RESTRICTOR GP-EXHAUST 4P7249 - Caterpillar

Test for the Torque Converter Outlet Pressure
The test will show if engine performance is good. The test will show if the torque converter operates properly. Also, the test will show if there is oil flow through the oil cooler.Note: Any unusual noises during this check should be noted. Loud noises could indicate that repairs are needed.
Start the engine.
Lower the stabilizers and lift the rear wheels about 150 mm (6 inch) off the ground.
Place the bucket hydraulic controls in the lowering position. Lift the front wheels about 150 mm (6 inch) off the ground.
The engine speed needs to be at low idle during these previous steps.
Stop the engine and proceed with the following procedure.
Install the 6V-3121 Multitach on the engine. The multitach can measure engine speed by the use of a photo pickup and reflective tape. The Special Instructions, SEHS7807 has instructions for the use of the multitach.
With the transmission shift lever in (NEUTRAL) position, start the engine and run the engine at low idle. Ensure that high idle rpm and low idle rpm are correct. Refer to Engine supplement, SENR5815, "3054 Engines for Caterpillar Built Machines".
To ensure that the transmission oil does not overheat, do not keep the torque converter in a full stall condition for more than 30 seconds. After the torque converter stall test, reduce the engine speed to low idle. In order to cool the oil, move the transmission control to the NEUTRAL position and run the engine between 1200 rpm and 1500 rpm.
Run the engine at high idle. Fully engage the brakes. Run the transmission at normal operating temperature 59 to 71°C (138 to 160°F). Shift to FOURTH SPEED. Shift the forward/reverse shuttle to FORWARD and stall the torque converter until the converter temperature reaches 90 to 93°C (194 to 200°F). The stall speed should match the chart.Note: The following chart is for the rpm of the torque converter stall. The chart is based on using field fuel. Factory fuel may cause the rpm to be lower than the numbers that are indicated in the chart.
Table 2
Horsepower Rating     Stall RPM    
75 hp     2068 75 RPM    
81 hp     2164 75 RPM    
90 hp     2206 75 RPM    
98 hp     2218 75 RPM    Note: Stall speeds are calculated using No. 2 diesel fuel.
When the test is complete, put the forward/reverse shuttle in NEUTRAL and the shift lever in NEUTRAL. Stop the engine and remove the test equipment.Note: Do not keep the torque converter in a stall condition for very long periods of time. The torque converter, the engine, and the brakes will get hot.ProblemThe oil gets too hot during normal operation.Probable cause
Not enough oil is in the torque converter because the inlet relief valve for the torque converter is open.
The oil pump fails.
The torque converter fails.
The temperature gauge is bad. Replace the temperature gauge and the sending unit.
Debris is blocking the air flow to the oil cooler. Debris could also