Service and Repair of CAT Construction Machinery
Precise diagnostics instead of guessing. Entrust CAT service to professionals.
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+48 33 870 42 00
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+48 532 161 000
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biuro@wibako.pl
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Caterpillar Machinery Repair
Contact a Caterpillar (CAT) Service Expert at WIBAKO
Are you facing a drop in power in a Caterpillar CAT 320 excavator, a CAT/Rexroth piston pump breakdown, CAT C7.1 engine smoking, or do you need immediate mobile service intervention directly at your job site? Our specialists are at your disposal.
Call us or send an inquiry - we will select the most suitable solution and prepare a repair quote within 24 hours.
Excavator, Wheel Loader, and Power Hydraulics Repair
Caterpillar Service
Professional technical service for Caterpillar (CAT) construction machinery at WIBAKO includes detailed diagnostics, mobile field repairs, and complete overhauls of hydraulic pumps and CAT / Perkins power units. We eliminate faults related to pressure drops in PPPC systems, leaks from final drives, or power loss under load in crawler excavators, wheeled excavators, bulldozers, and wheel loaders from the CAT 300, M300, 900, and D series. Thanks to our stationary hydraulic and engine dynamometers, every remanufactured component and engine goes back to the machine after verified pressure and flow testing under full operating load.
Caterpillar (CAT) Machinery Overview and Scope of Service
| Machinery Category | Supported Caterpillar Models | Key Components / Engines | WIBAKO Service Scope |
| Mini Excavators and Compact Excavators |
• CAT 301.7 / 302.7 CR
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• CAT C1.1 / C1.7 / C2.4 / C3.3B engines
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• Nabtesco / Kayaba final drives and travel motors • Pilot hydraulics calibration
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| Wheeled Excavators |
• CAT M313D / M315F
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• CAT C4.4 ACERT / C6.6 ACERT engines
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• Control system fault diagnostics
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| Medium Crawler Excavators |
• CAT 312D / 313F
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• CAT C4.4 / C6.6 / C7.1 ACERT engines
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• Pump testing on a stationary dynamometer
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| Heavy and Demolition Crawler Excavators |
• CAT 330F / 336D / 336F / 336 (Next Gen)
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• CAT C9.3 / C13 / C15 ACERT Stage V engines
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• Regeneration of swing motors
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| Wheel Loaders (900 Series) |
• CAT 906M / 908M / 924K
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• CAT C4.4 / C7.1 / C9.3 ACERT engines
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• Powershift transmission repairs
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| Older Dozer / Excavator Series (D Series) |
• CAT D3K2 / D5K2
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• CAT C4.4 / C7.1 / C9.3 / C15 engines
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• Hydrostatic drive calibration
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Pumps, Motors, and Control Valves
Comprehensive Caterpillar Power Hydraulics Service
Comprehensive Caterpillar power hydraulics repair at WIBAKO includes thorough diagnostics, seal replacement, and full rebuilds of piston pumps, swing and travel motors, as well as multi-section main control valves. We repair hydraulic systems with PPPC pressure and flow compensation, as well as digital control systems used in machines ranging from CAT 303.5 mini excavators to CAT 352F heavy demolition excavators and CAT D8T dozers. Every remanufactured pump and hydraulic motor undergoes mandatory load tests on WIBAKO's stationary test bench, ensuring the restoration of nominal working pressure of 35.0–38.0 MPa and factory efficiency before reassembling the component into the machine.
Comprehensive hydraulic pump repair
Diagnostics and regeneration of CAT / Rexroth main pumps
A key element of the hydraulic system in Caterpillar equipment are dual-section or multi-section variable displacement piston pumps. In machines such as the CAT 320D, CAT 323F, or CAT 336E, components from the A8VO, A10VO, A10VSO series, and original CAT units mostly operate. Progressive frictional wear of rotating elements caused by degraded oil, contamination, or system overheating manifests as a drop in efficiency, high-pressure line vibrations, and characteristic loud pump noise under load.
In our workshop, the Caterpillar main pump rebuild procedure follows strict technological guidelines:
Verification and micro-measurements: The component is disassembled and cleaned in ultrasonic washers. We measure the wear level of the cylinder block, pistons, valve plate, piston shoes, and swashplate cradle.
Replacement of wearing parts: Worn parts are replaced with brand-new, high-precision components. We replace the entire set of Viton seals, main shaft bearings, and elements responsible for controlling the swashplate angle.
Pressure and flow regulator reconditioning: We refit and calibrate LS control valves and torque limiters, which ensure an even power distribution between the hydraulics and the CAT C4.4 / C7.1 ACERT engine.
PPPC main control valve and relief valve servicing
Service and relief valve maintenance
Multi-section main control valves used in Caterpillar excavators are complex valve blocks operating with extremely tight spool tolerances. In PPPC systems, even a negligible internal leak across a spool or a compensator malfunction results in boom drift, attachment jerking, or the inability to perform smooth combined movements.
We resolve issues related to erratic attachment operation, lack of maximum pressure, and external leaks through:
Precise grinding and fitting of control spools to the valve body
Replacement and adjustment of main relief valves to the correct pressure settings
Remanufacturing and calibration of load-holding and anti-shock valve sections, which protect the cylinders against sudden pressure spikes
Comprehensive Hydraulic Motor Service
Final Drive and Swing Motor Repair
Issues related to machine travel - such as reduced track pull force in a CAT 312D, the excavator pulling to one side, sluggish movement in hydrostatic loaders, or the inability to swing the upper structure on slopes with a loaded bucket - typically result from damaged travel or swing hydraulic motors.
At WIBAKO, we offer full-service repair for piston hydraulic motors and travel motors with integrated planetary gearboxes (final drives) used in CAT machinery:
Swing Motors: We replace valve plates and multi-disc brakes, and repair pinion shafts driving the swing gear.
Final Drives: We remanufacture two-speed piston motors, replace planetary gears, planet carriers, and Duo-Cone floating seals to prevent gear oil leaks and stop dust from entering the operating environment.
Guaranteed Performance
Load Testing on the WIBAKO Stationary Hydraulic Test Bench
What sets WIBAKO apart is the complete elimination of the risk of installing an untested component. No Caterpillar hydraulic pump or motor leaves our facility without a full inspection on a stationary test stand. During the bench test, we simulate actual operating conditions by heating the hydraulic oil to a working temperature of 50–60°C. We measure actual volumetric and mechanical efficiency, check the response of pressure controls, and verify the absence of leaks at pressures reaching up to 40.0 MPa. Along with the remanufactured pump, the client receives an official test report featuring flow and pressure graphs, providing complete peace of mind that once installed, the equipment can immediately return to heavy-duty operation.
Comprehensive Caterpillar Engine Repair
Internal Combustion Engine Overhaul
Engine service at WIBAKO includes detailed diagnostics of Common Rail and HEUI systems, routine auxiliary equipment repairs, and complete overhauls of CAT and Perkins power units installed in Caterpillar machinery. We service engines such as the CAT C4.4, C6.6, C7.1, C9, and C9.3 ACERT. After repair, every unit undergoes mandatory start-up and testing on a stationary engine dynamometer, where we verify actual power, torque, compression pressure, and exhaust parameters under full working load.
Operational Characteristics and Challenges
Caterpillar / Perkins Power Units
Caterpillar ACERT diesel engines are the core power plant for most medium and heavy CAT construction equipment. These are technologically advanced units that comply with stringent emissions standards, featuring modern Common Rail injection systems or HEUI electro-hydraulic unit injectors, series or variable-geometry (VGT) turbochargers, EGR systems, as well as DPF and SCR exhaust aftertreatment systems.
Mechanics with Years of Experience
Scope of a Caterpillar Engine Overhaul at WIBAKO
At the WIBAKO workshop, the engine rebuild process is carried out in accordance with the manufacturer's official technical procedures:
Disassembly and Precision Inspection: The engine is completely disassembled. We perform micrometric measurements to check for cylinder liner ovality and wear, crankshaft journal dimensions, block alignment, and cylinder head mating surface flatness.
Machining: We perform professional engine block machining, crankshaft grinding along with selecting appropriate oversize main and rod bearings, and a complete cylinder head remanufacturing.
Fuel System and Turbocharging Rebuild: We recondition or replace components such as high-pressure pumps and injectors, assigning them the proper calibration codes.
Assembly: We reassemble the engine using brand-new pistons, rings, gaskets, and bearings, strictly adhering to precise torque specifications for cylinder head and connecting rod cap bolts.
Quality Assurance
Load Testing on a Stationary Engine Dynamometer
The key element that sets our service apart is eliminating the risk of installing an untested component. No Caterpillar engine leaves our facility after an overhaul without a full verification on a stationary engine dynamometer. During testing, we connect the power unit to an external load, bringing it up to its target operating temperature. We measure actual power output, torque, oil pressure, boost pressure, and combustion parameters. The client receives an engine that is fully broken in, tested, and ready for immediate operation in the machine.
Fault Symptoms
When Should a Caterpillar Machine Be Sent for Service Immediately?
Early identification of hydraulic or engine failure symptoms in Caterpillar machinery helps prevent a sharp spike in repair costs and avoids lengthy job site downtime. Most faults in PPPC / Load Sensing hydraulic systems and CAT ACERT power units show clear warning signs long before a complete breakdown occurs. Computer diagnostics, rapid pressure checks, and oil cleanliness analysis at the WIBAKO service facility allow us to pinpoint the issue at a stage where repairing a single component is sufficient, avoiding a costly full-system replacement.
Warning Table: Common Symptoms, Causes, and Risks of Continued Operation
| Symptom in Caterpillar Machine | Probable Technical Cause | Risk of Ignoring the Symptom |
| Loss of power and sluggish attachment operation after the oil warms up | Wear of cylinder block bores, pistons, or valve plate in the main pump (e.g., Rexroth A8VO). Internal oil leakage due to viscosity drop. | Hydraulic pump seizure, contamination of the entire valve block and cylinder system with metal filings. |
| Loud, "whining" hydraulic pump operation under load | Hydraulic oil cavitation, air leak on the suction side, clogged suction filter, or worn pump shaft bearings. | Permanent damage to the swashplate and cylinder block, driveshaft shearing. |
| Excavator pulls to one side while traveling | Damaged section in the travel motor, relief valve leak, or damaged final drive seals. | Damage to the planetary gear set, oil leakage, and complete loss of machine travel capability. |
| Black exhaust smoke and power loss when raising the boom | Damaged or seized Common Rail / HEUI injectors in the CAT C6.6 / C7.1 engine, variable geometry turbocharger (VGT) fault. | Piston crown burnout, injector tip melting, DPF/SCR filter damage, and necessity of a complete engine overhaul. |
| Erratic jerking or lack of response to joystick movements | Drop in pilot pressure, proportional solenoid valve fault, or damaged lock/holding valve. | Uncontrolled attachment movements, posing a direct threat to the operator and personnel on the job site. |
| Oil leaks around the track drive sprocket wheel | Wear or damage to the floating seal (Duo-Cone) in the final drive. | Gear oil drain out, planetary gear seizure, and destruction of the hydraulic motor housing. |
Fast Diagnostics and On-Site Repair
Caterpillar Mobile Service
Our mobile service for Caterpillar construction machinery provides full technical support directly at the job site. Equipped with mobile workshops, our experienced technicians cover the entire country, reaching cities such as Warsaw, Lublin, Poznań, Szczecin, Białystok, Wrocław, Łódź, and Gdańsk - with a special focus on southern Poland (Kraków, Katowice, Bielsko-Biała, Nowy Targ, Zakopane, Nowy Sącz) - minimizing machine downtime. We perform advanced computer diagnostics, hydraulic measurements under load, and precise field repairs for CAT 300, M300, 900, and D series wheeled and crawler excavators, loaders, and dozers.
Service Request Procedure and Response Time Aware of the financial losses resulting from Caterpillar machinery downtime on job sites, we prioritize emergency service requests. Thanks to our own spare parts warehouse - stocked with replacement pumps, seal kits, filters, undercarriage components, and complete injectors for CAT / Perkins engines - our field service team resolves the issue and restores your Caterpillar machine to working order on the very first site visit in most cases.
Over 30 Years of Industry Experience
Why Trust Us with Your Caterpillar Equipment?
Choosing WIBAKO guarantees reduced operating costs, minimized downtime, and technical reliability backed by hard measurement data. We combine over twenty years of experience in construction machinery repair with diagnostic facilities that are unique on a national scale. Rather than relying on trial-and-error component replacements, we deliver proven solutions dedicated to Caterpillar excavators, loaders, and dozers - from mini-excavators to heavy demolition and mining equipment.
In-House Engine and Hydraulic Test Benches: We do not subcontract work. Every remanufactured CAT/Rexroth main pump and CAT/Perkins internal combustion engine is tested on-site at our headquarters in Kojszówka.
Experienced Technicians: Our team consists of mechanics who have specialized exclusively in heavy construction equipment for years. We know the ins and outs of PPPC, Load Sensing, and CAT electronic engine control systems inside and out.
On-Stock Spare Parts Warehouse: We carry an extensive inventory of original parts as well as proven OEM replacements for CAT machinery. We also offer exchange programs for hydraulic pumps and engines - you return your faulty component and receive a fully operational unit at a significantly lower cost.
Quality Assurance: We provide a full warranty on every remanufactured hydraulic pump, motor, and overhauled engine.
Does the WIBAKO mobile service travel directly to the job site for Caterpillar excavator breakdowns?
Yes, our fleet of mobile service units reaches machinery directly on job sites across the entire country. Our field technicians are equipped with computerized diagnostic gear, high-pressure gauges, and field repair tools. They perform fault diagnostics, seal replacements, pressure adjustments, and remove damaged pumps or engines for workshop repairs.
Which Caterpillar equipment models does WIBAKO service?
We service the full range of Caterpillar construction, roadbuilding, and demolition machinery. We repair mini-excavators (e.g., CAT 301.7, 303.5, 308), wheeled excavators (e.g., CAT M313D, M315F, M318F, M320F), medium and heavy crawler excavators (from CAT 312 and 320D/E/F up to CAT 336, 349, and 390F), 900-series wheel loaders (e.g., 924K, 938M, 950M, 966M), and D3K to D8T series track-type tractors (dozers).
Does WIBAKO offer Caterpillar hydraulic pumps and internal combustion engines on an exchange basis?
Yes, we maintain an extensive inventory of remanufactured and fully tested components ready for immediate installation. To minimize machine downtime on site, we offer a service exchange program: you bring us your damaged component and immediately receive a fully remanufactured unit—dynamometer-tested and backed by a written warranty—at a much lower cost.
