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)
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