Hydraulic pumps are the heart of heavy machinery. When they start to fail, the entire system is at risk of breaking down which leads to expensive downtime and lost productivity. Knowing the early signs of hydraulic pump failure can save thousands in repair costs and keep your equipment running smoothly.
In this guide, we’ll cover the most common hydraulic pump failure symptoms and what they mean, so you know when it’s time to call in the experts.
1. Unusual Noises (Grinding, Whining, or Knocking)
- What it means: Air in the system (aeration), cavitation, or worn components.
Why it matters: Left unchecked, these issues can cause internal scoring and permanent pump damage.
What to do: Stop running the equipment and arrange for inspection.
2. Visible Leaks or Oil Puddles
- What it means: Worn seals, cracked housing, or excessive pressure.
- Why it matters: Low oil levels reduce lubrication and cooling, accelerating failure.
- What to do: Don’t just top up fluid, leaks need immediate repair to prevent total pump breakdown.
3. Loss of Power or Pressure
- What it means: Internal wear, damaged pistons/gears, or fluid contamination.
- Why it matters: Your machine may still run, but efficiency and safety are compromised.
- What to do: If hydraulic functions feel weak, get the pump stripped down before operational failure occurs.
4. Overheating and Excessive Heat Buildup
- What it means: Low fluid levels, blocked filters, or overloading.
- Why it matters: Heat causes fluid breakdown and damages seals, multiplying repair costs.
- What to do: Check for restricted flow or dirty oil — and arrange a professional inspection.
5. Jerky or Erratic Movements
- What it means: Air in the hydraulic system or uneven pressure delivery.
- Why it matters: Erratic operation can lead to unsafe conditions and more serious damage.
- What to do: Bleeding and inspection may be needed to restore smooth operation.
Why Acting Quickly Matters
Around 80-90% of hydraulic failures start with the pump. Spotting these symptoms early and calling in specialists reduces the risk of total failure, expensive part replacements, and prolonged downtime.
How JSG Hydraulics Can Help
At JSG Hydraulics, we:
- Offer free collection across the UK & EU for faulty pumps.
- Provide a free strip-down and no-obligation quotation.
- Repair and test pumps to OEM specifications, with a 12 month warranty on every job.
If you’ve noticed any of the above signs of hydraulic pump failure, contact JSG today. Acting early could save you both time and money.
JSG Hydraulics 