Description

Fiat-hitachi 110, 125US, 110M, 135US, 120 Technical Manual – OEM Factory Troubleshooting

If you’ve ever been deep in a control valve rebuild on a ZAXIS 125US and realized the aftermarket PDF you obtained has the main relief pressure wrong by 50 bar, you know exactly why this page exists. I’m Mike Callahan, and I’ve been wrenching on construction equipment for 28 years. This Fiat-hitachi Technical Manual is the real factory file – 477 pages of the exact same material Hitachi gives its dealer techs. No condensed reprints. No generic spec sheets. This is the file that tells you the precise pilot pressure range before you crack a line.

Operational Performance Tests – What’s in Section 4?

Section 4 is where you live when you’re trying to figure out why your 110 won’t swing full speed or why the 135US tracks crooked. The manual breaks it into four parts: Introduction, Standard tables, Engine tests, excavator tests, component tests, and adjustments. You get operational performance standard tables for every model variant – ZAXIS110, 110M, 120, 125US, 135US, 135UR, 130, and 130LCN. Each table lists acceptable travel speeds, swing times, drift limits, and cylinder cycle times. The engine test section covers compression pressure, valve clearance adjustments, nozzle checks, and injection timing. No shade-tree guesses.

7 Excavator Models Covered – 110, 110M, 120, 125US, 135US, 135UR, 130, 130LCN

One manual, eight model designations. The Fiat-hitachi 110, 110M, 120, 125US, 135US, and 135UR are all covered in this PDF. Also includes the 130 and 130LCN. That means if you run a mixed fleet of Hitachi mid-size excavators, you’re not buying separate manuals for each serial number range. The component test specs – primary pilot pressure, secondary pilot pressure, solenoid valve set pressure – are listed individually per model. The 135UR has unique sections for the blade control valve and the bucket/cab collision prevention system. If you work on reduced-tail-swing machines, that alone saves you days of head-scratching.

Dr.ZX Diagnostic System – Factory Fault Code List

Built-in diagnostics are only useful when you have the fault code list. This manual includes the full Dr.ZX fault code list for the MC (machine controller) and a separate list for the Auto-MarcCino controller used on the 135UR. It also contains Dr.ZX monitoring item lists, special function guides, and service mode instructions. You get the adjustment data list and sensor operational range table – critical when you’re trying to figure out why the Dr.ZX monitor is reading 50 kPa off on the pump pressure.

Troubleshooting A and B – Systematic Fault Isolation

Troubleshooting A walks you through fault codes 01 through 19 with dedicated pages for each code. Troubleshooting B is a broader system approach: engine system, all actuator system, front attachment system, swing system, travel system, blade system (135UR only), and other systems. There’s a correlation table between trouble symptoms and part failures. If your 110M has a slow boom raise and weak arm curl, you flip to the front attachment troubleshooting section and check the overload relief valve settings. The manual gives you the step sequence, not a flowchart that ends in “replace the whole pump.”

Does This Manual Include Engine and Hydraulic Specs?

Yes. Section 4 covers engine tests (speed, compression, nozzle check, injection timing) and lubricant consumption. The hydraulic component tests cover main pump delivery pressure, main relief valve set pressure, swing relief pressure, travel relief pressure, overload relief valve set pressure, and main pump flow rate measurement. You also get swing motor drainage and travel motor drainage procedures. All specs are listed in the standard tables per model. The manual gives you the pass/fail criteria, not just a vague range. If your 125US track motor is leaking past spec, you’ll know exactly where the limit is before you order seals.

Source Authenticity – Why OEM Files Beat Aftermarket

This PDF is a direct scan of the Hitachi technical manual TT187-E-04. The OCR excerpt on the intro page says it all: “This manual is written for an experienced technician to provide technical information needed to maintain and repair this machine.” No third-party rewriting. No condensed edition. The page numbering follows the original Hitachi layout – T1-3-5 style. If you’ve ever tried to follow an aftermarket manual that says “torque to spec” without giving the actual value, you know the difference. This one gives you the main relief valve set pressure for the 135US in black and white. You can verify against the machine’s actual plate.

Frequently Asked Questions

Does this manual cover the ZAXIS 130LCN?

Yes. The 130 and 130LCN are listed in the operational performance standard tables and included throughout the manual.

Is this the same manual Hitachi dealers use?

It is the Technical Manual (Troubleshooting) volume – TT187E – part of the three-volume set (Operational Principle, Troubleshooting, Workshop). Dealers get all three, but this is the troubleshooting volume that covers performance tests, fault codes, and systematic diagnostics. If you need removal/installation procedures, you want the Workshop Manual. The related Fiat-hitachi 110, 125US, 110M, 135US, 120 Workshop Manual – OEM Factory Specs is available separately. For larger models, also check the Fiat-hitachi ZX800 Technical Manual – OEM Factory Specs and the Fiat-Hitachi 40U-2 50U-2 Technical Manual – 349 Pages OEM.

What kind of maintenance schedule is in here?

This manual is troubleshooting-focused, not a maintenance scheduler. It includes performance test procedures and adjustment specs, but for routine service intervals you need the Operator’s Manual or the Workshop Manual.

Can I use this for the 135UR?

Absolutely. The 135UR has its own dedicated sections for blade control, bucket/cab collision prevention, arm angle sensor adjustment, and initial setting of the depth limit control system. The Dr.ZX lists also include the Auto-MarcCino controller specifics for the 135UR.

If you’re tired of chasing specs through forum posts and copied PDFs, grab the factory file. For comparison, other resources like Manual Transmission and Manual Transmission don’t hold a candle to this level of detail – but those aren’t your problem when you’re staring at a non-starting ZAXIS 110 with a Dr.ZX code 07. Access the Factory Manual and get the actual data Hitachi engineered into the machine.