SPRING 4610031 - Caterpillar

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the power train.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
Table 1
Required Tools    
Part Number     Description     Quantity    
9U-7400     Multitach     1    The converter stall test is a test of the engine, torque converter, drive train, and brake system as a unit. The converter output stalls with the engine at full throttle. This test will give you an indication if the engine and transmission performance is acceptable under full load. An engine speed that is lower than the normal or an engine speed that is higher than the normal indicate engine problems or transmission problems. When the performance of the engine is correct, but the stall speed is not correct, the problem is in the converter or the problem is in the transmission.The drive wheels must not turn during the stall test. Put the machine in position against a solid object that will not move. Engage the parking brake. When tests are made, the service brakes must be applied.
Install the 9U-7400 Multitach Tool Group on the engine. The 9U-7400 Multitach Tool Group can measure engine rpm by the use of the photo pickup and the reflective tape.
Start the engine. Make sure that the transmission oil is at normal operating temperature. The normal operating temperature of the transmission oil is 82° to 93°C (180° to 200°F).
Release the parking brake.
Apply the service brakes.Note: To make sure that the transmission oil does not get too hot, do not keep the torque converter in a full stall condition for more than 30 seconds. After the torque converter stalls, put the control in NEUTRAL. Run the engine at 1200 to 1500 rpm in order to cool the oil.
Ensure that the transmission neutralizer override is enabled. The transmission neutralizer override is enabled when the transmission neutralizer override switch is illuminated.
Put the transmission control lever in fourth speed FORWARD. Push down the accelerator pedal completely. Allow the engine rpm to stabilize and take a reading from the tachometer.
The correct stall speed for the 924G and 924Gz is 2225 125 rpm.The correct stall speed for the 928G and IT28G is 2200 125 rpm.A stall speed that is low indicates that the engine performance is not correct. Wait at least two minutes with the transmission in NEUTRAL before repeating the test.