https://www.btlasfilters.com/showproducts/productid/6475058/replacement-leybold-exhaust-filter-971431120/The Leybold SV750B vacuum pump, a commonly used vacuum generating device in laboratories and small industrial systems, is widely applied in rotary evaporation, vacuum drying, packaging, and educational experiments due to its simple structure, convenient operation, and low cost. However, its internal vanes, rotor, and pump chamber are constantly subjected to high-speed friction and an oil-gas environment. Without scientific and systematic maintenance, it is prone to decreased pumping efficiency, increased noise, oil emulsification, and even jamming. Establishing a periodic and standardized maintenance system for the Leybold SV750B vacuum pump is crucial for extending equipment life and ensuring vacuum performance.
I. Routine Inspection (Before and After Each Use)
Check Oil Level and Quality: Observe through the sight glass; the oil level should be between "MIN" and "MAX". If the oil is white (water ingress), cloudy, or dark brown (overheating and carbonization), it must be replaced immediately.
Listen to Operating Sound: Normally, it should be a uniform, low hum. If a metallic friction sound or abnormal vibration occurs, it may indicate worn vanes or foreign matter entering the system.
Confirm No Oil Spraying from the Exhaust Port: If there is obvious oil mist, it indicates that the oil-gas separator is clogged or that too much oil has been added.
II. Weekly Maintenance
Clean the intake filter: Remove the filter element and blow it clean from the inside out with compressed air to prevent dust from entering the pump chamber and accelerating wear;
Drain condensate (if equipped with a gas ballast valve): Turn on the gas ballast and run for 5–10 minutes to remove water vapor from the oil, then turn it off to restore high vacuum capability;
Check pipeline sealing: Shine a flashlight on the joints or use leak detection fluid to check for minor leaks.
III. Monthly Deep Maintenance
Replace Vacuum Pump Oil:
Drain the oil while the pump is warm (after running for 10 minutes) to remove contaminants;
Use genuine manufacturer's oil (e.g., ISO VG100 mineral oil). Do not mix with synthetic oil or regular machine oil;
Clean the oil return channel and oil tank to prevent sludge blockage from affecting lubrication circulation;
Test the ultimate vacuum: Measure with a thermocouple gauge. If >5 × 10⁻⁶ mbar, check for internal wear or seal failure.
IV. Quarterly/Semi-annual Comprehensive Overhaul
Inspect vanes and springs: Vanes worn beyond 0.2mm or cracked must be replaced; loss of spring elasticity will cause poor vane engagement.
Clean carbon deposits from the pump chamber: Briefly circulate and flush with a special cleaning agent or new pump oil to remove high-temperature polymerization residues.
Check motor rotation and belt tension (belt-driven type): Ensure efficient and stable power transmission.
V. Annual Major Maintenance
Disassemble and inspect bearings and rotor: Measure the clearance to ensure it is within tolerance.
Replace all seals (oil seals, O-rings).
Calibrate pressure gauges and safety valves (if applicable).
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