Why is My Volvo Excavator Losing Power Under Load?

Why is My Volvo Excavator Losing Power Under Load?

Understanding Power Loss in Volvo Excavators

If your Volvo excavator is struggling under load, losing digging force, or slowing down when operating attachments, the issue could be related to fuel system problems, hydraulic inefficiencies, air intake restrictions, or engine wear. Below, we’ll explore the most common reasons why a Volvo excavator loses power and how to fix it.

Common Causes of Power Loss in Volvo Excavators

1. Clogged Fuel Filters or Weak Fuel Pump

A restricted fuel supply can cause the engine to starve under load, leading to a noticeable drop in power.

Solution:

• Replace the fuel filter as per the maintenance schedule in your Volvo excavator service manual.
• Inspect the fuel pump for weak pressure or malfunction.
• Check fuel lines for air leaks or blockages.

2. Dirty or Blocked Air Filter

An obstructed air filter reduces oxygen supply to the engine, leading to inefficient combustion and loss of power.

Solution:

• Inspect and replace the air filter if it’s dirty or clogged.
• Clean out the air intake system and ensure proper airflow.
• Follow air filter replacement procedures in your Volvo repair manual.

3. Turbocharger or Intercooler Malfunction

If your Volvo excavator has a turbocharger, a failing turbo or a clogged intercooler can reduce boost pressure, resulting in power loss.

Solution:

• Check for oil leaks around the turbocharger.
• Inspect intercooler hoses for cracks or loose connections.
• Test turbo boost pressure using the specifications in your Volvo excavator service guide.

4. Worn or Clogged Fuel Injectors

Fuel injectors control the amount of diesel entering the engine. Clogged or malfunctioning injectors can cause incomplete combustion, leading to reduced power.

Solution:

• Perform a fuel injector test to check for blockages or wear.
• If injectors are clogged, clean them using a diesel injector cleaner or replace them.
• Follow injector testing steps in your Volvo excavator repair manual.

5. Low Hydraulic Pressure or Pump Failure

If the excavator’s hydraulics are weak, it may struggle to operate attachments or lift heavy loads.

Solution:

• Check hydraulic fluid levels and refill if necessary.
• Replace clogged hydraulic filters and inspect for leaks.
• Test hydraulic pump pressure and replace the pump if it’s worn, using guidance from your Volvo hydraulic system manual.

6. Engine Overheating or Exhaust Restrictions

An overheating engine can go into a protective mode, reducing power output. A clogged exhaust system can also prevent proper engine performance.

Solution:

• Check for coolant leaks and clean the radiator.
• Inspect the exhaust system for blockages, especially the diesel particulate filter (DPF) in newer models.
• Follow cooling system maintenance steps in your Volvo equipment repair guide.

Preventive Maintenance for Volvo Excavators

To prevent power loss in the future:

• Replace fuel and air filters regularly.
• Monitor turbo and fuel injectors for wear.
• Maintain the hydraulic system for optimal pressure and efficiency.
• Follow scheduled maintenance in your Volvo service manual.

Get the Right Manual for Your Volvo Excavator

A Volvo excavator service manual is essential for diagnosing and fixing power loss, fuel system failures, hydraulic issues, and engine malfunctions. At PDFManualsShop.com, we provide Volvo repair manuals with step-by-step troubleshooting guides, wiring diagrams, and maintenance instructions.

We also offer manuals for Case, John Deere, Kubota, and Bobcat.