Pick-up
Coordinate free equipment or component pick-up when applicable.
24-Hour Rush Repair
Find the failure first · Fontana, CA
Heavy Equipment Diagnostics
Heavy Equipment Diagnostics is core work at Top Notch Equipment Repair in Fontana. Expect a documented teardown, honest measurements, in-house machining and a tested result — with free quotes and a rush line that answers 24 hours a day, 365 days a year.
Find the failure first · Fontana, CA
What a real diagnostic visit looks like
Equipment comes in dead and leaves working: the failure is documented, the repair is quoted from real measurements, and the machining, welding, grinding and rebuilding all happen in-house. Free pick-up and delivery keep the logistics off your crew, and rush work runs around the clock, every day of the year.
You get the findings the way we found them: photos, video, and a plain-language explanation of what failed, why it likely failed, and what the repair options are — from targeted repair to full rebuild — each with its own written quote.
Heavy Equipment Diagnostics · Fontana, CASymptoms we chase down every week
Hydraulic drift and weak lift, overheating, grinding or whining from gearboxes and final drives, power loss under load, hard starting and no-start diesels, transmission slip, metal in the oil, and the mysterious intermittent fault that only appears under load. Intermittents are where documented, methodical diagnosis pays for itself.
Diagnostics are part of our standard process — inspection and the quote are free. Regular hours Monday–Friday 6 AM–5 PM; rush line 24 hours, every day of the year.
- Engine and drivetrain fault isolation
- Hydraulic pressure and contamination checks
- Gearbox and final-drive failure analysis
- Electrical-starting and charging faults
- Pre-purchase and pre-sale machine evaluation
Our 8-step repair process
A clear path from the first call to a tested component or machine returned to work.
Inspection
Disassemble and evaluate the complete failure.
Photos & video
Document condition and findings for a clear repair conversation.
Repair quote
Define the recommended work and quote before proceeding.
Approval
Confirm scope, urgency and the practical path forward.
Manufacturing
Machine, weld, rebuild or reverse engineer required components.
Testing
Verify operation and workmanship before release.
Shipment
Return the completed component or equipment to service.
Frequently asked questions
Does diagnosis cost anything?
Inspection and the repair quote are free. You approve the scope before any billable repair work proceeds.
What do I get from the inspection?
Photos and video of the failure, a plain explanation of what we found, and written options with quotes.
Can you diagnose a machine that only fails sometimes?
Yes — bring us the pattern: when it happens, under what load, hot or cold. Intermittent faults are a diagnosis specialty, not a nuisance.
Related services
Emergency breakdown? Call the 24-hour rush line.
(949) 400-2937Schedule service or open a repair order
Request a service call.
Tell us the make, model, symptoms, where the machine sits and how urgent it is. Your details open as a text to the shop, ready for you to review before you send.