stump grinder mini excavator

Stump Grinder Attachment for mini excavator MA360

CLASS*Professional Grade

Weight 180 Kg

Stump Grinder Attachment for mini excavator MA470

CLASS*Professional Grade

Weight 192 Kg

1. INTRODUCTION

A stump grinder attachment allows a mini or compact excavator to efficiently remove tree stumps by grinding them into mulch.
The attachment replaces the excavator’s bucket and uses the machine’s hydraulic auxiliary circuit to drive a rotating cutting wheel fitted with tungsten-carbide teeth.

Typical Applications

• Land and site clearance
• Landscaping and vegetation control
• Forestry and urban tree management
• Utility and trenching preparation
• Work in restricted or confined access areas

2. EXCAVATOR COMPATIBILITY

3. TYPES OF STUMP GRINDERS

Stump grinder attachments are categorized by drive mechanism and mobility features. The correct type depends on excavator size, hydraulic capacity, and application.

3.1 Direct-Drive Grinders

• Description: Hydraulic motor drives wheel directly via its shaft.
• Advantages: Compact, minimal maintenance, lightweight.
• Ideal For: 1–3 ton excavators, landscaping use.
• Limitations: Slightly less torque for large hardwood stumps.

3.2 Gear-Drive Grinders

• Description: Motor drives gearbox to increase torque.
• Advantages: High torque, stable cutting under heavy load.
• Ideal For: 3–5 ton excavators and forestry use.
• Limitations: Heavier and requires gearbox oil maintenance.

3.3 Belt-Drive Grinders

• Description: Power transmitted via V-belt or toothed belt.
• Advantages: Smooth operation, protects motor from shock loads.
• Ideal For: Mixed-duty applications, 2–4 ton machines.
• Limitations: Requires periodic belt tensioning.

3.4 Swing-Head Grinders

• Description: Cutting wheel mounted on a frame that swings hydraulically or mechanically side-to-side.
• Advantages: Faster material removal, reduced excavator repositioning.
• Ideal For: 3–5 ton excavators with auxiliary swing circuit.
• Limitations: More hydraulic complexity and weight.

3.5 Fixed-Head Grinders

• Description: The head is rigidly mounted; the operator sweeps with the excavator arm.
• Advantages: Simple, light, and cost-effective.
• Ideal For: Small excavators (1–3 ton).
• Limitations: Slower on large stumps; requires more operator movement.

3.6 Tilt-Head Grinders

• Description: Includes manual or hydraulic tilt mechanism for angled grinding.
• Advantages: Ideal for uneven terrain and sloped work sites.
• Ideal For: 2–5 ton excavators.
• Limitations: Slightly heavier and more expensive than fixed head.

4. MOUNT TYPES

Selecting the correct mount or coupler system ensures compatibility, quick attachment changes, and safe operation.
Mounts vary depending on excavator brand, size, and coupler style.

Mounting Guidelines

• Always match pin diameter, pin spacing, and pin center-to-center distance to excavator specifications.
• Confirm the pin offset to maintain correct grinder geometry and cutting angle.
• Ensure hydraulic hoses are routed safely within the arm’s movement arc.
• Use locking pins or safety clips on manual couplers to prevent accidental release.

5. DESIGN AND COMPONENTS

6. HYDRAULIC INTEGRATION

6.1 Circuit Configuration

[Excavator AUX Pressure Port] → [Grinder IN Port]
[Grinder OUT Port] → [Excavator Return/Tank Port]
[Case Drain Port]* → [Direct Tank Return]

(Only required for high-speed or piston motors.)

6.2 Typical Hydraulic Parameters

⚙️ Adjust excavator’s auxiliary flow control to match grinder rating for optimal torque and cutting performance.

7. INSTALLATION PROCEDURE

1. Preparation
   • Park excavator on level ground.
   • Release hydraulic pressure and clean all couplers.
2. Mounting
   • Attach grinder to coupler or pin frame.
   • Verify secure locking of coupler pins.
3. Hydraulic Connection
   • Connect pressure and return hoses.
   • Ensure rotation direction matches manufacturer’s diagram.
   • Connect case drain (if applicable).
4. Testing
   • Engage AUX circuit at low flow.
   • Check for leaks and smooth rotation.
   • Gradually increase to full speed.

8. OPERATIONAL PARAMETERS

9. SAFETY PRECAUTIONS

10. MAINTENANCE SCHEDULE

11. TROUBLESHOOTING

12. OPTIONAL FEATURES & ACCESSORIES

• Hydraulic tilt or swing frames
• Flow control block (for flow limitation)
• Case drain kits (for piston-type motors)
• Quick coupler adapters (S-series, CW, Klac, pin-on)
• Debris deflector curtains
• Replacement carbide tooth kits
• Hydraulic flow and pressure test kit

13. STORAGE & TRANSPORT

• Clean and grease exposed metal surfaces.
• Store in a dry, covered area.
• Fit dust caps to hydraulic couplers.
• Rest wheel on timber block to protect teeth.
• Secure attachment with proper tie-downs during transport.

14. SUMMARY