. OPERATION MACHINE OPERATIONS AND CONTROLS OPERATION MACHINE OPERATIONS AND CONTROLS REMARK Install the O-ring into retaining hole (1) of the arm and bucket. When installing the bucket, the O-rings are easily damaged, so fit the regular groove (4). pin. 3 - 113 4. Align th e arm w ith holes ( 1) of the replacemen t bucket and the link with holes ( 2), then in sert gre ase-coated pins (A) and (B) into hole (1) an d hole (2) respecti the O-rings on the b oss of the arm end as shown in the diagram (3) on t he right. When 5. Install th e stopp er bolts a nd nuts f or each pin, then grease the