Due to continuous heavy-load operation, harsh mining environments, dust exposure, and long working hours, the hydraulic system is one of the most failure-prone systems in mining vehicles.

Common hydraulic problems include:

• Weak dumping performance
• Heavy steering operation
• Hydraulic oil leakage
• Slow lifting speed
• Hydraulic pressure loss

HOWO Mining Dump Truck Hydraulic System Overview

The hydraulic system is responsible for controlling:

• Dump body lifting operations
• Steering assistance
• Hydraulic pressure transmission
• Heavy-load unloading functions

A reliable hydraulic system directly affects mining truck productivity, maintenance costs, and operating safety.

Hydraulic System Problem 1: Weak Dump Body Lifting

When a HOWO mining dump truck has insufficient lifting power, the following inspection sequence is recommended:

Step 1: Check Hydraulic Oil Level and Quality

The first step is to inspect:

• Hydraulic oil level
• Oil contamination
• Oil viscosity
• Hydraulic oil temperature

Low oil levels or contaminated hydraulic oil can reduce system pressure and lifting efficiency.

Step 2: Inspect Hydraulic Gear Pump Condition

A worn hydraulic gear pump may cause:

• Low hydraulic pressure
• Slow lifting speed
• Weak dumping force

If internal leakage occurs inside the pump, replacement of the hydraulic gear pump is recommended.

Step 3: Check Multi-Way Valve Pressure

The multi-way control valve regulates hydraulic flow and pressure.

Common problems include:

• Reduced relief pressure
• Valve spool wear
• Internal leakage

A hydraulic valve repair kit can often restore normal performance.

Step 4: Check Hydraulic Cylinder Internal Leakage

If the hydraulic cylinder cannot maintain pressure, internal leakage may occur.

Common solutions include:

• Replace hydraulic cylinder seal kit
• Repair cylinder components
• Replace complete cylinder assembly if the cylinder barrel is damaged

Recommended Replacement Parts for Weak Lifting Problems

Common replacement parts include:

• Hydraulic gear pump
• Hydraulic cylinder seal kit
• Multi-way valve repair kit
• Hydraulic oil filter

Hydraulic System Problem 2: Heavy Steering Operation

Heavy steering is another common failure in HOWO mining dump trucks.

Possible causes include:

• Steering power pump wear
• Steering gear internal leakage
• Steering cylinder seal failure
• Contaminated hydraulic oil

Recommended Inspection Steps

Check Steering Hydraulic Oil

Old or contaminated hydraulic oil may reduce steering system performance.

It is recommended to replace:

• Hydraulic steering oil
• Return oil filter

Inspect Steering Power Pump

A worn steering pump may result in:

• Slow steering response
• Increased steering effort
• Abnormal hydraulic pressure

Check Steering Gear and Hydraulic Cylinder

Internal leakage in the steering gear or hydraulic cylinder can reduce steering assistance.

Replacing seals or repairing the components can restore normal operation.

Hydraulic Oil Leakage Solutions

Hydraulic leakage is commonly caused by:

• Aging seals
• Damaged hydraulic hoses
• Cylinder seal failure
• Loose hydraulic connections

Do Hydraulic Cylinder Oil Leaks Require Complete Replacement?

Not always.

If the cylinder barrel surface is not scratched or damaged, replacing the hydraulic cylinder seal kit can restore sealing performance.

This solution significantly reduces maintenance costs compared with replacing the complete hydraulic cylinder assembly.

Frequently Asked Questions

How often should HOWO mining dump truck hydraulic oil be replaced?

For heavy-duty mining operations, hydraulic oil replacement is recommended every:

• 2,000 working hours
  or
• Every 6 months

At the same time, the return oil filter should also be replaced to maintain hydraulic system cleanliness.

Does hydraulic cylinder leakage require replacing the whole cylinder?

No.

If the cylinder barrel is in good condition without scratches or deformation, replacing the hydraulic seal kit is usually sufficient.

This provides a more economical maintenance solution and reduces equipment downtime.

China HOWO Mining Dump Truck Hydraulic Spare Parts Supplier

We provide professional hydraulic system spare parts solutions for HOWO mining dump trucks, including:

• Hydraulic gear pumps
• Hydraulic cylinder seal kits
• Hydraulic valves
• Steering pumps
• Hydraulic filters
• Hydraulic repair kits

With OEM matching capability and export experience, we help mining companies and equipment distributors reduce maintenance costs and improve vehicle uptime.

For HOWO mining truck hydraulic spare parts sourcing, OEM number matching, and export support, contact our professional team.