Description

Komatsu PC490LC-11 Installation Manual

If you are assembling a PC490LC-11 from a shipping state – track frames off, counterweight separate, work equipment in crates – you need the Komatsu PC490LC-11 Installation Manual on your bench, not some aftermarket knock-off that guesses at torque values. I have watched crews lose half a day because they used a generic bolt chart and snapped a mounting bolt. That’s time you do not get back. This manual is 134 pages of Komatsu’s own field assembly instructions, and it tells you exactly what to do in order.

That’s 134 pages of Komatsu’s own documentation, covering everything from chassis assembly to the final hydraulic flush. The manual came from Komatsu’s engineering group, not a third-party republisher. You get the OEM part numbers, the factory sequence, and the torque specs that match the bolts in your kit. No recompiled PDF.

Specifications: What the Manual Covers First

The first chapter after the foreword is Specifications. That is where you get the machine weight, overall dimensions, fluid capacities, and the serial number range (85001 and up). For a field assembly, you need those numbers before you pick the crane capacity or rigging. Page 1 lays out the basic machine data. The manual does not guess at which track gauge or counterweight config applies – it lists the production variants.

Tool List for Field Assembly – What You Bring

Page 10 of the manual lists the required tools. Not suggestions – required. Komatsu spells out the torque wrench range, the socket sizes, the puller and press tooling, and the special pins needed to align the boom foot. If you show up with a 3/4″ drive set and the manual calls for a 1″ drive on the track tension adjuster, you waste time. I have seen it happen. The tool list also specifies the nylon slings and wire ropes with rated capacities, keyed to the assembly step sequence later in the book.

Tightening Torque: The Table That Keeps Bolts in Place

Bolts get torqued once. You pull the bolt, apply thread locker where noted, and hit the spec from the Tightening Torque chapter (page 11). The table lists torque values in foot-pounds for each bolt grade and diameter used on the PC490LC-11. Counterweight bolts, boom foot pins, cylinder gland nuts – all there. Ignore that table and you either strip threads or leave a joint loose enough to work open under load. The manual also includes a mounting bolt torque check sheet at the back for sign-off after assembly.

A. Assembly of Chassis – Where You Start

Section A walks you through putting the chassis together: handrail installation, mirror mounting, tail pipe and tail pipe cover. Each step has a diagram and the fastener requirements. After that, Section B covers the work equipment – boom cylinder, boom assembly, arm, bucket. The manual includes a critical step at B-2: releasing remaining pressure in the hydraulic circuit before you break any lines. That is a safety step you skip at your own risk. Hydraulic oil at 5000 psi will injure you. The manual calls it out in bold.

M. Procedure for Inspection and Maintenance After Assembly

Once everything is bolted together, Section M (starting around page 120) gives the post-assembly checks: replacing the return filter with a flushing filter, flushing the hydraulic circuit, checking oil and coolant levels, and bleeding air from the work equipment circuit. There is also an error code table. If the machine throws a code after first start, the manual tells you what to look for. That section alone keeps a machine from going back to the shop for a simple sensor issue.

Sources: OEM Print – Not Aftermarket Copy

This file is a direct scan of the Komatsu original, not a retyped version from a third-party manual site. The OCR excerpt shows the original typography and layout. When you see a torque value on page 11, it matches the bolt in your hand because Komatsu’s engineers wrote it. Aftermarket manuals often copy the table but misalign the rows. Do not trust them. Stick with the factory document.

FAQ

Does this manual cover the complete PC490LC-11 model including serial numbers before 85001?

No. The manual explicitly states serial numbers 85001 and up. If your machine is earlier, this may not apply. Check the serial number plate before purchasing.

What torque specifications are included for the counterweight bolts?

The Tightening Torque chapter on page 11 lists values for M20, M24, and M30 bolts used on the counterweight. It also notes the required angle of turn for bolts with an applied preload. Always use the value matched to the bolt grade (10.9 or 12.9) printed next to the torque number. The manual also includes a mounting bolt torque check sheet at the end for documenting the final torque.

Related Manuals

• KOMATSU PC490LC-11 Shop Manual
• Komatsu PC490LC-11 2014 Workshop Manual
• Komatsu WD900-3 Installation Manual – Field Assembly Specs & OEM Torque
• Manual Transmission
• Manual Transmission

Get the factory data before you touch a wrench. Access the Factory Manual and keep it open on your tablet or print the torque table. Your machine will thank you.