Description

Hitachi Sumitomo 170W-3, 190W-3 Training Manual

When you are wrenching on a 170W-3 or 190W-3 wheeled excavator, the last thing you need is a generic hydraulic diagram from some aftermarket CD. Every system on these machines – from the CAN network that ties the ECM to the main controller, to the Hitachi Sumitomo 170W-3, 190W-3 Training Manual – is an integrated mess of electronics and hydraulics if you don’t have the factory breakdown. This 483-page manual was written for Hitachi Sumitomo technicians, not for weekend guessers. If you own one of these wheel loaders, you need to understand how the controller talks to the transmission changeover solenoid valve before you go swapping parts.

System Architecture: What the 483 Pages Cover

Section T01_General kicks off with component layouts – both upperstructure and undercarriage. Page 2 shows you where the Brake Valve sits relative to the accumulator charging valve and the travel shockless valve. Page 3 maps the pump device, swing device, and the 3-spool solenoid valve unit. These aren’t cartoons; they are OEM position drawings that match what you’ll see under the hood. The manual then dives into T02_System, which breaks down the controller area network (CAN), the Engine control module (ECM), the main controller (MC), and the information controller (ICF). You get the full signal path – from the steering column monitor to the pump control pressure sensor.

If you have ever chased a no-start on a 190W-3, you know the security lock circuit can lock you out. The manual walks through every circuit in the Electrical system: starting circuit, charging circuit, serge voltage prevention circuit, and engine stop circuit. No aftermarket wiring diagram includes the pilot shut-off solenoid valve location like this does.

Hydraulic and Mechanical Systems – Real Component Operation

T03_Component Operation is where you spend your time. Each group explains the Valve stack, pump device, swing device, control valve, pilot valve, electric lever, Transmission, axle, travel motor, signal control valve, steering valve, brake valve, and all the “others” like the hose rupture valve and accumulator. The manual treats the hydraulic system as four separate circuits: pilot, service brake, steering, and main. You get the flow path through the main relief valve, overload relief valve, anti-drift valve, regenerative valve, and bypass shut-out valve. Want to understand how the bucket flow rate control valve interacts with the swing parking brake release spool? It’s in group 9.

Every torque value and adjustment procedure is listed per the OEM spec. If you skip the step where you check the accumulator charging valve pre-charge, you will chase brake drag all day.

Is This Manual for a DIYer Who Maintains Their Own Machine?

Yes, if you can read a hydraulic schematic. This is not a “remove and replace” parts manual – it is a training manual that explains why the transmission disconnect device engages and how the shift interlock control prevents gear clash. The language is direct, and every procedure is preceded by safety warnings and required tool lists. If you are a farm owner who does your own oil changes but have never touched a pump regulator, start by reading Group 1 in T02_System. The manual assumes you know basic diesel engine theory but does not assume you know Hitachi’s specific CAN message structure.

OEM vs. Aftermarket: Why This Training Manual Matters

I have seen too many aftermarket “service manuals” for the 170W-3 that copy the table of contents but leave out the ECM flowchart for fuel injection amount correction control. This PDF is the actual Hitachi Sumitomo training document used in their technical training center. The part number on the cover is TTLA-0721-ZX. The 483 pages match the factory binder. If you rely on a third-party reprint, you risk getting the wrong solenoid valve unit for your electric lever circuit – and that will burn billable hours.

Compare this to the HITACHI 170W-3 190W-3 ZAXIS Technical Training Manual which is the same file. If you also need the troubleshooting section, grab the Hitachi ZAXIS 170W-3 190W-3 2007 Technical Manual – Section: Section 5 Troublesh. And if you want the operator’s handbook for daily reference, see Hitachi Sumitomo 170W-3 190W-3 140W-3 210W-3 Operators Manual 2007.

For background on how manual transmissions work in heavy equipment, check the Manual Transmission explanation on Wikipedia. The principles in a Manual Transmission also apply to the travel motor disconnect device here.

FAQ

Does this manual include wiring diagrams?

Yes. The Electrical System section (Group 5 in T02_System) covers every circuit: main, accessory, starting, charging, serge voltage prevention, pilot shut-off, security lock, engine stop, security horn, wiper/washer, and light. Each circuit has a schematic with wire colors and connector pin locations.

Can I use this to rebuild the swing motor?

Yes. Group 2 of T03_Component Operation details the swing reduction gear, swing motor, swing parking brake, valve unit, and combination valve. It does not include step-by-step disassembly photos, but it explains the pressure points and bleed procedures.

If you are tired of chasing electrical ghosts on a 170W-3 or paying someone else to guess what the ECM wants, get the factory document that Hitachi Sumitomo wrote for their own techs. Access the Factory Manual and keep it on the tablet next to your torque wrench.