Denison M7 hydraulic motor 002746-016 for the Sandvik rock drilling rig
Denison M7 hydraulic motor 002746-016 for the Sandvik rock drilling rig
- Product Details
The Denison M7 is a high-torque hydraulic motor built on a robust radial piston design. Part number 002746-016 refers to a specific configuration engineered to match the torque, speed, and mounting requirements of Sandvik’s rock drilling rig platforms, including several models in the DX and DP series used in surface and underground mining, quarrying, and construction drilling.
Why Sandvik Rigs Specify This Motor
Sandvik’s rock drilling rigs — used for blast-hole drilling, face drilling, and bolting applications — subject their hydraulic systems to constant starting, stopping, and stalling against variable rock hardness. A motor that can’t handle that abuse quickly becomes the weak link in the drivetrain.
1. Matching Torque to Rotary Drilling Demand
Rock drilling doesn’t apply steady, predictable loads. The bit encounters seams, fractures, and hard inclusions that spike torque demand unpredictably. The M7’s piston design tolerates these spikes without the internal slippage that plagues gear motors under similar stress, which translates into more consistent rotary speed and better penetration rates.
2. Durability in Contaminated Environments
Drilling sites are dirty. Rock dust, water intrusion, and thermal cycling all shorten component life if the hydraulic motor isn’t built for it. The M7’s hardened internals and tight tolerances are designed to resist the abrasive wear that contaminated hydraulic fluid causes over time, extending service intervals compared to lighter-duty alternatives.
3. Compatibility Across Rig Generations
Because 002746-016 is a defined, cataloged part number, fleet managers running multiple generations of Sandvik rigs can standardize on a single replacement motor rather than juggling several near-equivalent parts. That simplifies inventory and reduces the chance of installing a mismatched unit.
Installation and Maintenance Best Practices
1. Fluid Cleanliness Is Non-Negotiable
Piston motors are more sensitive to particulate contamination than gear or vane designs. A clean fluid target of ISO 18/16/13 or better is a reasonable baseline for M7 installations, and inline filtration should be inspected on a schedule that matches the site’s dust exposure, not just a generic calendar interval.
2. Case Drain Monitoring
The case drain line on the M7 acts as an early warning system. A gradual increase in case drain flow often signals internal wear before performance loss becomes noticeable at the drill head. Tracking this metric over time, rather than reacting only to failures, is one of the simplest ways to extend motor life and avoid unplanned downtime.
3. Torque and Mounting Verification
Because 002746-016 is matched to specific Sandvik mounting patterns, verifying shaft alignment and mounting bolt torque during installation prevents premature bearing wear. A motor that runs slightly misaligned may perform adequately for weeks before failing suddenly under load.
4. Seal and Shaft Inspection at Scheduled Rebuilds
Routine teardown inspection of shaft seals and cam ring surfaces catches wear patterns early. Waiting until external leakage appears usually means the internal damage is already advanced.
Reference Links:
For official documentation: (legacy), sandvik.com (Parts & Services).
What You Get – Beyond the Motor
12-month warranty – covers all manufacturing defects (piston seizure, valve plate wear, seal leaks, bearing failure).
Free replacement parts – within warranty period, we ship new components at no cost (you handle local labor).
Remote video support – our factory engineers guide installation, troubleshooting, and repair via video call, saving expensive service visits.
Extreme durability – proven in Sandvik’s own field tests: 10,000+ hours mean time between failures in fan drive applications.
FAQ – Denison M7 for Fan Cooling
Q1: What does the part number 002746-016 tell me about the motor?
It identifies a specific displacement and configuration within the Denison M7 family, matched to Sandvik’s rotary drive torque and speed requirements. When ordering replacements, this number ensures you get a drop-in match rather than a near-equivalent that may not perform identically.
Q2: How often should the motor be rebuilt?
There’s no universal number — it depends on rock hardness, fluid cleanliness, and duty cycle. Tracking case drain flow and rotary speed consistency is a more reliable guide than a fixed hour interval.
Q3: What are common failure signs to watch for?
Declining rotary speed under load, increased case drain flow, unusual noise during torque spikes, and visible external leakage are the primary warning signs. Catching these early usually means a planned rebuild instead of an unplanned rig shutdown.
Q4: Where can I find official Sandvik service manuals for my rock drilling rig?
Visit sandvik.com → Parts & Services → Equipment manuals.
✅ Final Takeaway
The Denison M7 gold cup motor (118.8 cc/rev, 420 bar, 3600 rpm) is the ideal hydraulic fan drive for Sandvik excavators and other heavy machinery. With a 12-month warranty, free replacement parts, remote video support, and proven resistance to pressure spikes, explosive dust, and extreme temperatures, it keeps your equipment cool when the work gets hot. Download the full technical datasheet at www.baolilai-pump.com.
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