CYLINDER HEAD GP 2657840 - Caterpillar

Illustration 4 g00911104
(1) Piston. (2) Friction disc. (3) Pin. (6) Cup. (7) Flange face for the axle housing. (8) Depth micrometer. (9) Gauge block. (C) Dimension that is used to determine the amount of service life of a brake disc. (D) Thickness of gauge block (9) . (E) Total distance of the depth micrometer.
Apply light pressure to pin (3) in order to ensure that pin (3) is seated against cup (6) .
Measure dimension (C) with the service brakes in the APPLIED position. Dimension (C) equals the distance from the flange face for axle housing (7) to the end of pin (3) . Use a depth micrometer and the tools in Table 1 to measure dimension (C) .
Use a caliper or a similar tool to determine the exact thickness (D) of gauge block (9) .
Gauge block (9) is in the shape of the letter "U". Position gauge block (9) so that the slot straddles the hole in flange face (7) . Firmly hold gauge block (9) against flange face (7) .
Measure dimension (E) .
To determine the value of dimension (C) , subtract the value of dimension (D) from the value of dimension (E) .Note: If gauge block (9) is not available, use a depth micrometer with a half of a base to measure dimension (C) directly from flange face (7) . Shorten the base on the micrometer by grinding. This will help allow the base of the micrometer to rest on flange face (7) .Note: The baseline values for dimension (C) of the four service brakes was originally measured at the factory when the machine was new. The baseline values for dimension (C) are stored electronically on the machine's transmission electronic control module (ECM). Use the Caterpillar electronic technician (ET) in order to retrieve the baseline value of dimension (C) .
In order to retrieve the baseline values, perform the steps that follow.
Stop the engine.
Illustration 5 g00940223
Location of the Diagnostic Connector (10) Diagnostic connector (ET).
Connect ET to diagnostic connector (10) .
Turn the engine start switch key to the ON position, but do not start the engine.
Illustration 6 g00328764
Start the ET software and select "Transmission 950" under the heading "Available ECMs".
Select the "Configuration Tool" icon.
Illustration 7 g00328765
Note: Record each value of dimension (C) on a piece of paper. The values that are shown on the screen are the baseline values for each of the four service brakes. The "Brk Meas Hourmeter" value is the reading on the service meter unit (SMU). The SMU reading was recorded when new brake discs were installed on the machine.Note: Do not modify the baseline value or the "Brk Meas Hourmeter" values that are stored in the transmission ECM. Change these values only when you install a new brake disc.
Exit from the ET software.
Turn the engine start switch key to the OFF position.
Disconnect ET from diagnostic connector (10) .
Determine the amount of service life that is available for the left front service brake disc. Write down the value of dimension (C) for the left front service brake. This value was