FAQ on Vacuum Pump (PD136)

	The oil level gauge came out, but it is hard to put it back. Please tell us how to press it into the position.
	Please cover the gauge with a cloth and beat it lightly with a impact hammer to press the gauge into the position. Note that the oil level gauge comes out because there is an internal pressure. Please attach the cooling faucet or perform the oil maintenance more severely in the case the water or the organic solvent mixes into the oil.