CLUTCH ASSEM. 9S9772 - Caterpillar

One cause for a pressure loss from the cooling system can be a damaged seal on the filler cap.To check for the amount of pressure that opens the filler cap, use the following procedure:Required Tools
Table 1
Required Tools Qty
9S-8140 Pressurizing Pump 1 Test Preparation
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.
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. Test Procedure
Note: The opening pressure for the pressure relief valve of the filler cap 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 pressure relief valve of the filler cap does not open within approximately 7 kPa (1 psi) of the pressure that is stamped on the filler cap, obtain a new cap.