Let me start by grounding this in something I’ve seen a hundred times over the last 12 years as a mining tool supplier—because that’s what I am, not some corporate guy in a suit flying in once a year to check gauges. I’ve sat in dust-choked tool sheds outside remote copper mines in Arizona, watched a site foreman kick a malfunctioning cross-cut saw like it owed him money, and spent three days in a Mongolian coal mine troubleshooting a roof bolt drill that refused to pierce rock, even after every part had been replaced. Troubleshooting a mining tool isn’t the same as fixing a wobbly kitchen faucet. This is equipment that has to operate in environments so brutal they’d turn consumer power tools into scrap in a month, and when it breaks, it’s not just the tool that stops—entire production lines grind to a halt. I’ve written this guide not from a textbook, but from the scratch marks on tool parts and the frustration of mine teams who can’t afford downtime. Let’s walk through this step by step, no jargon that doesn’t mean something out here. Mining Tool
First, before you touch anything, stop and document the problem like your next shift depends on it. I know you’re in a hurry—mining sites run on tight deadlines, and if your drill is down, you’re already counting lost tons—but skipping this step is why I see the same wrong part shipped to a site twice a week. Last year, a gold mine in Nevada called us at 2 a.m. saying their rotary blast hole drill was malfunctioning; they said it “wouldn’t turn.” Our field service crew drove four hours out there, and found out the real problem was a clogged air filter that the site shift had written off as “minor grit” instead of what was actually slowing the drill’s motor to a crawl. The difference was this: the first team had said “won’t turn,” while the second (once we walked through the documentation step) noted it “stuttered for 10 seconds after startup, then slowed to half speed, only when operating at 800 RPM, never at idle.” That tiny detail cut our diagnostic time from 12 hours to 45 minutes. So take 10 minutes, no phone calls yet, and note four things: when did it start malfunctioning (was it right after the last maintenance, or after moving the tool to a new bench, or did it just die mid-use?), what exactly is it doing wrong (is it leaking fluid, vibrating excessively, failing to pierce rock, or shutting down completely?), are there any error codes (even old ones that cleared when they rebooted the system—write those down too), and did anything change before it broke (did they use a different lubricant at the last service, or swap out a part from a different brand, or run it longer than the recommended 10-hour stretch without a cool-down)? This isn’t paperwork for the sake of paperwork—it’s the first clue to what’s broken, and it saves everyone, including you, time.
Next, do the “easy checks” that everyone skips, because it’s always the stupid stuff, 9 times out of 10. I’ve lost count of how many times a team has called us saying their roof bolt hammer has no impact, only to find the air line was kinked under a stack of steel rods, or the moisture trap on the compressor was full of water that had backed up into the tool. Mining tools are connected to a system—air, electric, hydraulic—and 70% of malfunctions aren’t the tool itself, they’re the supply line feeding it. For electric tools, check the circuit breaker first, not the tool’s motor. For air tools, check the line pressure: most rotary drills need 90-120 PSI, but if the compressor is set to 70 PSI because of a leak in the main line, the drill will barely operate, and you’ll spend hours tearing apart the gearbox for no reason. For hydraulic tools, check the fluid level and the filter—hydraulic oil gets dirty fast in mines, and a clogged filter will cause pressure drops that feel like a broken pump. Also, check the tool’s ancillary parts: the bit or drill head that’s installed. Last winter, a coal mine in Wyoming had their continuous miner cutting 2 feet per minute instead of 5, and they thought the gearbox was shot. We showed up, and the bit had a single broken carbide insert—something the site crew had missed because they only checked the outer edges of the bit. Bits are consumable, but a broken insert doesn’t just cut slower; it can put extra stress on the gearbox, leading to more expensive damage later. So before you get your wrench out, do these: inspect the power/air/hydraulic supply lines for kinks, leaks, or clogs; test the line pressure at the tool (not just at the compressor) to make sure it’s within the tool’s specification; check the bit, insert, or cutting head for chips, breaks, or improper seating; and clear any debris from the tool’s air intake, exhaust, or control valves—dust and rock dust are the #1 enemy of mining tools, and they build up faster than you think.
If the easy checks don’t fix it, move on to isolating the problem between the tool and its power source. This is the step I teach all our field techs, because it keeps you from guessing. Let’s say you have a hydraulic roof drill that’s not rotating when triggered. First, disconnect the hydraulic hose from the drill, and attach a pressure gauge to the end that connects to the tool. Run the drill at the operating speed you were using before it broke. If the pressure gauge shows the correct PSI (say, 1500 PSI for that drill) and the fluid is flowing smoothly, then the problem is inside the drill itself. If the pressure is too low, or the fluid is sputtering, then the problem is upstream—with the pump, the control valve, or a leak in the main hydraulic lines, not the drill. That’s a huge difference, because you don’t need a tool tech on site if the issue is a pump that needs rebuilt, you need a hydraulics specialist. Another example: for an air-powered jackhammer that’s not hitting hard, disconnect the air hose from the hammer, and attach a test plug with a flow meter. If the air flow and pressure are correct, the hammer’s internal components are bad. If not, the problem is the compressor or the air line. Isolating takes an extra 15 minutes, but it avoids ordering a $300 hammer when all you needed to do is replace a $20 valve in the compressor. I’ve seen mine teams waste thousands of dollars in unnecessary part changes because they skipped this step, thinking the worst first instead of narrowing it down.
Once you’ve confirmed the problem is inside the mining tool, you need to check for wear and tear specific to mining environments—this isn’t like a woodworking tool, where wear is gradual and predictable. Mining tools operate in temperatures that swing from below freezing at night to 100+ degrees Fahrenheit during the day, they’re coated in rock dust and mud, and they’re used to cut through granite, coal, or iron ore, which is way harder than any material a consumer tool encounters. First, check for contamination inside the tool. Most mining tools have a drain plug or a inspection port for air motors or hydraulic chambers. Pop that open, and if you see water, grit, or metal shavings in the fluid or chamber, that’s your issue. Water in a hydraulic system will cause corrosion that eats at valves and gears, and it’s almost always from a faulty moisture trap that no one checked during routine maintenance. Metal shavings? That’s internal wear—either the gears, bearings, or pistons are breaking down, and you’ll need to replace those parts before they cause permanent damage to the tool’s motor or transmission. Then, check for loose or damaged fasteners. Mining tools vibrate constantly, even when they’re not in use, and bolts that are torqued to spec one day will come loose a week later when they’re bouncing against rock. I’ve had customers tell me their drill shut down unexpectedly, only to find that a wiring harness bolt had vibrated loose, cutting power to the motor. It sounds simple, but checking every bolt, pin, and clip on the tool takes less than 10 minutes, and it’s saved more tools than any other part of troubleshooting.
Wait, also—don’t forget to reference the tool’s maintenance history, and don’t assume all tools are the same. Every mining tool we sell has a maintenance schedule printed right on the tool’s frame, because generic schedules don’t work here. A drill used in hard rock has different replacement parts intervals than a drill used in soft coal. Last year, a mine in Utah swapped out a bit for a generic one that wasn’t rated for hard granite, and their drill’s gearbox seized up within 8 hours. They tried to tell us the tool was defective, but when we pulled up their maintenance log (which I make all our customers keep online with our tool management platform), we saw they’d skipped the gearbox oil change that should have been done every 500 operating hours, and they’d used a bit not rated for their application. So if your tool has a brand-specific maintenance guide, pull it up—don’t rely on what worked for a different tool from a different site. And if you don’t have a digital log, take a minute to write down every service date, part change, and operating condition for the tool. When we have a tool that’s been in the field for 10 years, we can tell you exactly when a part should be replaced just from its operating hours, not just the calendar.
Now, a few common mistakes I see every time I’m on site, and how to avoid them. First, don’t over-torque fasteners when you’re repairing a broken tool. When you’re frustrated, it’s easy to crank a bolt tighter than it should be, especially if it’s in a tight space on a drill or hammer. But over-torquing can strip threads, crack the tool’s housing, or bend a shaft, leading to more problems than the original malfunction. Second, don’t use generic parts when you’re replacing components. I know generic bits or seals are cheaper, but mining tools are designed with specific tolerances, and a generic seal that’s 1 millimeter too thin will leak hydraulic fluid in a week. A generic bit that has carbide inserts of the wrong grade will wear out in a tenth of the time, and put extra stress on the tool. Third, don’t run a malfunctioning tool after it starts showing issues. If your drill is vibrating excessively, that’s a sign something’s off—running it will make the wear worse, and you’ll go from fixing a $50 bearing to replacing a $5,000 gearbox. I can’t tell you how many times a site foreman has said “it’ll hold on until the end of the shift” and ended up losing half a day of production because the tool died halfway through a blast.
If you’ve gone through all these steps and still can’t fix the tool, don’t guess—call someone who knows mining tools specifically. Not a general tool repair guy, a mining tool specialist. We’ve got field techs that have worked on everything from small handheld jackhammers to 10-ton blast hole drills, and we’ve seen every malfunction there is. When you call, have that documentation you wrote down earlier ready—we don’t need to ask you 10 questions if you already told us when it broke, what it was doing, and what easy checks you did first. For example, if you call us and say “my 2022 model R-12 drill slowed down at 800 RPM, I checked the air line and it’s 110 PSI, bit is new, no error codes,” we can tell you it’s likely a clogged air motor filter inside the tool, and we can have a part shipped to you in 2 hours, or a tech on site the same day if it’s remote. We also offer a tool health check service—for a small fee, we’ll send a tech out to your site once a quarter, inspect all your tools, do routine maintenance, and flag problems before they become malfunctions. That’s way cheaper than waiting for a drill to break and shutting down a production line.
At the end of the day, troubleshooting a malfunctioning mining tool is less about being a mechanic and more about being systematic. It’s not about guessing which part is broken first, it’s about documenting the problem, checking the simple stuff, isolating the issue between the tool and its power source, checking for mining-specific wear, and if you’re stuck, leaning on people who build and service these tools every day. I’ve been in this business long enough to know that mining is all about grit and speed, but cutting corners on troubleshooting will only lead to more frustration and more downtime. If you’re dealing with a tool that’s giving you trouble, take 10 minutes to document what’s happening, start with the kinked lines and loose bolts, and don’t hesitate to reach out—we’re here to help you keep your operation running. If you want to learn more about our tool maintenance services, or need help troubleshooting a specific mining tool, you can connect with our team to discuss your needs.
Precision Parts References:
- Mine Safety and Health Administration (MSHA). 2021. “Maintenance and Troubleshooting of Portable Mining Tools.” MSHA Technical Report 1-21.
- International Society of Mine Safety Professionals (ISMSP). 2022. “Environment-Specific Maintenance for Hard Rock Mining Equipment.” ISMSP Journal of Mining Safety, Vol. 34, No. 2.
- American National Standards Institute (ANSI)/ASME B107.600-2019. “Safety Requirements for Portable Air-Operated Mining Tools.” American Society of Mechanical Engineers, New York.
- Global Mining Technology Initiative (GMTI). 2020. “Reducing Downtime Through Proactive Tool Management.” GMTI Field Guide for Mine Operations.
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