Construction Machinery
Thermal-conduction and industrial material solutions for the construction machinery industry, suitable for harsh conditions such as high vibration, dust and wide temperature ranges, helping improve heat dissipation efficiency and equipment operating reliability; RoHS and other compliance documents and sample support are available on request.
Construction Machinery — The "Heart Guardian" of Hydraulic Systems
Construction machinery is one of the most widely used fields for hydraulic systems. The boom, arm, travel and swing actions of excavators, loaders and bulldozers all rely on hydraulic pumps for power. Once the main pump develops increased internal leakage, sluggish action or abnormal noise, the operating efficiency of the entire machine drops significantly. Traditional repair solutions rely on OEM parts, which are expensive and have long lead times, often causing long-term equipment downtime. Hailinke provides replacement pump parts fully interchangeable with OEM dimensions, greatly reducing procurement costs while ensuring performance.
Common Problems with Construction Machinery Hydraulic Pumps
Below are the three most common hydraulic pump failures encountered in construction machinery maintenance, helping you quickly identify the root cause.
Slow, weak operation
- Problem
- Slow boom lifting, travel deviation, and weak swing on excavators, especially noticeable during combined operations.
- Root cause
- Wear between the cylinder block and valve plate inside the pump increases internal leakage and reduces volumetric efficiency; clearance between plungers and cylinder block bores exceeds specification, causing high-pressure oil leakage.
Excessive hydraulic oil temperature
- Problem
- After 1–2 hours of continuous operation, oil temperature spikes, accompanied by further slowdown of actions.
- Root cause
- Wear on the valve plate surface destroys oil film lubrication, and mechanical friction generates heat; internal leakage causes high-pressure oil to return directly, converting energy into heat.
Abnormal noise and vibration
- Problem
- The pump emits periodic abnormal noise, accompanied by pipeline vibration, and severe cases may show shaking.
- Root cause
- Uneven clearance between plungers and cylinder block bores and deformation of the return plate cause piston sticking; clogged suction strainer causes cavitation.
Fault Repair and Prevention Solutions
For the above common problems, we recommend the following systematic solutions, from repair to prevention in one step.
Restore Volumetric Efficiency and Solve Slow, Weak Operation
- - Repair goal：Restore volumetric efficiency and solve slow, weak operation
- - Key steps：Replace the cylinder block, valve plate, plungers and return plate as a complete set to avoid poor matching caused by single-part replacement
- - **Recommended product：Rotary Group series**
- - Applicable brands：Rexroth A8V/A10V, Komatsu HPV, Hitachi HPV, Caterpillar A8V, etc.
- - Expected result：Operation returns to like-new condition, and major overhaul interval is extended by more than 30%
Precision Matching and Replacement of Valve Plate
- - Repair goal：Reduce friction-induced temperature rise and solve overheating failures
- - Key steps：Selectively grind the cylinder block end face and valve plate to ensure flat contact rate ≥ 90%
- - Recommended product：Valve Plate series
- - Applicable brands：Fully compatible with all series
- - Note：After replacement, run in unloaded for 30 minutes before working under load
Inspection and Maintenance of Suction System
- - Repair goal：Eliminate cavitation noise and vibration
- - Key steps：Clean or replace the suction strainer, check the sealing of the suction line, and top up hydraulic oil to the standard level
- - **Recommended product：Suction Strainer / Seal Kit**
- - Maintenance interval：Inspect once every 500 operating hours
Recommended Parts & Supporting Services
Recommended Parts
| Category | Recommended model | Applicable brand | Application |
|---|---|---|---|
| Imported silicone | XCV | Brand | Application |
Recommended Products
Halies
Hailinke High-Performance Replacement Hydraulic Pump Assembly
