D8T and D9T Track-Type Tractors – Ripper Does Not Function

Probable Causes

  • Restrictions in oil lines

  • Leaks at fittings and connections of hydraulic lines or hoses

  • Blockage of the main suction hose

Recommended Actions

ReferenceRefer to Testing and Adjusting, KENR8930.

Restrictions In Oil Lines

Blockages, kinks, or restrictions in oil lines in both the supply and return oil lines can prevent oil flow to hydraulic components. Components cannot operate without oil flow from the pump. Components cannot operate properly with reduced flow or pressure available to motors, cylinders, or actuators.

Check for restrictions on all hydraulic oil hoses, lines, and tubes in the system or the circuit in question. Correct any problems that are found then retest the hydraulic system for any symptoms.

Leaks At Fittings And Connections Of Hydraulic Lines or Hoses

Leaks at fittings and other types of hydraulic line connections may cause loss of oil flow. Loss of oil flow may prevent components from attaining pressures necessary to perform work. Pressure losses may generate complaints of weak lift force. Leaks at fittings and connections on the pressure side of pumps are a direct source of oil loss in the system. This oil loss may lead to component failure if the low oil levels are not monitored and 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 damage components via cavitation and create excess or unusual noise.

Check for leaks at all fittings and connections of hydraulic oil hoses, lines, and tubes in the system in question. Correct any problems that are found then retest the hydraulic system for any symptoms.

Blockage of The Main Suction Hose

Blockages or restrictions in the main suction oil line will stop the supply of hydraulic oil flow to the pumps. Components cannot operate without oil flow from the pump. Components cannot operate properly with reduced flow or pressure available to motors, cylinders, or actuators. Correct any problems that are found then retest the hydraulic system for any symptoms.

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