Hydraulic cylinder repair
We repair hydraulic cylinders from BelAZ and other mining trucks, excavators, cranes, dozers, loaders and presses — from diagnostics to pressure testing. We fix the cause of the fault, not just the symptoms.
Repair services
Every cylinder is inspected for defects; the list of work and the price are agreed with you before the repair starts.
Diagnostics
Visual inspection, disassembly and measurement: we assess the rod, barrel, piston and seals, and the degree of bending and wear.
Seal replacement
Rod and piston seals, wiper and guide rings are chosen for the operating conditions (NBR, PU, FKM, PTFE).
Rod restoration and hard chrome
Scored, corroded or worn rod surfaces are restored, ground and hard-chrome plated; a bent rod is straightened or replaced.
Barrel honing
Scoring and ovality of the bore are removed by honing, restoring the accuracy and finish the seals need.
Pistons and end caps
Worn or broken pistons, heads, caps and rod guides are remade to drawing or measurements.
Parts to sample or drawing
No drawing? We measure the old part and make a new one: rod, barrel, eye, nut, bushing.
Assembly and pressure test
The cylinder is assembled in clean conditions and tested under pressure for leaks, smooth travel and dimensions.
Machines whose cylinders we repair
BelAZ and mining dump trucks
Body hoist (telescopic and multi-stage), steering and suspension cylinders.
Excavators
Boom, arm (stick) and bucket cylinders.
Cranes
Boom luffing and telescoping cylinders, outrigger cylinders.
Dozers
Blade lift and tilt cylinders, ripper cylinders.
Loaders
Boom and bucket cylinders of wheel loaders.
Presses and industrial equipment
Large-bore cylinders for presses, clamping and holding mechanisms.
How the repair works
Six steps — the result of each one is agreed with you.
- 1. Intake. We receive the cylinder and record the machine model and fault description.
- 2. Diagnostics. We disassemble, clean and measure every part.
- 3. Defect report and quote. We agree in writing on the cause, the list of work and the price.
- 4. Repair. We restore the rod, barrel and other parts and replace the seals.
- 5. Testing. The assembled cylinder is pressure-tested for leaks and smooth travel.
- 6. Handover. You get the cylinder back with the test results and a list of work done.
Signs your hydraulic cylinder needs repair
If you notice any of these, have the cylinder checked without delay: a small fault can eventually ruin the rod, the barrel or the whole mechanism.
- 1Oil leaks — A worn rod seal or wiper lets oil run along the rod, leaving stains under the machine.
- 2Scored or rusty rod — Damaged chrome cuts the seal, and the leak quickly gets worse.
- 3Bent rod — After a side load or impact the rod bends: travel gets harder and the seal wears on one side.
- 4Loss of force — Oil bypasses the piston seal from one chamber to the other (internal leakage): the load won’t lift or drifts down by itself.
- 5Jerky movement — The rod jerks or slows down: a worn bore, air in the system or worn guides.
- 6Worn eyes and pivots — The mounting eye bore becomes oval and play appears, increasing knocking and shock loads.
What to send with your request
The more we know, the faster and more accurate our answer:
- Machine make and model (e.g. BelAZ, excavator or crane model)
- Cylinder position and function: body hoist, boom, bucket, etc.
- If known: rod and bore diameter, stroke, working pressure
- Fault description: since when and how it shows
- Photos of the whole cylinder and of damaged areas
- Drawing or serial number (if available)
Maintenance tips
- Regularly check the rod for scoring, rust and coating damage.
- Watch for oil leaks and the condition of the seals.
- Keep the hydraulic oil clean and the filters in good condition.
- Check mounting points, pins and pivots for wear.
- Avoid excessive side loads on the rod.
- Keep working pressure and temperature within the manufacturer’s limits.
- When a fault appears, don’t just replace the seals without finding the cause.
Safety: before any repair, release system pressure safely and secure raised loads with an independent mechanical support.
Frequently asked questions
How much does hydraulic cylinder repair cost?
The price is set after diagnostics and the defect report: it depends on the damage, the seals to replace, the work needed on the rod and barrel, and any spare parts. We agree the price with you before starting.
How long does a repair take?
It depends on the cylinder size, the type of fault and whether parts need to be made. We give an exact time after the defect report.
Is replacing the seals enough?
Not always. If the rod is scored, the barrel worn or the rod bent, new seals will fail quickly. That’s why we find the cause first.
Can a bent rod be restored?
Depending on the bend and the condition of the steel, the rod is straightened or a new one is made. The decision follows measurement and diagnostics.
Can you make a part without a drawing?
Yes. We measure the old part and make the new one from it. A drawing or factory documentation speeds things up.
Is the cylinder tested after repair?
Yes. The assembled cylinder is checked under pressure for leaks, smooth travel and dimensions.
Do you repair BelAZ cylinders?
Yes, we repair body hoist, steering and suspension cylinders of BelAZ and other mining trucks. Please state the truck model and cylinder position in your request.
Does your hydraulic cylinder need repair, or do you need a new one?
Send the machine model, main dimensions and a description of the fault — our specialist will contact you to agree on the scope of work and next steps.