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| Illustration 1 | g03344205 |
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Auxiliary Hydraulic Systems (1) Main control valve (2) Ball valve (4) Auxiliary control valve (6) Ball valve (7) Ball valve for one-way or two-way flow (9) Pilot control valve (auxiliary) (10) Hydraulic tank (11) Pilot manifold (12) Pilot pump (13) Main pump (14) Main relief valve | |
The 308E can be equipped with an auxiliary system. Main control valve (1) comes standard with auxiliary control valve (4) to provide high-pressure flow to a work tool. The auxiliary system can be used to provide one-way flow to a work tool or two-way flow to a work tool. Ball valve (7) is used to provide a direct return path for hydraulic oil when using a work tool requiring only one-way flow.
The auxiliary system is controlled with pilot control valve (9).
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| Illustration 2 | g03344484 |
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Operators compartment (9) Pilot control valve | |
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| Illustration 3 | g03344208 |
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Ball valve location (2) Ball valve (right side) (6) Ball valve (left side) | |
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| Illustration 4 | g03344209 |
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One-way or two-way flow valve (Control valve compartment) (A) One-way flow position (B) Two-way flow position (1) Main control valve (7) Ball valve (for one-way or two-way flow) | |
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| Illustration 5 | g03344210 |
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One-Way flow to a Hammer Piston (1) Main control valve (2) Ball valve (4) Auxiliary control valve (6) Ball valve (7) Ball valve (for one-way or two-way flow) (9) Pilot control valve (auxiliary) (10) Hydraulic tank (11) Pilot manifold (12) Pilot pump (13) Main pump (14) Main relief valve | |
The One-Way Hydraulic System is for work tools that require one-way hydraulic oil flow. A hammer is a good example.
Note: Ball valve (7) must be put into the OPEN position (A) for one-way operation.
Ball valve (7) controls the path of oil for the one-way hydraulic system. With the lever in OPEN position (A), the return oil from the work tool has a direct return path to the hydraulic tank. This path will decrease the amount of back pressure in the return system and is typically used for a hammer work tool.
Pilot pump (12) supplies oil to pilot manifold (11). When the hydraulic activation lever is activated, pilot oil flows from pilot manifold (11) to pilot control valve (9).
When the pilot control valve is pushed forwards, auxiliary control valve (4) is shifted down.
Main pump (13) sends oil to the main control valve. The oil flows through the parallel passage and through auxiliary control valve (4). The main pump oil flows to the one-way hydraulic attachment through ball valve (6).
The return oil from the attachment flows through ball valve (2) and through ball valve (7). The return oil then enters the hydraulic tank (17).
Main relief valve (14) controls the operating pressure of the work tool.
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| Illustration 6 | g03344211 |
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Two-Way flow to a work tool cylinder (1) Main control valve (2) Ball valve (4) Auxiliary control valve (6) Ball valve (7) Ball valve (for one-way or two-way flow) (9) Pilot control valve (auxiliary) (10) Hydraulic tank (11) Pilot manifold (12) Pilot pump (13) Main pump (14) Main relief valve (15) Work tool cylinder | |
The Two-Way Hydraulic System is for work tools that require two-way hydraulic oil flow. A grapple is a good example.
Note: Ball valve (7) must be put into the CLOSED position (B) during two-way flow operation.
Ball valve (7) controls the path of oil for the two-way hydraulic system. With the lever in CLOSED position (B), a two-way path to the work tool can be achieved. This path will allow return oil and high-pressure oil flow through auxiliary control valve (4) to the work tool.
Pilot pump (12) supplies oil to pilot manifold (11). When the hydraulic activation lever is activated, pilot oil flows from pilot manifold (11) to pilot control valve (9).
When the pilot control valve is pressed down, pilot oil shifts auxiliary control valve (4) up.
Main pump (13) sends oil to the main control valve. The oil flows through the parallel passage and through auxiliary control valve (4). The main pump oil flows to the two-way hydraulic attachment through ball valve (2).
The return oil from the attachment flows through ball valve (6) and back through auxiliary control valve (4). The return oil then flows through the main control valve, the hydraulic oil cooler, and back to hydraulic tank (17). Refer to Illustration 6.
When the pilot control valve is pushed forwards, auxiliary control valve (4) is shifted down. This action sends supply oil through auxiliary control valve (4). The main pump oil flows through ball valve (6) to the head end of work tool cylinder (15). The return oil from the attachment flows through ball valve (2) and back through auxiliary control valve (4). The return oil then flows through main control valve (1), the hydraulic oil cooler, and back to hydraulic tank (17).
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Main relief valve (14) controls the operating pressure of the work tool.