The 705-86-14000 Hydraulic Pump Troubleshooting & Replacement Guide
For any Komatsu PC20-5 or PC30-5 mini excavator owner or operator, efficient hydraulics are paramount. The 705-86-14000 hydraulic pump (also known as 7058614000) is the command center for your machine's digging, lifting, and swinging power. When this critical component begins to falter, performance suffers immediately, leading to costly downtime and lost productivity. Don't let a failing Komatsu hydraulic pump assembly derail your operations.
This in-depth guide is engineered for maintenance professionals, focusing on diagnosing common issues with the 705-86-14000 gear pump and providing practical steps for its replacement, ensuring your PC20-5 main pump or PC30-5 hydraulic system runs at peak efficiency.
Decoding the 705-86-14000: Compatibility & Key Applications
Understanding where your aftermarket hydraulic parts for Komatsu fit is crucial. The 705-86-14000 is a dual-stage gear pump primarily found in Komatsu's compact excavator range, often coupled with robust **3D84 series engines**.
| Category | Applicable Models / Part Variations |
|---|---|
| Exact Machine Models | Komatsu PC20-5 Excavator, Komatsu PC30-5 Mini Digger |
| Engine Match | Komatsu 3D84 Engine, 3D84N-1, 3D84-1 (Hydraulic Drive) |
| Part Number Variants | 7058614000, 705-86-14000 Pump, PC20-5 Hydraulic Main Pump |
| Common Search Terms | Komatsu PC30-5 hydraulic pump replacement, mini excavator pump fix, 705-86-14000 rebuild kit |
Critical Symptoms of a Failing 705-86-14000 Hydraulic Pump
Proactive diagnosis saves significant costs. Watch for these tell-tale signs that your Komatsu PC20-5 hydraulic pump is nearing its service life:
- Loss of Power & Slow Operation Cycles: Your excavator feels sluggish, especially when lifting heavy loads or digging. The bucket's curl time increases, indicating the hydraulic pump for Komatsu excavator is not delivering adequate flow (GPM). This is often the first and most critical indicator of internal wear within the 705-86-14000.
- Excessive Noise & Vibration: Beyond the normal operating hum, listen for a distinct high-pitched whine that increases with engine RPM or hydraulic demand. This 'cavitation' noise suggests air ingress, fluid starvation, or severe internal component wear in your PC30-5 main hydraulic pump. Vibrations can often accompany this, transmitted through the controls.
- Overheating Hydraulic Fluid: If your hydraulic oil runs consistently hotter than usual, it’s a strong sign of internal leakage within the 705-86-14000 hydraulic pump. The increased friction from bypassed fluid generates excess heat, degrading oil prematurely and risking seal failure throughout the system.
- Jerky or Erratic Movements: Inconsistent or unpredictable hydraulic movements, particularly during fine grading or delicate tasks, can point to pressure fluctuations caused by a worn 705-86-14000 struggling to maintain consistent output.
💡 Expert Tip from Bee Spare Parts:
Always inspect the pump's drive shaft for any excessive play or scoring during removal. These indicate potential coupling issues or severe bearing failure within the 705-86-14000 hydraulic pump assembly.
Choosing the Right 705-86-14000 Replacement
When replacing a critical component like the 705-86-14000, quality is non-negotiable. An inferior aftermarket hydraulic pump can fail prematurely, costing you more in the long run. Look for units that are:
- Pressure Tested: Ensures the pump meets OEM specifications for maximum working pressure and flow.
- Dynamically Balanced: Minimizes vibration and extends pump life.
- Built with High-Grade Materials: Essential for durability in demanding excavation environments.
Need a Reliable 705-86-14000 Hydraulic Pump for Your Komatsu?
Don't compromise on your Komatsu PC20-5 or PC30-5 excavator's performance. Get a quick quote for an OEM-grade 705-86-14000 hydraulic pump replacement today.
We supply robust solutions for Komatsu 3D84 engine series & PC-series excavators worldwide.
