| (13) Case drain filters(21) Hydraulic tank |
Internal leakage from steering piston pump (14) is returned to hydraulic tank (21) through case drain filters (13). Case drain filters (13) are located between hydraulic tank (21) and the front brake oil coolers. Return oil from the steering system flows through steering filter (18). Steering filter (18) is located between the steering solenoid and relief valve (23) and hydraulic oil cooler (16). Normally, oil flows through these filters and clean oil is returned to hydraulic tank (21). Case drain filters (13) and steering filter (18) will trap any debris that is present in the oil.
If any filter element becomes full of debris, the restriction to flow causes a pressure increase. Each of the filters has a bypass valve. The bypass valve will open when the pressure increases to the bypass pressure. When the bypass valve opens, oil is allowed to bypass the filter element. The oil goes directly to hydraulic tank (21). When the oil bypasses the filter element, debris in the oil can damage other system components. Proper maintenance must be used to ensure that the filter element does not stop the flow of clean oil to the hydraulic system.
| View of the standard hydraulic tank (1) Hydraulic tank for the shallow brake arrangement (A) Steering and hydraulic fan section (B) Hoist and brake cooling section(C) Section for the brake and rear axle lubrication |
Hydraulic tank (1) for the shallow brake arrangement for the 797F is located on the outside of the right side of the frame. Hydraulic tank (1) has three sections.
| View of the Hydraulic tank for the shallow brake arrangement (1) Hydraulic tank (2) Fill port for the steering tank (3) Sight gauge (4) Breather port for the hydraulic tank (5) Return port for the rear brake cooling (6) Sight gauge (7) Fast fill for the hydraulic tank (8) Return port for the brake pump (9) Top off return port for the brake and rear axle lubrication (10) Return port for the brake and rear axle (11) Suction port for the brake and rear axle (12) Drain port for the brake tank (13) Sight gauge (14) Return port for the relief for the brake cooling (15) Sight gauge(16) Sight gauge |
Fill port (2) is for steering section (A) of hydraulic tank (1). Fill port (7) is for section (B) and section (C) of hydraulic tank (1). Section (C) supplies the oil for brake actuation and for the rear axle lubrication. Section (C) is an internal tank that is used to keep the brake actuation oil free of contaminants that return with the brake cooling oil. Steering section (A) for hydraulic tank (1) contains oil for the steering system and the piston pump that drives the fan drive motor. An air breather for hydraulic tank (1) is located on the vertical frame member on the right side of the truck.
Hydraulic tank (1) has five sight gauges. All of the sight gauges are located on the front of hydraulic tank (1). Sight gauge (3) and sight gauge (13) are for the hoist and brake cooling section (B) of hydraulic tank (1). Sight gauge (15) and sight gauge (16) are for the steering and hydraulic fan section (A) of hydraulic tank (1). Sight gauge (6) is for section (C) of hydraulic tank (1) .
The oil level in the sight gauges will drop when the engine is operating and the accumulators are fully charged. Refer to Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for lubrication viscosities and for refill capacities for the hydraulic tank.
| View of the standard hydraulic tank (17) Return ports for the front brake cooling (18) Return port for the hoist (19) Suction port for the steering and fan drive (20) Return port for the fan, brake cooling, and steering (21) Port for the fast fill warm switch (22) Port for the fast fill cold switch (23) Breather port for the steering tank (24) Port for the level switch for the fast fill dead engine (25) Port for the level sensor for steering (26) Port for the steering oil temperature sensor (27) Suction port for the secondary steering (28) Ecology drain for the steering tank (29) Suction port for the pump drive for the brake cooling (30) Fast fill port for the steering tank (31) Ecology drain for the hydraulic tank (32) Ports for the case drain (33) Suction ports for the brake cooling(34) Suction port for the hoist |
| View of the standard hydraulic tank(35) Brake cooling relief valves |
The oil coolers are protected from high pressure by relief valves (35) .
Hydraulic Tank (Brake, Hoist, Steering)
Extra Retarding
| (1) Hydraulic tank (A) Steering and hydraulic fan section (B) Hoist and brake cooling section(C) Section for the brake and rear axle lubrication |
Hydraulic tank (1) for the steep brake arrangement for the 797F is located on the outside of the right side of the frame. Hydraulic tank (1) has three sections.
| (2) Fill port for the steering tank (3) Sight gauge for the hoist and brake cooling section of the hydraulic tank (4) Return ports for the brake cooling (5) Breather port for the hydraulic tank (6) Fill port for the hoist and brake tank (7) Sight gauge for the brake tank (8) Fast fill port for the hydraulic tank (9) Return port for the brake pump (10) Top off return port for the brake and rear axle (11) Return port for the brake and rear axle (12) Suction port for the brake and rear axle (13) Drain port for the brake tank (14) Sight gauge for the hoist and brake cooling section of the hydraulic tank (15) Piston motor (brake cooling) (16) Brake cooling screens (17) Sight gauge for the steering section of the hydraulic tank(18) Sight gauge for the steering section of the hydraulic tank |
Fill port (2) is for steering section (A) of hydraulic tank (1). Fill port (6) is for section (B) and section (C) of hydraulic tank (1). Section (C) supplies the oil for brake actuation and for the rear axle lubrication. Section (C) is an internal tank that is used to keep the brake actuation oil free of contaminants that return with the brake cooling oil. Steering section (A) for hydraulic tank (1) contains oil for the steering system and the piston pump that drives the fan drive motor. An air breather for hydraulic tank (1) is located on the vertical frame member on the right side of the truck.
Hydraulic tank (1) has five sight gauges. All of the sight gauges are located on the front of hydraulic tank (1). Sight gauge (3) and sight gauge (14) are for the hoist and brake cooling section (B) of hydraulic tank (1). Sight gauge (17) and sight gauge (18) are for the steering and hydraulic fan section (A) of hydraulic tank (1). Sight gauge (7) is for section (C) of hydraulic tank (1) .
The oil level in the sight gauges will drop when the engine is operating and the accumulators are fully charged. Refer to Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for lubrication viscosities and for refill capacities for the hydraulic tank.
| (19) Suction port for the hoist (20) Return port for the hoist (21) Suction port for the steering and fan drive (22) Return port for the fan, brake cooling, and steering (23) Port for the fast fill full warm switch (24) Port for the fast fill full cold switch (25) Breather port for the steering tank (26) Port for the level switch for the fast fill dead engine (27) Port for the level sensor for the steering (28) Port for the steering oil temperature sensor (29) Suction port for the secondary steering (30) Ecology drain for the steering tank (31) Suction port for the pump drive for brake cooling (32) Ecology drain for the hydraulic tank (33) Port for the fast fill steering tank(34) Ports for the case drain |
| (15) Piston motor (brake cooling) (16) Brake cooling screens (35) Suction port for the rear brake cooling(36) Suction port for the front brake cooling |
| (15) Piston motor (brake cooling) (16) Brake cooling screens(37) Brake cooling relief valves |
Piston motor (15) drives three brake cooling pump sections that are located inside hydraulic tank (1) .
The oil coolers are protected from high pressure by relief valves (37) .
MARYGAR
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