BLADE SET- 1U9237 - Caterpillar

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Identify the small rod of the potentiometer at the back of the seat allowing to adjust the overboost pressure.
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Press the overboost button and keep pressed while adjusting potentiometer to obtain a pressure of 540 +/- 5 kPa (78.3 +/- 0.73 psi) on the display. To increase pressure, turn potentiometer rod clockwise.Test - Trailer Brake Joystick Performance
For each specified position of the trailer brake joystick detailed below, compare the pressure on display in the operator cab and reading on the pressure gauge. Difference between the readings should not be over 5 kPa (0.73 psi).Refer to Table 1 for pressure specifications.
Set trailer brake joystick to position 1 and check pressure.Pressure should be 500 +/- 5 kPa (72.5 +/- 0.73 psi).
Press the overboost button on the trailer brake joystick.Pressure should increase to 540 +/- 5 kPa (78.3 +/- 0.73 psi).
Release overboost button.Pressure should drop by 15 kPa (2.2 psi) in 60 to 75 seconds.
Set trailer brake joystick to position 2.Pressure should decrease below 475 kPa (69 psi).
With the joystick still at position 2, press the overboost button.Pressure should not increase and keep steady.
Set trailer brake joystick to position 7.Pressure should decrease to 330 +/- 10 kPa (47.9 +/- 1.5 psi).
Set trailer brake joystick to position 8.Pressure should instantly drop to zero.
Stop the compressor and the engine.If the results were not satisfactory, refer to "Calibration - Sentronic Proportional Pneumatic Valve".Test - UIC Line Leakage
Start the engine.
Start the pneumatic compressor.
Set trailer brake joystick to position 1.
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Isolate the UIC line, shut isolating valve, and push red lever downwards.
Note pressure reading of the display in the operator cab and the pressure in the UIC line using the pressure gauge.
Wait for 10 minutes.
Read the pressure on the display and the pressure gauge. If the pressure dropped more than 20 kPa (2.9 psi), inspect for air pipe leakage.Difference between readings on the display and pressure gauge should be within 5 kPa (0.73 psi). If difference is higher, refer to earlier "Calibrate" section.
Set trailer brake joystick to position 8 or raise left console in the operator cab to release pressure in the UIC line. Open isolating valve and push red lever upwards.
Stop the compressor and stop the engine.
Close the UIC valve.
On UIC line, disconnect the UIC fitting.
Repeat Steps 1 through 11 for the other UIC angle cock on the machine. Connect the UIC fitting on the other UIC pipe.
At the end of test of both UIC lines, disconnect the UIC fitting, minimess, and adaptor and disconnect the pressure sensor.Test - Air Tank Leakage
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Connect tooling group (T1) 3445 kPa (500 psi) to measure pressure in the air tank.
Start the engine.
Start the pneumatic compressor.
For the leak test, air tank must be full with the compressor off. The pressure gauge should read approximately 950 kPa (138 psi) for the air tank.
Turn off the compressor and raise the left armrest.
Stop the engine.
Note the pressure in the air tank on the pressure gauge.
Wait for 10 minutes.
Read the pressure gauge. The pressure should not drop more than 20 kPa (2.9