The hydraulic pump is the core component of an excavator hydraulic system. It generates the pressure that powers the boom, arm, bucket, swing motor and travel motors.
When a hydraulic pump begins to fail, the excavator may lose digging power, move slowly, or even stop working completely.
Understanding the most common hydraulic pump failures can help operators identify problems early and prevent costly downtime.
Hydraulic pumps can overheat when operating under excessive pressure for long periods.
Causes include:
- blocked oil cooler
- poor lubrication
- overloaded hydraulic system
Low pressure usually indicates internal wear inside the hydraulic pump.
Symptoms include:
- weak digging force
- slow boom movement
- unstable operation
Grinding or knocking sounds may indicate internal damage such as worn gears or bearings.
This is often a warning sign that the pump needs inspection.
Damaged seals or cracked pump housings may cause hydraulic oil leakage.
Oil leakage reduces system pressure and affects machine performance.
If the pump cannot maintain pressure, the excavator will lose power during digging or lifting operations.
Unusual vibration in the hydraulic pump may indicate internal wear or air entering the hydraulic system.
Dirty hydraulic oil accelerates wear inside the pump and may damage internal components.
To extend the life of a hydraulic pump:
- replace hydraulic oil regularly
- maintain clean oil filters
- inspect hydraulic hoses and seals
- avoid operating under extreme loads for long periods
Guangzhou Tieqi Construction Machinery Co., Ltd. specializes in supplying high-quality excavator and mining equipment spare parts.
Our main products include:
- Excavator hydraulic pumps
- Hydraulic control valves
- Swing motors
- Final drives
- Diesel engines
- Electrical components
With extensive experience in the global construction machinery industry, we provide reliable aftermarket solutions for customers in mining, construction, and heavy equipment maintenance.