VALVE GP-MANUAL 3652875 - Caterpillar

Table 1
Tools Needed     Quantity    
9S-8140 Pressurizing Pump     1    
Illustration 1 g00286371
Typical pressure relief valve system (1) Pressure relief valve (2) Stud for filler cap
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.
Use the following procedure to check the pressure in the cooling system:
After the engine is cool, loosen the filler cap slowly and allow pressure out of the cooling system. Then remove the filler cap from the radiator.
Inspect the filler cap carefully. Look for damage to the seal or to the surface that seals. Any foreign material or deposits on the cap must be removed. Any foreign material or deposits on the seal must be removed. Any foreign material or deposits on the surface that seals must be removed.
Make sure that the coolant level is above the top of the radiator core.
Install the filler cap. Tighten the filler cap.
Illustration 2 g00286374
9S-8140 Pressurizing Pump (3) Release valve (4) Adapter (5) Hose
Remove hose (5) from adapter (4) .
Remove the pressure test plug for the radiator top tank.
Illustration 3 g00286375
Install the end of the hose (5) in the hole for the pressure test plug.
Operate the pump until the pointer on the pressure indicator does not increase. The highest pressure indication on the pressure indicator is the point that opens the relief valve. The open pressure is approximately 124 kPa (18 psi).
If the relief valve does not open within the pressure specification, replacement of the relief valve is necessary.
If the relief valve is within specifications, check the radiator for outside leakage.
Check all connections and hoses of the cooling system for outside leakage.
The radiator and the cooling system do not leak if the following conditions exist. There is no outside leakage. The pressure reading on the pressure indicator stays same after five minutes. If the reading on the pressure indicator goes down and no outside leak is visible, the inside of the cooling system is leaking. Make the necessary repairs.
Personal injury can result from escaping fluid under pressure.If a pressure indication is shown on the indicator, push the release valve in order to relieve pressure before removing any hose from the radiator.
Remove hose (5) from the pressure test location on the radiator.
Install the plug in the pressure test location.