UnionSpecial 63900 Adjustment Manual

Also see for 63900 Series: Instructions for adjusting and operating

Contents

UnionSpecial 63900 Adjustment Manual Manual pdf 16 page image

16NEEDLE GUARD INSTRUCTIONS (CONT.)CAUTION! Damage to the hook point may result if too much metal is removed from the needle guardingsurface.The bobbin case holder should be thoroughly cleaned before reassembly into the hook base.When altering needle guarding surface, it is suggested that the hook NOT BE REMOVED or disturbed from itstimed position.The bobbin case holder only may be removed by removing gib screws and gib and pulling on bobbin casestem as the handwheel is rocked backward and forward slightly.HOOK LUBRICATIONCAUTION! Do not run the machine without the bobbin case in thehook as hook damage may result.With the bobbin case in hook, run machine for a full minute. Place a pieceof white paper directly under the hook and continue running the machine.After about five seconds, remove the paper and a definite and distinctpattern of oil spots should be observed.Should more or less oil be required, turn oil control adjusting shaft (H, Fig.3), located on the front of the machine just blow the cloth plate surface,in direction of the change required. After a change in the hook oil flow,the machine should be run about one minute before checking for thedesired oil flow.PRESSER BAR GUIDEWhen locating presser bar guide (C, Fig. 17) presser foot must rest directlyagainst throat plate. Proper setting of guide is 5 3/64 inches betweenunderside of presser bar guide and the top of throat plate (Fig. 17). Toobtain this setting, remove pressure from the presser spring (A) and loosenset screw (D). Tap on presser foot to insure it is down against throat plate.Set guide to the 5 3/64 inch dimension, center foot by turning it so needleenters the middle of its slot and retighten screw (D). Apply pressure to topfeed roller by turning regulator (E) clockwise.Set needle thread pull-up bracket (F) so that underside of wire is 45/8 inches above throat plate (Fig. 17).PRESER BAR CONNECTIONPresser bar conection (G, Fig. 17) should be set about 1/16 inchbelow prese bar guide (C). Accomplish this by loosening lick nut (A,Fig. 16), and relocating stop screw (B) on lifter lever bell crank (C),located at the back of machine, under bed plate. turning stopscrew to right or left, properly sets presser car connection. Tightenlock nut (A) to lock stop screw.