CABLE-FRONT 4945209 - Caterpillar

Rotating fan blades can result in personal injury or death.Stop the engine and allow the fan to come to a complete stop before making any test or adjustment.Before starting the engine, make sure all of the finger guards are installed securely. Do not allow any tools or test equipment to protrude or vibrate into the path of the rotating fan blades.
Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine.To prevent personal injury or death, perform the following:Park the machine on a smooth, level surface.Lower the work tool to the ground and engage the parking brake.Stop the engine and remove the key.Block the wheels and install the steering frame lock.
Testing Fan Speed
Table 1
Required Tools    
Part Number     Description     Qty    
9U-7400     Multitach     1    
1U-5481     Pressure Gauge Group     1    
1U-5482     Pressure Adapter Group     1    
In order to check the speed of the fan drive motor, use a 9U-7400 Multitach. The multitach can measure the speed of the fan drive motor by using reflective tape and a photo pickup.Reference: For additional information on the Multitach Group, refer to Special Instruction, NEHS0605, "9U-7400 Multitach II Group and 9U-7402 Multitach II Group".If a piece of reflective tape is already visible on one of the fan blades, proceed to Step 2. If no reflective tape is visible on one of the fan blades, proceed with the following Steps:
Remove two bolts (4). Rotate finger guard assembly (2) away from the fan blades. The finger guard assembly is hinged so the assembly does not need to be removed.
Clean a small area on the surface of one fan blade. Position the tape so that the tape is completely visible. Attach 50.8 mm (2 inches) of 1U-6605 Reflective Tape on the fan blade.
Install bolts (4) and tighten the bolts.
Illustration 1 g00496783
9U-7400 Multitach (1) Photo pickup. (2) Fan guard. (3) Magnetic base. (4) Fan guard bolts. (5) Multitach.
Assemble photo pickup (1) into the clamp on magnetic base (3). Attach magnetic base (3) to the fan guard assembly (2) .
When the reflective tape is aligned with the photo pickup, the LED indicator (red light) should turn on. To check for correct alignment, use a long, narrow object to reach between the fan guards and manually rotate the fan.Note: The speed of the fan drive motor is more critical than the oil pressure.Note: When you start the engine, vibrations and air flow from the fan may cause the photo pickup to become misaligned. It may be necessary to adjust the position of magnetic base (3) in order to align photo pickup (1) .
Start the engine.
Warm the hydraulic oil to normal operating temperature in order to obtain accurate results.
Run the engine at high idle. Record the speed that is shown on multitach (5). The speed of the fan drive motor should be 1140 25 rpm at approximately 14800 kPa (2150 psi).Note: If the machine