Description

Volvo Construction Equipment EC140B LC, EC140B LCM Technical Manual

Volvo Construction Equipment EC140B LC, EC140B LCM Technical Manual – 24 pages covering the travel motor assembly in full. If you’re a mechanic who has chased a hydraulic leak because aftermarket diagrams skipped a check valve, you know the value of factory documentation. This manual is the OEM material from Volvo Construction Equipment, not a third-party reprint. It gives you the internal sectional views, the relief valve set pressures in psi, and the brake valve operation for three states: stop, travel, and overrun.

Travel Motor Specifications – What the OEM Numbers Mean

The manual opens with the Travel Motor Specification table for both the EC140B LC and the EC140B LCM. Displacement numbers are 84.4 / 47.1 cc/rev (5.15/2.87 cu-in/rev). Rated flow is 117 Lpm (30.9 gpm). Relief valve set pressure hits 360 kgf/cm² (5122 psi). If you’re rebuilding a travel motor and need the speed changeover pressure (255 ±15 kgf/cm²) or the parking brake release pressure (14 kgf/cm² / 200 psi), it’s right there in the spec table. No flipping through generic charts.

Brake Valve Operation – Stop, Travel, and Overrun

The brake valve section is split into three operations. First, Brake Valve Operation(Stop) shows how the valve holds the motor when hydraulic flow stops. Second, Brake Valve Operation(Travel) details the flow paths when the machine moves. Third, Brake Valve Operation(Overrun) covers what happens when the load overruns the motor. Each operation includes a schematic and a step-by-step explanation of spool movement. If you’ve ever had a machine creep on a slope because someone adjusted the wrong port, you’ll appreciate the factory logic.

Relief Valve Settings – Two Scenarios

There are two relief valve sections in the manual. Relief Valve Operation(1) and Relief Valve Operation(2) for the EC140B LC, then separate Relief Valve Operation(by external force) and Relief Valve Operation(by brake valve) for the EC140B LCM. The pressures are factory set at 5122 psi. If you need to test or adjust, the manual shows the exact internal paths. Don’t trust aftermarket specs; they often round numbers. OEM data doesn’t round.

For related hydraulic system documentation, see the Volvo EC140B Main Control Valve Diagrams manual. For the engine side, the Volvo EC55B Engine Specifications and External View manual has the specs.

3 Speed Changeover Valve Operations – Low, High, and Automatic Downshift

The speed changeover valve is covered in three states: Low speed, High speed, and Automatic downshift. The manual explains how pilot pressure switches the motor from high-displacement low speed to low-displacement high speed. The automatic downshift section describes the logic when load increases. This is critical if you’re diagnosing a machine that won’t shift or hunts between modes. The manual gives you the failure modes directly from Volvo Construction Equipment engineering.

Parking Brake Operation – Don’t Skip This

Parking Brake Operation is a single page but it’s essential. The brake is spring-applied, hydraulically released. If the release pressure drops below 200 psi (14 kgf/cm²), the brake engages. If you’re bleeding the system and the brake won’t release, this manual tells you the sequence. I’ve seen techs waste half a day because they didn’t have the factory release pressure spec.

Why OEM Documentation Over Aftermarket

Aftermarket manuals often skip the internal sectional views and the exact valve operation sequences. This 24-page Volvo Construction Equipment Technical Manual is a direct scan of the factory document. Every page has the Volvo logo and part number. If you’re used to working on Manual Transmission systems, the hydraulic travel motor is a different animal, but the precision of OEM specs applies the same. Don’t let a third-party book cost you a seal failure. The travel motor is not a Manual Transmission; it’s a hydraulic piston motor with a swash plate.

Need the full travel motor external view with port identification? The manual shows Pm1, Pm2, Ps, P1, P2, T1, T2 – all labeled. If you’re looking for the engine side of the machine, check the Volvo Construction Equipment EC55B Technical Manual – OEM Hydraulic Cylinder Spe manual for cylinder specs.

FAQ: Common Questions About This Manual

Does this manual cover the entire excavator?

No. It covers only the travel motor section (chapter 14) for the EC140B LC and EC140B LCM. For engine or hydraulics, you need the full shop manual.

Are the torque specs included?

The manual lists relief valve set pressures and speed changeover pressures, but not fastener torques. Torque specs are in the main manual.

Is this a reprint?

It is a direct scan of the OEM document from Volvo Construction Equipment. Not a third-party reprint.

How many pages?

24 pages covering the travel motor specification table with displacement, flow, and pressure data, plus external and sectional views. It details brake valve operations for stop, travel, and overrun; relief valve operations for two different scenarios; speed changeover valve operations for low, high, and automatic downshift; and parking brake operation. All data is OEM from Volvo Construction Equipment, in imperial units (psi, gpm, cu-in). Aftermarket manuals often lack the exact valve operation sequence diagrams that this manual provides. If you are rebuilding a travel motor for the EC140B LC or EC140B LCM, you need these factory hydraulic schematics to understand the internal spool positions and port pressures. Without them, you are guessing at the brake release pressure and relief valve settings.

If you work on Volvo excavators, you need the factory numbers. Aftermarket data gets you close, but close leaks. This 24-page technical manual gives you the exact OEM specs for the travel motor. Access the Factory Manual now.