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Copyright © January, 2010 By South Bend Lathe Co.
WARNING: No portion of this manual may be reproduced in any shape or form
without the written approval of South Bend Lathe Co.
#CR12488 Printed in Taiwan.
www.southbendlathe.com
Troubleshooting
If you need replacement parts, or if you are unsure how to do any of the solutions given here, feel free
to call us at (360) 734-1540.
Symptom
Possible Cause
Possible Solution
The chuck has
hard spots or binds
completely.
1. Jaw is in wrong position.
1. Reinstall jaws in correct order and position on scroll
gear.
2. Lack of lubrication, rust, burr, or
metal shavings inside of chuck.
2. Disassemble, de-burr, clean, and lubricate chuck.
3. Broken tooth on the pinion or the
scroll gear.
3. Disassemble and rebuild chuck.
The workpiece slips
in the jaws.
1. Incorrect jaw or workpiece clamping
position.
1. Reposition jaws and workpiece for maximum scroll
gear and jaw engagement is achieved.
2. Insufficient pinion and scroll gear
torque.
2. Tighten chuck key to 137 ft/lbs.
3. Cutting overload.
3. Reduce cutting depth or feed rate.
4. Chuck is binding before full
clamping is achieved.
4. Disassemble and service/rebuild chuck.
Clamping accuracy
is poor.
1. Workpiece improperly clamped or
jaw is loose or incorrectly seated.
1. Remove jaws, clean, de-burr, and reinstall with jaw
mounting caps crews torqued to 79 ft/lbs.
2. Chuck loose, mounting is off center,
or it is improperly seated.
2. Remove chuck, clean and de-burr mounting, and
reinstall, or machine a new mounting plate.
1
13
10
12
11
6
8
9
7
4
3
5
2
15
14
REF PART #
DESCRIPTION
1
PSB1312001
GREASE FITTING
2
PSB1312002
TOP JAW
3
PCAP115M
BUTTON HD CAP SCR M6-1 X 16
4
PSB1312004
BACK COVER
5
PSB1312005
LOCK PIN
6
PSB1312006
PINION
7
PSB1312007
SCROLL GEAR
8
PSB1312008
CHUCK KEY W/SPRING
9
PSB1312009
COMPRESSION SPRING
10
PSB1312010
CAP SCREW M12-1.75 X 100 BLK C12.9
11
PSB1312011
CAP SCREW M12-1.75 X 25 BLK C12.9
12
PAW10M
HEX WRENCH 10MM
13
PSB1312013
BOTTOM JAW SET OF 3
14
PSB1312014
CHUCK BODY
15
PSB1312015
HEX BOLT M12-1.75 X 45 BLK C12.9
Parts Diagram
Parts List
Please Note:
We included this breakdown for service purposes only. Since many of the parts shown are machined to each
individual chuck, they are not available as replacement items.