Hydraulic Pump Long-Term Storage? 5-Step Professional Maintenance Guide | Guangdong Haozheng Hydraulic Equipment Co., Ltd.

As the core power source of hydraulic systems, the performance stability of hydraulic pumps directly impacts equipment operational efficiency. As hydraulic technology experts, Guangdong Haozheng Hydraulic Equipment Co., Ltd. emphasizes: when your hydraulic pump (especially precision plunger pumps) requires extended storage, professional maintenance is mandatory to prevent irreversible damage. Below is our standardized 20-year field-validated maintenance procedure.

5 Technical Reasons for Complete Oil Drainage

1. Fluid Contamination: System "Blood" Purification

Hydraulic oil accumulates metal particles and dust during storage. Our lab data shows:

• 300% average increase in >5μm particles after 1-year storage

• These contaminants accelerate wear in precision components (valve plates, pistons)

2. Oil Degradation: Performance Deterioration

Oxidized hydraulic oil exhibits:

• Viscosity variation >±10%

• Increased acid number (>0.5mgKOH/g)

• Reduced demulsibility We recommend regular testing with oil analysis equipment or direct replacement.

3. Moisture Corrosion: Silent Killer

Stored pumps are prone to condensation causing:

• Plunger pump bushing corrosion

• Bearing pitting

• Valve spool sticking Our case studies show unmaintained pumps have 5x higher corrosion failure rates.

4. Seal Aging: Preventive Replacement

Key inspection points:

• Shaft seals (replace every 2 years)

• O-rings (replace every 3 years)

• Cover gaskets (replace every 5 years) OEM seals last 30% longer.

5. Performance Recovery: Renewed Efficiency

After oil change:

• Volumetric efficiency recovers to >95%

• Noise reduces by 3-5dB

• Temperature rise decreases 10-15℃

Professional 5-Step Hydraulic Pump Preservation

Step 1: Complete Oil Drainage

1. Operate pump for 3 minutes to reach 40-50℃

2. Open all drain ports (including case drain)

3. Blow residual oil with compressed air (≤0.3MPa)

Step 2: System Flushing

Use Guangdong Haozheng specialty flushing oil (ISO VG22):

• Plunger pumps: 30-minute flush

• Gear pumps: 15-minute flush Post-flush cleanliness: ISO 4406 18/16/13 standard

Step 3: Rust Prevention

1. Fill with preservative oil (e.g., Shell Ensis)

2. Manually rotate shaft 5-10 revolutions

3. Seal all ports

Step 4: Storage Environment Control

• Temperature: 15-35℃

• Humidity: ≤60%RH

• Recommended: Use desiccant cabinets

Step 5: Pre-commissioning Check

Before restart:

1. Install new filter (β≥200)

2. Fill with specified hydraulic oil

3. Run unloaded for 30 minutes

3 Expert Tips for Extended Service Life

1. Regular Wake-up: Unloaded operation every 3 months (10 minutes)

2. Oil Monitoring: Sample testing every 6 months

3. Professional Service: Contact Guangdong Haozheng for customized plans

For high-value plunger pumps, we recommend smart monitoring systems for real-time storage tracking. For technical support or OEM maintenance kits, please contact our service hotline.

(Technical standards established by Guangdong Haozheng Hydraulic Equipment Co., Ltd. R&D Center. Please credit source when reposting. Refer to equipment manuals for specific operations.)