Spectra Precision LR50-DM Laser Machine Display Receiver (NiMH) D20 Mast

Overview

The Spectra Precision LR50-DM combines the field-proven LR50 laser receiver with an integrated D20 bolt-on bulldozer mast, delivering a factory-assembled machine control solution for dedicated dozer fleets. This NiMH-powered configuration eliminates on-site fabrication and mounting errors while providing precise grade detection across demanding earthmoving environments. Designed for contractors running multiple dozers on large-scale grading projects, the LR50-DM offers OEM-level reliability with the flexibility of aftermarket installation, reducing both setup time and equipment downtime compared to field-assembled receiver systems.

Key Specifications

• Detection Range: 1,600 ft (500 m) diameter working range
• Accuracy: ±1/16" (1.5 mm) digital readout precision
• Mast Configuration: D20 bolt-on bulldozer mast (factory-integrated)
• Power Source: Rechargeable NiMH battery pack
• Battery Runtime: 60+ hours continuous operation per charge
• Display Type: Multi-segment LCD with numeric grade indication
• Laser Compatibility: Red and infrared rotating lasers (all brands)
• Operating Temperature: -20°F to 140°F (-30°C to 60°C)
• Durability Rating: IP67 dustproof and waterproof sealed housing
• Mounting System: Universal dozer blade bracket (no welding required)

What's in the Kit

• Spectra Precision LR50 laser receiver with machine display
• D20 bolt-on bulldozer mast (pre-installed)
• NiMH rechargeable battery pack
• AC battery charger with multi-region plug adapters
• Universal dozer blade mounting bracket
• Hardware kit (bolts, washers, clamps)
• 20 ft (6 m) armored receiver-to-display cable
• Weather-resistant storage case
• Quick-start installation guide
• Calibration certificate and 3-year manufacturer warranty

Job Applications

• Highway and Road Construction: Maintain precise subgrade elevations across multi-mile corridors where consistent grade accuracy prevents costly paving rework and material overruns on AASHTO-specification projects.
• Building Pad Development: Achieve flatness tolerances for commercial foundations and warehouse slabs where the receiver's digital precision eliminates manual checking and reduces finish grading passes by up to 40%.
• Airport Runway Grading: Meet FAA-mandated longitudinal and transverse slope requirements where the extended detection range supports long-distance laser setups without repositioning equipment.
• Land Leveling and Agricultural Grading: Optimize field drainage and irrigation efficiency across large acreage where the NiMH battery's 60-hour runtime supports all-day operation without recharging interruptions.
• Pipeline Trench Excavation: Control continuous slope grades over miles of linear earthwork where the bolt-on mast configuration allows rapid equipment changes between multiple dozers in the fleet.
• Site Mass Grading: Balance cut-and-fill operations on subdivision developments where factory-calibrated receiver accuracy reduces surveying checkpoints and accelerates project completion schedules.

Compatible Accessories

Spectra Precision LL500 Self-Leveling Rotary Laser – Dual-slope laser transmitter with 1,600 ft range matching receiver capabilities

Replacement NiMH Battery Packs – Spare power sources for continuous multi-shift operation

Spectra Precision LR50 Rod-Mounted Receiver – Handheld configuration for spot elevation checks and utility work

Universal Receiver Masts and Extensions – Alternative mounting solutions for excavators and graders

Related Guides

Complete Setup Guide: Installing Laser Receivers on Bulldozers

Understanding Grade Control Accuracy: Digital vs. Analog Receivers

Maximizing Laser Detection Range in Bright Conditions

Preventive Maintenance for Machine-Mounted Laser Equipment

FAQ

Does the D20 mast fit all bulldozer blade types?

The D20 bolt-on mast includes a universal mounting bracket that adapts to standard straight blades, angle blades, and semi-U blades on dozers from Caterpillar, Komatsu, John Deere, and Case models. The bracket clamps to blade top edges without welding or permanent modifications. For specialized blade configurations like coal blades or landfill U-blades exceeding 16 ft width, contact our application specialists for custom mounting solutions.

How does the NiMH battery compare to alkaline options?

The included NiMH rechargeable pack delivers 60+ hours runtime versus 40-50 hours from alkaline D-cells, while eliminating recurring battery purchases that typically cost $400-600 annually per receiver. NiMH batteries maintain voltage stability in cold temperatures down to -20°F where alkalines lose 50% capacity, and the overnight charging cycle integrates seamlessly with daily equipment maintenance routines.

Can this receiver work with non-Spectra lasers?

Yes, the LR50-DM detects rotating laser beams from all manufacturers including Topcon, Leica, Trimble, and Johnson Level models operating on both red (visible) and infrared wavelengths. The receiver's universal compatibility supports mixed equipment fleets and allows contractors to use existing laser transmitters without brand-locked limitations, though best performance occurs with Spectra's matched LL-series lasers.

What's the advantage over field-assembled mast systems?

Factory integration ensures the receiver sensor aligns precisely perpendicular to the mast axis—critical for accuracy when the dozer blade angles during turning operations. Field-assembled systems introduce 3-5mm positioning errors from improper bracket torque, thread misalignment, and vibration loosening. Pre-configured systems eliminate 2-3 hours of installation labor per machine and prevent the 15-20% service call rate associated with incorrect field assembly.