ENGINE AR-COMPLETE 2456958 - Caterpillar

(1) Control valve A side Check the set values of main relief pressure, bucket cylinder overload relief pressure, boom cylinder overload relief pressure and left travel motor corssover relief pressure. * A in the fig. shows control valve A.1. Checking of main relief pressure 1) Perform "bucket scoop" or "bucket dump" operation of bucket cylinder (18) and check the set pressure of main relief valve (19).2. Temporary setting of main relief pressure 1) Use a spanner to loosen the lock nut of main relief valve (19). Then tighten the adjusting screw about 1/2 turn clockwise using a hexagon socket