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Why Do PVG065 Variable Piston Pumps Keep Leaking Oil?

Oil leakage is a common issue in high-pressure hydraulic systems, especially in Vickers and Oilgear PVG065 variable displacement piston pumps.Many users assume the problem comes from the pump itself — but in most cases, the real cause is much simpler.

👉 The shaft oil seal is not suitable for high-pressure operating conditions.

Common Symptoms of Oil Leakage in PVG065 Pumps

If your PVG065 pump shows any of the following signs, sealing failure is likely the root cause:

  • Oil leakage at the shaft end

  • Frequent seal replacement with short service life

  • Oil contamination inside the hydraulic system

  • Increased maintenance downtime

These problems often appear even when the pump is still mechanically sound.

Why Standard Oil Seals Fail in PVG065 Applications

PVG065 variable piston pumps operate under demanding conditions:

  • High system pressure with pressure fluctuations

  • Elevated oil temperatures

  • Continuous shaft rotation

  • Long operating cycles

Standard hydraulic oil seals are usually designed for general applications.Under PVG065 working conditions, they may suffer from:

  • Lip extrusion caused by high pressure

  • Material hardening due to heat and oil aging

  • Loss of elasticity leading to micro leakage

Once leakage begins, it quickly escalates into a larger system issue.

The Importance of Material and Structure in High-Pressure Sealing

In high-pressure pump applications, two factors are critical:

1. Oil Seal Material

VITON (FKM) material offers superior resistance to:

  • High temperature

  • Hydraulic oil

  • Chemical aging

This makes it far more suitable than standard rubber materials for PVG065 pumps.

2. Oil Seal Structure

A reinforced structure, such as a TCV design, helps prevent seal lip deformation and extrusion under pressure, ensuring stable long-term sealing.

Recommended Oil Seal Solution for PVG065 Pumps

For users facing repeated leakage issues, the HPN-1301 / TCM-13203 VITON oil seal is a proven solution.

Size: 34.93 × 50.8 × 7.95

Key specifications:

  • Size: 34.93 × 50.8 × 7.95

  • Material: VITON (FKM)

  • Structure: TCV

  • Application: Vickers / Oilgear PVG065 variable piston pumps

This high-pressure oil seal is designed specifically for hydraulic pump shaft sealing and has been successfully used as a replacement seal in PVG065 applications.

How the Right Oil Seal Reduces Downtime and Costs

By selecting a seal designed for real operating conditions, users can:

  • Eliminate repeated oil leakage

  • Reduce unplanned maintenance

  • Extend pump service life

  • Improve hydraulic system reliability

In high-pressure hydraulic systems, a reliable oil seal is not a minor component — it is a key factor in system performance.


If your PVG065 variable piston pump continues to leak oil despite repeated seal replacement, it is time to re-evaluate the sealing solution.

Choosing a high pressure VITON oil seal designed for PVG065 pumps can solve the problem at its source — not temporarily, but permanently.


 
 
 

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