{"id":40883,"date":"2025-03-03T09:02:03","date_gmt":"2025-03-03T09:02:03","guid":{"rendered":"https:\/\/www.dayco.com\/?post_type=techhub&#038;p=40883"},"modified":"2025-03-04T12:16:53","modified_gmt":"2025-03-04T12:16:53","slug":"front-end-accessory-drive-system-maintenance-for-heavy-duty-trucks","status":"publish","type":"techhub","link":"https:\/\/www.dayco.com\/na-en\/techhub\/front-end-accessory-drive-system-maintenance-for-heavy-duty-trucks\/","title":{"rendered":"Front End Accessory Drive System Maintenance for Heavy-Duty Trucks"},"content":{"rendered":"[vc_row type=&#8221;full_width_background&#8221; full_screen_row_position=&#8221;middle&#8221; column_margin=&#8221;default&#8221; column_direction=&#8221;default&#8221; column_direction_tablet=&#8221;default&#8221; column_direction_phone=&#8221;default&#8221; bg_color=&#8221;#f4f4f4&#8243; scene_position=&#8221;center&#8221; text_color=&#8221;dark&#8221; text_align=&#8221;left&#8221; row_border_radius=&#8221;none&#8221; row_border_radius_applies=&#8221;bg&#8221; overflow=&#8221;visible&#8221; overlay_strength=&#8221;0.3&#8243; gradient_direction=&#8221;left_to_right&#8221; shape_divider_position=&#8221;bottom&#8221; bg_image_animation=&#8221;none&#8221; shape_type=&#8221;&#8221;][vc_column column_padding=&#8221;padding-4-percent&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; column_element_direction_desktop=&#8221;default&#8221; column_element_spacing=&#8221;default&#8221; desktop_text_alignment=&#8221;default&#8221; tablet_text_alignment=&#8221;default&#8221; phone_text_alignment=&#8221;default&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_backdrop_filter=&#8221;none&#8221; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; column_position=&#8221;default&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/1&#8243; tablet_width_inherit=&#8221;default&#8221; animation_type=&#8221;default&#8221; bg_image_animation=&#8221;none&#8221; border_type=&#8221;simple&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221;][vc_custom_heading source=&#8221;post_title&#8221; font_container=&#8221;tag:h1|text_align:left&#8221; use_theme_fonts=&#8221;yes&#8221;][vc_custom_heading text=&#8221;Inspect Belts During Oil Changes, Replace at 300,000 Miles&#8221; use_theme_fonts=&#8221;yes&#8221;][divider line_type=&#8221;Small Line&#8221; line_alignment=&#8221;default&#8221; line_thickness=&#8221;2&#8243; divider_color=&#8221;accent-color&#8221; animate=&#8221;yes&#8221; custom_height=&#8221;40&#8243; custom_line_width=&#8221;130&#8243;][vc_column_text]Just like many other components on today\u2019s class 4-8 trucks, it\u2019s important that mechanics look at the belt, pulleys and tensioner as a whole system and replace all components at once. Called the front-end accessory drive system (or FEAD for short), most commercial vehicle OEMs recommend inspections during oil changes, or at around 100,000 miles, and full replacement around 300,000 miles. All three components experience wear and tear gradually over time so replacing the two pulleys, tensioner and belt altogether will allow for more enhanced performance. It\u2019s important to note that if just the belt is replaced, the truck may experience a loose tensioner or pulley within a short period of time, and may require another belt due to premature failure.<\/p>\n<h2>Front End Drive System Warning Signs<\/h2>\n<p>If a technician is unsure whether a big rig\u2019s FEAD system needs replacement, here are two key warning signs:<\/p>\n<h3>1. Heavy-Duty Truck Belt Noise<\/h3>\n<p>Different noises correlate to different problems. Spray water on the belt with the engine running and then listen for one of these two sounds.<\/p>\n<ul>\n<li><strong>Chirp \u2013<\/strong> Intermittent noises that are sharp, as belt speed increases pitch and volume stay constant. A chirp is often the result of misalignment, improper installation or worn parts. If this noise continues with a light spray of water, further investigation is needed to determine the cause of misalignment.<\/li>\n<li><strong>Squeal \u2013<\/strong> High pitched noise that lasts several seconds and doesn\u2019t change in pitch. It may change with acceleration or an added accessory load. If the noise goes away with a light water spray, it is usually a sign of tension loss.<\/li>\n<\/ul>\n[\/vc_column_text][divider line_type=&#8221;No Line&#8221; custom_height=&#8221;20&#8243;][vc_row_inner equal_height=&#8221;yes&#8221; column_margin=&#8221;default&#8221; column_direction=&#8221;default&#8221; column_direction_tablet=&#8221;default&#8221; column_direction_phone=&#8221;default&#8221; text_align=&#8221;left&#8221; row_position=&#8221;default&#8221; row_position_tablet=&#8221;inherit&#8221; row_position_phone=&#8221;inherit&#8221; overflow=&#8221;visible&#8221; pointer_events=&#8221;all&#8221;][vc_column_inner column_padding=&#8221;no-extra-padding&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; column_element_direction_desktop=&#8221;default&#8221; column_element_spacing=&#8221;default&#8221; desktop_text_alignment=&#8221;default&#8221; tablet_text_alignment=&#8221;default&#8221; phone_text_alignment=&#8221;default&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; column_backdrop_filter=&#8221;none&#8221; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; overflow=&#8221;visible&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/2&#8243; tablet_width_inherit=&#8221;default&#8221; animation_type=&#8221;default&#8221; bg_image_animation=&#8221;none&#8221; border_type=&#8221;simple&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221;][vc_column_text]\n<h3>2. Heavy-Duty Belt Alignment<\/h3>\n<p>A technician should examine the way the belt tracks. If it is tracking off center, at or off the edge of the pulley, or if the belt flips off the tensioner, this could be a sign of tensioner misalignment caused by bushing wear.[\/vc_column_text][\/vc_column_inner][vc_column_inner column_padding=&#8221;no-extra-padding&#8221; column_padding_tablet=&#8221;inherit&#8221; column_padding_phone=&#8221;inherit&#8221; column_padding_position=&#8221;all&#8221; column_element_direction_desktop=&#8221;default&#8221; column_element_spacing=&#8221;default&#8221; desktop_text_alignment=&#8221;default&#8221; tablet_text_alignment=&#8221;default&#8221; phone_text_alignment=&#8221;default&#8221; background_color_opacity=&#8221;1&#8243; background_hover_color_opacity=&#8221;1&#8243; background_image=&#8221;39043&#8243; background_image_position=&#8221;center center&#8221; background_image_stacking=&#8221;default&#8221; enable_bg_scale=&#8221;true&#8221; background_image_loading=&#8221;default&#8221; column_backdrop_filter=&#8221;none&#8221; column_shadow=&#8221;none&#8221; column_border_radius=&#8221;none&#8221; column_link_target=&#8221;_self&#8221; overflow=&#8221;visible&#8221; gradient_direction=&#8221;left_to_right&#8221; overlay_strength=&#8221;0.3&#8243; width=&#8221;1\/2&#8243; tablet_width_inherit=&#8221;default&#8221; animation_type=&#8221;default&#8221; bg_image_animation=&#8221;none&#8221; border_type=&#8221;simple&#8221; column_border_width=&#8221;none&#8221; column_border_style=&#8221;solid&#8221; column_padding_type=&#8221;default&#8221; gradient_type=&#8221;default&#8221;][divider line_type=&#8221;No Line&#8221; custom_height=&#8221;22vh&#8221;][\/vc_column_inner][\/vc_row_inner][divider line_type=&#8221;No Line&#8221; custom_height=&#8221;10&#8243;][vc_column_text]\n<h2>Belt, Tensioner and Pulley Replacement a Best Practice<\/h2>\n<p>Replacing all the components at the same time enables mechanics to ensure the front-end accessory drive system is completely aligned. Checking and replacing the belt alone could be problematic as it rarely solves the vehicle\u2019s issue. In an effort to avoid downtime, replace the tensioner assembly and associated pulleys when the belt is changed.[\/vc_column_text][\/vc_column][\/vc_row]\n","protected":false},"excerpt":{"rendered":"<p>Just like many other components on today\u2019s class 4-8 trucks, it\u2019s important that mechanics look at the belt, pulley and tensioner as a whole system&#8230;<\/p>\n","protected":false},"featured_media":39059,"menu_order":0,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"topic":[2594,2135],"contenttype":[2225],"th_application":[2319],"th_product":[2439],"class_list":["post-40883","techhub","type-techhub","status-publish","has-post-thumbnail","topic-replacement-intervals-info","topic-troubleshooting","contenttype-tech-article","th_application-heavy-duty","th_product-drive-systems"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Dayco | Front End Accessory Drive System Maintenance for Heavy-Duty Trucks - NAM | EN<\/title>\n<meta name=\"description\" content=\"Avoid downtime. 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