The shells used by the Dreadquake Mortar are huge, temperamental and cumbersome, making the weapon slow to reload.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Unless a Slave Ogre is present as a part of the war machine’s crew, after the Mortar has fired once, you must roll a 3+ on a D6 whenever you wish to fire it again. If this roll is failed, you may not fire this turn but may fire again normally next turn.