The PM Checklist That Quietly Saves You Thousands

Spun bearings, blown hydraulics and cooked engines almost always trace back to something a routine check would have caught. Here is the schedule, and the part nobody gets right.

Why PM Pays, in Plain Numbers

The big repair bills are almost never the result of a sudden event. They are the end of a sequence that started with something cheap and visible. A seal weeps, the oil level drops, the bearing runs dry, and the housing is scrap. Every stage of that was catchable, and each stage costs roughly an order of magnitude more than the one before.

That is the whole argument. Preventative maintenance is not about being thorough. It is about intervening early in a sequence that gets ten times more expensive at every step.

Daily or Every Operating Period

These belong to the operator and take ten minutes.

• Engine oil level and condition
• Coolant level, plus a look for any staining or crust that signals a slow leak
• Hydraulic oil level, and a walk round looking for wet spots
• Visible hoses, belts and fittings for chafe, cracking or weeping
• Tyre pressure or track condition
• Any new noise, new smell or new vibration, reported rather than tolerated
• On tracked machines, clean packed material out of the running gear before it sets

Weekly

• Grease to schedule, every point, not the easy ones
• Blow out the cooler stack. In dusty work this is the single highest value ten minutes on the machine
• Check track tension against the manual, and re-check as the undercarriage wears
• Walk every weld seam near a cylinder mount and look for rust weeping out of apparently solid metal, which is frequently the first sign of a crack
• Battery terminals and the engine to frame ground strap

On Hour Intervals

• Engine oil and filter at the manufacturer's interval, shortened for severe duty
• Fuel filters and water separator drain. A cheap part that prevents expensive no-starts
• Air filter service, and inspect the whole intake path for leaks while you are there
• Hydraulic filter and fluid service, with attention to how the old oil looks and smells
• Cooling system service, including testing coolant condition rather than just topping it up
• Final drive and swing drive oil, inspecting what drains out and what is on the magnetic plug
• Measured undercarriage inspection as percentages, not an eyeball estimate
• Oil sample on anything with real hours

Severe Duty Means Shorter Intervals

Manual intervals assume reasonable conditions. Most work around here is not reasonable conditions. Dust, heat well past 100 degrees through the summer, abrasive material, and long hours all qualify as severe duty, and the manual will usually say to shorten intervals accordingly.

In practice that means cleaning coolers more often than feels necessary, servicing air filtration more often, and measuring undercarriage wear more often on abrasive ground. We went into that in detail in our guide to undercarriage wear and track maintenance.

Fold Compliance Into the Same Visit

For California fleets, there is no reason for emissions compliance to be a separate event. Attach Clean Truck Check to a scheduled PM visit and it stops being something that sneaks up with a deadline attached. Same for brake and safety items, which we covered in the inspection items that actually park trucks.

The Part Everybody Gets Wrong

PM does not fail because owners disbelieve in it. It fails because nobody owns the schedule. There is no calendar, no record, and no person whose job it is, so it happens when somebody remembers, which is to say after something breaks.

Two fixes, both boring and both effective. Write it down with dates and initials, so you can see what was actually done rather than what was intended. And give the interval work to somebody whose job it is, which usually means a standing arrangement rather than an intention.

We Run This For Fleets On Site

All Mechanical builds fleet maintenance programmes around your hours and your jobs, in your yard, across Tracy, Stockton, Manteca, Modesto, Lathrop, Livermore, Fremont and San Jose. Nothing gets pulled from service to sit in a queue.

See our fleet maintenance service, or call (925) 858-8630.

Frequently Asked Questions

How often should heavy equipment be serviced?

Follow the hour intervals in your machine's manual, then shorten them for severe conditions. Dust, abrasive material, heavy loads and high ambient temperatures all count as severe, which covers most Central Valley and quarry work.

Is oil sampling worth the cost?

On anything with real hours, yes. Wear metals and contamination show up in a sample long before anything is audible or visible, which turns an emergency into a scheduled job. It is one of the cheapest diagnostics available.

What is the most commonly skipped maintenance item?

Cooler and radiator cleaning, followed by track tension on tracked machines. Both are free or nearly free, both are badly neglected, and both cause expensive failures: overheating from one, final drive wear from the other.

Should PM be done in-house or by a mechanic?

Daily and weekly checks belong to whoever operates the machine. The interval services, measured inspections and anything needing instruments are better outsourced, mostly because an in-house schedule without an owner quietly stops happening.

Do you do scheduled maintenance on site?

Yes. Standing fleet maintenance in your yard, on your schedule, is a large part of what we do. Nothing gets pulled from service to sit in a shop queue.