CYLINDER HEAD GP 4N1817 - Caterpillar

Release all the pressure in the hydraulic system prior to disconnecting any hydraulic lines. If the hydraulic oil pressure is not released completely, oil can spray out of the oil lines under high pressure. Failure to release the system pressure completely can cause personal injury.
1. Remove panel (1).2. Remove fender (2).3. Remove lower panel (3). 4. Disconnect wire to brake reservoir (4) and move it out of the way.5. Disconnect wires to the hydraulic valve (5).6. Disconnect linking (6) from valve assembly (7). 7. Disconnect tube assembly (8).8. Remove mounting bolts (9).9. Remove valve (7). Install in the reverse order. This is a typical disassembly and assembly of a hydraulic control valve and may not be identical to the one on your particular machine. However, it will show similar valve componentry in this family of loader machines.Disassemble & Assemble Hydraulic Control Valve
Start By:a. remove hydraulic control valve 1. Remove three nuts (1) and manifold (2).2. Remove bucket positioner bank (3). 3. Remove O-ring seal (4) and spring (5) and poppet from the bucket positioner bank.4. Remove two screws (6) and valve seal plate (7).5. Remove two screws (8) and cap (9). 6. Remove bolt (10), retainer (11), spring (12) and valve seal plate (13) from the spool. 7. Remove teflon seal (14) and O-ring seal (15) from both ends of spool (16). 8. Remove bucket tilt valve bank (17).9. Remove O-ring seal (18) and spring (19) and poppet from valve bank (17).10. Remove two screws (20) and valve seat plate (21).11. Remove two Allen bolts (22) and solenoid (23). 12. Remove spool (27). Remove teflon seal (25) and O-ring seal (26) from both ends of spool (27). Remove valve seal plate (24). 13. Remove bolt (28), retainer (29) spring (30) and retainer (31) from the end of bucket tilt spool (27). 14. Remove bucket tilt valve bank (32). Remove O-ring seal (33) and spring (34) and poppet.15. Remove two screws (35) and valve seal plate (36).16. Remove two Allen bolts (37) and remove solenoid (38).
Spring pressure is present when bolt (39) is removed.
17. Remove bolt (39) and spacer (40).
Spring pressure is present when bolt (41) is removed.
18. Remove bolt (41), retainer (42) and spring (43).19. Remove detent seat (44),