Description

Volvo Parts L110E, L120E Electrical Schematic

Troubleshooting an electrical fault on a Volvo L110E or L120E loader without a factory wiring diagram is a waste of billable hours. I’ve seen guys chase a no-start condition for half a day because they were using a generic schematic that didn’t match the actual pinouts. Volvo Parts L110E, L120E Electrical Schematic is the 55-page OEM document you need on your bench. It includes every circuit from the main power feed to the reversible fan controller. No guessing—just the actual Volvo-issued lines.

55 pages. That’s it.

Sch01 to Sch34: What This 55-Page Manual Covers

The document breaks the electrical system into 34 separate schematics (Sch01 through Sch34). Each one isolates a specific subsystem. For example, Sch03 covers the starting motor and preheating circuit—critical for cold-weather startups in San Antonio? Not often, but for northern shops it’s gold. Sch05 handles engine cooling and oil level. Sch06 and Sch07 are the lighting and working lights, with separate versions for the L110E and L120E. You get both. Sch13 covers brake cooling oil temperature and transmission oil level—a common culprit for transmission overheating complaints. Sch21 and Sch22 detail work hydraulics, including the 4th function and detent circuits. Page 1 lists all the main diagram numbers so you know exactly which schematic to pull up.

Each diagram is labeled with its Volvo part number.

Is Your Model L110E or L120E Covered?

Yes, both. The manual includes distinct schematics for each model where they differ. Look at Sch06—L110E gets diagram 1005459, L120E gets L69064A. Same for Sch07, Sch08, Sch11, Sch12, and several others. The main diagram for L110E is 1005456; for L120E it’s L69050A. So if you’re working on either machine, the correct wiring paths are right there. No need to cross-reference two separate books. Page 2 shows the main menu layout that lets you jump to any schematic instantly in the PDF.

Work Hydraulics: Diagnose Solenoid Failures with Sch21

A customer brings in a L120E with a dead work hydraulic function. You suspect a solenoid or a wiring break. Instead of probing blindly, open Sch21. It shows the work hydraulics circuit with the 4th hydraulic function option. Sch22 covers the detent and 3rd hydraulic function. The schematic tells you exactly which wire feeds which solenoid valve. Follow the line from the ECU to the valve—you’ll see the connector pin numbers. That’s hours of diagnostic time saved. For background on diesel engine electrical fundamentals, see this Wikipedia article on diesel engines.

OEM Factory Print vs Aftermarket Reprints

Aftermarket wiring diagrams get sold to shops a lot. They claim to be ‘factory equivalent.’ In my experience, they miss details like diode orientations, ground locations, and paint color codes. This schematic is a direct Volvo Parts document—same PDF the dealer would pull up. You get the actual Volvo Construction Equipment logos, the part number for the document (84624016991), and the internal page numbers. If a wire color is listed as ‘SB’ (blue), that’s the Volvo standard. Aftermarket books sometimes use different color abbreviations. Don’t trust your time to a copy. this Wikipedia article on diesel engines explains how electrical systems evolved, but for Volvo loaders you need the factory print.

3 Systems Where This Schematic Prevents Part Swapping

First: starting motor and preheating (Sch03). A failed preheat relay looks like a starter issue—but the schematic shows the interlock. Second: gear shifting solenoids and transmission disengagement (Sch11). If the machine won’t move, don’t replace the transmission control unit until you’ve checked the solenoid wiring per the diagram. Third: brake cooling oil temperature sensor circuit (Sch13). A bad sensor or a rubbed wire triggers a false overheat lamp. The schematic shows the exact sensor pinout. Swap parts after you confirm the circuit. If you need engine data, check the Volvo D11B Engine Specifications Manual.

FAQ – Electrical Schematic Questions

Does this schematic include torque specs or repair procedures?

No. This is an electrical schematic only—55 pages of wiring diagrams.

What format is the file? Can I print it?

It’s a PDF. You can print individual schematics at full size. I’d recommend printing Sch03 (starting motor, preheating), Sch06 (lighting), and Sch21 (work hydraulics) if you work on loaders regularly. Lamination helps when you’re under the machine with greasy hands. The PDF is searchable by diagram number, but the schematics are vector-based, so zooming in keeps them sharp and readable even at 400%. You can also load it onto a tablet with a PDF reader for quick reference on the shop floor.

Which models are covered? Only L110E and L120E?

Correct. This manual covers Volvo L110E and L120E wheel loaders only. Not the L90E or L150E. If you need other models, check our Volvo D11C Engine Specifications and Technical Data or Volvo D13C Engine Specifications Technical Manual 2011 for engine-specific diagrams.

Do I need any special software to view the schematic?

Any standard PDF viewer works. Adobe Acrobat or a browser plugin. No proprietary software.

If you’re tired of flipping through blurry photocopies or chasing phantom shorts with a test light and a prayer, put this factory schematic on your bench. It’s the same document Volvo technicians use. Access the Factory Manual now and get the correct circuit paths for your L110E or L120E.