SENSOR GP-POS 1854261 - Caterpillar

Steam or hot coolant can cause severe burns.Do not loosen the filler cap or the pressure cap on a hot engine.Allow the engine to cool before removing the filler cap or the pressure cap.
Testing the Filler Cap
Table 1
Tools Needed     Qty    
9S-8140 Pressurizing Pump     1    
Illustration 1 g00986909
(1) Radiator (2) Expansion tank
Illustration 2 g00286374
9S-8140 Pressurizing Pump (3) Release valve (4) 2P-2329 Adapter As (5) Hose
Illustration 3 g00986919
(6) Filler capsThe 9S-8140 Pressurizing Pump is used to test the cooling system for leaks. The pump can also be used to test the filler cap, the pressure relief valve, and the pressure gauge.To check for the amount of pressure that opens the filler cap, use the following procedure:
After the engine cools, carefully loosen the filler cap in order to release the pressure from the cooling system. Remove the filler cap.Note: The expansion tank has two filler caps. The expansion tank has an internal plate that divides the tank into two separate tanks. The large reservoir is for the jacket water cooling system. The small reservoir is for the separate circuit cooling system.
Carefully inspect the filler cap. Look for any damage to the seals and to the sealing surface.Remove any deposits that are found.If the filler cap is damaged, obtain a new cap.
Install the filler cap on the 9S-8140 Pressurizing Pump by using the 2P-2329 Adapter As .The opening pressure for the filler cap's pressure relief valve is stamped on the filler cap.
Apply pressure to the filler cap. Compare the gauge reading with the opening pressure that is listed on the filler cap.If the cap cannot sustain the correct pressure, obtain a new cap.If the filler cap's pressure relief valve does not open within approximately 7 kPa (1 psi) of the pressure that is stamped on the filler cap, obtain a new cap.Testing The Radiator And Cooling System For Leaks
Table 2
Tools Needed     Qty    
9S-8140 Pressurizing Pump     1    Use the following procedure in order to check the cooling system for leaks:
Steam or hot coolant can cause severe burns.Do not loosen the filler cap or the pressure cap on a hot engine.Allow the engine to cool before removing the filler cap or the pressure cap.
After the engine cools, carefully loosen the filler cap in order to release the pressure from the cooling system. Remove the filler cap.
Ensure that there is a sufficient amount of coolant in the expansion tank.
Install the 9S-8140 Pressurizing Pump onto the filler tube.Note: The expansion tank has two filler tubes. The expansion tank has an internal plate that divides the tank into two separate tanks. The large reservoir is for the jacket water cooling system. The small reservoir is for the separate circuit cooling system.
Increase the pressure reading on the gauge to 20 kPa (3 psi) more than the pressure on the filler cap.
Inspect the radiator, all connection points, and the hoses for leaks.If no leaks are found and the gauge reading remains steady for a minimum of five minutes, the cooling system is