 | |
| Illustration 1 | g02176437 |
Pilot Oil Manifold (1) Solenoid valve (hydraulic lockout) (2) Pilot manifold (7) Hydraulic activation valve | |
Solenoid Valve Operation
Solenoid valve (1) is controlled by the hydraulic lockout lever. Solenoid valve (1) controls hydraulic activation valve (7). Hydraulic activation valve (7) controls the flow of pilot oil to the following valves: main control valve, boom regeneration valve, stick regeneration valve and swing control valve.
Hydraulic Lockout Lever
 | |
| Illustration 2 | g01115239 |
Cab (3) Hydraulic lockout lever (LOCKED position) (4) Lever | |
 | |
| Illustration 3 | g01115240 |
Cab (3) Hydraulic lockout lever (UNLOCKED position) (4) Lever | |
 | |
| Illustration 4 | g01115242 |
Hydraulic Lockout Lever (LOCKED Position) (3) Hydraulic lockout lever (4) Lever (5) Plunger (6) Limit switch | |
When hydraulic lockout lever (3) is shifted to the LOCKED position, no signal is sent to the machine ECM. The machine ECM will not send an electrical signal to solenoid valve (1). Pilot oil is not supplied to the main control valve, the boom regeneration valve, the stick regeneration valve, or the swing control valve. The implements are inoperable when the hydraulic lockout lever is in the LOCKED position.
When hydraulic lockout lever (3) is shifted to the UNLOCKED position, lever (3) contacts plunger (5). Plunger (5) causes the electrical circuit of limit switch (6) to be CLOSED. Limit switch (6) sends a signal to the machine ECM. The machine ECM sends an electrical signal to solenoid valve (1). The electrical signal energizes solenoid valve (1). Pilot oil from solenoid valve (1) shifts hydraulic activation valve (7). Pilot oil flows through hydraulic activation valve (7). Pilot oil flows to the main control valve, the boom regeneration valve, the stick regeneration valve, and the swing control valve. The implements are operable when the hydraulic lockout lever is in the UNLOCKED position.
Note: The engine does not start unless hydraulic lockout lever (3) is in the LOCKED position. Ensure that the hydraulic lockout lever is in the LOCKED position when starting the machine.
Solenoid Valve (Locked Position)
 | |
| Illustration 5 | g02176460 |
Partial Diagram of Solenoid Valve (Hydraulic Lockout) (LOCKED Circuit) (1) Solenoid valve (hydraulic lockout) (2) Pilot manifold (7) Hydraulic activation valve (8) Solenoid (9) Spring (10) Spool (11) Line (pilot oil to the boom regeneration valve and the stick regeneration valve) (12) Line (pilot oil to the solenoid valve for the swing parking brake and swing control valve) (13) Line (pilot oil to main control valve) (14) Line (pilot oil to main control valve) (15) Passage (16) Passage (17) Passage (18) Passage (oil flow to hydraulic tank) | |
The solenoid valve (hydraulic lockout) (1) consists of solenoid (8), spring (9), and spool (10) .
When hydraulic lockout lever (3) is in the LOCKED position, plunger (5) is not in contact with hydraulic lockout lever (3). Switch (6) does not complete the circuit that energizes solenoid (8). Solenoid (8) is not energized. Spool (10) is forced upward by spring (9). Pilot oil is not able to flow from passage (15) to passage (17) .
Solenoid Valve (Unlocked Position)
 | |
| Illustration 6 | g02176461 |
Partial Drawing of Solenoid Valve (Hydraulic Lockout) (UNLOCKED Position) (1) Solenoid valve (hydraulic lockout) (2) Pilot manifold (7) Hydraulic activation valve (8) Solenoid (9) Spring (10) Spool (11) Line (pilot oil to the boom regeneration valve and the stick regeneration valve) (12) Line (pilot oil to the solenoid valve for the swing parking brake and swing control valve) (13) Line (pilot oil to main control valve) (14) Line (pilot oil to main control valve) (15) Passage (16) Passage (17) Passage (18) Passage (oil flow to hydraulic tank) | |
When hydraulic lockout lever (3) is in the UNLOCKED position, plunger (5) is in contact with hydraulic lockout lever (3). Switch (6) is CLOSED which completes the circuit that energizes solenoid (8). Solenoid (8) is energized causing spool (10) to shift downward against spring (9). Pilot oil flows from passage (15) to passage (17) .
Hydraulic Activation Valve Operation
Pilot oil flows into hydraulic activation valve (7) at passage (16). Hydraulic activation valve (7) controls the flow of pilot oil from passage (16) to line (11), line (12), line (13), and line (14) .
Locked
 | |
| Illustration 7 | g02176462 |
Hydraulic activation valve (LOCKED position) (2) Pilot manifold (7) Hydraulic activation valve (11) Line (pilot oil to the boom regeneration valve and the stick regeneration valve) (12) Line (pilot oil to the solenoid valve for the swing parking brake and swing control valve) (13) Line (pilot oil to main control valve) (14) Line (pilot oil to main control valve) (16) Passage (17) Passage (19) Drain passage (20) Spool (21) Spring | |
Hydraulic activation valve (7) consists of spool (20) and spring (21) .
When hydraulic lockout lever (3) is in the LOCKED position, solenoid valve (1) is not energized and pilot oil is blocked from entering passage (17). Spool (20) is forced upward by spring (21). Pilot oil is not able to flow from passage (16) to line (11), line (12), line (13), and line (14). Line (11), line (12), line (13), and line (14) are connected to drain passage (19). The machine implements are disabled.
Unlocked
 | |
| Illustration 8 | g02176463 |
Hydraulic activation valve (UNLOCKED position) (2) Pilot manifold (7) Hydraulic activation valve (11) Line (pilot oil to the boom regeneration valve and the stick regeneration valve) (12) Line (pilot oil to the solenoid valve for the swing parking brake and swing control valve) (13) Line (pilot oil to main control valve) (14) Line (pilot oil to main control valve) (16) Passage (17) Passage (19) Drain passage (20) Spool (21) Spring | |
When hydraulic lockout lever (3) is in the UNLOCKED position, solenoid valve (1) is energized and pilot oil enters passage (17). Spool (20) is forced downward against spring (21). Pilot oil is able to flow from passage (16) to line (11), line (12), line (13), and line (14). The machine implements are enabled.