{"id":1851,"date":"2017-05-25T04:20:19","date_gmt":"2017-05-25T03:20:19","guid":{"rendered":"https:\/\/www.globaldimension.com\/2017\/05\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/"},"modified":"2017-05-25T04:20:19","modified_gmt":"2017-05-25T03:20:19","slug":"harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft","status":"publish","type":"post","link":"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/","title":{"rendered":"H-D Aermacchi 39984-69P, Rear Chain Adjuster Assembly Threaded Shaft"},"content":{"rendered":"<p>What is a \u201839984-69P#Shaft#, REAR CHAIN ADJUSTER ASSEMBLY Threaded Shaft\u2019?\u00a0 Does this keep you awake at night?<\/p>\n<p>The rear axle adjusters of Harley-Davidson \/ Aermacchi 350cc street bikes, along with the racing bikes of 250cc CRS\/350cc ERS are called \u201839984-69P, REAR CHAIN ADJUSTER ASSEMBLY\u2019 <a href=\"#_ftn1\" name=\"_ftnref1\">[1]<\/a>.\u00a0 The mysterious \u2018threaded shaft\u2019 is part of an assembly.\u00a0 When welded to the \u2018adjuster body\u2019 it becomes the assembly affectionately known as 39984-69P.\u00a0 These sub-parts that make up the \u201839984-69P, REAR CHAIN ADJUSTER ASSEMBLY\u2019 are called:<\/p>\n<ul>\n<li>39984-69P#Shaft#, REAR CHAIN ADJUSTER ASSEMBLY Threaded Shaft, and this decodes into:\n<ul>\n<li>Title for the drawing\/BOM: REAR CHAIN ADJUSTER ASSEMBLY Threaded Shaft<\/li>\n<li>Part number: 39984-69P#Shaft#<\/li>\n<li>File name of CAD files: \u201839984-69P#Shaft#, REAR CHAIN ADJUSTER ASSEMBLY Threaded Shaft. SLDPRT\u2019<\/li>\n<\/ul>\n<\/li>\n<li>39984-69P#Body#, REAR CHAIN ADJUSTER ASSEMBLY Adjuster Body, and this decodes into:\n<ul>\n<li>Title for the drawing\/BOM: REAR CHAIN ADJUSTER ASSEMBLY Adjuster Body<\/li>\n<li>Part number: 39984-69P#Body#<\/li>\n<li>File name of CAD files: \u201839984-69P#Body#, REAR CHAIN ADJUSTER ASSEMBLY Adjuster Body.SLDPRT\u2019<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Naming convention details are located <a href=\"\/?p=441\">here<\/a>.<\/p>\n<p>[irp posts=&#8221;441&#8243; name=&#8221;Naming conventions for Aermacchi \/ Harley-Davidson project&#8221;]<\/p>\n<p>The shaft has a 10mm thread. The DIN 934<a href=\"#_ftn2\" name=\"_ftnref2\">[2]<\/a> standard gives good parameters for this thread.\u00a0\u00a0 This nut is 17mm across the flats, and this does not follow DIN.\u00a0 You can read more about the nuts, in brutal detail, on another article on this site called \u2018<a href=\"\/2017\/03\/harley-davidson-aermacchi-7801p-nut-10mm\/\">Harley-Davidson Aermacchi 7801P NUT, 10mm<\/a>\u2019.<br \/>\n<img decoding=\"async\" class=\"aligncenter size-large wp-image-472\" src=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft-1024x556.jpg\" alt=\"\" width=\"1024\" height=\"556\" srcset=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft-1024x556.jpg 1024w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft-300x163.jpg 300w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft-768x417.jpg 768w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft-600x326.jpg 600w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft.jpg 1656w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>Figure 1: 39984-69P#Shaft#, REAR CHAIN ADJUSTER ASSEMBLY Threaded Shaft<\/p>\n<p>For the casual observer, if you looked at the assembled part, you would not immediately think \u201chey, this is 2 parts\u201d. But Figure 1 clearly shows a shaft and a body welded together.\u00a0 From the side view perspective, you would be tempted to think they just butted the 2 sub-parts together and welded.\u00a0 On closer examination, the \u2018body\u2019 has a 6mm diameter hole drilled in the side of it, to accept the 10mm threaded shaft that is machined down to 8mm diameter and then further down to 6mm diameter.\u00a0 See the pretty picture in Figure 2, below.<\/p>\n<p>The hole in the \u2018adjuster body\u2019 is clearly visible in Figure 3.<\/p>\n<p>We will update this article when the 3D CAD and 2D drawings are finished, with links to these CAD files.\u00a0 Here is a small taste of the CAD, below. Note: All values are nominal values.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-471\" src=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_CAD-1024x545.jpg\" alt=\"\" width=\"1024\" height=\"545\" srcset=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_CAD-1024x545.jpg 1024w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_CAD-300x160.jpg 300w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_CAD-768x409.jpg 768w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_CAD-600x319.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>Figure 2: Chain adjuster for 350cc Aermacchi with nuts 7801P and 7801P#thin#.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-473\" src=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE-1024x658.jpg\" alt=\"\" width=\"1024\" height=\"658\" srcset=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE-1024x658.jpg 1024w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE-300x193.jpg 300w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE-768x493.jpg 768w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE-600x385.jpg 600w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE.jpg 1960w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>Figure 3: Chain adjuster body, with 6mm diameter hole that accepts a press-fitted shaft.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-440\" src=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Catalog_39984-69P-Rear-Chain-Aduster-Assembly-734x1024.jpg\" alt=\"\" width=\"734\" height=\"1024\" srcset=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Catalog_39984-69P-Rear-Chain-Aduster-Assembly-734x1024.jpg 734w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Catalog_39984-69P-Rear-Chain-Aduster-Assembly-215x300.jpg 215w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Catalog_39984-69P-Rear-Chain-Aduster-Assembly-768x1071.jpg 768w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Catalog_39984-69P-Rear-Chain-Aduster-Assembly-600x837.jpg 600w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Catalog_39984-69P-Rear-Chain-Aduster-Assembly.jpg 1111w\" sizes=\"(max-width: 734px) 100vw, 734px\" \/><\/p>\n<p>Figure 4: \u201839984-69P, Rear Chain Adjuster Assembly\u2019 from Harley-Davidson Sprint parts catalogue (April 1972)<\/p>\n<p><a href=\"#_ftnref1\" name=\"_ftn1\">[1]<\/a> Harley-Davidson Sprint parts catalogue covering 1962-1972 (Issued: April 1972)<\/p>\n<p><a href=\"#_ftnref2\" name=\"_ftn2\">[2]<\/a> <a href=\"http:\/\/www.fasteners.eu\/standards\/DIN\/934\/\">http:\/\/www.fasteners.eu\/standards\/DIN\/934\/<\/a><\/p>\n<h2><img decoding=\"async\" class=\"wp-image-313\" src=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/03\/cropped-Global_Dimension_Logo_Gear_Only.png\" alt=\"Global Dimension \u2013 3D Designs for tomorrow\" width=\"50\" height=\"50\" srcset=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/03\/cropped-Global_Dimension_Logo_Gear_Only.png 512w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/03\/cropped-Global_Dimension_Logo_Gear_Only-150x150.png 150w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/03\/cropped-Global_Dimension_Logo_Gear_Only-300x300.png 300w, https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/03\/cropped-Global_Dimension_Logo_Gear_Only-45x45.png 45w\" sizes=\"(max-width: 50px) 100vw, 50px\" \/>\u00a0Related Posts<\/h2>\n<p>[irp posts=&#8221;476&#8243; name=&#8221;Harley-Davidson Aermacchi 39984-69P, REAR CHAIN ADJUSTER ASSEMBLY Adjuster Body&#8221;]<\/p>\n<p>[irp posts=&#8221;459&#8243; name=&#8221;Harley-Davidson Aermacchi 39984-69P, Rear Chain Adjuster Assembly&#8221;]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is a \u201839984-69P#Shaft#, REAR CHAIN ADJUSTER ASSEMBLY Threaded Shaft\u2019?\u00a0 Does this keep you awake at night? The rear axle adjusters of Harley-Davidson \/ Aermacchi 350cc street bikes, along with the racing bikes of 250cc CRS\/350cc ERS are called \u201839984-69P, REAR CHAIN ADJUSTER ASSEMBLY\u2019 [1].\u00a0 The mysterious \u2018threaded shaft\u2019 is part of an assembly.\u00a0 When [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1444,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[74,75],"tags":[76,77,78,71],"class_list":["post-1851","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aermacchi-motorcycles-th","category-motorcycles-th","tag-aermacchi-th","tag-chain-adjuster-th","tag-harley-davidson-th","tag-reverse-engineer-th"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>H-D Aermacchi 39984-69P, Rear Chain Adjuster Assembly Threaded Shaft - Global Dimension<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/\" \/>\n<meta property=\"og:locale\" content=\"th_TH\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"H-D Aermacchi 39984-69P, Rear Chain Adjuster Assembly Threaded Shaft - Global Dimension\" \/>\n<meta property=\"og:description\" content=\"What is a \u201839984-69P#Shaft#, REAR CHAIN ADJUSTER ASSEMBLY Threaded Shaft\u2019?\u00a0 Does this keep you awake at night? The rear axle adjusters of Harley-Davidson \/ Aermacchi 350cc street bikes, along with the racing bikes of 250cc CRS\/350cc ERS are called \u201839984-69P, REAR CHAIN ADJUSTER ASSEMBLY\u2019 [1].\u00a0 The mysterious \u2018threaded shaft\u2019 is part of an assembly.\u00a0 When [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/\" \/>\n<meta property=\"og:site_name\" content=\"Global Dimension\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/GlobalDimensionDesign\/\" \/>\n<meta property=\"article:published_time\" content=\"2017-05-25T03:20:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1960\" \/>\n\t<meta property=\"og:image:height\" content=\"1259\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"uprightfan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@GlobalDDD\" \/>\n<meta name=\"twitter:site\" content=\"@GlobalDDD\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"uprightfan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/\"},\"author\":{\"name\":\"uprightfan\",\"@id\":\"https:\/\/www.globaldimension.com\/#\/schema\/person\/313e2a7ad6059d3e16fd8bc43e3756e5\"},\"headline\":\"H-D Aermacchi 39984-69P, Rear Chain Adjuster Assembly Threaded Shaft\",\"datePublished\":\"2017-05-25T03:20:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/\"},\"wordCount\":475,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.globaldimension.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.globaldimension.com\/wp-content\/uploads\/2017\/05\/Aermacchi_39984-69PShaft-Rear-Chain-Aduster-Assembly_Threaded_Shaft_HOLE.jpg\",\"keywords\":[\"Aermacchi\",\"Chain Adjuster\",\"Harley-Davidson\",\"Reverse Engineer\"],\"articleSection\":[\"Aermacchi motorcycles\",\"Motorcycles\"],\"inLanguage\":\"th-TH\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/\",\"url\":\"https:\/\/www.globaldimension.com\/th\/harley-davidson-aermacchi-39984-69p-rear-chain-adjuster-assembly-threaded-shaft\/\",\"name\":\"H-D Aermacchi 39984-69P, Rear Chain Adjuster Assembly Threaded Shaft - 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