required oil pressure: at least 150 bar
- Pressure-free return required
- Pressure connections: M18 × 1.5 – 12L
- Connection for leak oil line / pressure-free return: 1/4" BSP
- Rotation direction of the flail shaft reversible
- 20 flexibly mounted Y-blades
- Beater shaft with Ø 80 mm
- Follow-up roller with Ø 102 mm
- Assembled weight: approx. 82 kg
Hydraulic Drive
The JANSEN® HMK-100 is hydraulically driven. The hydraulic pump required for the drive is included with the mulching head.
For reliable operation, a hydraulic flow rate of at least approx. 25–30 l/min and an oil pressure of at least 150 bar are required.
In addition, a pressureless return line is required. Before installation, it must therefore be verified that the intended carrier vehicle or its hydraulic system meets the necessary requirements.
Hydraulic Connections
The following connections are required to integrate the HMK-100 into the hydraulic system:
- Pressure hoses: M18 × 1.5 – 12L
- Leakage oil line / pressureless return: 1/4" BSP
Important: The required hydraulic hoses are not included in the scope of delivery.
The hydraulic hoses must be procured or manufactured by the customer to suit the respective carrier vehicle, the required hose length, and the specific installation situation.
Selectable direction of rotation for the flail shaft
Another advantage of the JANSEN® HMK-100 is the ability to change the direction of rotation of the flail shaft and thus of the Y-blades.
The hydraulic drive can operate in both directions of rotation. Depending on the hydraulic system of the carrier vehicle being used, the direction of rotation can be selected, for example, by swapping the hydraulic lines or using a suitable double-acting hydraulic control or a double-acting pedal.
This allows the HMK-100 to be flexibly adapted to the respective carrier vehicle and the existing hydraulic control system.
Robust flail shaft with 20 Y-blades
At the heart of the HMK-100 is the robust flail shaft with a diameter of 80 mm. The shaft is equipped with a total of 20 Y-blades mounted on movable bearings.
The rotation of the flail shaft captures and shreds the vegetation. This makes the HMK-100 suitable for various mowing and mulching tasks as well as for the regular maintenance of suitable green spaces and properties.
Trailing roller for even guidance
A robust trailing roller with a diameter of 102 mm ensures smooth guidance of the mulching head across the ground.
Combined with the compact design and the flexibly mounted Y-blades, this results in a versatile mulching head for suitable hydraulic carrier systems.
Universal Mounting – Customizable
A particular advantage of the JANSEN® HMK-100 is its flexible adaptability. The mulching head is not limited to a single carrier vehicle but can be adapted by the user to a suitable carrier vehicle or a corresponding carrier frame.
A vehicle-specific mounting bracket is not included in the scope of delivery. Instead, we provide a dimensioned hole pattern with the existing mounting points.

Based on these dimensions, the customer can design and manufacture a suitable mounting bracket or adapter frame.
Before installation, both the mechanical suitability and load-bearing capacity of the host vehicle as well as the available hydraulic power must be verified.
Also suitable for compatible JANSEN® HMS models
In addition to custom installation on suitable carrier vehicles, the JANSEN® HMK-100 can also be mounted and operated on compatible JANSEN® HMS models, among others.
This allows the HMK-100, for example, to be used as a separate or additional mulching head for corresponding machines from the JANSEN® HMS series.
Technical Specifications
- Model: JANSEN® HMK-100
- Drive: hydraulic
- Required hydraulic flow: at least approx. 25–30 l/min
- Required oil pressure: at least 150 bar
- Hydraulic return: pressureless return required
- Pressure hose connections: M18 × 1.5 – 12L
- Leakage oil line connection: 1/4" BSP
- Rotation direction: bidirectional / reversible
- Number of blades: 20 Y-blades
- Flail shaft diameter: 80 mm
- Rear roller diameter: 102 mm
- Assembled weight: approx. 82 kg
- Packaging dimensions: 1300 × 620 × 480 mm (L × W × H)
- Weight with packaging: approx. 102.5 kg
Scope of delivery
- JANSEN® HMK-100 mulching head
- Hydraulic pump
Hydraulic hoses are not included in the scope of delivery.
Due to differences in carrier vehicles, connection points, and required hose lengths, the necessary hydraulic hoses must be procured or custom-made by the user.
Important Note on Installation and Compatibility
The JANSEN® HMK-100 is shipped without a vehicle-specific mounting bracket and without hydraulic hoses.
When used on a custom carrier vehicle, the customer is responsible for designing and manufacturing a suitable mounting bracket as well as for proper installation. A dimensioned hole pattern of the existing mounting points is provided for this purpose.
Please check the following requirements in particular before purchasing:
- Sufficient load-bearing capacity of the carrier vehicle
- Suitable mounting or adaptation options
- Hydraulic flow rate of at least approx. 25–30 l/min
- Oil pressure of at least 150 bar
- Ability for a pressureless return line
- Suitable hydraulic hoses with the required fittings
Due to the wide variety of different carrier vehicles and possible custom mounting configurations, general compatibility cannot be guaranteed outside of the explicitly suitable JANSEN® models.
FAQ – Frequently Asked Questions About the JANSEN® HMK-100
What hydraulic capacity does the HMK-100 require?
Operation requires a minimum hydraulic flow rate of approximately 25–30 l/min at an oil pressure of at least 150 bar.
Is a pressureless return line required?
Yes. A pressureless return line is required for operation.
What hydraulic connections are required?
For the pressure lines, M18 × 1.5 – 12L connections are used. The leak oil line or pressureless return has a 1/4" BSP connection.
Are hydraulic hoses included in the scope of delivery?
No. The customer must procure or fabricate the hydraulic hoses to fit the respective carrier vehicle and the required hose length.
Is the hydraulic pump included in the scope of delivery?
Yes. The hydraulic pump intended for the mulching head is included in the scope of delivery.
Can the direction of rotation of the flail shaft be changed?
Yes. The hydraulic drive can operate in both directions of rotation. The specific method of switching depends on the hydraulic system of the carrier vehicle being used.
Which blades are installed?
The HMK-100 is equipped with a total of 20 freely mounted Y-blades.
Is a vehicle-specific mounting bracket included?
No. The HMK-100 is delivered without a vehicle-specific mounting bracket. To fabricate a custom mounting bracket, we provide a dimensioned hole pattern of the mounting points.
Can the HMK-100 be used on JANSEN® HMS models?
Yes. Among other things, the HMK-100 can be mounted and used on compatible JANSEN® HMS models.
Conclusion
The JANSEN® HMK-100 is a compact hydraulic mulching head with flexible options for customization. With its 80 mm flail shaft, 20 pivot-mounted Y-blades, the 102 mm trailing roller, and reversible rotation direction, it is suitable for various mowing and mulching tasks.
Thanks to the available dimensioned hole pattern, customers can design and manufacture a suitable mounting bracket tailored to their specific carrier vehicle. It can also be used with compatible JANSEN® HMS models.
Internal item#: 1984258657