Sany Excavator Double Gear Pump 60257790

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Sany excavator double gear pump 60257790

Function

1. Provides dual independent hydraulic power output:

Front pump (large displacement side): Primarily supplies hydraulic fluid to the excavator's main working devices, including the boom cylinder, arm cylinder, and bucket cylinder for complex movements.
Rear pump (small displacement side): Primarily supplies the swing motor, travel motor, or auxiliary circuits (such as bulldozer blades, hydraulic breakers, grapples, and other attachments).
It achieves two working modes: "dual pump splitting" or "dual pump merging," automatically switching based on the load requirements of the main valve to improve system efficiency.

2. Maintaining the Stability of Hydraulic System Pressure and Flow Rate

The system utilizes a fixed-displacement gear pump structure, maintaining a relatively stable flow output within the engine speed range.
In conjunction with Sany excavator's load-sensing multi-way valve or constant power control system, it achieves "on-demand oil supply," reducing heat generation caused by excess flow overflow.
Even during drastic load fluctuations (such as when the bucket suddenly encounters a hard object), the system can quickly establish pressure, preventing motion delays or engine stalling.

DETAILS

Advantages

1. High efficiency and low energy loss: High volumetric efficiency (≥92–95%), low internal leakage, slow hydraulic oil temperature rise, and a dual-pump structure that supports load-sensing matching and on-demand oil supply, reducing overflow losses. Compared to a single large-displacement pump, it can reduce the overall energy consumption of the hydraulic system by 10–15%, improving fuel efficiency (actual tests on Sany medium and large-sized models such as the SY215/SY365 series show fuel savings of 5–12%).

2. Excellent Compound Motion Coordination: Independent output of the front/rear pumps (large displacement for main work + small displacement for slewing/traveling) enables efficient and coordinated operation of multiple actuators simultaneously. It supports automatic switching between dual-pump confluence (high speed under light load) and divergence (high force under heavy load), ensuring that digging, slewing, and traveling operations do not interfere with each other during compound movements. This improves working efficiency in compound conditions by 15–25%, resulting in smooth movements without noticeable lag, making it suitable for high-intensity compound scenarios such as mining, earthmoving, and demolition.

Symptom

1. Early/Minor Fault Symptoms:
Slight abnormal noise occurs during pump operation, especially noticeable at low engine idle speed or during cold starts; hydraulic oil temperature rises rapidly, reaching above 70℃ after 20-30 minutes of normal operation (the normal range should be 50-70℃), and the oil tank surface feels noticeably hot; the excavator's movements are slightly sluggish or weak, especially during complex movements (such as digging + slewing), with the boom/arm speed being slower than usual.

2. Moderate Fault Symptoms:
Significant weakness in one hydraulic circuit: slow boom lifting, insufficient bucket digging force, slow slewing speed, and weak travel; severe stuttering or interference in combined movements, such as noticeably slow slewing during digging, weak boom lifting during travel, or one side operating normally while the other is significantly sluggish; large fluctuations in the main pump pressure gauge needle, causing the excavator's movements to be "sudden and erratic" or "jerky"; slight oil leakage from the pump body/pipelines, with oil stains appearing at the pump shaft end, side plate joint surface, or oil outlet.

Troubleshooting suggestions

1. Cumulative working hours: 8000–12000 hours (mainstream recommended threshold, approximately 4–6 years of service life, depending on intensity).
Replace during hydraulic system overhaul (e.g., when the main pump, control valve, multi-way valve, and hydraulic cylinder are repaired simultaneously).
2. Long-term harsh working conditions: heavy-duty mining, high-intensity earthmoving operations, severe hydraulic oil contamination, frequent clogging of the oil inlet filter, and oil temperature consistently exceeding 80℃.
3. Findings during regular maintenance checks: oil leakage at the pump shaft end, minor cracks in the pump body, aging of the suction pipeline, and severe wear of the coupling.

Preventive Maintenance Recommendations:
1. Every 500–1000 hours: Check for leaks at the pump end, unusual noises, oil temperature, oil level, and filter condition.
2. Every 2000–3000 hours: Replace hydraulic oil and filter element.
3. Before starting work each day: Warm up the machine at low speed for 10–15 minutes, observing the pump sound and response.
4. Record working hours, oil temperature, and the time when unusual noises occur, to facilitate early warning.

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