Description

Hitachi Sumitomo SH330, SH330LC, 350HD-3B 2006 Workshop Manual

You’ve got a **Hitachi Sumitomo** excavator on your lift – an SH330, SH330LC, or a 350HD-3B. Maybe the swing unit is leaking, the track tension is off, or the hydraulic pump control curve doesn’t match what the dash is telling you. You pull out a generic third-party manual and the torque values don’t line up with the bolts you’re staring at. I’ve been there. That’s wasted time and a safety hazard. This 2006 Workshop Manual is the factory original – 382 pages of the actual specs Hitachi Sumitomo printed for their technicians. No guesswork, no aftermarket approximations.

Tightening Torque for Major Parts

Page 64 lists the exact torque specs for the lower mechanism and upper mechanism fasteners. The manual dedicates a full section – “Tightening Torque for Major Parts” – to those values. You get the numbers for track shoe bolts, travel unit flange nuts, swing unit mounting hardware. I’ve seen stripped threads and cracked flanges because someone used a generic chart. This manual gives you the correct ft-lb for each fastener, grouped by location. Use a calibrated torque wrench. Skip that step and you’re welding a new bracket next week.

Engine and Related Areas: What the Manual Covers

The engine section (page 86) walks through the disassembly of the power unit, but it’s not a full engine rebuild guide. It covers removing the engine from the upper mechanism, dealing with the mounting brackets, and reconnecting the hydraulic pump. Page 32 shows the equipment configuration for the engine and related areas – cooling system routing, alternator brackets, and the exhaust path. If you need in-depth fuel system tuning, you’ll want to pair this with the Hitachi Sumitomo SCX1200-2 SCX1500-2 Workshop Manual – Section: Fuel And Engine, which covers injection pump calibration. This manual gives you the factory procedure for R&R so you don’t snap a bellhousing bolt.

Does This Manual Cover the Fuel System?

Yes, but in a targeted way. The “Fuel / Lubricants and Filters” section (page 43) specifies the approved fuel grade, oil viscosity for the hydraulic system, and filter part numbers. It also includes the fuel tank removal procedure. What it doesn’t do is provide injector timing specs or pump bench test data – that’s outside the scope of a workshop manual. For that, refer to the engine manufacturer’s service data. The manual is an excavator-level repair guide, not a power unit overhaul book.

3 Reasons to Trust Factory Specs Over Aftermarket

First, the torque tables are verified against production tooling. Aftermarket manuals often round values or mix metric and imperial incorrectly. Second, the wiring diagrams (in the Controls section) are drawn from the actual harness layout – no color-code guesses. Third, the safety warnings are from the original safety committee, not a copywriter. Page 1 outlines the safety precautions for using technical information. That page alone is worth the access if you’re unfamiliar with high-pressure hydraulic systems.

Disassembling and Maintenance Instructions for Major Components

This is the meat of the manual. The lower mechanism breakdown covers the track shoe, travel unit, recoil spring assembly, and the rotating joint. Each component has a disassembly, inspection, and reassembly sequence with torque callouts. For example, the upper roller assembly (page 78) includes the tightening torque for the roller shaft nut and the end cap bolts. The manual uses step numbers and references assembly drawings – no vague phrases. If you are trying to rebuild the swing unit motor, the section “Swing Unit Motor Maintenance” tells you the shim thickness for adjusting backlash. That kind of spec only comes from the OEM.

One thing I want to stress: the “Fuel” section (page 43) lists the approved diesel fuel specification and the lubricant capacities for the hydraulic tank, swing gear case, and travel gear case. Don’t guess the oil volume. Overfilling the hydraulic tank can cause aeration and pump cavitation. The manual states the exact gallons or liters – use it.

How This Manual Fits Your Workflow

If you’re a shop owner in San Antonio or a home mechanic with a used 350HD-3B, this manual saves you phone calls to the dealer. You get the lifting capacity charts (page 52) for safe rigging, the hydraulic pump control curve (page 62) for pressure troubleshooting, and the maintenance standards value table for wear limits (page numbers in the Major Parts section). The manual is a PDF, so you can print the page you need for the job and throw it in a binder. Keep it near the machine, not in a filing cabinet.

Need to compare this manual with a smaller Hitachi Zaxis? Check out the Hitachi Sumitomo SCX1200-2 SCX1500-2 Workshop Manual for larger crane-excavator hybrids, or the Hitachi Zaxis XZ70 Workshop Manual Introduction for a compact excavator. For general mechanical principles – like understanding how a Manual Transmission works to help with the travel unit’s reduction gears – Wikipedia has reliable background. Another resource on Manual Transmission design can clarify gear ratios if you’re rebuilding the travel motor assembly.

What torque values are listed for the track shoe bolts?

Page 68 in the Track Shoe section gives the tightening torque. It’s in ft-lb and Nm. Use the chart on page 22 for conversion if needed.

Does this manual cover the fuel injection pump?

No. It covers fuel tank removal, filter replacement, and fuel grade specs. Injection pump work requires the engine’s separate service manual.

How many pages does this manual have?

382 pages of factory procedures, specifications, and drawings.

What models are included?

SH330, SH330LC, and 350HD-3B. Serial number ranges are not in the scanned TOC, but the manual was first edition 09/2006 for these three models. If you have a 350HD-3B with a different year, some specs may vary.

You’re not going to find a clearer, more trustworthy document for this machine. Every torque value, every hose routing, every disassembly step is the same one Hitachi Sumitomo engineers wrote. Access the Factory Manual and put it on your tablet or print the pages you need. Your machine – and your back – will thank you.