# Spectra Precision DM-20 Bulldozer Bolt-On Mount
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Overview
The Spectra Precision DM-20 is a field-proven bolt-on rigid mast system engineered specifically for bulldozer blade control applications. At 42 inches tall, it positions LR series laser receivers at optimal elevation for continuous grade reference during excavation and grading operations. This heavy-duty mount features a reinforced steel construction that withstands the constant vibration and impacts inherent to dozer work, while its bolt-on design ensures secure attachment to blade C-frames without welding or permanent modifications. The DM-20 delivers repeatable accuracy for site development, rough grading, and mass excavation projects where maintaining precise elevations is critical to productivity and material management.
Key Specifications
- Mount Height: 42 inches (1067 mm)
- Construction: Heavy-gauge steel with corrosion-resistant coating
- Mounting Method: Bolt-on attachment to blade C-frame
- Receiver Compatibility: Spectra Precision LR series laser receivers
- Weight: 18 lbs (8.2 kg)
- Mast Type: Rigid (non-telescoping)
- Attachment Hardware: Included Grade 8 bolts and lock washers
- Operating Temperature: -20°F to 140°F (-29°C to 60°C)
- Warranty: 3-year manufacturer warranty
What's in the Kit
- DM-20 42-inch rigid mast assembly
- Bolt-on mounting bracket for blade C-frame
- Grade 8 mounting bolts and lock washers
- Laser receiver mounting clamp
- Protective mast cap
- Installation instructions and torque specifications
Job Applications
- Site Development & Mass Grading: Maintains precise grade control during bulk earthwork, reducing over-excavation and material waste while establishing accurate subgrade elevations across large development sites.
- Road Construction & Highway Work: Ensures consistent subbase elevations for roadway projects, delivering the tight tolerances required for proper drainage and pavement longevity while maximizing material efficiency.
- Building Pad Preparation: Achieves level building pads to specification, eliminating costly rework and ensuring proper foundation elevations before concrete or steel construction begins.
- Parking Lot & Paving Projects: Establishes accurate subgrade for asphalt or concrete paving, creating proper drainage slopes and reducing the need for additional base material due to elevation errors.
- Detention Pond & Drainage Features: Cuts precise slopes and depths for stormwater management systems, ensuring proper drainage function and regulatory compliance with engineered specifications.
- Agricultural Land Leveling: Creates uniform field elevations for improved irrigation efficiency and crop yield, paying for itself through reduced water usage and better drainage management on farm operations.
Compatible Accessories
- Spectra Precision LR30 Laser Receiver — Standard single-grade receiver
- Spectra Precision LR50 Laser Receiver — Dual-grade receiver with remote display
- Spectra Precision HV302 Rotary Laser — Self-leveling rotating laser
- Spectra Precision RC502 Remote Control — Wireless laser control
- Universal Receiver Mounting Clamps — Replacement clamps
Related Guides
- Complete Guide to Bulldozer Grade Control Setup
- Choosing the Right Laser Receiver Mount for Your Equipment
- Laser Grading Best Practices for Earthwork Contractors
- Maintaining Your Machine Control Equipment in Harsh Conditions
Frequently Asked Questions
- Will the DM-20 fit my bulldozer model?
- The DM-20 is designed to bolt onto standard blade C-frames found on most mid-size to large dozers (D4-D8 class and equivalents). The universal mounting bracket accommodates C-frame widths from 3-6 inches. Always verify your specific blade configuration before ordering, as some older or specialized blade designs may require custom adaptation.
- Can I use this mount with other brands of laser receivers?
- While the DM-20 is engineered specifically for Spectra Precision LR series receivers, the included mounting clamp uses a standard design that accommodates most laser receivers with 1.5-2 inch body diameters. However, control box routing and cable management are optimized for Spectra equipment, so some adaptation may be needed for other brands.
- How does the rigid mast compare to telescoping mast systems?
- Rigid masts like the DM-20 offer superior durability and repeatability in demanding dozer applications. Unlike telescoping masts, there are no moving parts to wear, bind, or require adjustment. The fixed 42-inch height is optimal for most grading work, keeping the receiver above the blade cutting edge while maintaining visibility. Telescoping masts are better suited for applications requiring frequent height changes.
- What maintenance does the DM-20 require?
- Inspect mounting bolts weekly and retorque to 65 ft-lbs as needed, especially during the first month of use as connections settle. Check for cracks or damage to the mast and mounting bracket after significant impacts. Clean accumulated dirt and debris from bolt holes and mounting surfaces. Apply anti-seize compound to bolts during reinstallation. The powder-coated finish typically requires no maintenance, but touch up any chips or scratches to prevent rust in corrosive environments.
