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| Illustration 1 | g06349142 |
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(1) Cooler inlet
(2) Oil cooler (3) Vertical hose (4) Hose from fan (5) Hose to tank (6) Hose from pump (7) Thermal bypass valve | |
Hydraulic oil cooler (2) cools the oil that exits the hydraulic fan motor. To prevent overcooling, thermal bypass valve (7) allows oil to bypass the hydraulic oil cooler until the oil warms.
Return oil from the demand fan enters thermal bypass valve through hose from fan (4). When the oil is cold, thermal bypass valve (7) remains open. The oil passes through hose to tank (5) and returns to the tank. When the oil is warm, thermal bypass valve (7) closes against the seat. This forces the oil through the hydraulic oil cooler through vertical hose (3). The oil then flows through hose to tank (5).
The hydraulic oil cooler receives oil from the fan motor through inlet (1). The oil flows through hydraulic oil cooler (2) and the oil exits through hose to tank (5). The oil then flows to the tank.
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| Illustration 2 | g06349179 |
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(2) Oil cooler
(5) Hose to tank (7) Thermal bypass valve (8) Fan drive pump (9) Fan drive motor (GG) Tank oil (KK) High pressure | |
Return oil from fan drive motor (9) enters thermal bypass valve (7). When the preset temperature is reached, thermal bypass valve (7) will prevent the hydraulic oil from passing directly through the valve. The hydraulic oil is then diverted through oil cooler (2).