UnionSpecial 63900 Adjustment Manual

Also see for 63900 Series: Instructions for adjusting and operating

Contents

UnionSpecial 63900 Adjustment Manual Manual pdf 22 page image

22UPPER MAIN SHAFT (CONT.)TO CHECK FOR ALIGNMENT1. Remove the presser bar spring, washer and regulator screw.2. Rotate the handwheel so that the needle bar is at thebottom of its stroke. Loosen hexagonal head screwon back of the presser bar roller bracket, and setscrew on left side or roller bracket. Then loosen screwon presser bar guide and remove presser bar, presserbar spring washer and presser bar guide.3. Remove the upper left plastic plug on the back of themachine and loosen screw in plug hole. Removetake-up lever pin. With light inward finger pressure,move the take-up lever to the take-up lever boss.There should be a small amount of interference between the lever and the boss. With light outwardfinger pressure, move the lever across the boss face.There should be clearance between the boss faceand lever. These two tests, in effect, are checkingthe lateral play of the take-up and provide for opera-tion of the take-up in the center of the lateral play.Now, line up the take-up lever hole in the lever boss.Insert the oil wick about 1/2 inch in the bore of the take-up lever. With the oil groove up, insert the take-up lever pin in the lever, making sure the wick is in the groove and press the pin into its hole in the arm. Thereshould be no end play in the take-up lever after the set screw is securely tightened. Replace the plasticp l u g .Replace presser bar guide and presser bar spring washerinto position. Place presser bar into presser bar rollerbracket with flat on bar to the rear and tighten hexhead screw and set screw securely.Line up needle hole in the presser foot with the needleand tighten presser bar guide screw.Assemble presser spring, presser spring washer andpresser spring regulator screw.Refer to paragraph on "Presser Bar Guide" for propersetting of the guide.Should the alignment test show the main shaft is out ofposition, the upper sprocket and handwheel should beloosened and the shaft moved left or right as theconditions indicate. Retighten sprocket and handwheelso that there is no end play in the upper main shaft andrepeat the alignment check.HANDWHEELThe handwheel is constructed so as to minimize noise and is therefore isolated from the pulley by shockmounts. If for any reason the handwheel is disassembled, the following steps should be used for reassembly.