SEAL 9T5947 - Caterpillar

Hold Position
In HOLD position, spool (4) stops pressure oil in passage (10) from going into ports (2) and (3). The oil in port (3) to rod end of left angle cylinder and head end of right angle cylinder is blocked. The oil in port (2) to rod end of right angle cylinder and head end of left angle cylinder is also blocked. The blade is now held in position. The oil in passages (5), (6), (12), (14), and (15) goes to drain.Spring (16) now holds spool (4) in this position.Angle Left Position
Angle Valve (Angle LEFT Position)
(2) Port to rod end of right cylinder and head end of left cylinder. (3) Port to rod end of left cylinder and head end of right cylinder. (4) Main control spool. (5) Passage to tank. (6) Signal passage to primary resolver. (10) Passage. (12) Signal cavity. (14) Signal passage to primary resolver. (15) Passage to tank. (16) Spring.In the angle LEFT position, spool (4) is moved down. Oil from passage (10) now goes around the spool into port (3). Most of the oil goes to both the rod end of left angle cylinder and the head end of right angle cylinder. Some of the oil in port (3) goes through passage (6) to the resolver network to adjust the pump as required by the load. The oil from the head end of the left angle cylinder and the rod end of the right angle cylinder is forced through port (2), around spool (4), through signal passage (14), and tank passage (15) to tank. In angle LEFT position, pressure in cavity (12) is equal