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It also covers cam follower adjustments, the stitch expander mechanism, and the automatic buttonholer setup, control panel operation, and timing-related checks.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/kenmore-15890-service-manual-adjustments-and-service-procedures/662140/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/kenmore-15890-service-manual-adjustments-and-service-procedures/662140.png","ImageObject",300,407,{"name":42,"@type":43},"Mia  ","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-29","2026-10-28",true,{"@type":52,"interactionType":53,"userInteractionCount":30},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"What additional features does the model 158.900 have compared with model 158.880?","Question",{"text":62,"@type":63},"The booklet states that feeding, needle position, and stitch width can be controlled by cams, and the machine can make key-hole, eyelet, and regular buttonholes in multiple sizes without turning the material or readjusting. It also notes a simplified control panel and support for making patterns with either single or double needle.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How does the manual approach straight stitch troubleshooting?",{"text":67,"@type":63},"It provides preliminary checks and then specific adjustment sections for material feed problems, skipping stitches, needle hitting the needle plate or shuttle, noise reduction, thread breaking, machine binding, and motor running issues.",{"name":69,"@type":60,"acceptedAnswer":70},"Which components are adjusted for zigzag performance issues?",{"text":71,"@type":63},"For zigzag problems, the manual focuses on the zigzag control panel and \"0\" stitch width setting, then addresses causes like zigzag stitch being too narrow, needle movement while in the material, and ragged zigzag appearance through related zigzag mechanism 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SERVICE DEPARTMENT 731A-CHICAGO  \nDIV.20  \nNOVEMBER 1961  \nNO.9  \nPRICE $1.50  \nO  \n○  \n〇  \nINTRODUCTION  \nThe new Sears model 158.900 represents one ofthe greatest advances in art of building sewingmachines in a number of years.Mechanically,you will find it simllar to the model 158.880,but with the following additional features:  \n1.The feeding of the material,as well as theneedle position and stitch width can now becontrolled by cams.  \n2.The machine is now capable of making key-hole,eyelet,and regular buttonholes in anumber of sizes without turning the materialor readjusting the machine.Each button-hole is made exactly the same size as theprevious buttonholes unless the machinesettings are changed.No need to measureor guess at the buttonhole size.  \n3.New simplified control panel makes themachine easler to operate.  \n4.All 30 patterns can now be made witheither a single or double needle.  \nThis booklet is designed to help you insure thecustomer satisfaction which this machine bothmechanically and featurewise,was designed toprovide.  \nTABLE OF CONTENTS  \n# I.Obtaining Access to the Model 90 for Service\n\n1.Needle bar-presser bar area access  \n2.Drive belt,connecting rod and stitch length area access  \n3.Shuttle drive and sector gear  \n4.Zigzag,stitch expander and cam follower mechanism area access  \n5.Zigzag guide bar and stitch expander area access  \n6.Zigzag control panel area access  \n# II.Adjusting the Straight Stitch Mechamism\n\n1.Preliminary checks  \n2.Material feed problem  \n3.Skipping stitches  \n4.Needle hitting needle plate or shuttle  \n5.Reducing noise  \n6.Breaking thread  \n7.Machine binds  \n8.Motor doesn't run properly  \n# III.Adjusting the Zigzag Mechanism\n\n1.The zigzag control panel and“0”stitch width setting  \n2.Zigzag stitch too narrow  \n3.Needle moves while it is in the material  \n4.Zigzag stitch looks ragged  \n# IV.Adjusting the Cam Follower Mechanism\n\n1.How the mechanism works  \n2.Stitch width follower adjustment  \n3.Needle position follower adjustment  \n4.Material feed follower adjustment  \n5.Automatic positioning of follower to receive cams  \n# V.The Stitch Expander Mechanism\n\n1.How stitch expander works  \n2.Timing cam follower action(Needle swings while in material whenusing cam No.20)  \n# VI.Adjusting the automatic buttonholer\n\n1.How it works  \n2.Adjusting the automatic buttonholer  \n5  \n5  \n5  \n5  \n5  \n5  \n5  \n9  \n9  \n10  \n11  \n11  \n11  \n11  \n12  \n25  \n25  \n26  \n2626  \n31  \n31  \n31  \n32  \n32  \n35  \n35  \n48  \n48  \n48  \nO  \nO  \nO  \nFigure 1  \n1.Hand Hole Cover Plate7.Thread Take-Up Lever13.Stiich Length Confrol Knob  \n2.Presser Foot8.Upper Thread Guides14.Reverse Stitch Push Button  \n3.Presser Foot Screw9.Stitch Expander  \n15.Bobbin Winder Tension Disc  \n4.Face Cover Thread Guides10.Stitch Width Control Knob  \n5.Thread Tension Assembly11.Needle Position Control Knob16.Feed Dog Confrol Knob  \n6.Face Cover Plafe12.Bobbin Winder Mechanism17.Nomenclature Plate  \nFigure 2  \n18.Thread Spool Pin for BobbinWinder  \n19.Clutch Release  \n20.Hand Wheel  \n21.Arm Cover Plate  \n22.Thread Spool Pins  \n23.Cover to Automatic DecoratingStitch Mechanism  \n24.Presser Foot Pressure Regulator  \n25.Presser Foot Lever  \n26.Light Switch  \n27 Thread Cutter  \n28.Needle Clamp Screw  \n29.Needle Plate  \n30.Guide Pin Hole for ButtonholeAttachment  \n0  \nO  \nO  \nFigure 3  \nThis under base view shows the new special hand hold cover plate located as it would be formaking buttonholes.Also see Figures 43 to 47.  \nO  \n〇  \n0  \nPICTURE INFORMATION  \nFigures 1 to 3Front,Rear and Under Bedplate Views  \nFigures 4 to 5Front and Rear Cut-a-way Views  \nFigures 6 to 8  \nFace End Views  \nFigures 9,10,11 and 12Shuttle and Gear Case Views  \nFigure 13Hand Wheel End View  \nFigure 14Motor Mount Position View  \nFigure 15 to 23Stitch Length(Feed)Control Mechanism  \nFigure 24  \nFront Control Panel Assembly  \nFigure 25 to 29  \nZigzag Control Panel S","cbCaidX2Oge9ZBkr","https://ap.wps.com/l/cbCaidX2Oge9ZBkr","pdf",24196572,57,"English","# I. Obtaining Access to the Model 90 for Service\n## Needle bar-presser bar area access\n## Drive belt, connecting rod and stitch length area access\n## Shuttle drive and sector gear\n## Zigzag, stitch expander and cam follower mechanism area access\n## Zigzag guide bar and stitch expander area access\n## Zigzag control panel area access\n# II. Adjusting the Straight Stitch Mechanism\n## Preliminary checks\n## Material feed problem\n## Skipping stitches\n## Needle hitting needle plate or shuttle\n## Reducing noise\n## Breaking thread\n## Machine binds\n## Motor doesn't run properly\n# III. Adjusting the Zigzag Mechanism\n## The zigzag control panel and \"0\" stitch width setting\n## Zigzag stitch too narrow\n## Needle moves while it is in the material\n## Zigzag stitch looks ragged\n# IV. Adjusting the Cam Follower Mechanism\n## How the mechanism works\n## Stitch width follower adjustment\n## Needle position follower adjustment\n## Material feed follower adjustment\n## Automatic positioning of follower to receive cams\n# V. The Stitch Expander Mechanism\n## How stitch expander works\n## Timing cam follower action (Needle swings while in material when using cam No.20)\n# VI. Adjusting the automatic buttonholer\n## How it works\n## Adjusting the automatic buttonholer","[{\"question\":\"What additional features does the model 158.900 have compared with model 158.880?\",\"answer\":\"The booklet states that feeding, needle position, and stitch width can be controlled by cams, and the machine can make key-hole, eyelet, and regular buttonholes in multiple sizes without turning the material or readjusting. It also notes a simplified control panel and support for making patterns with either single or double needle.\"},{\"question\":\"How does the manual approach straight stitch troubleshooting?\",\"answer\":\"It provides preliminary checks and then specific adjustment sections for material feed problems, skipping stitches, needle hitting the needle plate or shuttle, noise reduction, thread breaking, machine binding, and motor running issues.\"},{\"question\":\"Which components are adjusted for zigzag performance issues?\",\"answer\":\"For zigzag problems, the manual focuses on the zigzag control panel and \\\"0\\\" stitch width setting, then addresses causes like zigzag stitch being too narrow, needle movement while in the material, and ragged zigzag appearance through related zigzag mechanism adjustments.\"}]","Kenmore 158.90 Service Manual - Adjustments and Service Procedures | PDF",144]