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Since 1858

technical Support

1-800-327-9420

6

 

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andall

 

UnIOn

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Ock

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tItch

Wax / Bobbin

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UnIOn

 l

Ock

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Winding the Bobbin

• For natural threads, leave the label up on the spool of thread

• Put the thread through the extended wire of the bobbin winder and then through 

the small wire hook.  come over the top of the thread disk twice for better 

tension adjustment.  

• Slide the threader (UL-531), through the wax pot and grab the thread and pull it 

through the wax pot.  The nuts on the wax pot will turn and adjust how much wax 

to be applied on the thread.  

• Fill the bobbin with equal tension (DO NOT wind the bobbin either very tight or 

very loose, but with firm, even tension).  Bobbins that are wound, either, very 

tight or very loose, or in the same bobbin, tight and loose, will cause the stitch 

length to vary all over the place; and this is the cause of the problem.

• Start off by winding the thread over the top of the bobbin a couple of times by 

hand.  Again the thread, coming out of the wax pot, should feed over the bobbin. 

The bobbin will spin in a counter clockwise motion.  Do not overfill the bobbin.  

leave a small open area so that the thread is not unraveling off of the bobbin.

threading the Bobbin

• Insure that the bobbin spring (UL-292) has been placed in the 

shuttle with the prongs of the spring bent facing the bobbin (to 

the operator’s right). 

• Put the bobbin into the shuttle. The thread should flow off 

the bobbin easily, from the top and the bobbin in a clockwise 

rotation. 

• Place the bobbin cover (UL-291) over the bobbin and close 

the bobbin door. Make sure that a length of thread is pulled 

out of the bobbin door between the spring and the door latch. 

removing the Bobbin

• Release the cover latch and open bobbin door

• Remove the bobbin cover (UL-291)

• Remove the bobbin (UL-290)

B

OBBIN

 S

eTUP

T

hReAd

 w

AX

 & 

L

UBRICANT

fresh wax strengthens the thread 

and causes it to stick in place. The 

stronger the thread, the less breakage 

in the operation of the machine. wax 

will also lubricate your thread for 

smoother operation. wax is especially 

recommended for threads made of 

natural fibers.

Liquid thread Wax

• Mix your wax thoroughly to ensure good results.

• Before sewing, clean your machine, oil rollers and 

gummed up mechanisms. pull out and cut off both upper 

and lower threads that have hardened.

• Only use enough liquid wax in your machine wax pot to 

cover your thread (approximately half full) or enough for a 

days use. Anything in excess may thicken before it can be 

used. 

• Do not neglect to renew wax frequently, or your thread 

may become unreliable and break. The fresher your wax, 

the better your machine will work. 

• It is best to wind your bobbins as you use them, as a fresh 

bobbin will do better work than an old one.

• Be careful to have strippers in wax pot tight enough to 

clean off all surplus wax

• Adjust Strippers as necessary and clean out the Wax Pot 

occasionally

LAx Wax - Water Based Wax

• If LAX Wax Thread Lubricator is used, it is possible to thin 

or clean the lube with water.

hot Wax

• If hot wax is desired the machine must be requested with 

special ordered heated wax pots

thread Lubricant

• When sewing with synthetic threads, Lily White Oil or 

Silicone lubricant can be used. 

Summary of Contents for UNION Lockstitch

Page 1: ...UNION Needle and Awl Lock Stitch Sewing Machine Serial Number _______________ Manufactured by Randall Leather Machinery Company 401 Irvine Street Yoakum Texas 77995 USA 1 800 327 9420 or 1 361 293 701...

Page 2: ...mence Sewing 7 ADJUSTMENTS SERVICING Common ADJUSTMENTS 8 OILING CLEANING 8 PRESSER FOOT ADJUSTMENT 9 THREAD Lock 10 THREAD TENSION 10 STITCH LENGTH 10 THREAD Guide ADJUSTMENT 11 Looper Cam ADJUSTMENT...

Page 3: ...wise if you are facing the wheel Use caution and give proper attention to the operation of your machine when sewing Keep your hands away from the needle and awl when the power is on and the machine is...

Page 4: ...ghten the belt tension be lowering the motor with the adjustable motor bracket Lock the motor into postion with the bracket nuts once the fire tension is acheived Pedal Linkage Connect and adjust the...

Page 5: ...wax pot up to the the machine casting and lock in place with the clamping nut Presser Foot Spring Place the upper bracket and spring on top of the machin head With the left hand compress the coil spr...

Page 6: ...is sharp and does not spring or glance off the work when entering the work Synthetic Twisted Natural Cord Needle Size 138 3 cord 1 to 1 1 2 207 4 cord 1 1 2 to 2 277 5 cord 2 1 2 to 3 346 6 cord 3 to...

Page 7: ...he threading wire UL 531 through the wax pot extension and pull the thread through 7 Fig 1 Turn the hand wheel to get access to the lock UL 145 Put the threader through the lock UL 145 grab the thread...

Page 8: ...UL 291 over the bobbin and close the bobbin door Make sure that a length of thread is pulled out of the bobbin door between the spring and the door latch Removing the Bobbin Release the cover latch an...

Page 9: ...consistent even stitch NOTE The machine may be in perfect adjustment and still fail to sew satisfactory if the operator is careless in handling the work or does not adjust the machine to accommodate...

Page 10: ...tion of Common Adjustments Allowing that a machine is in good condition from a standpoint of wear and lost motion a quick check up of the essential settings can be made in the following order Check th...

Page 11: ...rm UL 116 on the top left of the machine if the operator is sitting in front is turned with the 2 screws facing to the left of the machine To make the foot lift higher loosen the inside screw UL 117 a...

Page 12: ...n obtained when the thread pulls out easily with light tension without excessive binding It is recommended to use less tension when working with threads made of natural fibers To give more tension on...

Page 13: ...elay the thread by loosing the screw in the take up cam and moving the screw to the top The looper should hold the thread until it has descended into the material If not the thread would fall off the...

Page 14: ...wl are not bent When the needle and awl are perfectly aligned the needle should comes up through the material without flexing or hitting the sides of the awl hole To see the alignment set a piece of p...

Page 15: ...hat the set screws are both over the flat spots on the shaft which may require the removal of the set screws to locate which are 90 to each other Tighten one set screw then recheck the timing If this...

Page 16: ...the needle when the needle is on the way down and level with the hook point At this position the hook is about to enter the loop When the Take Up UL 135 is at its highest position the point of the ne...

Page 17: ...pointing straight down the thread looper UL 180 is just about to pick the thread Move the hand wheel until the take up is about to desend In this position the Thread Guide UL 165 takes the thread into...

Page 18: ...tretch or excessive coiling especially near the end of a spool 4 Needle not casting off thread after shuttle picks up loop Check needle timing and its position in relation to the shuttle point 5 After...

Page 19: ...ng lever is worn broken or adjusted improperly 2 Check the Presser Foot Bar Spring or weakness or break age 3 Check the lift of the presser foot bar There should be a 1 8 lift at time of feeding work...

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