SHOE AS-BRAKE 8E6415 - Caterpillar

Note: Disconnect the transmission output shaft from the equipment drive shaft before initiating the transmission calibration.The clutch calibration fills and drains clutches an number of times in order to compensate for the valve and clutch variablity. The calibration also improves for smooth shifting.A calibration should be performed after every circumstance of:
Transmission to engine mating.
Engine rebuild or turbo swap.
Transmission ECPC valve replacement.
ECU replacement.
Transmission planetary iron disassembly/reassembly/repair.Use the Caterpillar Electronic Technician (Cat ET) in order to perform calibration procedures. Select the “CALIBRATION” option from the Cat ET menu. Follow the instructions that are provided.The ECU must detect the following conditions before starting the calibration procedure:
The transmission oil temperature must be between 70° C (158° F) and 90° C (194° F).
The shift lever is placed in the NEUTRAL position.
The parking brake is applied. (This is only applicable for roading applications.)
Set the engine speed to low idle. The engine will accelerate automatically during the calibration procedure.Fill Calibration
Illustration 1 g01850937The fill calibration function is used in order to optimize the shift quality. This calibration procedure must be performed under the following conditions:
Perform the calibration after replacing or servicing the ECU.
Perform the calibration after the moving of an ECU from one machine to another machine.
Perform the calibration after replacing or servicing any of the transmission solenoid valves.
Perform the calibration after replacing or servicing any of the transmission clutches, seals, pumps, etc.Two parameters are adjusted during the fill calibration, pulse time and hold level. The hold level is calibrated first. The pulse time is calibrated second. The fill calibration for each clutch is completed before the next clutch begins.During the fill calibration, the system software will detect the end of fill cycle for the clutch. The end of the fill cycle is detected by using a drop in converter output speed and a drop in the relative clutch (slip) speed. To effectively detect a drop in converter output speed, a load must be applied to the transmission. This can be accomplished by engaging one of the clutches that is not being calibrated. Hold Level CalibrationThe hold level calibration will determine the touch up pressure that is applied to the clutch pack by the clutch piston. Each clutch command is pulsed and held at the minimum allowable hold level pressure for a specific duration of time. After a 2.0 second pause, the next clutch is pulsed, held, and released. This is repeated until all the clutches have been cycled. The hold level pressure is incremented and the cycle is repeated. The hold level pressure for a clutch is calibrated when the fill cycle is completed and the fill cycle is completed within the specified hold time. The corresponding hold level pressure is the calibrated value. After a clutch has been calibrated, the clutch is taken out of the cycle and a 3.0 second delay is inserted. The delay will allow the clutches that remain in the cycle to drain. This process continues until the hold level pressure reaches the maximum allowable value, or all of the clutches