COMPONENT OPERATION / Steering Pilot Valve OPERATION Sleeve (3), spool (4), and drive (7) are mutually connected by pin (5). When the handle (or the spool (4)) is turned, a relative angular difference arises between sleeve (3) and spool (4) because the hole of spool (4) is a lengthened one. Movement of the steering handle is conveyed only to spool (4), and port P (from the steering pump) is connected to port R (to the steering valve) or port L through sleeve (3) and spool (4). 4 8 3 2 Port L Port R Handle 7 11 7 Port T Port P T4GB-03-04-007 11 1 6 10 9 2 T1F3-03-07-002 1 5 4 3 7 8 T3-4-3