How to maintain hydraulic gear pump?
The core maintenance logic of hydraulic gear pump: clean oil, intact seal, compliant speed and pressure, regular inspection, timely replacement of parts, can greatly extend the service life, reduce oil leakage, noise, and insufficient pressure faults.
A、 Daily use and maintenance (daily/shift)
1. Check the hydraulic oil level and quality
The liquid level should be kept between the tank markings and should not be too low for suction or too high for oil overflow
◦ If the oil turns white, emulsified, blackened, or contains impurities, change the oil immediately
2. Listen to noise and observe vibrations
Normal is stable and low-noise; Sharp whistling=suction/filter blockage; Impact sound=bearing wear
3. Check for oil leakage
Focus on: shaft seals, end caps, oil pipe joints, flanges, timely handling of early micro leaks to avoid dust and water ingress.
4. Prohibit overloading
Long term operation beyond the rated pressure and speed is strictly prohibited, and the pressure of the safety valve cannot be adjusted arbitrarily.
B、 Regular maintenance (based on operating hours)
1. 50-100 hours (new machine running in period)
• Replace hydraulic oil+suction filter element, return filter element
Check the concentricity of the coupling and the tightness of the belt
Tighten the pump body and oil pipe bolts
2. 500 hours
• Change the oil again and replace all filter elements
Check for aging of oil seals and O-rings
Measure the outlet pressure of the pump to determine if the internal leakage has increased
3. 1000 hours/half a year
• Disassembly and inspection: wear and tear of gears, side plates, and bearings
Clean up impurities inside the pump body
• Replace aging seals
4. 2000 hours/year
Comprehensive maintenance: gear clearance, bearing, and side plate wear, replace the assembly if necessary
C、 Hydraulic oil selection (most critical, 80% of damage comes from oil)
1. Recommendation: Wear resistant hydraulic oil L-HM 32 #/46#
32 # for low temperature environment, 46 # for normal temperature use#
2. Oil temperature control: 35-60 ℃
◦>70 ℃ rapid aging of seals, oil oxidation, and increased pump wear
3. It is strictly prohibited to mix different brands and models of hydraulic oil
D、 Installation and usage taboos (frequent pitfalls for foreign trade customers)
1. The oil suction pipeline must not leak air, bend, or have a diameter that is too small → suction, high noise, and inability to increase pressure
2. The oil suction port must be equipped with a filter (≥ 100 mesh) to prevent iron filings and impurities from entering
3. Couplings must be aligned, as eccentricity can quickly wear out bearings and shaft seals
4. It is strictly prohibited to idle or dry grind. Before starting up, make sure to fill the oil tank and exhaust the air
E、 Common faults can be easily diagnosed (can be done as SEO FAQ)
1. Insufficient pressure and lack of energy: dirty oil, clogged filter element, worn gears/side plates, and large internal leakage
2. High noise and shaking: air suction, oil suction pipe leakage, low oil level, coupling eccentricity
3. Oil leakage: oil seal aging, damaged end cap O-ring, loose bolts
4. High oil temperature: long-term overload, poor oil quality, and poor oil return
F、 Long term shutdown maintenance (inventory/foreign trade stocking)
1. Drain the old oil and add rust proof hydraulic oil
2. Block the inlet and outlet of the oil to prevent dust and water damage
3. Apply anti rust oil to the shaft end and cover it with plastic film
4. Store in a dry and ventilated place, avoiding exposure to sunlight and moisture
The above:How to use the car power take-off correctly
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