Motor Assembly/Disassembly Instructions
Important: Manufacturer’s warranty is void if tool is disassembled before warranty expires.
These instructions are for use in conjunction with Part Number 57260 Repair Kit, which includes special tools for proper disassembly/assembly of
tool. A complete Tune-Up Kit, Part Number 96122 is available which includes assorted parts to help maintain and repair motor.
To Disassemble:
1.
Invert machine and secure in vise, using
57092
Collar (supplied in
57260
Repair Kit) or padded jaws.
2.
Remove sanding pad with
50679
Open-End Wrench (supplied with sander).
3.
Using a 2mm hex key remove the
96166
Set Screw.
4.
Insert
56058
Lock Ring Wrench (supplied in
57260
Repair Kit) into corresponding tabs of lock ring and unscrew. Motor may now be lifted out
for service.
Important: Do not remove the rubber seals from the motor housing.
5.
Remove
95626
Retainer Ring. Motor may now be disassembled.
6.
Remove the rear plate assembly by securing the
54631
Cylinder in a standard 2 inch bearing separator or use a standard bearing puller gripped on the
cylinder inlet/exhaust area. Push the motor shaft balancer through the bearing. Remove cylinder, rotor, vanes and key.
7.
Remove
54630
Front Plate and press off
02695
Front Motor Bearing, using a 2 inch bearing separator and a #2 arbor press.
8.
Remove
01206
Bearing from the
54629
Rear Bearing Plate.
9.
Disassemble the balancer assembly as follows:
a.)
Remove
95630
Snap Ring. Screw the threaded portion of the
56056
Bearing Puller (supplied in
57260
Repair Kit) into the
57069
Balancer Shaft.
Note:
Heat the outside of the motor shaft balancer to approximately 200° F. Now, using the slider weight, pull the assembly out.
b.)
Press off
56052
Bearing and remove loose parts.
10.
If during step 8, the
56052
Bearing remains in the motor shaft balancer, it can be removed by heating the shaft balancer again and using the
56081
Bearing Chuck,
56080
Bearing Puller Stud,
95334
Hex Nut connected to the
56056
Balancer Bearing Puller Assembly. Remove the bearing.
To Assemble:
Important:
Be certain parts are clean and in good repair before assembling.
1.
Assemble the balancer assembly as follows:
a.)
Install
95630
Snap Ring onto
57069
Balancer Shaft. Install
95628
Shield with convex face toward hex
of balancer shaft.
b.)
Install
56053
Bearing Seal.
Note:
Be certain seal is pressed completely over shaft step.
c.)
Apply a slight amount of #271 Loctite
®
(or equivalent) to inside diameter of the
56052
Bearing and the
outside diameter of the
57069
Balancer Shaft.
d.)
Press
56052
Bearing, with seal side toward hex of balancer shaft, up to shaft step using
57091
Bearing
Press Tool (supplied in
57260
Repair Kit) (Drawing 1).
2.
Place the motor shaft balancer in a soft jaw vise with large end up.
3.
Apply a slight amount of #271 Loctite
®
(or equivalent) on the outside diameter of the
56052
Bearing and slide
the balancer shaft assembly into the motor shaft balancer until
56052
Bearing is firmly seated at bottom.
Squeeze
95630
Snap Ring into groove in motor shaft balancer to complete the assembly. Remove from vise.
4.
Press
02695
Bearing onto the motor shaft balancer down to the shoulder using
57091
Bearing Press
Tool (Drawing 2).
5.
Install
54630
Front Bearing Plate onto
02695
Bearing and check for smooth rotation (Drawing 3).
6.
Place
54673
Rotor Key,
54671
Rotor, and
54674
Blades onto shaft.
Note:
Be certain rotor “floats” easily on the shaft. Because the design of this
motor uses a “floating rotor”, there is no need to set or adjust gap between the rotor and the end plates.
7.
Place
54631
Cylinder over rotor. The “short” line-up pin goes toward the
54630
Front Bearing Plate.
8.
Install
01206
Bearing into
54629
Rear Bearing Plate. Place bearing and bearing plate over shaft and “long” end of line-up pin and press fit
in place (Drawing 4).
9.
Install
95626
Retaining Ring concave side toward motor.
Note:
Be certain that retaining ring is completely pressed down onto its groove on the shaft.
10.
Grease the rubber seals inside the housing using a small amount of multi purpose grease or petroleum jelly.
Note:
Be certain that rubber seals in housing have not pulled out of their seat during disassembly. If this has happened re-seat seals by pushing them
until they are flush with inside diameter.
(continued on next page)
Balancer Shaft
Shaft Step
Bearing Seal and
Bearing Shield
Drawing 1
Balancer Shaft
Assembly
Motor Shaft
Balancer
02695
Bearing
57091
Bearing Press Tool
Drawing 2
57091
Bearing Press Tool
Balancer Shaft
Assembly
Motor Shaft
Balancer
02695
Bearing
Front Bearing Plate
Drawing 3
57091
Bearing Press Tool
Front Bearing Plate
(with
02695
Bearing)
54629
Rear Bearing Plate
(with
01206
Bearing)
Cylinder Assembly
(w/ rotor and vanes)
Line-Up Pin
Drawing 4
56052
Bearing
57091
Bearing Press Tool
Motor Shaft Balancer
Balancer Shaft
Assembly
3
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Buy parts on line at https://Dynashop.co.uk/ for all things Dynabrade
