SENSOR GP-PRESSURE 4514457 - Caterpillar

Illustration 1 g01273302
Remove filler cap (1) in order to prevent a vacuum in the tank.
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, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: Hand tighten the NPT pipe nipple. Do not use tools.
Remove tank drain plug (2). Install a 88 mm (3.50 inch) long NPT pipe nipple in order to open the internal drain valve. The outer diameter of the NPT pipe nipple should be 25.4 mm (1 inch). Drain the oil into a suitable container.
Illustration 2 g01262829
Remove return line (3).
Remove front cover (4) from the tank.
Clean any debris from the inside of the tank.
Illustration 3 g01262924
Cutaway view
Remove suction screen (5) from the tank.
Wash the suction screen in clean, nonflammable solvent.
Install the clean suction screen.
Remove return screen (6) and properly discard the return screen.
Install a new return screen.
Clean the cover for the front of the hoist/brake tank in clean, nonflammable solvent. Inspect the cover gasket. If the gasket is damaged, replace the gasket.
Install the front cover to the tank.
Install the return line.
Fill the hoist/brake tank. Refer to Operation and Maintenance Manual, "Lubricant Viscosities". Refer to Operation and Maintenance Manual, "Capacities (Refill)".
Start the engine and run the engine for approximately 15 seconds. The oil level will decrease as oil fills the system.
Stop the engine.
Illustration 4 g01273419
Add oil to the tank in order to raise the oil to the proper level in upper sight gauge (7). Refer to Operation and Maintenance Manual, "Hoist and Brake Tank Oil Level - Check" for the proper oil level within the sight gauge.
Start the engine and operate the engine at low idle. Check the hydraulic system for leaks and make necessary repairs.
Raise the dump body until the hoist cylinders are extended halfway. Lower the dump body and add oil, if necessary.
Raise the dump body until the hoist cylinders are fully extended. Lower the dump body and add oil, if necessary.
Repeat Step 19 and Step 20 until the proper oil level stabilizes in the upper sight gauge. Install the filler cap.