Which Key Parts Should Be Replaced During Concrete Pump Truck Hydraulic Pump Maintenance?

When a concrete pump truck’s hydraulic pump starts showing signs of decreased efficiency, abnormal noise, or internal leakage, timely maintenance and replacement of worn components is essential to restore optimal performance. For commonly used pump models like KAWASAKI K5V200 or K3V112, replacing high-wear and core components is crucial.

Here’s a breakdown of the key parts that should be checked and replaced during hydraulic pump repairs:

1. Piston & Shoe Assembly
   These are prone to wear under high pressure and prolonged use. Worn piston shoes can lead to poor sealing, reduced flow, and uneven operation—making them one of the most frequently replaced components.

2. Cylinder Block & Valve Plate
   Scratches on valve plate surfaces or inner wall wear in the cylinder block can result in internal leakage and system vibration. It’s best to replace the entire group to maintain internal sealing and balance.

3. Drive Shaft
   The drive shaft connects the motor to the pump and is the system’s power transmission core. Inspect for signs of bending, cracking, or spline wear.

4. Swash Plate & Support Components
   Under long-term impact loads, swash plates may crack or wear unevenly. Retainers and support blocks may loosen or deform, affecting the pump’s angle control and operation.

5. Spring & Ball Guide
   Though small, these components are critical for controlling oil flow direction. Aging or damaged units can impair startup behavior and response precision.

Replacement Recommendations

• Replace the entire component set when possible to ensure consistent fit and avoid secondary failures

• Choose precision parts with heat treatment and CNC machining for longer service life

• Work with suppliers who provide OEM number cross-reference and offer technical support