Dynabrade Mini-Dynorbital Silver Supreme 69503 Handbuch für Sicherheit, Betrieb und Wartung - Seite 5

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Motor Assembly/Disassembly Instructions - Mini-Dynorbital

Important: Manufacturers warranty is void if tool is disassembled before warranty expires.

A Repair Kit P/N 57525, is available which includes special repair tools for correct disassembly/assembly of the sander.

To Disassemble:

1. Disconnect sander from air supply.

2. Invert the sander, and place the 57092 Repair Collar (supplied in the 57525 Repair Kit) around the housing and secure in a vise. Padding

can be used on the vise jaws to protect the housing. Important: Do not over tighten the sander in the vise. If the sander is held too tight the

removal of the lock ring and air motor will be difficult.

3. Remove back-up pad.

4. Insert 56058 Lock Ring Tool (supplied in 57525 Repair Kit) into the corresponding tabs of lock ring. Loosen the 59058 Lock Ring

turning it counterclockwise.

5. Remove the 59058 Lock Ring from the air motor assembly.

6. Fasten a 2 in. bearing separator (P/N 96346 available) around the 69350 Cylinder just below the 57891 Rear Bearing Plate. Place the air motor

assembly in a #2 arbor press (P/N 96232 available) so that the separator is resting on the table of the arbor press and with the balancer pointing down.

7. Use a flat nose 3/16" dia. drive punch as a press tool. Place it against the small end of the shaft balancer and push the shaft out of the

upper 58368 Bearing.

8. Remove the rotor, vanes and rotor key from the shaft balancer.

9. Again fasten the 2 in. bearing separator between 58368 Bearing and the top of the balancer. Rest the separator on the table of the arbor press

and push the shaft balancer out of the 58368 Bearing. Remove 59057 "Top Hat" Seal and 59083 Felt from 57893 Front Bearing Plate.

10. Disassemble the balancer assembly as follows:

a.) Place shaft balancer assembly into a soft jaw vise. Using a thin screwdriver, pick out the end of 95613 Retaining Ring and remove. This will

loosen the balancer assembly.

b.) Screw the threaded portion of the 54121 Bearing Puller onto 95679 1/4"-20 Stud (supplied in 57525 Repair Kit) and heat the outside of the

shaft balancer to approximately 200° F (approximately 10 seconds with a propane torch). Now, using the slider weight, pull the

assembly out.

c.) Remove 95558 Retaining Ring. Press off 50722 Bearings and remove loose parts.

Important: Clean and inspect all parts for defects before assembling.

To Assemble:

1. Prepare the 50722 Bearings and install them onto the 54145 Retainer Assembly.

a.) Remove 3 of the 4 seals from the 50722 Bearings. Use a clean dry cloth to wipe away all grease from the inside and outside diameters of

the bearings.

b.) Install 95612 Bearing Shield onto the 54145 Retainer Assembly. Face the convex side of the shield toward the pad-mounting end of the retainer.

c.) Use the 95679 ¼"-20 Stud or the 6.35 mm end of the 96212 Repair Tool to support the end of retainer shaft that is up inside the locking-type

pad-mounting shells. Position the Stud or the Repair Tool on the table of the 96232 Arbor Press.

d.) First, install the bearing with the seal. Face the sealed side of the bearing toward the 95612 Bearing Shield. Use the raised center of the 96240

Bearing Press Tool to press the bearing onto the retainer assembly. Install the second bearing in the same manner.

e.) Install the 95558 Retaining Ring onto the retainer assembly.

2. Secure the 54081 shaft balancer in a vise with aluminum or bronze jaws with the large end pointing up.

3. After surfaces have been properly cleaned and primed, apply and spread 1 drop of Loctite #271 (or equivalent) onto the outside diameter of the

50722 Bearings and install the 54145 Retainer Assembly with bearings into the shaft balancer.

4. Install the 95613 Retaining Ring between the 95612 Bearing Shield and the pad-mounting end of the retainer. Squeeze the 95613 Retaining Ring into

the groove in the shaft balancer.

5. Place the 59083 Felt into the 59057 "Top Hat" Seal.

6. Install the felt and the "Top Hat" Seal onto the shaft balancer so that they are centered as is shown in Drawing 1.

7. Use the small end of the 57091 Bearing Press Tool and the 96232 Arbor Press to install the 58368 Bearing onto the shaft balancer as

shown in Drawing 2.

8. Install the 57893 Front Bearing Plate onto the shaft balancer, fitting it to the bearing, felt, and "Top Hat" Seal as is shown in Drawing 3.

9. Install the rotor key and the rotor onto the shaft balancer.

(continued on next page)