D6T XE Electrical & Hydraulic Troubleshooting Hydraulic Fan Does Not Function Caterpillar


Hydraulic Fan Does Not Function
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D6T XE Electrical & Hydraulic Troubleshooting [M0070102]
COOLING SYSTEM
D6T XE Electrical & Hydraulic Troubleshooting Hydraulic Fan Does Not Function
D6T XE Electrical & Hydraulic Troubleshooting Hydraulic Fan Does Not Shut Off
1.1. Probable Causes
2.1. Recommended Actions
3.2. Blockages, Restrictions, Or Kinks In Hoses And Lines, Or Smashed/Dented Tubes
4.2. Leaks At Fittings And Connections Of Hydraulic Lines/Hoses
5.2. Fan Motor Stuck At Zero Speed Position
6.2. Fan Motor Solenoid Stuck

------ WARNING! ------

Personal injury or death can result from escaping fluid under pressure.

Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.

Always use a board or cardboard when checking for a leak.


Probable Causes

  • Blockages, restrictions, or kinks in hoses and lines, or smashed/dented tubes.

  • Leaks at fittings and connections of hydraulic lines/hoses.

  • Fan motor stuck at zero speed position

  • Fan motor solenoid stuck

Recommended Actions

Note: Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. You must be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component that contains fluid. Dispose of all fluids according to local regulations.

Ensure that the fan motor is not seized or mechanically damaged.

Blockages, Restrictions, Or Kinks In Hoses And Lines, Or Smashed/Dented Tubes

Check for blockages, kinks, or restrictions in both the supply and return oil lines that may prevent oil flow to the hydraulic components. Hydraulic components cannot operate without oil flow from the pump. Hydraulic components cannot operate properly with reduced flow or pressure available to motors, cylinders, actuators, etc. Correct any problems that are found, then retest the system. Kinks or restrictions in hydraulic lines and hoses also act as an orifice, creating excessive noise and heat as high-pressure oil is forced through a passage that is smaller than the original design.

Leaks At Fittings And Connections Of Hydraulic Lines/Hoses

Check for leaks at all fittings and connections of hydraulic oil hoses/lines/tubes in the hydraulic fan system. Leaks at fittings and other types of hydraulic line connections may cause loss of oil flow and prevent components from attaining pressures necessary to perform work. Flow losses generate complaints of component speed (fan speed or cylinder speed).

Leaks at fittings and connections on the pressure side of pumps are a direct source of oil loss in the system. Oil loss in the system may lead to component failure if the pumps and motors are starved of oil. Leaks at fittings and connections on the suction side of pumps are a direct source of oil aeration. Oil aeration may also cause damage to components via cavitation and may create excess or unusual noise.

Fan Motor Stuck At Zero Speed Position

Use the controls in the cab to cause a fan reverse cycle.

Stop the engine by turning the key switch to the OFF position. Allow the regeneration to complete (if necessary). Restart the engine.

If the problem is not corrected, inspect or replace the fan motor.

Fan Motor Solenoid Stuck

Remove and inspect the fan motor control solenoid for debris.

Reinstall and test the fan motor control solenoid.

Replace the fan motor control solenoid (if required).

If the problem is not corrected, inspect or replace the fan motor.

Correct any problems found, then retest for the symptom(s).

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