# Sany Construction Machinery Service – Repair of Excavators, Loaders, and Diesel Engines

> Professional service for Sany machines offers hydraulic repairs, engine overhauls, and mobile technical support with a 12-month warranty. Trust the WIBAKO experts and take advantage of comprehensive service throughout Poland.

### Professional Sany Machinery Service

## Hydraulic repairs, engine overhauls with dynamometer testing, mobile service, and 12-month warranty

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- **Phone**
  +48 33 870 42 00
  [Call us](tel:+48338704200)
- **WhatsApp**
  +48 532 161 000
  [Message on WhatsApp](https://wa.me/48532161000)
- **E-mail**
  biuro@wibako.pl
  [Send an e-mail](mailto:biuro@wibako.pl)

Trust WIBAKO Experts

### Professional Technical Support for Sany Construction Equipment

Sany construction machinery — from agile mini excavators and heavy crawler excavators to efficient wheel loaders and cranes — has gained immense popularity on Polish construction sites thanks to its powerful breakout force, advanced hydraulic systems, and high fuel efficiency. However, intensive operation in tough ground conditions, high cyclic loads, and working in heavy dust place extreme demands on all mechanical, hydraulic, and drive systems.

Even the most state-of-the-art components eventually undergo frictional wear and oxidation. Common Rail injection system failures, volumetric efficiency drops in hydraulic pumps, or planetary gear leaks result in immediate machine downtime. We fully understand that every delay on a construction site causes severe financial losses and risks contractual penalties.

At **WIBAKO**, we provide comprehensive technical support both stationary at our modern service center and mobile, reaching directly to the site of the breakdown. Thanks to our deep knowledge of Sany machine architecture, we accurately diagnose faults and restore machinery to full factory performance.

Sany Service

### Fluid Power Hydraulics Department

In our specialized Fluid Power Department, we recondition and repair key hydrostatic components. Our experts restore factory operating parameters for components such as:

**Piston and gear pumps —** precision plate grinding, replacement of rotating groups and pistons.

**Hydraulic motors (hydromotors) —** reconditioning of final drives (travel drives) and swing drives.

**Control valves and main control blocks —** spool reconditioning, seal replacement, and precise relief valve calibration.

**Hydraulic cylinders —** gland replacement, manufacturing of new piston rods and cylinders.

12-Month Warranty

### Internal Combustion Engines Department

We specialize in major overhauls of Diesel power units used in construction machinery (including Isuzu, Yanmar, Cummins, Deutz). Our Engine Department has a complete machining facility, enabling us to perform all mechanical work in-house:

Crankshaft grinding and engine block line boring.

Cylinder liner boring and honing.

Comprehensive cylinder head reconditioning (resurfacing, guide and valve replacement).

Repair and calibration of Common Rail injection systems and turbochargers.

### When to React?

### Engine Failure Symptoms

Sany construction machinery operates in extremely demanding environments, subjecting its power units to continuous, heavy loads. Ignoring early signs of engine wear in a Sany excavator, loader, or dumper drastically reduces equipment lifespan and causes massive costs due to unplanned downtime.

**Below are the most critical warning signs indicating that your Sany machine's engine requires urgent inspection or service:**

**Unusual exhaust smoke color —** heavy black smoke appearing under high load usually points to a turbocharger or injection system fault. A bluish exhaust tint indicates oil burning, while white smoke suggests coolant leaking into the combustion chambers.

**Noticeable drop in performance under load —** manifests when Sany equipment loses power and visibly weakens when scooping material, with RPM dropping sharply when operating hydraulics and travel systems simultaneously.

**Starting difficulties (cold and warm) —** extended cranking times during cold morning starts or trouble restarting the engine after heavy operations.

**Unstable operation and abnormal noises —** RPM surging at idle, noticeable engine shuddering, and any knocking, pinging, or metallic sounds coming from the engine compartment.

**Excessive crankcase pressure (blow-by) —** heavy smoking or oil blow-by from the breather or oil filler cap, directly proving worn piston rings or cylinder walls.

**Coolant or oil loss —** steady drop in fluid levels requiring frequent topping up, even without visible external leaks.

What to Look For?

### Symptoms of Damaged Hydraulics

The hydraulic system in Sany machines is the heart of their immense power and operating precision. Severe work in harsh conditions leads to gradual wear of critical components, such as axial piston pumps, control valves, or hydraulic motors. Promptly recognizing warning symptoms prevents contamination of the entire system with metal shavings. We also perform professional reconditioning of hydraulic pumps for Sany dumpers and other construction machinery, restoring factory operating pressure and flow capacity.

**Here are the main symptoms indicating a hydraulic system fault in a Sany machine:**

**Significant drop in efficiency as temperature rises** — the machine works properly right after start-up, but as hydraulic oil heats up, it slows down noticeably, loses power, and moves jerkily.

**Lack of power in boom and bucket** — the Sany machine is unable to lift loads or penetrate hard ground, accompanied by loud noise from relief valves struggling to maintain pressure.

**Maneuvering and travel difficulties** — Sany excavator or dumper veers off track, struggles to climb slopes, or one of the travel motors clearly loses power.

**Immobilization or slow movement of a specific function** — most hydraulic functions work fine, but one specific cylinder responds sluggishly or not at all, pointing to a valve spool section failure or seal damage.

**Abnormal noise from the main pump** — loud metallic grinding, knocking, or whining near the pump, usually caused by cavitation or internal component seizure.

**Rapid oil temperature increase** — hydraulic fluid overheats rapidly, leading to loss of lubricating properties and fast degradation of seals throughout the system.

**Metal shavings in the filter** — silvery coating or fine metal particles caught in the hydraulic filter serve as a last-chance warning before total system destruction caused by a damaged pump.

Advanced Diagnostic & Testing Facilities

### Hydraulic Test Benches & Engine Dynamometer

We don't do half-measures — every reconditioned hydraulic component and internal combustion engine undergoes rigorous testing on specialized test stations before being reinstalled on the machine.

For fluid power hydraulics, we perform pressure testing under working loads exceeding **400 bar**, guaranteeing precise measurement of volumetric efficiency, flow rate, and complete system tightness. Meanwhile, every overhauled engine goes to our **stationary engine dynamometer**, where it undergoes hours of controlled break-in and dynamic load testing. By real-time monitoring of power, torque, oil pressure, and temperature parameters, we deliver a power unit 100% ready for extreme work on the construction site.

On-site service throughout Poland

### Sany Mobile Machinery Service

When a breakdown prevents safe transport of the machine to our stationary workshop, we dispatch our Mobile Service directly to the location specified by the client. We operate a fleet of fully equipped service vehicles, allowing us to perform full computer fault diagnostics for ECU controllers and in-depth hydraulic system analysis without removing the machine from the job site. On-site, we perform precise working and signal pressure measurements in Load Sensing (LS) systems, quickly locate and repair leaks, and manufacture and replace damaged high-pressure hoses. If a fault requires deeper workshop intervention, our service technicians efficiently dismantle affected components — such as pumps, hydraulic motors, or cylinders — and transport them safely to our service center for reconditioning.

### Table of Supported Sany Machinery Models

| **Sany Machine Type** | Popular models | Most common service and support areas |
| --- | --- | --- |
| Mini Excavators & Compact Excavators | SY16C, SY26C, SY35U, SY50U, SY80U | Piston pump reconditioning, final drive repair, pin and bush clearance elimination on kingpost and boom, Yanmar engine service |
| Wheeled Excavators | SY155W | Drive axle service, travel hydromotor reconditioning, gearbox repair, swivel joint (center joint) sealing |
| Heavy Crawler Excavators | SY135C, SY215C, SY305C, SY365H, SY500H | Major overhauls of Isuzu and Cummins engines, Kawasaki/Kayaba hydraulic system reconditioning, swing gear reconditioning |
| Wheel Loaders | SW305, SW405 | Powershift transmission diagnostics and service, torque converter reconditioning, steering and bucket cylinder sealing, engine repair |
| Cranes & Material Handling Machines | SAC1300T, SYT80, SMGW series | Hydraulic winch overhauls and reconditioning, variable displacement pump repair, boom telescoping system sealing |

12-Month Warranty

### Complete Safety Guarantee

We take full responsibility for the quality of our services. We use only proven spare parts, conduct precise dimensional checks, and verify operational parameters on test stations.

We provide a **12-month written warranty** for all major combustion engine overhauls performed by us.

### Will I receive a quotation for approval before the repair begins?

Yes, absolutely. Every component or engine delivered to us is first inspected and disassembled for diagnostic purposes. Based on the findings, we prepare a detailed cost estimate, including a list of parts to be replaced and the scope of mechanical work required. We only begin the repair work once we have received your full approval.

### Do you provide on-site breakdown assistance throughout Poland?

Yes, our Mobile Service covers service requests throughout the country. Our fully equipped service vehicles allow us to perform computer diagnostics, pressure measurements, and minor to medium repairs directly at the customer's construction site.

### Do you use genuine parts or aftermarket replacements for engine and hydraulic system overhauls?

We always strive to provide the best value for money. As standard, we use OEM components.

Published: 2026-10-14

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Source: https://wibako.com/about-us/technical-hub/888-sany-construction-machinery-service-repair-of-excavators-loaders-and-diesel-engines
Contact: +48338704200, biuro@wibako.pl