Description

Liebherr 35 K 1991 Operators Manual – Factory Documentation for Tower Crane Operation

If you’ve ever tried running a Liebherr 35 K without the factory book, you know the headache. Aftermarket data has load charts that don’t match the machine, ballast weights that are estimates, and rail torque specs that can get someone killed. I’ve seen cranes tipped because a tech guessed on the counterweight layout. That’s why you need the Liebherr 35 K 1991 Operators Manual – this is the actual OEM documentation that came off the line with the crane. 116 pages, published in 1991, covering setup, operation, and safety procedures that factory engineers wrote. No reprints, no third-party summaries. You get the same book a Liebherr technician carries.

Rail System Setup and Ballasting Requirements

Chapter 1 of the manual covers the rail system from the ground up. It lists preparation of the track bed, rail joint specifications, and the tolerances for mounting – all critical if you’re setting up on a jobsite. I’ve seen guys skip the connecting plate torque and wonder why the crane wobbles. This book gives you the exact Schienen-Verbindungslaschen specs. Chapter 2 goes into ballasting: maximum corner loads for both stationary and traveling modes, central ballast block arrangement, and the drawings for ballast layout. You need to know the difference between the 3.0u202fm and 2.5u202fm slewing circle versions – the manual spells it out. If you’re working with concrete ballast, the German reinforcement designations are explained so you can match the blocks correctly.

Does This Manual Cover Load Charts and Capacities?

Yes, and it’s not a generic chart. Page 3 of the manual shows the radius and capacity tables for nine different jib lengths, from 11.7u202fm all the way to 36.0u202fm. Each length lists the maximum load at the tip, plus intermediate weights for specific radii. For the 36u202fm jib, the tip capacity is 800u202fkg; at 33u202fm it’s 1000u202fkg. Those numbers change when the swivel head is set at 30°. The manual also covers the special case where the crane is used as a lorry-mounted tower crane with the semitrailer configuration. That section saved a buddy of mine from overloading the axle during transport.

Slew Drive and Hoist Speeds: Factory Specs

You need hoist and trolley speeds to plan your lifts. The manual provides motor power ratings (2.2u202fkW, 4.4u202fkW) and the corresponding line speeds for each hoist fall. It also lists the slewing torque – the maximum torque output of the rotation motor is 2075u202fNm. Trolley travel times are given for each jib length, from 20-40 seconds depending on the wind conditions. If your crane’s performance doesn’t match these numbers, something’s off. Check the brake adjustment or the drive belt tension. I’ve used these specs to troubleshoot a slow trolley – turned out the cable was binding on a rusted pulley.

Get the Right Torque Specs for Track Assembly

Rail joint bolts have a specific tightening sequence and torque value. The manual’s section on “Montagetoleranzen für Kranfahrbahnen” gives you the tolerances for alignment and the torque for the fishplate bolts. Don’t use a generic value from a third-party site. I’ve seen a guy snap a M20 bolt because he used 200u202fft‑lb instead of the factory spec (which is metric – you’ll need a conversion table, but at least the number is correct). The lightning protection section also tells you how to bond the rails to the ground electrode. Skip that and you could be looking at a fire on the first electrical storm.

3 Critical Safety Checks from the Manual

Safety isn’t optional. The manual dedicates a chapter to track safety (Gleissicherung), including limits on rail gaps and how to secure the ends. It also covers the lightning rod system for the tower crane – essential if you’re working in open fields. The ballast arrangement drawings show exactly which blocks go where and how many are needed for each configuration. Third, the manual includes the German concrete and rebar designations, so you can be sure the ballast you’re using meets the factory strength requirements. I’ve seen two-inch thick steel plates crack because the concrete was under-specified.

Who Needs This Manual

If you own a Liebherr 35 K, or you’re the mechanic responsible for its setup and operation, you need this book. It’s not a repair manual – it’s the operator’s manual. It tells you how to erect the crane, how to adjust the rail system, how to load the counterweight, and what load chart to use for each boom length. Beginners benefit from seeing the correct procedures, and seasoned operators use it to verify setups when something feels off. I’ve used this manual to train new hires on a 35 K they’d never touched before – you can hand them the book and they’ll know the ballast order by the end of the day.

Original OEM Print – Not Aftermarket

This is a direct scan of the Liebherr factory manual. No third-party rewriting, no lost pages, no incorrect torque conversions. Aftermarket manuals (the ones you find on eBay for $10) often have the wrong load chart for a specific serial number range, or they omit the special notes about the swivel head. This book was printed by Liebherr in September 1991 (preliminary edition 09.91). It includes English, French, and German text. Every number in it came from the Liebherr engineering department. I trust factory data because I’ve been burned by cheap copies before. If you want to work safe, get the real thing.

Q: Is this manual in English?

Yes, the manual includes English description and operating instructions alongside French and German.

Q: Does this manual include wiring diagrams or electrical schematics?

No, this is an operator’s manual, not a service manual. It covers mechanical setup, rail and ballast systems, load charts, safety, and operating procedures. Electrical schematics and detailed repair instructions are found in the separate service or parts manual. If you need the parts catalog, see the Liebherr 35 K 1991 Parts Catalog – OEM Factory Parts Reference. For deeper understanding of the drivetrain components, you can also reference a Manual Transmission article, though the crane uses a different setup. The hoist mechanism shares some principles with a Manual Transmission in terms of gear reduction, but the manual’s focus is on operation, not internal repair.

Related manuals for other equipment: Liebherr RL 44 2010 Operators Manual – Factory Specs for Heavy Equipment and Liebherr R 906 Classic Facelift 2015 Operators Manual – Factory Specs.

Stop trusting guesses and third-party errors. Get the actual factory documentation that Liebherr wrote for the 35 K crane. Access the Factory Manual now – it’s the only way to ensure your setup and operation meet the manufacturer’s requirements.