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| Illustration 1 | g00530818 |
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(1) Front brake cooling hydraulic filters
(2) Bypass switch (3) Inlet passage (4) Outlet passage | |
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| Illustration 2 | g00530817 |
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(3) Inlet passage
(4) Outlet passage (5) Bypass valve (6) Spring (7) Screen (8) Element (9) Housing | |
Oil from the hydraulic oil tank flows to the oil pump. The parking brake release section of the pump sends oil to the parking and secondary brake valve. If the relief valve is open, the bypass oil flows to front brake cooling hydraulic filters (1). The front brake cooling hydraulic filters (1) also receive oil from the hoist control valve.
Oil flows through inlet passage (3). The oil fills the space between the inside of housing (9) and screen (7). During normal operation, the oil flows through screen (7) and element (8). The oil flows out of outlet passage (4) to the remainder of the hydraulic system. Screen (7) and element (8) stop any debris that is in the oil.
If filter screen (7) and element (8) becomes full of debris, the restriction to the flow of oil causes a pressure increase inside the filter. The pressure oil causes bypass valve (6) to move against the force of spring (5). Also, bypass switch (2) will be activated and an alarm will be registered in the cab.
The oil then flows past the open bypass valve and to the remainder of the hydraulic system. When the oil does not flow through the filter screen and the element, the debris in the oil will cause damage to other components in the hydraulic system.
Use correct maintenance in order to make sure that screen (7) and element (8) do not become full of debris. If screen (7) and element (8) are full of debris, the flow of clean oil to the hydraulic system is stopped.