Heavy Equipment Preventative Maintenance: Keeping Your Iron in the Fight

I’ll never forget a fleet manager I worked with in West Valley who thought oil sampling was just a 'scam' by the oil companies. I told him, 'Listen, an oil sample is like a blood test for your machine. It tells me if your engine is "bleeding" metal before the whole thing stops beating!' The report came back with astronomical levels of lead and tin—signs that the main bearings were literally disintegrating. We caught it in time to do a $3,000 bearing roll-in; if we’d waited another week, he would have been looking at a $45,000 engine replacement.

When we show up for preventative maintenance, we aren't just looking at the dipstick. We’re looking for the 'silent killers.' Is there soot loading? Is the viscosity breaking down? In Utah, we have extreme temperature swings that cause condensation in the tanks, which leads to acid buildup in your oil. If you aren't testing, you’re just guessing. And in this business, guessing is a very expensive hobby!

Utah winters are no joke, and they punish the unprepared. A skid steer that will not start in cold weather may have a fuel, battery, starting, electrical, block-heater, or engine-condition issue. Check the machine manual and document the conditions before repeated cranking or improvised starting attempts. Seasonal preparation can reduce cold-weather surprises, but the right maintenance depends on the machine and operating environment.

We recommend a seasonal PM that includes switching to winter-grade fuel, adding anti-gel additives, testing battery CCA and charging systems, checking block heater operation, and inspecting coolant freeze protection. We also do a full inspection of your hydraulic oil—cold, thick oil is the #1 cause of hydraulic pump cavitation in the winter months. Don’t wait for the first snowstorm to think about winter prep. A little foresight keeps your iron running when your competitors are sitting idle.

A useful preventative-maintenance visit is more than an oil change. Start with the machine’s hour meter and service history, then compare fluid levels, filter condition, leak patterns, temperatures, battery performance, belt condition, and undercarriage wear against the machine’s normal baseline. Look for trends: a filter loading faster than usual, one final drive running hotter, a battery losing cranking capacity, or hydraulic oil becoming darker between service intervals. Small changes often appear before a fault becomes a shutdown.

Document each finding with the priority, evidence, and recommended window. Safety-critical issues and active leaks should be handled immediately; wear items can be scheduled around production; routine observations should become part of the next inspection. This turns PM service into a maintenance plan instead of a stack of disconnected invoices.

The ideas in “Heavy Equipment Preventative Maintenance: Keeping Your Iron in the Fight” are most useful when they are compared with the exact machine in front of you. Record the make, model, engine or component identification, operating hours if known, recent repair history, and the conditions that trigger the symptom. Note whether the problem appears cold, hot, unloaded, under working load, or only during a particular function. That record gives a technician a better starting point than a generic description such as “it feels weak” or “it is running hot.”

Use the guide to organize observations, not to condemn a part from one symptom. Several systems can create similar behavior: a control setting, restriction, wiring fault, fluid condition, worn component, or a problem farther upstream may all look alike from the operator seat. Manufacturer specifications, service procedures, and the machine’s actual test results should control the final diagnosis. If a result does not fit the model-specific information, stop and verify the procedure before changing parts.

Before any inspection, make the equipment safe and follow the operator and service manuals. Keep clear of raised attachments, moving tracks, rotating components, hot surfaces, and pressurized hydraulic or fuel systems. Do not bypass a safety circuit, force an emissions procedure, open a pressurized fitting, or work beneath unsupported equipment just to confirm a theory. Photos and written observations from a safe position are more useful than an improvised test that creates a new hazard.

A request for PM Service is easier to scope when it includes the machine location, access conditions, warning codes or dashboard photos, fluid or filter history, and what changed immediately before the failure. Those details help determine whether the next step is an onsite inspection, a controlled field repair, component removal, or shop-level work. The goal is a documented repair path based on the observed failure—not a replacement decision based on a general online checklist.