Pick-up
Coordinate free equipment or component pick-up when applicable.
24-Hour Rush Repair
Hydraulic cylinder bench · Fontana, CA
Komatsu Hydraulic Cylinder Repair in Fontana
Komatsu machines earn their keep on cylinder power — the boom that holds a load, the blade that holds a grade, the bucket that has to crowd without drifting. When a Komatsu cylinder starts bypassing, weeping at the rod or losing strength, our Fontana cylinder bench rebuilds it in-house: full teardown, measurement of rod, barrel and piston, and the machine work to put it back to spec under the same roof.
Hydraulic cylinder bench · Fontana, CA
Komatsu cylinders for excavators, dozers and loaders
We rebuild the cylinders that do the heavy work on Komatsu excavators, wheel loaders, dozers and backhoes — boom, stick, bucket, lift, tilt, blade and steering cylinders. Each one is stripped and measured before it is quoted: barrels are honed back to finish, scored or bent rods are re-chromed or manufactured new on our own machines, and the cylinder is reassembled with seals matched to its duty, then pressure-tested before it leaves the bench.
Brands we serviceKomatsuCaterpillarHitachiVolvoJohn DeereCaseBobcat
Komatsu Hydraulic Cylinder Repair in Fontana · Fontana, CA
Komatsu wheel loader hydraulic cylinder repair at LA Trucks and Tractors in Fontana
Measured first, quoted honestly
A Komatsu cylinder that drifts under load is telling you something specific — internal bypass past the piston seals, a scored barrel, or a rod problem — and each cause has a different repair. We find the actual one at teardown and quote exactly that work, nothing padded onto it. Regular hours are Monday–Friday 6 AM–5 PM; the rush line runs 24 hours a day, every day of the year, and quotes, pick-up and delivery are free — you talk directly with John Clark.
- Excavator boom, stick and bucket cylinders
- Wheel loader lift and tilt cylinders
- Dozer blade, tilt and ripper cylinders
- Barrel honing and rod manufacture in-house
- Reseal, rebuild and pressure testing
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
My Komatsu excavator boom settles overnight. What is wrong?
Settling usually means internal bypass in the boom cylinder — worn piston seals or barrel scoring letting oil past the piston. We strip and measure the cylinder and quote the repair it actually needs.
Can you rebuild a Komatsu cylinder with a bent rod?
Yes. A bent rod is manufactured new to the original dimensions in our own shop rather than straightened, and the cylinder is rebuilt and pressure-tested around it.
Related services
Emergency breakdown? Call the 24-hour rush line.
(949) 400-2937Schedule service or open a repair order
Request a service call.
Include the make, model, symptoms, location, urgency and preferred service time. Your details open in a text to John so you can review them before sending.