NEIEP Mechanics Practice Exam

The correct approach to easing down the platen plate when it is hard against the bolsters is by utilizing the manual lowering valve. This method is specifically designed to allow for controlled descent of the platen, ensuring that it lowers smoothly and safely without applying undue force. The manual lowering valve typically releases hydraulic pressure, which allows the platen to gently descend, preventing potential damage to the equipment or the workpiece.

Using a hydraulic jack, while it can exert force, may not provide the precise control needed in this situation and could risk damaging components. Applying force with a wrench is not advisable as it can lead to injury or mechanical failure. Adjusting the control valve may also provide a means of lowering the platen, but it often involves adjustments that might not directly facilitate a safe and immediate lowering action in the case of a jam. Thus, the manual lowering valve is the most appropriate tool for this situation.