Description

Hirschmann DS 350GW 1996 Operators Manual – Load Moment Indicator Specs & Procedures

Your crane’s load moment indicator throws a code, and the rental fleet is waiting on you. Without the factory book you’re guessing—and guessing on a 50-ton lift can kill someone. I’ve been a master tech for 28 years, and I’ve seen what happens when guys skip the OEM procedure. The Hirschmann DS 350GW 1996 Operators Manual is the only document that gives you the exact sequence for setup, calibration, and troubleshooting. It’s 58 pages, no aftermarket nonsense, straight from PAT (Pietzsch Automatisierungstechnik).

System Description and the Operating Console

Section 3 breaks down the DS 350GW system from the ground up. Page 5 covers the Operating Console layout—where each button lives and what the display tells you. If you’ve ever stared at a blinking “LOAD” light with no idea what it means, this chapter fixes that. The manual explains the System Function (section 3.2) so you understand how the load cell and angle sensor talk to the control unit. No theory fluff—just the block diagram and signal flow you need for diagnostics.

Programming Procedure – Boom Angle Preset Limits

Section 4.3.2 walks through activating and setting boom angle preset limits. This is not a generic “enter a number” process; the manual gives you the key sequence to store limits in non-volatile memory. Page 26 details the Programming of Operating Mode step by step. Miss one press and the LMI defaults to a different configuration. I’ve seen guys wire in a toggle switch because they couldn’t find this—don’t be that guy.

Warnings Chapter – Why It’s Not Optional

Chapter 2 is three pages of warnings that most operators skip. That’s a mistake. The manual specifies that calibration must be verified after any sensor replacement or boom modification. It also warns against using the LMI as a primary overload protection device—it’s an indicator, not a safety interlock. These warnings come from the manufacturer’s liability research, not some third-party rewrite. Read them before you power the system on.

Pre-Operation Inspection and Calibration Verification

Chapter 5, starting on page 38, gives the daily inspection checklist. It includes visual checks of the load cell cable, angle sensor mounting, and display function. The calibration verification procedure uses test weights or a known load—you’ll find the acceptable deviation range printed right there. If the error exceeds 2% of rated capacity, the manual tells you to halt operation and recalibrate. That’s the kind of spec that keeps a crane from tipping.

Troubleshooting – When the LMI Throws an Error

Section 7 on page 45 lists common fault codes and their causes. For example, an “E2” error points to a bad angle sensor signal. The manual doesn’t just list codes—it gives you the test point voltages and the resistance values for each sensor. I’ve used this section to find a shorted cable in the boom harness that the aftermarket schematics didn’t even show. If you work on cranes, you need this data. Check the Manual Transmission section in the service records for related gearbox specs, but for LMI issues stick to this book.

Source Authenticity – OEM vs. Aftermarket Specs

This 1996 Operators Manual is a factory-printed document from PAT, the original manufacturer of the DS 350GW. Aftermarket reprints often omit the calibration constants and the exact keystrokes for boom presets. I’ve compared them side by side—the aftermarket version skips page 26’s programming sequence entirely. That sequence is critical if you change boom length or swap a sensor. If you value your time and your life, use the OEM source.

3 Reasons to Use Factory Documentation for Crane Systems

• Torque specs for sensor mounting bolts are in the manual’s appendices—not published online.
• The diagnostic flowcharts are written by the engineers who designed the hardware, not by a marketing team.
• Only the factory manual includes the PAT confidentiality notice and revision history, so you know exactly which software version the instructions match.

Does this manual cover all DS 350GW variants?

It covers the standard DS 350GW system as of the 5th edition (1996). Later variants with firmware updates may have different programming sequences; you’ll need the corresponding update bulletin.

Where are the pinout diagrams?

Page 41 in the calibration section has the connector pin assignments for the main harness. They are correct for the 1996 production run.

Can I use this manual for the DS 350G?

No. The DS 350G uses a different console layout and lacks the boom preset limits feature. Get the correct manual for that model.

How often should I recalibrate per this manual?

Annually, or after any repair involving the load cell or angle sensor.

Every crane operator or heavy-equipment tech should have this 58-page OEM reference on their workbench. It saves you from hunting through forum posts and aftermarket PDFs that leave out the critical steps. Access the Factory Manual now and get the exact procedures PAT intended for the DS 350GW. Also check out the related manuals: Hirschmann PRS 40 EZ 2010 Operators Manual – Factory Specs, Hirschmann iSCOUT expert compact 2007 Operators Manual – Factory Crane Specs, and Hirschmann PAT PRS 80 2005 Operators Manual – Factory Specs for Crane Load Indic. For general crane transmission knowledge, refer to Manual Transmission Wikipedia entry.