PLATE 5381421 - Caterpillar

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Engine Cooling Fan Minimum Speed Calibrations
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Engine Cooling Fan Maximum Speed Calibrations
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Engine Cooling Fan Nominal Speed CalibrationsTest and Adjustment for the Fan Reversing Relief Valve
Note: The fan reversing relief valve cannot be adjusted on the machine. The fan reversing relief valve has a setting that is higher than the maximum mechanical high-pressure setting and must be set at a corresponding flow rate. Use the following procedure to test and adjust this valve.Bench Test
Table 2
Required Tools
Part Number Description Quantity
257-5616 Test Manifold Block 1
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Remove the relief valves (7) and (8) from the reversing valve.
Use the 257-5616 Test Manifold Block to test the fan reversing relief valves (7) and (8) on the test bench. Torque relief valves to 53 3 N m (39 2 lb ft).Note: The pressure setting for the valve (7) is 23500 345 kPa (3408 50 psi). The pressure setting for the valve (8) is 23500 138 kPa (3408 20 psi).The pressures are under the following conditions:
SAE 10W hydraulic oil
65°C (150°F)
Flow rate at valve (7) is 4 L/min (1.10 US gpm)
Flow rate at valve (8) is 7.6 L/min (2.01 US gpm)
If the fan reversing relief valves are not within the specifications, use the adjustment screw (9) to change the pressure setting until the specifications are met.
Hold adjustment screw (10) in place and loosen locknut (9).
Turn adjustment screw (10) clockwise to increase the pressure setting or turn adjustment screw (10) counterclockwise to decrease the pressure setting.
Hold adjustment screw (10) in place and tighten locknut (9).
Check the pressure.Note: When the pressure setting is within the specified limit, install relief valves (7) and (8) into reversing valve. Torque the relief valves to 53 3 N m (39 2 lb ft).Worksheet
Table 3
D11T Test For the Hydraulic Fan System
Date Equipment
Item Specification Actual
Maximum Pump Pressure 22300 500 kPa (3234 73 psi)
Minimum Pump Pressure 4000 200 kPa (580 30 psi)
Engine speed HIGH IDLE
Maximum Fan Speed 1050 RPM to 1200 RPM
Minimum Fan Speed 300 RPM to 700 RPM
Clip Speed 1868 40 km/h (1160 25 mph)(1)
Fan Reversing Valve Pressure 23500 345 kPa (3408 50 psi)
Fan Reversing Valve Pressure 23500 138 kPa (3408 20 psi)
Fan Reversing Valve Torque 53 3 N m (39 2 lb ft)
(1) The clip speed may be different due to the ambient temperature and atmospheric pressure. The clip speed is corrected within Electronic Technician (ET).