2025 Blue Bird Vision Transit Bus TSBs
7 Technical Service Bulletins across 3 categories
Categories
Transmission
3 bulletinsBlue Bird has identified a software issue affecting the Neutral-at-Stop feature.
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A software update is required in-person at an authorized Allison Transmission Dealer.
The 7.3L radiator uses adapter nuts, if not properly sealed, exposes the opportunity for fluid migration through threads.
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Primary failure seen is deterioration of the EPDM gasket sealing the transmission oil cooler (TOC) to lower radiator tank, which allows a path for coolant to leak externally. Secondary failure seen is cross contamination between coolant and transmission oil. To eliminate the possibility of experiencing this condition, Blue Bird is providing 1 year of coverage to update the transmission oil cooler interface along with a visual inspection of any cross contamination at time of completing the interface update. Please follow the flowchart within the instructions to determine if any additional repair activity is necessary and, if so, complete further repair procedures as stated.
SM2401: 7.3L / 6R140 Fluid Cross Contamination Issue: Coolant and Transmission Fluid Cross Contamination Corrective...
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Action: Outline in the SM2401 Service Memorandum Instructions, per SM2401 Flowchart.
Engine
3 bulletinsRevised: Coolant leaks at the transmission cooler fittings on the radiator are occurring due to deformation of the...
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gasket used to seal off the transmission cooler. This deformation is caused from transmission oil wicking through the thread adapter threads and exposing the lower portion of the gasket to transmission oil. Re-configure hydraulic interface between the transmission cooler lines and the transmission oil cooler. SU2302 Revised to include Labor Time of 1 Hour and a Component Code. Incorrect wording on the Header Page beginning on Page 2.
Revised: Coolant leaks at the transmission cooler fittings on the radiator are occurring due to deformation of the...
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gasket used to seal off the transmission cooler. This deformation is caused from transmission oil wicking through the thread adapter threads and exposing the lower portion of the gasket to transmission oil. Re-configure hydraulic interface between the transmission cooler lines and the transmission oil cooler. SU2302 Revised to include Labor Time of 1 Hour and a Component Code.
Coolant leaks at the transmission cooler fittings on the radiator are occurring due to deformation of the gasket used to...
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seal off the transmission cooler. This deformation is caused from transmission oil wicking through the thread adapter threads and exposing the lower portion of the gasket to transmission oil. Re-configure hydraulic interface between the transmission cooler lines and the transmission oil cooler.
Brakes
1 bulletinThe mechanical brake switch & bracket design has a potential for cumulative at-limit stack up clearances to exceed the...
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limitations of the mechanical switch. As a result, a preventative maintenance adjustment procedure is necessary and, at times, settings can be difficult to achieve.