Here is a good example of bad cotter key practices, where the cotter keys (split pin) are left to rattle around because of the lose fitting or of the wrong size cotter key allowing it to vibrate in place wearing the holes out.
And other wear points on pinion latches.
ACMOC Membership
955E 12A08263; 955C 12A04040; 955C 12A03563.
No.12 Diesel Motor Grader 8T14777.
No.12 Diesel Motor Grader 9K9320