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Operating Instructions and Parts Manual
20-inch Disc Grinder
Models J-4421-2 and J-4421-4
WALTER MEIER (Manufacturing) Inc.
427 New Sanford Road
LaVergne, Tennessee 37086
Part No. M-577010
Ph.: 800-274-6848
Revision B 09/2013
www.waltermeier.com
Copyright © 2013 Walter Meier (Manufacturing) Inc.
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Related Manuals for Jet J-4421-2
Summary of Contents for Jet J-4421-2
- Page 1 This .pdf document is bookmarked Operating Instructions and Parts Manual 20-inch Disc Grinder Models J-4421-2 and J-4421-4 WALTER MEIER (Manufacturing) Inc. 427 New Sanford Road LaVergne, Tennessee 37086 Part No. M-577010 Ph.: 800-274-6848 Revision B 09/2013 www.waltermeier.com Copyright © 2013 Walter Meier (Manufacturing) Inc.
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Page 2: Warranty And Service
Walter Meier Authorized Service Centers can authorize warranty repair, assist you in obtaining parts, or perform routine maintenance and major repair on your JET® tools. For the name of an Authorized Service Center in your area call 1-800-274-6848. -
Page 3: Table Of Contents
2.0 Table of contents Section Page 1.0 Warranty and Service ............................. 2 2.0 Table of contents ............................3 3.0 Warnings ................................ 4 3.1 Machinery General Safety Warnings ......................4 3.2 General Electrical Cautions ........................5 ... -
Page 4: Warnings
- Always keep machine guards in place. and full benefits from your machine. Used properly, - Always put start switch in “OFF” position before JET machinery is among the best in design and plugging in machine. safety. However, any machine used improperly can When using machine: be rendered inefficient and unsafe. -
Page 5: General Electrical Cautions
by using padlocks, master switches, or by 19. Know the tool you are using; its application, removing starter keys. limitations, and potential hazards. 3.2 General Electrical Cautions This machine should be grounded in accordance sizes for branch circuits or electrical extension with the National Electrical Code and local codes cords according... -
Page 6: General Specifications
4.0 General Specifications The JET Model J-4421 20-inch diameter disc grinder is a high production, rapid stock removal tool. The stock removal rate is controlled by the amount of pressure the operator applies to the work piece and the grit of the abrasive sheet mounted on the drive disc. -
Page 7: Machine Set-Up
5. Use the two leveling bolts on the rear of the 5.0 Machine set-up base to level the grinder. Shim under the anchor positions as needed to level the 5.1 Grinder set-up grinder. 1. Uncrate the grinder and remove it from its 6. -
Page 8: To Correct Disc Rotation
4. Reestablish power to the service branch for 3. Locate the cut-out coil which is under the the grinder. switch. See Figure 3 for position and removal/installation motion. 5. Turn on the grinder using the ON/OFF switch and observe the direction of rotation of the drive disc. -
Page 9: Operating Instructions
1. Always be certain the wheel guard is positioned over the disc edge. Materials abraded from your workpiece will be hurled off the wheel if the wheel guard is not in position. 2. Always allow time for the disc to come fully up motor speed before... -
Page 10: On/Off Switch
7.2 ON/OFF Switch Note: Never expose more of the grinding disc than necessary to do an effective job of grinding the The ON/OFF switch is located on a post on the left workpiece. The more disc you have exposed, the hand side of the grinder. -
Page 11: Using The Miter System
Note: The table protractor, while accurate, may not give you the precision required for highly accurate grinding. For these cases requiring high precision angles, use a machinist's protractor to establish the required angle between table and disc as shown in Figure 10. -
Page 12: Maintenance Procedures
Silicon carbide While discs may be available for 20 inch grinding, this material is not recommended for use on the ModelJ-4421 because a water coolant/lubricant is typically required for effective use of this material. Application tip While the 20 inch grinder can mount the full range of grits available –... -
Page 13: Removing And Replacing Motor And/Or Drive Disc
CERTAIN YOU HAVE TURNED OFF POWER TO THE MOTOR AND HAVE LOCKED OUT POWER TO THE BRANCH ON WHICH YOU WILL BE 9.2 Removing and replacing motor WORKING. JET recommends that a licensed and/or drive disc electrician perform all electrical service work for this grinder. -
Page 14: Lubrication
22. If the drive disc does not have a grinding disc 10.0 Lubrication installed on it – install a disc now, using the instructions in sect. 9.1 Removing and Since the grinder operates in an environment of replacing grinding discs. high amounts of dust and grit, most lubrication would simply pick up the grit and cause increased 23. -
Page 15: Motor And Trunnion - Exploded View
11.1.1 Motor and Trunnion – Exploded View... -
Page 16: Motor And Trunnion - Parts List
11.1.2 Motor and Trunnion – Parts List Index No Part No Description Size 1 ....J-5644311 ...... Base ......................1 2 ....5644321 ......Column ..................... 1 3 ....J-5644331 ...... Support Bracket ..................1 4 ....5644341 ......Hex Cap Bolt ............3/8"-16 × 1-3/4" ..... 4 5 .... - Page 17 Index No Part No Description Size 61 ....5644971 ......Spring Pin ............Ø4 x 20 mm ....1 62 ....5644981 ......Shaft ......................1 63 ....5644991 ......Hex Socket Set Screw ........5/16"-18 x 3/4" ....2 64 ....
- Page 18 Index No Part No Description Size 119-5 ..5646003 ......Pointer ...................... 1 119-6 ..5646004 ......Roll Pin ............... Ø3 x 6 mm ....1 119-7 ..5646005 ......Stop Link ....................1 119-8 ..TS-0267021 ....Socket Set Screw ..........1/4"-20 x 1/4" ....1 119-9 ..
- Page 20 WALTER MEIER (Manufacturing) Inc. 427 New Sanford Road LaVergne, Tennessee 37086 Phone: 800-274-6848 www.jettools.com www.waltermeier.com...