| |
| Illustration 1 | g01250388 |
|
Oil filter for 777F series truck (1) Inlet (2) Outlet (3) Oil sampling valve (4) Pressure test port (5) Bypass switch (6) Oil filter for the torque converter lockup clutch | |
| |
| Illustration 2 | g06077542 |
|
Oil filter for 777E series truck (1) Inlet (2) Outlet (5) Bypass switch (6) Oil filter for the torque converter lockup clutch | |
The oil filter for the torque converter lockup clutch (6) is on the left side of the frame assembly behind the front wheel.
The supply section of the gear pump for torque converter lockup sends the oil to the oil filter for the torque converter lockup clutch (6).
Oil flows through inlet passage (1). The oil fills the space between the housing and the element. During normal operation, the oil flows through the element and out outlet passage (2) to the modulating valve for the torque converter lockup clutch and the pilot system for the hoist control. A relief valve for the pilot control pressure limits the maximum pressure of this supply oil. During normal operation, the element stops any debris that is in the oil.
If the element becomes full of debris, the restriction to the flow of oil cause a pressure increase inside the housing. The pressurized oil activates bypass switch (5) and an alarm is registered in the cab.
The oil then flows past the open bypass valve and to the modulating valve for the torque converter lockup clutch and the pilot system for the hoist control valve. When the oil does not flow through the element, the debris in the oil will damage other components in the lockup clutch for the torque converter and the pilot system for the hoist control valve.
Use correct maintenance to make sure that the element does not become full of debris. If the element is full of debris, the flow of clean oil to the lockup clutch for the torque converter and the pilot system for the hoist control valve is stopped.