Verified longhole package.
The 1,220/1,525/1,830 mm drilling modules, 20+1 magazine and 38 m maximum depth are confirmed by the 2026 factory comparison data.
ProductLGMRT · Underground Mining
LGMRT UDL391RH Underground Longhole Drill Rig
An underground top-hammer longhole production drill with heavy-duty four-wheel drive, articulated steering and automatic anti-jamming control. Verified factory-sheet data confirms 1,220/1,525/1,830 mm drilling modules, a 20+1 rod magazine and holes up to 38 m, subject to a minimum working drift of 4,000 × 3,900 mm.
Product imagery3 views
The main image is from the public product page. The two underground application images are generated visualizations based on the published machine appearance, not project-site records.
01Hole diameter60–127 mm
02Hole depthUp to 38 m
03Rod magazine20+1
04Operating weight17.65 t
Technical dataView all specificationsProduct parameters
Technical specifications.
Values shown are reference data. Final equipment configuration and regional compliance are confirmed in the technical agreement.
| Parameter | Specification |
|---|---|
| Technical specifications | |
| Brand | LGMRT |
| Model | UDL391RH |
| Drilling method | Top-hammer longhole |
| Hole diameter | 60–127 mm; 64–89 mm typical |
| Maximum hole depth | 32 m standard; up to 38 m with LG-LFRC706 |
| Rock drill | LD120SH 22 kW standard; LD120S 20 kW optional |
| Drilling modules | LG-LFRC704/705/706; 1,220/1,525/1,830 mm rods |
| Rod magazine | 20+1 |
| Minimum working drift | 4,000 × 3,900 mm (H × W) |
| Operating weight | 17,650 kg |
| Transport size | 7,500 × 2,380 × 3,570 mm (L × W × H) |
| Turning width | 3,125 mm |
| Rotation | 0–180 rpm; 1,095 Nm |
| Installed / main motor | 70 kW / 55 kW |
| Water / air | 100 l/min at 10 bar; 1.0 m³/min at 7 bar |
| Travel / gradeability | 8 km/h; 15° gradeability / 5° side tilt |
| Controls | THC, EDS and automatic anti-jamming |
Configuration note: Before quoting, verify the actual drift against the 4,000 × 3,900 mm minimum. Confirm T51 shank-adapter availability and the required 380/660/1000 V electrical package with the factory.
Manufacturer sources: Source 1
Product details
Designed around real drilling conditions.
An underground top-hammer longhole production drill with heavy-duty four-wheel drive, articulated steering and automatic anti-jamming control. Verified factory-sheet data confirms 1,220/1,525/1,830 mm drilling modules, a 20+1 rod magazine and holes up to 38 m, subject to a minimum working drift of 4,000 × 3,900 mm.
Matched drilling performance.
Rotation speed of 0–180 rpm and torque of 1,095 Nm align closely with the DL321 benchmark.
Drift envelope must be checked.
The machine is shorter in transport than DL321 but wider and taller, and requires a minimum 4,000 × 3,900 mm working drift.
Jobsite fit
Configured around your rock, hole plan and climate.
Send us the target diameter, depth, rock hardness, altitude and local emission requirements. We will recommend the drill string, hammer and regional machine configuration before quoting.
Discuss your application →01Underground mining02Longhole production03Fan drilling04Drifts at least 4.0 × 3.9 m
Replacement positioning
Compared with Sandvik DL321 and legacy DL311(-7).
Strong replacement with a drift-size constraint
Confirmed strengths
- Up to 38 m hole depth
- 1,220/1,525/1,830 mm rod options
- 20+1 rod magazine
- 0–180 rpm and 1,095 Nm rotation
- Wider 60–127 mm stated hole range
Constraints to verify
- Minimum drift is 4,000 × 3,900 mm versus DL321 at approximately 3,150 × 3,150 mm
- Transport width 2,380 mm and height 3,570 mm exceed the compared DL321 envelope
- T51 and regional voltage availability require factory confirmation
Customer positioning
Lead with verified drilling parity, but do not describe UDL391RH as more compact than DL321. Confirm the customer's drift dimensions before offering it as a replacement.
Heavy Rig support
From configuration to productive drilling.
Application review
We verify ground conditions, hole plan and production targets.
Factory configuration
Drill tools, options, documents and delivery scope are locked before production.
Parts & service planning
Recommended startup spares and consumables help protect your first operating season.
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Need a rig matched to your rock, depth and site conditions?
Send your target hole diameter, depth, rock type and timeline. Heavy Rig will help narrow the configuration.