HARNESS AS-ENGINE 7W7659 - Caterpillar

Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine.To prevent personal injury or death, perform the following:Park the machine on a smooth, level surface.Lower the work tool to the ground and engage the parking brake.Stop the engine and remove the key.Block the wheels and install the steering frame lock.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g06337950
Brake accumulator charging valve
(1) Brake, pilot, fan pump backup relief valve
Table 1
Brake, Pilot, Fan Pump Backup Relief Valve
Pressure Setting 23000 345 kPa (3335.92000 50.03880 psi) @ 1 L/min (0.26 US gpm) Brake, pilot, fan pump backup relief valve (1) is on the brake accumulator charging valve. Brake, pilot, fan pump backup relief valve relieves pressure in the brake, pilot, fan pump backup circuit. The line relief valve protects components of the brake, pilot, fan pump circuit from high pressure. External loads on the system may cause these high pressures.A hydraulic test bench is the most accurate method for testing line relief valves. If testing cannot be safely performed on a test bench, it is recommended to replace the component.