SHIELD AS 2A7326 - Caterpillar

This calibration procedure will set the signal limits for the hydraulic fan system. The signal limits are the maximum fan speed and the minimum fan speed. The calibration procedure for Testing and Adjusting the fan speed for the hydraulic fan system, is completed through Cat® Electronic Technician (ET) Service Tool.Testing and Adjusting Fan Speed
Table 1
994K Hydraulic Fan Speeds (1)
High Ambient Max Speed Standard Ambient Max Speed Minimum Fan Speed
Altitude 0° C (32° F) 32° C (90° F) 0° C (32° F) 32° C (90° F) 0° C (32° F) 32° C (90° F)
305 m (1000 ft) 580 rpm 624 rpm 520 rpm 559 rpm 216 rpm 233 rpm
610 m (2000 ft) 591 rpm 636 rpm 529 rpm 570 rpm 221 rpm 237 rpm
914 m (3000 ft) 602 rpm 649 rpm 539 rpm 581 rpm 225 rpm 242 rpm
1219 m (4000 ft) 613 rpm 662 rpm 549 rpm 593 rpm 229 rpm 247 rpm
1524 m (5000 ft) 625 rpm 675 rpm 560 rpm 605 rpm 233 rpm 252 rpm
1829 m (6000 ft) 637 rpm 689 rpm 571 rpm 617 rpm 238 rpm 257 rpm
2134 m (7000 ft) 650 rpm 703 rpm 582 rpm 630 rpm 242 rpm 262 rpm
2438 m (8000 ft) 662 rpm 718 rpm 593 rpm 643 rpm 247 rpm 268 rpm
2743 m (9000 ft) 675 rpm 733 rpm 605 rpm 656 rpm 252 rpm 274 rpm
3048 m (10000 ft) 689 rpm 735 rpm 617 rpm 670 rpm 257 rpm 279 rpm
(1) The hydraulic fan speed calibration setting is a dynamic value based on both altitude and ambient temperature. The table values are for reference only. The actual values will be shown in ET. Fan speeds are based on the ambient temperature and altitude listed.
Connect Cat ET to the machine. The ET connector is on the control panel on the right side of the cab.
Turn the engine start switch to the ON position.
Open the ET software program.
When ET has started, start the engine. Run the engine at high idle. Warm the hydraulic oil to normal operating temperature.
Illustration 1 g06169063
Typical example
Select "General Data". Select "Calibrations" from the "Service" menu. Select "Engine Cooling Fan Calibration".
Illustration 2 g06169059
When the dialog box appears on the screen, read the information in the dialog box. To continue with the calibration procedure, select the "OK" button.
Illustration 3 g06169099
When the dialog box appears on the screen, two checked boxes appear. Select the "Begin" button to start the procedure. The calibration procedure for the minimum fan speed will appear first on the screen.
Illustration 4 g06169087
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) to increase the current. An increase in current will decrease the fan speed. Use decrement button (1) to decrease the current. A decrease in current will increase the fan speed. When the fan speed is within 50 rpm of the desired minimum