Inspection of the Air Cleaner

49X mm 09.01.001

Restriction of air flow through the air cleaner element is measured at the tap in the air cleaner outlet. Check the restriction indicator at the air cleaner or in the cab if the vehicle is equipped with a dash-mounted restriction gauge.

Vehicles may be equipped with either a manual-reset restriction indicator with graduations Fig. or a go/no-go restriction indicator without graduations Fig..

Fig. 1, Manual-Reset Air Restriction Indicator, Graduated

Fig. 2, Manual-Reset Air Restriction Indicator, Go/No-Go

    Notice: Do not use aftermarket air-cleaner elements. Aftermarket air-cleaner elements may not seal the housing correctly, which can lead to engine damage and potentially the loss of warranty. When replacing an air-cleaner element, use only the part listed in PartsPro for the serial number of the vehicle.

  1. Inspect the air restriction indicator to see if air restriction equals or exceeds the maximum allowable restriction. For instructions, see  of the Western Star 47X and 49X Workshop Manual.

    2. Notice: Do not use aftermarket air-cleaner elements. Aftermarket air-cleaner elements may not seal the housing correctly, which can lead to engine damage and potentially the loss of warranty. When replacing an air-cleaner element, use only the part listed in PartsPro for the serial number of the vehicle.

  2. If necessary, replace the air cleaner element. For air cleaner element replacement instructions.
  3. Inspect the air cleaner housing for cracks, leaks, or any other damage. If the air cleaner housing or element is damaged, replace it.
  4. Inspect the forward and rear mounting isolators for damage. See Fig.. Ensure the bonds between the rubber and the steel plates are completely intact. See Fig.. If a mounting isolator is damaged, replace it. For isolator replacement instructions, see of the Western Star 47X and 49X Workshop Manual.

    1. Air Cleaner Housing

    2. Nut

    3. Forward Mounting Isolator

    4. Aft Mounting Isolator

    5. Aft Mounting Bracket

    6. Clamp

    7. Intake Duct

    8. Clamp

    Fig. 3, Air Cleaner Assembly

    1. Steel Plate

    2. Rubber

    Fig. 4, Mounting Isolator

  5. Check that the quick connect fitting for the air compressor supply line is fully engaged with the air cleaner. See Fig..

    • Check this connection.

    1. Air Cleaner

    2. Resonator

    3. Compressor Supply Line

    Fig. 5, Compressor Supply Line Quick Connect

  6. The optional hood mounted pre-separators are designed to be maintenance free. If the vehicle experiences the following conditions, the pre-separators should be removed, disassembled, and if required, cleaned;
    1. Exposure to highly dusty conditions a on regular basis.
    2. Shorter than expected filter intervals.
  7. Reset the air restriction indicator.
  8. Each time the air cleaner housing is replaced, perform the procedures in MOP 13–01
Note:
Parent topic: Air Cleaner Inspection
Document Number: 0000118182
Manual Publication Date: 2024-05-16
Topic Publication Date: 2024-10-31