Description

FIAT Kobelco EX255, EX285 2002 Technical Manual

You have a FIAT Kobelco EX255 or EX285 on your lot that’s down because nobody can figure out why the main pump won’t make pressure. The aftermarket PDF you grabbed last week told you to “check the regulator,” but didn’t show you the hydraulic circuit or the spring cavity orientation. That’s the difference between a reprint and the real 972-page Technical Manual FIAT Kobelco put out in 2002. This is the document the factory technicians used when these machines were built. If you want to fix it right, you start here.

What’s Inside the 972 Pages

This manual isn’t some cobbled-together copy. It’s the original OEM file – scanned from the official FIAT Kobelco printed book. The table of contents breaks down into three volumes bound together: the Principio de Funcionamiento (operating principle), Diagnóstico de Inconvenientes (troubleshooting), and the Instrucciones para las Reparaciones (repair instructions). You get the full picture, not just a hand-wavy overview.

Grupo 1 under General covers every machine dimension and engine data spec for both the EX255 and EX285. Need the motor torque curve? Page 73 lists DATOS MOTOR EX255 and DATOS MOTOR EX285 with exact numbers. The electrical installation drawings in Grupo 2 show every fuse location, battery tray layout, and switch panel circuit. I’ve seen guys chase a parasitic drain for days because they were working from a generic wiring diagram. This manual ends that.

Hydraulic Circuits: The Heart of the Machine

The “Instalaciones” section – Grupo 2 Hidráulicas – is where this thing earns its keep. It covers the main circuit, servocontrol circuit, neutral circuit, single-service operation, and combined operation. If you’ve ever had a boom that drifts or a swing that jerks, the answer is in the VALVULA COMBINADORA DE CAUDAL or the VALVULA DE RECIRCULACION PENETRADOR. The manual walks through each valve function with flow paths. That’s not something you get from a parts diagram.

3 Critical Systems Covered

• Electrical System: Starting circuit, cold-start assist, load protection, motor stop – all with the ignition switch positions drawn out. No guesswork on which wire feeds the ECM.
• Pump and Regulator: The BOMBA PRINCIPAL, REGULADOR, SENSOR DE REGIMEN MOTOR (Sensor N), and pressure sensor are all explained with theory and test points.
• Swing and Travel: Motor de Rotación, freno de estacionamiento torreta, reductor – plus the travel motor and parking brake valves. Torque specs for the bolts holding the final drive? They’re in there.

Diagnostics: How to Test, Not Just Replace

The Diagnóstico de Inconvenientes section starts with a full PRUEBA DE PRESTACIONES (performance test). You get standard performance tables for both the EX255 and EX285, including P-Q curves for the main pumps. The manual tells you how to prepare the machine for testing, what gauges to hook up, and what readings are acceptable. If the machine pulls to one side during travel, the troubleshooting flowchart pinpoints the VALVULA DE FRENO TRASLACION or the motor’s internal leakage. This is the kind of diagnostic logic that keeps you from swapping parts all afternoon.

Source Authenticity – Why OEM Matters

I’ve been a mechanic for 28 years. Aftermarket manuals love to omit the page that says “tighten to 87 ft·lb” and instead write “tighten securely.” That gets a bolt snapped. This manual is the original FIAT Kobelco engineering release – printed in July 2002 by FIAT KOBELCO CONSTRUCTION MACHINERY S.p.A. in Italy. Every torque value, every shim thickness, every hydraulic pressure is factory-sourced. If it says 14.7 MPa on the pressure relief valve, that’s what you set it to. No translation errors. No “equivalent” specs. You want to rebuild a swing motor without guessing the internal clearance? This manual gives you the standard and limit dimensions.

Related manuals you might need for the rest of the fleet: FIAT KOBELCO EX255 EX285 Workshop Manual covers the repair procedures themselves. FIAT Kobelco W80 2004 Technical Manual – 46-Page OEM Factory Specs if you have a wheeled loader. FIAT Kobelco 7055-3F Technical Manual – 24-Page Factory Specs for a compact excavator. And if you’re diving into transmission work, Manual Transmission might help (though this excavator uses hydrostatic drive – that link is for gearboxes).

FAQ

Does this manual cover the Tier 2 emissions system?

Yes. The manual is labeled “Tier 2” on page 1 and includes the engine controls and fuel injection circuits. The cold-start assist circuit (AYUDA AL ARRANQUE EN FRIO) is covered under the electrical installation section.

Can I get torque specs for the cylinder head bolts from this PDF?

The engine data in Grupo 1 includes DATOS MOTOR for both EX255 and EX285, but the specific cylinder head torque is in the repair instructions volume. That volume is bundled in this 972-page file – you’ll find it under “Manual de Instrucciones para las Reparaciones.” No separate purchase needed.

Is the wiring diagram color-coded?

Not in color because it’s a scanned original. But every wire is labeled with a tag number, and the component locations are drawn for the cab, battery tray, and fuse panel. If you know how to read a black-and-white schematic you’ll be fine.

How do I access the swing brake adjustment data?

Go to Grupo 2 – Dispositivo de rotación – sub-section FRENO DE ESTACIONAMIENTO TORRETA. The adjustment shim thickness and bolt torque are listed in the tables. Follow the removal procedure to get to the brake pack.

You need this PDF on your shop tablet or printed out next to the machine. FIAT Kobelco didn’t write this to be a coffee-table book. They wrote it so you don’t blow a hydraulic line or strip a thread. Access the Factory Manual and get the job done with the right numbers the first time.