Valve Service and Maintenance includes installing new seat inserts, cleaning or replacing valve guides, servicing the camshaft and camshaft bearings, and timing the valves.
气门维修包括镶配气门座，清洁或更换气门导管，保养凸轮轴和凸轮轴轴承，气门的正时调整。
There are no vertical guides or CAM ramps used for positioning, and no slides or bearings used in its construction, making the Pop-up Transfer Conveyor simple to maintain.
无用于定位的垂直面或凸轮，无建筑用滑动装置或轴承，使输送机易于维护。
This can be achieved, by example, by bearings that are moveable on suitable guides, or by mounting the support on a plurality of pivot arms of unequal lengths.
这例如可以通过可在合适的导轨上移动的轴承或者通过在多个非等长的摇臂上安装支承件来实现。
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