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AIR SYSTEM

  • A.

    When LOW RANGE is selected, a steady blast of air will flow from opened port. Select HIGH RANGE to shut off air flow. This indicates the control valve is operating properly. Reconnect air line.

  • B.

    If control valve does not operate properly, check for restrictions and air leaks. Leaks in- dicate defective or worn O-rings.

  • 5.

    HIGH RANGE OPERATION With the gear shift lever in neutral, select LOW RANGE and disconnect the 1/4” I.D. air line at the port of range cylinder cover. Make sure this line leads from the High Range or “H” Port of slave valve.

    • A.

      When HIGH RANGE is selected, a steady blast of air should flow from disconnected line. Select LOW RANGE to shut off air flow.

    • B.

      Move the shift lever to a gear position and se- lect HIGH RANGE. There should be NO AIR flowing from disconnected line. Return the gear shift lever to the neutral position. There should now be a steady flow of air from dis- connected line. Select LOW RANGE to shut off air flow and reconnect air line.

    • C.

      If the air system does not operate accord- ingly, the slave valve or actuating components of the shift bar housing assembly are defec- tive.

IMPORTANT: RANGE PRESELECTION The plunger pin, located in case bore between the slave valve and actuating plunger of shift bar housing, prevents the slave valve from operating while the shift lever is in a gear position. When the lever is moved to or through the neutral po- sition, the pin is released and the salve valve be- comes operational.

  • 6.

    LOW RANGE OPERATION With the gear shift lever in neutral, select HIGH RANGE and disconnect the 1/4” I.D. air line at the fitting on range cylinder housing. Make sure this line leads from the Low Range or “L” Port of slave valve.

    • A.

      When LOW RANGE is selected, a steady blast of air should flow from disconnected line. Se- lect HIGH RANGE to shut off air flow.

    • B.

      Move the shift lever to a gear position and se- lect LOW RANGE. There should be NO AIR flowing from disconnected line. Return the gear shift lever to the neutral position. There should now be a steady flow of air from dis- connected line. Select HIGH RANGE to shut off air flow and reconnect air line.

    • C.

      If the air system does not operate accord- ingly, the slave valve or actuating components of the shift bar housing assembly are defec- tive.

  • 7.

    RANGE CYLINDER (Refer to the following illustration.)

If any of the seals in the range cylinder assembly are defective, the range shift will be affected.

  • A.

    Leak at either O-ring A results in complete failure to make a range shift; steady flow of air from breather of slave valve in both ranges.

  • B.

    Leak at gasket B results in a steady flow of air to atmosphere while in HIGH RANGE.

  • C.

    Leak at O-ring C results in a slow shift to LOW RANGE; pressurizing of transmission case.

Cut 7420-4/84

Range Cylinder Assembly—All Models

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