PRECLEANER AS 2645859 - Caterpillar

Illustration 2 g00799694
Side View of the Radiator Group
Ensure that the key start switch is in the OFF position. Access to the fan blade is through door (1) on either side of the radiator group.
Clean a small area on the surface of one fan blade. Position the reflective tape so that the tape is completely visible. Then attach a piece of the reflective tape to the fan blade.
Illustration 3 g00815885
Place photo pickup (2) into the holder on magnetic base (3) and tighten the screw. Attach magnetic base (3) to the fan guard assembly.
When the reflective tape and photo pickup (2) are in alignment, the LED indicator (red light) will come on. Position photo pickup (1) accordingly.Note: When you start the engine, vibration of the machine may cause the photo pickup to become misaligned. It may be necessary to adjust the position of magnetic base (3) in order to realign photo pickup (2) .Testing and Adjusting Fan Speed
Table 2
Hydraulic Fan Speeds (1)    
Machine     Fan speed     Engine Speed    
980G II     500 + 75 - 25 rpm     800 20 rpm    
( 1 ) The fan speed is at low idle. The solenoid valve is connected.
Table 3
Hydraulic Fan Speeds (1)    
Machine     Fan speed     Engine Speed    
980G II     1250 25 rpm     2200 50 rpm    
( 1 ) The hydraulic fan speed is at high idle. The electrohydraulic valve is disconnected.
Start the engine. Run the engine at high idle. Move the control levers in all directions in order to warm the hydraulic oil to normal operating temperature 49 to 65°C (120 to 150°F).Note: In order to check the fan speed at low idle, the following conditions must be met:
The engine coolant must be less than 89 °C (192 °F).
The temperature of the air inlet manifold must be less than 50 °C (122 °F).
The lube oil temperature for the transmission must be less than 93 °C (199 °F).
The temperature of the hydraulic oil sump must be less than 90 °C (194 °F).
Run the engine at low idle. Observe the multitach (4) and record the hydraulic fan speed.Refer to Table 2 for the hydraulic fan speed and the engine speed for the machine that is being serviced.
Illustration 4 g00799925
Hydraulic Fan Pump
If the fan speed is not within the specifications, adjust the minimum fan speed. Use the adjusting screw (5) on the hydraulic fan pump in order to adjust the minimum fan speed. Torque for the locknut is 21 2 N m (15 1.5 lb ft).
If any adjustments are made to the hydraulic fan system, repeat Step 1 through Step 3 until the minimum fan speed is properly adjusted.
Illustration 5 g00799930
Solenoid Valve (Demand Fan)
The solenoid control valve (demand fan) is located on the right side of the engine and below the hydraulic fan pump. Turn the key start switch to the OFF position. Disconnect the electrical connection from the connection (7) on the solenoid valve.Note: Removing the connector from the solenoid valve will