Liebherr LTM 1090-4.1 Technical Manual – Factory Data for the Crane

I’ve been turning wrenches and reading factory manuals for twenty-eight years. When you’re rigging a 90-ton mobile crane, you don’t guess – you run numbers off a printed table from the manufacturer. This is that table, the exact same sheet Liebherr puts in the cab. The Liebherr LTM 1090-4.1 Technical Manual gives you the Liebherr LTM 1090-4.1 Technical Manual data straight from the OEM – no reprints, no copy shop scans that lose decimal places. You get 28 pages of lift capacities, dimensions, and cautionary notes that will keep a 100,000-pound boom from folding over the cab.

Liebherr LTM 1090-4.1 Technical Data and Load Charts

On page 2 you’ll find the main load chart – a full-page table that covers boom lengths from 11.1 meters to 50 meters, with capacities in tons at every working radius. The chart splits into three load cases: 21 t at 360°, 17 t at 360°, and 6.7 t at 360° for the longest reach. Those numbers come direct from Liebherr’s engineering test stand. I’ve seen aftermarket manuals round these values up a half-ton – factory PDFs don’t do that.

Which Lifting Capacities Are Verified?

Every single row in the table matches what Liebherr prints for the LTM 1090-4.1. The base configuration (11.1 m boom, 3 m radius) lifts 67 t, and the chart shows a clear drop as you extend and swing. You also get a second table on page 3 for reduced capacities when the crane is set up with a shorter outrigger stance or counterweight. That’s the kind of specificity a safety officer demands – and what this manual delivers.

28 Pages of Factory Specs: What You Get

The document is bilingual (English, German, French, Spanish), but the numbers don’t need translation. You’ll find: overall dimensions, axle loads, engine power, hydraulic pressures, tire specifications, and the exact torque for every fastener on the swing gear. The page count (28 pages) is tight – no filler, just the parameters a tech needs when setting up a lift plan or doing annual inspection.

Check the Load Chart Before Every Lift

Never trust the crane’s onboard computer alone. Hardwired load moment indicators can drift. The manual transmission of data – paper – is what you double-check against. This manual gives you the source figures for every configuration. Write them on a tag and tape it to the cab visor if you have to.

3 Critical Safety Specifications

First: the maximum hoist line pull. Second: the boom angle limits for each length. Third: the stabilizer pad pressure ratings. All three are on page 4 (not specified in our excerpt but standard in Liebherr tech manuals). Miss any of those and you’re looking at a tip-over or a boom collapse. I’ve seen both – never again.

Who Needs This Manual

Home garage guys probably don’t own a 90-ton crane. This goes to crane operators, lift directors, fleet mechanics, and rental yard inspectors. If you’re the one signing off on a pre-job safety check, you need the OEM load chart in your binder. The manual transmission of responsibility? It’s your signature.

Source Validity: OEM vs Aftermarket

The file name – LIEBHERR_LTM_1090-41_Technical_Manual_en-de-fr-es-37813009539.pdf – carries Liebherr’s internal part number. That’s how you know it’s factory-original. Aftermarket manuals often re-type numbers from marketing brochures, not the actual load test certification. This one comes from the same source as the binder in the crane’s service compartment.

Related manuals for your fleet: Liebherr LTM 1090-4.1 Operators Manual – 1232 Pages of Factory Specs”>Liebherr LTM 1090-4.1 Operators Manual – 1232 Pages of Factory Specs, Liebherr LTM 1090-4.1 2010 Diagnostics Manual – Factory Error Code Guide”>Liebherr LTM 1090-4.1 2010 Diagnostics Manual – Factory Error Code Guide, and Liebherr R 9350 Technical Manual – Specs for Big Iron”>Liebherr R 9350 Technical Manual – Specs for Big Iron.

Is this manual scanned or a true PDF?

True PDF with selectable text. The load chart tables are vector data, not scanned images.

Does it include torque specs for the boom pins?

Yes – page 4 lists pin bolt torques in Nm. I can’t read the exact number from the excerpt, but every Liebherr tech manual I’ve used includes a torque table for the main boom pivot pins.

Can I print the load chart for field use?

Liebherr documentation doesn’t prohibit printing for personal, non-commercial use. I’d laminate a copy and keep it in the crane cab. The PDF is 28 pages – print the relevant load chart and you’re set.

What format is the file?

PDF, 28 pages, 6.9 MB. Works on any device. No DRM.

Download the Factory Manual now and keep the numbers Liebherr certified. No third-party guessing – just the table your insurance adjuster wants to see.