Rolair VT25BIG User Manual (English)

Questions and Answers:

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William MasonJul 26, 2025
Why is my Rolair VT25BIG Air Compressor pump slow to build tank pressure?
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  Eric HallJul 27, 2025
  A slow-building tank pressure in your Rolair Air Compressor can stem from several issues: * A loose or slipping belt: adjust the belt tension. * Excessive leaks in the system: correct any air leaks. * A blown gasket: replace the head gaskets. * A broken reed valve: replace the reed valves. * An obstructed intake filter: clean or replace the intake element. * A leaking regulator: replace the regulator. * A defective pilot valve: replace the pilot valve.
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woodmariahJul 31, 2025
What to do if my Rolair VT25BIG Air Compressor motor trips the overload/reset button?
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  rojasadamJul 31, 2025
  If the motor trips the overload/reset button, it might be due to several reasons: * The motor is starting and stopping too often: consider installing a constant speed or dual control kit. * The overload is defective or weak: replace the overload. * Improper gauge of extension cord: use longer lengths of air hose or a heavier cord. * Stripped or poorly tightened motor thru bolts: retighten or replace the stripped thru bolts. * Cracks in the end bell or housing: take the unit in for service.
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patriciamyersAug 4, 2025
What to do if my Rolair VT25BIG electric motor is dead and won't hum?
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  Melissa FlowersAug 4, 2025
  If your Rolair Air Compressor's electric motor is dead and doesn't even hum, check for these potential causes: * The thermal overload tripped: locate and push the reset button. * The reset is physically broken: replace the overload/reset. * Loose motor leads or electrical connections: locate and correct any loose electrical connections. * A short in the power cord: replace the power cord.
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Michael GreeneAug 8, 2025
Why does my Rolair VT25BIG Air Compressor have excessive oil consumption?
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  dylanrobinsonAug 8, 2025
  Excessive oil consumption in your Rolair Air Compressor might be caused by: * Too much oil in the crankcase: drain it to the proper level. * Improper weight of oil: replace it with the proper oil. * An obstructed crankcase vent: replace the dipstick or oil fill plug/crankcase vent. * Dirty or plugged intake filter: clean or replace the intake filter. * Worn piston rings or a scored cylinder: take the unit in for service.
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Matthew JamesAug 12, 2025
What to do if my Rolair VT25BIG Air Compressor is overheating?
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  Anthony BaileyAug 12, 2025
  If your Rolair Air Compressor is overheating, consider the following: * Poor ventilation: relocate the compressor to a better-ventilated area. * Improper pump rotation: contact an electrician. * Internal pump problem: take the unit in for service.
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Shannon YatesAug 17, 2025
Why is my Rolair VT25BIG gasoline engine hard to start?
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  monica81Aug 17, 2025
  If the gasoline engine of your Rolair Air Compressor is hard to start, it could be due to: * A fouled, incorrect, or improperly gapped spark plug: install the proper spark plug after gapping it to factory specifications. * Improper engine oil level: fill to the top of the threads for the oil plug. * Improper weight of pump or engine oil: change to the proper weight of oil for the operating temperature. * Improper or old gas: take the unit in for service.
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Kevin RiveraAug 21, 2025
What causes a knocking noise in my Rolair VT25BIG Air Compressor?
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  Morgan DuncanAug 21, 2025
  A knocking noise in your Rolair Air Compressor could be due to: * A loose pulley or flywheel: tighten the appropriate parts. * Loose belts: adjust the belt tension. * An internal pump problem: take the unit in for service.