DD421

DEVELOPMENT DRILL
TECHNICAL SPECIFICATION

Sandvik DD421 is a two boom electro-hydraulic jumbo KEY FEATURES

for fast and accurate drilling in drifting and tunneling of Coverage area 60 m² (9 970 x 6 685 mm)
8 - 60 m² cross sections. Hydraulic rock drills 2 x RD525, 25 kW
Drill feeds 2 x TF512, 12 - 16 ft
The improved hydraulic control system with new Booms 2 x SB60
features enables accurate drilling performance with Control system THC561, hydraulic
efficient control. Hole length Up to 4 660 mm
Drift size class (H x W) 4 500 mm x 4 500 mm
The new Sandvik RD525 rock drill has proven to be an Turning width (T-section) 3 770 mm
efficient drill with smooth penetration and powerful Transport width 2 310 mm
drilling performance. Transport height 3 420 mm / 2 680 mm
Transport length 13 050 mm
Optimal coverage is achieved with the proven Sandvik 24 500 kg
Total weight
SB60 booms. The drilling performance can be improved depending on options
with optional instrumentation.

1. SANDVIK DD421 - DEVELOPMENT DRILL

HYDRAULIC ROCK DRILL ELECTRIC SYSTEM
Type of rock drill RD525 (TS2-236) Standard voltage 380 - 690 V (± 10%)
Percussion power 25 kW Total installed power 180 kW
Percussion pressure Max. 235 bar Main switch gear MSE 20
Percussion rate 93 Hz IP classification Specification TS2-132
Stabilizer Hydraulic Starting method Star delta 380 V - 690 V
Rotation speed Max. 280 rpm (with OMS125) Soft starter 575 V
Rotation torque 625 Nm (with OMS125) TCR4E + spooling (in. 135 kW)
Automatic cable reel
Hole size (drifting) 43 - 64 mm TCR4EHD + spooling (in. 180 kW)
Hole size (cut hole) 76 - 127 mm Operator station and remote control
Cable reel control
T38 - H35 - R32 at rear machine
Recommended rod
T38 - R39 - R35 Auxiliary outlet 1 x 110 V or 1 x 230 V, 16 A
Shank adapter (male) T38 Battery jump start Standard
Weight 225 kg Cable plug holder Hook type holder and cable pull sock
Length 1 010 mm Front and rear lights
10 x 50 W LED (4 200 lm, 6 000 K)
Profile height 90 mm (combined working and driving)

Parking rear brake / park lights 2 x Red LED

DRILLING FEED Stair ans service light LED (24 V)
TF500-12’ TF500-14’ TF500-16’
Type of feed
Standard Optional Optional AIR AND WATER SYSTEM
Feed force Max. 25 kN Max. 25 kN Max. 25 kN Water flushing flow and pressure
Flushing of holes
Total length 5 270 mm 5 880 mm 6 490 mm control. Air-mist flushing , option
Hole length 3 440 mm 4 050 mm 4 660 mm Water booster pump WBP2HP
Rod length 3 700 mm 4 305 mm 4 915 mm Water pump capacity 185 l/min
Net weight 500 kg 530 kg 560 kg Water pump inlet pressure 2 bar (Min.)
Flushing water pressure 10 - 15 bar
BOOM Shank lubrication device SLU2 (air / oil mist)
Type of boom SB60 (TS2-264) Air compressor CTN10, 1.0 m³/min (7 bar)
Parallel coverage 54 m² Compressed air outlet Quick coupling
Parallelism Automatic hydraulic Rock drill oil consumption 180 - 250 g/h
Boom extension 1 200 mm Rock drill air consumption 250 - 350 l/min
Feed extension 1 350 mm
Boom weight, net 2 250 kg OPERATOR’S SAFETY CABIN
Roll-over angle 358° Standard cabin FOPS / ROPS (ISO 3449)
Bolt hole drilling Yes Type of cabin Standard height
Unit height in tramming 3 150 mm
HYDRAULIC SYSTEM Operation Standing drilling, seated tramming
Powerpack 2 x HPP575 (75 kW) For tramming
Operator’s seat
Filtration (pressure / return) 20 µ / 10 µ Adjustable with seat belt
Oil tank volume 270 liters Sound pressure level EN 16228 Cabin: 72 dB(A)
Oil tank filling pump Electric
Fluorinated gas : R134a
Cooler for hydraulic oil OW30 oil-to-water (2 x 30 kW) Filled weight: 1.95 kg
Air conditioning
CO2 equivalent: 2.7885 tons
Global Warming Potential: 1430
DRILLING CONTROL SYSTEM
Type of control system THC561 (TS2-362) Safety laminated, with wiper
Windows
Operating principle Hydraulic control Stainless steel windows frames

Direct control Front screen protection grill Standard

Manual boom control Fully proportional
Hydraulic parallelism

Feed / percussion control

Drilling control
Flushing control
Automatic cycle Stop and return automatics

2. SANDVIK DD421 - DEVELOPMENT DRILL

CARRIER OPTIONAL FEATURES AND PACKAGES
Type of carrier NC7W (frame-steered)
Air and water system
Carrier articulation ± 40° Air mist flushing kit IP5 air cleaner and flow control
Rear axle oscillation ± 8° Flushing flow control 2 booms
Ground clearance 420 mm *End of hole air flushing Including CT28 air compressor
Water hose reel with water hose THR2.5E with 38 mm (1 ½”), 65 m
Diesel engine MB OM904LA, 110 kW, Tier 3, Stage IIIA
Exhaust catalyzer Standard Cleaning system
Transmission Hydrodynamic, Spicer T20000 LP system with reel Up to 15 bar (TS2-343)
Axles Spicer HP system with reel Up to 180 bar (TS2-343)

Tires 14.00-24 PR28

Greasing systems
Service brakes SAHR type, fail safe wet disc brakes Manual system Greasing unit with pump, reel and
Parking and nozzle (5-2110)
SAHR type, fail safe wet disc brakes Automatic system Lincoln (complete)
emergency brakes

16 km/h (Horizontal) Operator’s safety cabin /

Tramming speed
6 km/h (14%=1:7=8°) canopy
Gradeability / sideways tilt Max. 15° / 5° (according to EN 16228-2) *Safety canopy FOPS (ISO 3449)
*Stainless steel cabin FOPS (ISO 3449)
For 10 - 16 ft rods and two shank Cabin heating During tramming and drilling
Rod rack on carrier side
adapters Cabin audio system CD player / radio / MP3 and loud-
Fuel tank 140 liters speakers
Boot washer At cabin entrance
2 x Vertical (front)
Carrier stabilization
2 x Vertical (rear)
Fire suppression system
Centralized greasing points Specification 5-2110 Additional fire extinguisher 1 x 7.7 or 9 kg (type ABC)
Hand held fire extinguisher 1 x 7.7 or 9 kg (type ABC) Manual or automatic system Ansul, 6 nozzles
Automatic system Sandvik Eclipse™
Tramming alarm Standard
Colour scheme Sandvik
Carrier
2 x Operator’s manual Reduced tramming speed 3 rd gear lockout
2 x Maintenance manual *Diesel engine QSB4.5, 119 kW, tier 4i, Stage IIIB
Documentation 2 x Technical manual (in English only) *Foam filled tires 4 pcs
2 x Parts manual (in English only)
Fast filling and evacuation Wiggins (complete)
1 x Toolman CD
system
Wheel chocks and holders 2 Sets
OPTIONAL FEATURES AND PACKAGES Tramming camera Rear and side
Rod rack On carrier side
Rock drill
*Type of rock drill RDX5 instead of RD525 Extra items
HLX5 instead of RD525 Spare rock drill RD525, RD520, RDX5 or HLX5
RD520 instead of RD525 Spare wheel assembly 14.00-24 PR28 or foam filled tire
Special tools for rock drill Complete tool set
Feed Field tool set
*Feed length 14’, 16’ Documentation Extra, CAT base, Link one manuals
*Telescopic feed TFX6/12, TFX8/14, TFX10/16 Package: Country specific LAM, USC, AUS, EUR
Rod retainer TRR1 incl. safety wire, options
add 35 mm length of the feed *Package: Harsh water Basic or advanced (TS2-049)
Two rods system TRS included TRR1 with safety wire. *Package: Arctic To operate in extremely temperature
Package: Anti-freezing Block heater for engine, heater for
Hydraulic system
hydraulic oil, Water circuit flushing
*Powerpack HPP555 (55 kW) with HLX5 or RD520
with air, antifreeze adding in water
*Oil tank filling pump Manual
circuit.
Cooler for hydraulic oil OA30 oil-to-air (2 x 30 kW)
Vaccum pump For hydraulic system *) Replaces standard feature

Drilling control system

Constant speed drilling Replaces feed / percussion control
Instrumentation TMS D2 for TFX-feed
TMS DDSS2 for TF-feed
TCAD+ with iSURE I-II design and
reporting.
Access detector Mandatory in Europe (TS2-211)

Electric system
*Optional voltage 1 000 V (50 or 60 Hz) with Direct-On-
Line starter
*Electric cable Specification TS2-121
Ground fault and overcurrent VYK
protection
Auxiliary outlet 1 x 110 V or 1 x 230 V, 16 A
Battery jump start Option
Dewatering pump outlet Site voltage 380 - 690 V (Max. 8 kW)
Amber flashing light LED (24 V)

3. SANDVIK DD421 - DEVELOPMENT DRILL

 4 340
1500
6 685

2 145

TS2-129:04/ENG/METRIC © Sandvik Mining and Rock Technology 2019 SANDVIK is a registered trademark owned by Sandvik Intellectual Property AB in Sweden and other countries.
2 310 200
9 190
9 970 All dimensions in mm

TF512 TF514 TF516 TFX6/12 TFX8/14 TFX10/16

Total length mm 13 050 13 250 13 700 12 800 12 900 13 500
DD421

3 420
2 680

15˚ 18˚
420
3 080 3 530 1 200
Total length

3 150
DD421

DD421 with cabin option

All dimensions in mm

C
FEED Radius (R) T-cross (C)
R
TF500–12’ 6 800mm 3 920 mm
TF500–14’ 6 950 mm 4 070 mm 3 550
TF500–16’ 7 100 mm 4 250 mm 40°

All dimensions in mm

Sandvik Mining and Rock Technology reserves the right to make changes to the information on this data sheet without prior notification to users.
Please contact a Sandvik representative for clarification on specifications and options.

ROCKTECHNOLOGY.SANDVIK

4. SANDVIK DD421 - DEVELOPMENT DRILL