TUBE AS 2621943 - Caterpillar

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Repair or replace broken windows and damaged sealsA window is part of the operator enclosure and is required for proper cab sealing. Some windows are fixed in place, such as the windshield. Other windows are designed to move for ventilation or to communicate to others on the ground. Windows should be free of cracks and holes and should seal well around the perimeter. Repair or replace any windows with holes or cracks.Ensure that zip-in seals are in good condition and properly set. Repair or replace as necessary.If replacing a bonded window, ensure that the bond covers the entire perimeter of the window. The bond should be allowed to cure properly before placing into service. Improper cure could result in changes to the window sealing properties.For a sliding window, the channel should be clear of dirt and debris that may cause window misalignment. Ensure that the latch can hold the window securely in place. Clean the channel and adjust or repair the latch if necessary.
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Open latch (12)
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Make sure that windows are fully latched to get best pressurizationProperly latched (13) For hinged windows, inspect the condition of the perimeter seal. When shut, there should be no gaps between the window, the seal, and the window frame. If displaced or worn, repair or replace as necessary. Ensure that the latch can hold the window securely in place and can be easily operated. Adjust or repair the latch if necessary.Penetration
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Cab penetration (14)
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Plug holes with grommets or caulkGrommet or Caulk (15)
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Hole in boot (16) Cracks in boot (17)
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Inspect rubber bootsSome cabs have penetrations for wiring harnesses, hoses, and so on along with various means to seal the holes ( caulk, grommet, and so on). The penetration holes may be located on the floor or side panels. Inspect the areas and repair or replace the seals as necessary.Exterior Panels
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Panel removed (18)
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Properly reinstall cab componentsAccess panels may be found on the sides and floor of the cab. The panels should be securely in place to provide an airflow path for the conditioned air in some machines.Inspect cab panels for holes or cracks. Repair or replace as necessary.Some panels may have weather stripping, caulk, or a seal around part of the entire perimeter. If so, check that the seal is in good condition and has not been displaced or worn. Repair or replace as necessary.Interior Panels
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Cracked panel (19) Damaged hole (20)
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Properly repair cab panelsCaulked crackPoor sealing access panels inside the cab may also lead to low cab pressure. There may be hidden service access panels under the floor mat, behind the seat, and so on. The poor sealing can be sealed with bulk material with adhesive backing. Skip welds inside the cab structure can be caulked to improve sealing.