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| Illustration 1 | g00602123 |
(1) Pilot and travel speed manifold. (2) Accumulator. (3) Right hand pilot valve (joystick). (4) Left hand pilot valve (joystick). | |
The pilot hydraulic system is used to route oil to the bank valve. Refer to the Systems Operation, "Bank Valve" for more information on the operation of the bank valve.
The pilot hydraulic system consists of the following components: pilot and travel speed manifold (1), accumulator (2), right hand pilot valve (joystick) (3) and left hand pilot valve (joystick) (4) .
The oil for the pilot hydraulic system is supplied by the gear pump. Refer to the Systems Operation, "Piston and Gear Pump" for more information on the gear pump.
Pilot and Travel Speed Manifold
The pilot and travel speed manifold provides pilot oil for the pilot system. The manifold also supplies oil for the following components: the high speed operation of the travel motors, the parking brake for the swing motor and the combined flow valveRefer to the Systems Operation, "Pilot and Travel Speed Manifold" for more information.
The accumulator is mounted on the pilot and travel speed manifold. The accumulator supplies a limited amount of oil to the pilot system after the engine is shut off. Refer to the Systems Operation, "Pilot and Travel Speed Manifold" for more information on the accumulator.
Pilot Valves (Joysticks)
The pilot oil flows from the pilot and travel speed manifold to the pilot valves (joysticks) (3) and (4). The pilot valves route pilot oil to the appropriate spools in the bank valve. Refer to the Systems Operation, "Pilot Valve (Joystick)" for more information on the pilot valves (joysticks).
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| Illustration 2 | g00602137 |
(3) Right hand pilot valve (joystick). (4) Left hand pilot valve (joystick). (A) Pilot oil for raising the boom. (B) Pilot oil for lowering the boom. (C) Pilot oil for opening the bucket. (D) Return line for the pilot valves. (E) Supply line for the pilot valves. (F) Pilot oil for closing the bucket. (G) Pilot oil for moving the stick inward. (H) Pilot oil for moving the stick outward. (I) Pilot oil for swinging the cab to the right. (J) Pilot oil for swinging the cab to the left. | |
HOLD Position
When the pilot valves (joysticks) are in the HOLD position, the supply line for the pilot valves (E) is blocked. The pilot valves will return to the HOLD position when the pilot valves are released. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
BOOM LOWER Position
When the right hand pilot valve is moved to the BOOM LOWER position, the supply line is open to line (B). Line (B) routes oil to the boom control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the head end of the boom cylinder. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
BOOM RAISE Position
When the right hand pilot valve is moved to the BOOM RAISE position, the supply line is open to line (A). Line (A) routes oil to the boom control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the rod end of the boom cylinder. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
BUCKET CLOSE Position
When the right hand pilot valve is moved to the BUCKET CLOSE position, the supply line is open to line (F). Line (F) routes oil to the bucket control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the head end of the bucket cylinder. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
BUCKET DUMP Position
When the right hand pilot valve is moved to the BUCKET DUMP position, the supply line is open to line (C). Line (C) routes oil to the bucket control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the rod end of the bucket cylinder. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
STICK OUT Position
When the left hand pilot valve is moved to the STICK OUT position, the supply line is open to line (H). Line (H) routes oil to the stick control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the head end of the stick cylinder. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
STICK IN Position
When the left hand pilot valve is moved to the STICK IN position, the supply line is open to line (G). Line (G) routes oil to the stick control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the rod end of the stick cylinder. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
SWING LEFT Position
When the left hand pilot valve is moved to the SWING LEFT position, the supply line is open to line (J). Line (J) routes oil to the swing control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the swing motor. The swing motor will swing the cab to the left. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).
SWING RIGHT Position
When the left hand pilot valve is moved to the SWING RIGHT position, the supply line is open to line (I). Line (I) routes oil to the swing control valve in the bank valve. The pilot oil shifts the spool. Oil can then flow to the swing motor. The swing motor will swing the cab to the right. Refer to the Operation and Maintenance Manual, SEBU7203, "Joystick Controls" for more information on the operation of the pilot valves (joysticks).