A front-mounted loader includes a pair of loader arms each having a rear end pivotally coupled to a loader mast which, in turn, includes lower and upper cross pins respectively located in an upwardly opening and forwardly opening pin receptacles. The forwardly opening receptacle of each loader mounting frame forms a fixed part of a latch assembly defining an upper region of the mounting frame and including latch member mounted for pivoting about a horizontal axis and having a forward nose provided with a downwardly opening receptacle which engages the upper cross pin when the mast is latched to the mounting frame. An over center biasing spring is connected to each latch member and resists movement either from a latching position or an unlatching position. Each mast carries a latch member operating rod which, during detaching the mast from the associated loader mounting frame, acts to engage and move the latch member from its unlatching position, to which it has previously been manually moved, to a latching position once the upper cross pin is moved forwardly from the associated forwardly opening pin receptacle of the mounting frame.