Hydraulic Cylinder Repair & Rebuild In Southern California
Professional hydraulic cylinder repair, seal replacement, honing, and full cylinder rebuilds for tow trucks, wreckers, rollbacks, and commercial rigs — serving towing companies and owner-operators across LA, San Bernardino, Orange & Riverside Counties. Free estimates.
What Is Hydraulic Cylinder Repair And When Do You Need It?
Hydraulic cylinders are the muscle of the tow truck — they convert hydraulic pressure into the mechanical force that lifts the bed, extends the boom, operates the underlift, and drives every other piece of working equipment on the rig. A tow truck typically runs multiple cylinders simultaneously under high loads, in harsh environments, and through thousands of cycles per year. That operating environment wears cylinders out — and when a cylinder fails, the function it controls stops completely.
The most common cylinder failures on tow trucks are seal failures — the internal seals that prevent hydraulic fluid from bypassing the piston. When seals fail, the cylinder loses pressure and the function it controls becomes slow, weak, or unresponsive. Cylinder bores can also become scored or corroded from contaminated fluid, which accelerates seal wear and reduces the cylinder's ability to hold pressure. At Quik Tow Repair, we repair and rebuild hydraulic cylinders in-house — replacing seals, honing bores back to the bore specifications and pressure ratings in Parker Hannifin cylinder specifications, and rebuilding cylinders at the component level.
We work on all hydraulic cylinders found on tow trucks — bed lift cylinders, boom cylinders, underlift cylinders, and winch cylinders on flatbeds, wreckers, rollbacks, and integrated units. We also inspect the hydraulic system for the underlying cause of cylinder failure — because a cylinder that fails repeatedly usually has a system-level issue driving the failure.
Hydraulic Cylinder Repair & Rebuild Services We Offer
Every cylinder repair is performed in-house at our Pomona shop. We repair, hone, and rebuild — and always check the hydraulic system for the underlying cause of the failure.
01Cylinder Seal Replacement
The most common cylinder repair — internal seals fail from age, heat, contaminated fluid, or excessive pressure. A cylinder with failed seals loses the ability to hold pressure and the function it controls becomes weak or unresponsive. We replace all seals, o-rings, and wiper seals on all cylinder types and sizes found on tow trucks.
- ✓Piston seal replacement
- ✓Rod seal & wiper replacement
- ✓O-ring & backup ring service
- ✓End cap seal replacement
- ✓Pressure test after seal replacement
02Cylinder Bore Honing
A scored or corroded cylinder bore accelerates seal wear and prevents the cylinder from holding proper pressure even with new seals. Honing restores the correct surface finish to the bore — allowing new seals to seat correctly and the cylinder to hold pressure as designed. We hone cylinder bores on all tow truck cylinder sizes.
- ✓Bore condition inspection & measurement
- ✓Precision honing to correct surface spec
- ✓Diameter verification after honing
- ✓New seal fitment check
- ✓Post-honing pressure test
03Full Cylinder Rebuild
When a cylinder has multiple issues — failed seals, a scored bore, worn rod, or damaged end caps — a full rebuild is more cost-effective than replacing individual components one at a time. We disassemble the cylinder completely, inspect every component, replace all wear items, hone the bore if needed, and reassemble to spec.
- ✓Complete disassembly & inspection
- ✓All seals, o-rings & wear items replaced
- ✓Bore honing if required
- ✓Rod inspection & polish if needed
- ✓Full assembly and pressure test
04Cylinder Rod Repair & Replacement
A bent, scored, or pitted cylinder rod causes seal failure regardless of how many times you replace the seals. A damaged rod needs to be straightened, polished, chrome-repaired, or replaced — depending on the severity of the damage. We assess cylinder rods and recommend the most cost-effective repair approach.
- ✓Rod condition inspection & measurement
- ✓Rod straightening if bent
- ✓Chrome repair for surface scoring
- ✓Full rod replacement if needed
- ✓Seal verification after rod repair
05Cylinder Leak Diagnosis & Root Cause
A cylinder that keeps failing after repairs usually has an underlying system issue — excessive pressure, contaminated fluid, or a malfunctioning valve causing pressure spikes. We diagnose the root cause of recurring cylinder failures and address the system-level issue so the rebuilt cylinder stays working.
- ✓System pressure check vs. cylinder rating
- ✓Fluid condition & contamination assessment
- ✓Valve function check for pressure spikes
- ✓Full system diagnosis report
- ✓Root cause addressed before rebuild
06New Cylinder Supply & Installation
When a cylinder is beyond economical repair, we source and install a replacement unit matched to the original cylinder's specifications — bore diameter, stroke length, port size, and mounting configuration. We install and test the new cylinder as part of the same job.
- ✓OEM-spec cylinder sourcing
- ✓Correct bore, stroke & port matching
- ✓Mounting hardware & line connection
- ✓Full system pressure test after install
- ✓Warranty documentation provided
Why SoCal Towing Companies Choose Quik Tow Repair For Cylinder Work
In-House Rebuild Capability
We rebuild cylinders at the component level in our Pomona shop. Seal replacement, bore honing, rod repair — all done in-house without outsourcing to a hydraulic specialty shop.
Tow Truck Cylinders Only
We work exclusively on tow trucks. We know the cylinder configurations on every major tow rig type and understand the operating pressures and duty cycles they run under.
Root Cause First
A cylinder that fails repeatedly has a system-level cause. We diagnose the full hydraulic system alongside every cylinder repair to identify pressure, fluid, or valve issues that are driving the cylinder failure.
Fast Turnaround
Most cylinder seal replacements are same day or next day. Full rebuilds take 1–3 days. We give you a clear timeline at the estimate and prioritize cylinder failures because they take functions completely offline.
Pressure Tested Always
Every cylinder we rebuild or repair is pressure tested before it goes back in the truck. You don't get a repaired cylinder that hasn't been verified to hold pressure under working conditions.
Fleet Accounts
Fleet operators with 2+ trucks get priority cylinder repair scheduling, volume pricing, and proactive cylinder inspection programs to catch seal wear before full failure.
How Hydraulic Cylinder Repair Works At Our Shop
From your first call to a pressure-tested, rebuilt cylinder back in your truck — here is what to expect.
Call 888-628-4008 or submit our form. Tell us which cylinder is failing — what function it controls and what it's doing. We confirm availability and call you back same day.
We remove the cylinder, inspect it fully — bore, rod, seals, and end caps — and check the hydraulic system for any root cause issues. You receive a written assessment covering the cylinder condition, the recommended repair, and any system findings.
No work starts without your approval of the written estimate. We rebuild the cylinder, hone the bore if needed, replace all seals and wear items, and verify assembly before reinstalling.
Rebuilt cylinder is pressure tested before reinstallation. After reinstall we run the full function under load to verify correct operation. Written service report provided. Truck is verified before pickup.
Cylinder Repair For Towing Companies & Owner-Operators
Towing Companies & Fleets
Cylinder failures take individual functions offline — a failed bed cylinder means no flatbed operation, a failed boom cylinder means no wrecker lift. Fleet operators need fast cylinder repair with root cause diagnosis to prevent the same failure from recurring across multiple trucks.
- ✓Priority scheduling on cylinder failures
- ✓Root cause diagnosis on every rebuild
- ✓Volume pricing for 2+ trucks
- ✓Proactive cylinder inspection program
- ✓Fleet cylinder history on file
- ✓Full hydraulic system check included
Owner-Operators
A failed cylinder stops one of your core functions — bed, boom, or winch. We diagnose the cylinder and the system behind it, rebuild it right the first time, and pressure test it before putting it back in your truck. No repeat failures from missed root causes.
- ✓Free written estimate before any work
- ✓Cylinder and system diagnosis together
- ✓Same-day or next-day seal replacements
- ✓Pressure tested before reinstall
- ✓Root cause addressed — not just the seal
- ✓No additional charges without approval
Hydraulic Cylinder Repair Across SoCal
Our Pomona shop serves towing companies and owner-operators across all four Southern California counties. Cylinder failures get priority — call us first.
Also serving: Pomona · Ontario · Fontana · Rancho Cucamonga · Riverside · Corona · Anaheim · Santa Ana · Fullerton · Moreno Valley · Covina · West Covina
Related Hydraulic, PTO & Cylinder Services
Cylinder repair is one part of our complete hydraulic silo. These services are commonly needed alongside cylinder work.
💧Hydraulic System Repair
Full system diagnosis, pump repair, lines, and fluid service.
Learn more →
⚙️PTO Repair & Installation
PTO diagnosis, rebuild, and new installation.
Learn more →
🔩Winch Repair
Winch hydraulic and mechanical repair for all tow truck winch types.
Learn more →
🔧Valve Repair
Control valve repair — often the root cause of recurring cylinder failures.
Learn more →
🔧Chassis & Suspension
Full chassis and suspension repair — often needed alongside hydraulic work.
Learn more →Hydraulic Cylinder Repair & Rebuild — Frequently Asked Questions
Straight answers about cylinder repair and rebuilds, turnaround times, and what to expect when you bring your truck to Quik Tow Repair.
Cylinder Failing? We Rebuild It Right The First Time.
Call us or submit a quote. We respond within 1 business hour, diagnose the cylinder and the system behind it, and pressure test every rebuild before it goes back in your truck.