MOUNT-FLEXIBLE 7C6121 - Caterpillar

Machine Preparation
Move the machine to a smooth horizontal location. Move away from working machines and personnel. Lower the work tools to the ground.
Only allow one operator on the machine. Keep all personnel away from the machine or in the view of the operator.
Engage the parking brake.
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Place the steering frame lock in the LOCKED position.
Use the 9U-7402 Multitach Tool Gp in order to check the speed of the hydraulic fan. The multitach measures the speed of the hydraulic fan by using reflective tape and a photo pickup.Reference: Special Instruction, NEHS0605, "Tool Operating Manual (9U-7400 Multitach II Group, 9U-7401 Multitach II, 9U-7402 Multitach Photo Group)".Note: If a piece of reflective tape is already visible on one of the fan blades, proceed to Step 6. If no reflective tape is visible on one of the fan blades, use the following procedure:
Turn the engine start switch to the OFF position.
Ensure that the engine start switch is in the OFF position.
Remove the rear grill.
Clean a small area on the surface of one fan blade near the edge. Position the 1U-6605 Reflective Tape so that the entire piece of tape is visible. Place the tape near the edge of the blade.
Install the rear grill.
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Photo pickup and magnetic base on the fan guard (typical example)
Place photo pickup into the holder on the magnetic base. Tighten the screw. Attach the magnetic base to the fan guard assembly. Refer to Illustration 2.
When the reflective tape and the photo pickup are in alignment, the LED indicator (red light) will come on. Position the photo pickup accordingly.Note: When you start the engine, vibration of the machine may cause the photo pickup to become misaligned. Adjustment of the magnetic base may be necessary in order to realign the photo pickup.Testing and Adjusting Fan Speed
ConnectCat® ET to the machine. The Cat® ET connector is located on the control panel on the right side of the cab.
Turn the engine start switch to the ON position.
Open the Cat® ET software program.
When Cat® ET has started, start the engine. Run the engine at high idle. Warm the hydraulic oil to normal operating temperature.
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Select "General Data" under "992K". Select "Calibrations" from the "Service" menu. Select "Engine Cooling Fan Calibration".
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When the dialog box appears on the screen, read the information in the dialog box. In order to continue with the calibration procedure, select the "OK" button.
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When the dialog box appears on the screen, two checked boxes appear. Select the "Begin" button in order to start the procedure. The calibration procedure for the minimum fan speed will appear first on the screen.
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In order to begin the test for the minimum fan speed, select the "Next" button. Follow the directions that are on the screen. After the first box has been checked, monitor the multitach for the fan speed. Use increment button (2) in order to increase the current. An increase