Singer 503 - Feed Lifting Rock Shaft Connecting Rod; Feed Forked Connection; Feed Forked Connection on Arm Shaft; Connections Beneath Machine Bed

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Preparation of Machine for Inspection2
Lubrication2
Front View - Oiling Points2
End View - Oiling Points3
Upper Gear Lubrication3
Bottom View, Oiling and Gear Lubrication3
To Set Presser Foot at Correct Height4
Presser Foot in Alignment with Slots in Throat Plate and with Feed Dog4
To Set Feed Dog at Correct Height5
To Set Feed Dog Lengthwise in Throat Plate Slots5
Stitch Length Regulator Set for 12 to 15 Stitches Per Inch5
Feed Dog Adjustments5
To Set Feed Dog Sidewise in Throat Plate Slots6
To Eliminate Noise in Feed Movement6
To Adjust Thread Clearance7
To Set the Take-Up Spring8
To Adjust Needle Thread Tension8
Setting the Stroke8
Setting the Tension8
To Eliminate End Play or Binding of Feed Rock Shaft9
To Eliminate End Playor Binding of Feed Lifting Rock Shaft9
To Eliminate End Play or Binding of Hook Driving Shaft9
To Eliminate End Play or Binding of Upright Arm Shaft10
To Eliminate End Play or Binding of Horizontal Arm Shaft10
Adjustment for End Play or Binding of Arm Shaft10
To Eliminate Side-Shake or Binding of Needle Bar11
Lower Ball Bushing11
Bushing Set Screws11
Upper Ball Bushing11
To Centralize Needle in Needle Hole in Straight-Stitching Throat Plate12
To Set Needle Bar at Correct Height13
Timing Marks on Needle Bar13
To Check the Position of the Needle to Straight-Stitching Throat Plate14
Needle Hole in Straight-Stitching Throat Plate14
Needle Catalog 202014
To Time the Rotating Hook15
Hook Correctly Timed15
Adjustment for Hook Timing15
To Set the Position of the Hook Point to or from the Needle16
Correct Position of Hook16
Setting the Hook16
Removals and Replacements17
Bobbin Winder17
Stitch Length Regulator17
Hand Wheel and Counterbalance18
Exploded View - Hand Wheel Assembly18
Arm Shaft Counterbalance18
Needle Thread Tension19
Exploded View - Needle Thread Tension19
Tension Disc Assembly19
Stop Washer and Tension Spring19
Throat Plate Position Bracket20
Exploded View - Throat Plate Position Bracket Assembly20
Throat Plate Position Bracket Assembled20
Feed Lifting Rock Shaft21
Feed Rock Shaft Assembly21
Hook Driving Shaft22
Rotating Hook and Position Finger23
Hook Shaft Bevel Gears23
Feed Lifting Rock Shaft Connecting Rod24
Feed Forked Connection24
Feed Forked Connection on Arm Shaft24
Connections Beneath Machine Bed24
Needle Bar25
Presser Bar25
Needle and Presser Bar Assemblies25
Removing Presure Regulating Dial25
Needle Bar Vibrating Bracket26
Needle Thread Take-Up26
Upright Arm Shaft27
Horizontal Arm Shaft27
The Motor28
Removing Motor28
Location of Wires Around Motor28
Light Fixture29
Lamp Shade29
Wirig at Top of Arm29
To Set Index Pins at Correct Height31
To Time the Cam Stack31
Setting Cam Selector Arm Stops32
To Set Bight Amplitude Stop Plates33
Centralizing Needle Bar Driving Arm34
Cam Stack35
Cam Selector Arm Shaft and Followers35
Removing Selector Arm Shaft35
Needle Bar Driving Arm36
Bight Amplitude and Pattern Selector36
Location of Ball Pivot on Diving Arm36
Eccentric Worm Wheel and Worm Wheel Shaft36
To Time the Disc Driving Worm Wheel Assembly38
To Time the Disc Follower Assembly39
To Adjust Needle Bar Driving Arm Plate Disengaging Mechanism40
Disc Follower Assembly41
Exploded View - Disc Follower Assembly41
Disc Driving Worm Wheel42
Bight Amplitude Selector42
Wiring Diagram43
Hints for Adjusters and Mechanics44
Check the Points When a Machine Binds44
To Run-In the Machine44
Index45
Description46

Singer 503 - Feed Lifting Rock Shaft Connecting Rod; Feed Forked Connection; Feed Forked Connection on Arm Shaft; Connections Beneath Machine Bed

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