Loader leveling linkage providing for alteration of its geometry for accommodating different implements

In a tractor-mounted loader including a pair of laterally spaced, parallel boom arms having rear ends respectively pivotally mounted to a pair of support posts and having forward ends adapted for having various types of implements pivotally attached thereto, a lift cylinder connected between each support post and the boom arm associated therewith for moving the boom arms between lowered and raised positions, a leveling linkage associated with each boom arm and including a pivot arm assembly and first and second elongated links with the pivot arm assembly carrying first, second and third pivotal connections coupled respectively to the associated boom arm, at a location between opposite ends thereof, to a first end of the first motion transfer link and to a first end of the second motion transfer link, the first and second motion transfer links having second ends respectively pivotally connected to an associated one of the support posts and adapted for connection to a selected type of implement, the leveling linkages being adapted for effecting pivoting of the selected type of implement about its pivotal connections with the boom arms in response to the boom arms being raised and lowered by the lift cylinders, the improvement comprising:

• said pivot arm assembly being provided with an elongate pivot adjustment slot;
• one of the second and third pivotal connections being located in said elongate slot;
• and releasable latch means for selectively fixing said one of the second and third pivotal connections at a desired first location in said elongate slot for establishing a preselected first geometry in said leveling linkage adapted for effecting tilting of the implement through a first range of motion when the latter is of a first type;
• and said latch means being releasable for permitting said one of the second and third pivotal connections to move to a second desired location in said slot for effecting a second preselected geometry in said leveling linkage for effecting a preselected second geometry in said leveling linkage adapted for effecting tilting of the implement through a second range of motion when the latter is of a second type.