BE6006D310 | Genuine Hyundai® Hydraulic Power Unit 2011-2015 Sonata Hybrid

The HPU supplies pressurized hydraulic fluid that powers:

• Cylinders

• Hydraulic motors

• Valves

• Actuators

Without an HPU, the hydraulic system cannot operate.

2. Convert Energy Into Usable Work

It converts mechanical energy (from an electric motor or engine) into hydraulic energy, which can lift, push, pull, rotate, or clamp heavy loads.

3. Control Movement and Force

An HPU allows precise control of:

• Speed

• Direction

• Force

• Position

Used in machines that require smooth and accurate operation.

4. Support Heavy-Duty Applications

Hydraulic power units deliver extremely high force in a compact system, making them perfect for:

• Construction equipment

• Industrial presses

• Cranes and lifts

• Mining equipment

• Marine and offshore machinery

5. Maintain System Reliability

HPUs include filtration, cooling, and monitoring components that keep hydraulic fluid:

• Clean

• Cool

• At the correct pressure

This ensures long-term reliability and protects the hydraulic system.

6. Centralize Power for Multiple Functions

One HPU can power multiple hydraulic functions on a machine—for example on an excavator:

• Boom lift

• Stick movement

• Bucket curl

• Swing motor

1. Weak or Slow Hydraulic Functions

• Cylinders move slowly

• Motors lack torque

• Machine struggles to lift or push
  This usually means low pressure, pump wear, or internal leaks.

2. Overheating Hydraulic Oil

If the oil gets too hot, you may notice:

• Hot reservoir

• Warning lights

• Burnt smell
  Caused by clogged filters, low fluid, cooling system failure, or pump inefficiency.

3. Abnormal Noises

• Grinding

• Whining

• Knocking
  These sounds often indicate a failing pump, cavitation (air in the oil), or low fluid levels.

4. Hydraulic Pressure Fluctuations

• Pressure spikes

• Pressure drop

• Inconsistent readings on gauges
  This can be due to pump wear, bad valves, or contaminated oil.

5. External Leaks

Visible leaks from:

• Hoses

• Fittings

• Reservoir

• Pump seals
  Leaks reduce system pressure and can cause overheating.

6. Foamy or Milky Hydraulic Oil

This means air or water is in the system — both can damage the HPU.

7. Hard Starting or HPU Not Running

• Motor doesn’t turn

• Pump doesn’t build pressure
  May be caused by electrical issues, motor failure, or internal pump problems.

8. Excessive Vibration

Measured vibration or shaking can indicate:

• Misaligned pump

• Failing bearings

• Loose mounting bolts

9. Contaminated Hydraulic Fluid

Dirty oil leads to clogged filters and valve issues:

• Sluggish performance

• Increased wear

• High temperatures