Manuals+

Technical Service Information Bulletin

TSIB 25-05 Rev A

Date: Jun 26, 2025

TO:

All Operators

TITLE:

Adjusting the Lower Mount of the HVAC Idler Pulley Bracket

APPLICABILITY:

MCI coaches equipped with Isolated (rubber mounted) idler pulleys bracket

This TSIB is to remind MCI coach operators that when servicing the HVAC belts, idler pulleys or the lower mount of the idler pulley bracket, ensure that the lower mount is adjusted so it is not contacting the bumper support beam nor the bumper itself. Ensure that there is at least ¼” gap between the lower mount and the bumper support beam. Refer to Figures 1 and 2. The idler pulley bracket is mounted with rubber isolators. If the lower mounting bracket is touching the rear bumper support beam, then the vibration from the belts will bypass the rubber isolators and may transfer belt vibration to the coach frame causing noise inside the passenger compartment.

Figure 1: Idler pulley bracket and related components

Description of Figure 1: A close-up view of the HVAC system components. Key elements labeled include: 'Idler pulleys (2 above and 1 underneath the HVAC belt)', 'Idler pulleys bracket', 'Bumper support beam', 'HVAC compressor', and 'Lower mount'. A hand is shown adjusting the lower mount.

Figure 2: Idler pulley bracket lower mount

Description of Figure 2: Two views of the lower mount of the idler pulley bracket. The left image shows the 'Bumper' and 'Lower mount' with an arrow indicating a circled area. The right image provides a closer view of the 'Lower mount' showing bolts and the '1/4" distance' to the bumper support beam. A text box states: 'Ensure this lower mount is not touching the bumper support beam nor the bumper (bumper is removed on this photo for clarity).'

When adjusting the idler pulleys, ensure that they are centered over the HVAC belts as much as possible but also keep the lower mount ¼” away from the bumper support beam and from the bumper.

Description of Figure 3: A view of the idler pulleys and belts. A text box indicates: 'Idler pulleys centered over the belts. Two upper pulleys shown here, there is a 3rd pulley underneath the lower span of the belt as well that also needs to be centered on the belt.'

Direct all inquiries regarding this bulletin to:

Kevin Robinson, CET (he/him)

Manager, Vehicle Systems

Service Engineering

C 204.430.8826

Email: kevin_robinson@newflyer.com

New Flyer | MCI

Models: TSIB 25-05 Rev A, TSIB HVAC Idler Pulley Bracket, TSIB, HVAC Idler Pulley Bracket, Idler Pulley Bracket, Pulley Bracket, Bracket

File Info : application/pdf, 2 Pages, 335.70KB

PDF preview unavailable. Download the PDF instead.

TSIB-25-05-revA-Adjusting-the-lower-mount-of-the-HVAC-idler-pulley-bracket

References

Microsoft Word for Microsoft 365

Related Documents

Preview Centres de Service MCI : Fiabilité et Excellence
Découvrez les centres de service MCI offrant une gamme complète de services d'entretien et de réparation pour autocars, avec un engagement envers la fiabilité, des techniciens certifiés et une garantie de qualité.
Preview MCI Service Centers: Locations, Capabilities, and Guarantees
Find MCI Service Centers across North America for expert coach maintenance, repair, and specialized services. Learn about their Reliadrive guarantee, OEM parts, and certified technicians.
Preview MCI J4500 Ensemble de Service Intensif - Protection Renforcée
Découvrez les caractéristiques de l'ensemble de service intensif pour le bus MCI J4500, conçu pour une durabilité accrue dans les conditions routières difficiles, climats extrêmes et applications industrielles.
Preview MCI Super 60 Limited Warranty Information | MCI Coach
Explore the comprehensive limited warranty for MCI J-Series coaches, including the Super 60 package, covering key components for up to 60 months or 500,000 miles. Learn about MCI's commitment to reliability and support for their touring coaches.
Preview Autocars MCI Série J Varsity : Luxe, Performance et Fiabilité pour Votre Équipe
Découvrez les avantages des autocars MCI Série J Varsity pour le transport d'équipes sportives et de VIP. Personnalisation, sécurité et technologie de pointe.
Preview MCI Varsity J-Series Coaches: Luxury, Dependability, and Sustainability for Team Transport
Discover the MCI Varsity J-Series, North America's leading charter coach. Learn about its advantages for team transportation, customizable luxury interiors, advanced safety features, and eco-friendly emission options. Visit MCIcoach.com/j-series.
Preview MCI J4500 Operator's Manual: Comprehensive Guide to Operation and Safety
This operator's manual provides essential information for the MCI J4500 coach, covering daily inspections, operational features, safety guidelines, and maintenance procedures for drivers.
Preview MCI J Series Coaches: Luxury Chauffeured Transport Solutions
Explore the features, financing, and service options of MCI's J Series coaches, offering unparalleled luxury, safety, and value for chauffeured ground transportation.