Why Is My Volvo Excavator Losing Hydraulic Power? (Troubleshooting & Fixes)

Why Is My Volvo Excavator Losing Hydraulic Power? (Troubleshooting & Fixes)

A Volvo excavator that suddenly loses hydraulic power can cause serious delays in construction, demolition, and material handling operations. Whether you operate a Volvo EC140, EC160, EC220, EC250, EC480, or any other model, hydraulic issues can arise due to low fluid levels, failing hydraulic pumps, clogged filters, worn-out control valves, or internal leaks.

This comprehensive troubleshooting guide will help you identify why your Volvo excavator is losing hydraulic power, how to fix the issue, and where to find detailed service manuals for long-term maintenance and repairs.

Q: Why Is My Volvo Excavator Losing Hydraulic Power?

1. Low or Contaminated Hydraulic Fluid

Problem:

The hydraulic system requires proper fluid levels and clean oil to function efficiently. If the hydraulic fluid is low, dirty, or aerated, pressure loss will occur, making the excavator slow or unresponsive.

Diagnosis:

✔ Check the hydraulic fluid reservoir for proper levels.

✔ Inspect for leaks around hoses, fittings, and cylinders.

✔ If the fluid appears foamy, dark, or contains metal particles, it may be contaminated.

Solution:

• Refill the hydraulic reservoir with Volvo-approved hydraulic oil.
• Inspect and repair leaks in the hydraulic system.
• Flush and replace hydraulic fluid if it’s contaminated or degraded.

Find hydraulic fluid maintenance procedures in the Volvo Excavator Service Manuals.

2. Clogged or Failing Hydraulic Filters

Problem:

A clogged hydraulic filter can restrict oil flow, causing weak or unresponsive hydraulics.

Diagnosis:

✔ If the boom, arm, or bucket moves slowly or jerks, check the hydraulic filters.

✔ Inspect the return filter and suction strainer for blockages.

Solution:

• Replace hydraulic filters if they are dirty or clogged.
• Clean or replace the suction strainer in the hydraulic reservoir.

Find filter replacement procedures in the Volvo Equipment Manuals.

3. Worn or Failing Hydraulic Pump

Problem:

The hydraulic pump generates pressure to move the excavator’s attachments. If the pump is worn, leaking, or failing, the machine will lose hydraulic power.

Diagnosis:

✔ If the excavator struggles to lift loads or moves sluggishly, check the hydraulic pump.

✔ Listen for whining or grinding noises from the pump.

✔ Test the hydraulic pressure output using a pressure gauge.

Solution:

• Test the hydraulic pump pressure and compare it with manufacturer specifications.
• Replace a weak or failing hydraulic pump if necessary.

Find hydraulic pump troubleshooting guides in the Volvo Excavator Manuals.

4. Faulty Hydraulic Control Valve

Problem:

The hydraulic control valve directs oil to different excavator components. If it is stuck, leaking, or clogged, power loss will occur.

Diagnosis:

✔ If the excavator moves slowly or doesn’t respond, check the control valve.

✔ Inspect for internal leaks, blockages, or stuck spools in the valve.

Solution:

• Clean or replace the hydraulic control valve to restore flow.
• Check for damaged solenoids and replace them if needed.

Find control valve maintenance and repair steps in the Volvo Equipment Manuals.

5. Air in the Hydraulic System

Problem:

If air gets trapped in the hydraulic system, it can cause spongy or weak hydraulics.

Diagnosis:

✔ If the hydraulics feel sluggish or unresponsive, check for air pockets.

✔ Look for bubbles in the hydraulic fluid when inspecting the reservoir.

Solution:

• Bleed the hydraulic system to remove trapped air.
• Ensure all hydraulic connections are tight to prevent air leaks.

Find air bleeding procedures in the Volvo Excavator Service Manuals.

6. Internal Hydraulic Leaks in Cylinders

Problem:

Worn-out seals in the boom, arm, or bucket cylinders can cause internal leakage, reducing hydraulic power.

Diagnosis:

✔ If the attachments drift down or lose holding power, check for internal leaks.

✔ Extend the cylinders and listen for fluid bypassing inside the cylinder.

Solution:

• Replace worn-out cylinder seals to restore full pressure.
• Inspect hydraulic hoses for pinhole leaks and replace them if necessary.

Find cylinder seal replacement procedures in the Volvo Equipment Manuals.

7. Electronic Sensor or ECM Failure

Problem:

If the excavator has electronic controls, a faulty ECM (Engine Control Module), hydraulic pressure sensor, or joystick sensor can limit hydraulic power.

Diagnosis:

✔ If error codes appear on the display, check for ECM faults.

✔ Test the hydraulic pressure sensor and joystick controls.

Solution:

• Reset or update the ECM software if error codes appear.
• Replace a faulty hydraulic pressure sensor to restore full control.
• Inspect wiring and connectors for corrosion or damage.

Find electronic system troubleshooting procedures in the Volvo Excavator Manuals.

How to Prevent Hydraulic Power Loss in Your Volvo Excavator

• Check and refill hydraulic fluid regularly to maintain pressure.
• Replace hydraulic filters at the recommended service intervals to avoid blockages.
• Inspect hydraulic pumps and control valves for leaks or wear.
• Monitor hydraulic cylinder performance and replace worn seals.
• Follow Volvo’s maintenance schedule using a detailed repair manual.

Get the Best Volvo Excavator Repair Manuals at ManualsKart

If your Volvo excavator is losing hydraulic power, a detailed service manual can help you diagnose and fix the issue quickly. At ManualsKart, we provide instant digital downloads of Volvo repair manuals, covering hydraulic troubleshooting, pump diagnostics, control valve adjustments, and more.

Find your Volvo excavator repair manual here:

• Volvo Equipment Manuals

We also offer manuals for other heavy equipment brands, including:

• Case Construction Manuals
• Komatsu Equipment Manuals
• Caterpillar Equipment Manuals
• New Holland Ag Equipment Manuals
• Hyundai Equipment Manuals

Visit ManualsKart today and download a Volvo excavator repair manual to restore full hydraulic power.