Parts Page Reorder No. PD01•41
Effective April, 2001
For Serial No. 6B5500 and Higher
Supersedes PD97•47
Models:
4-1/2"–5" Pistol Grip
50320 — 8,000 RPM, 5/8"-11 Spindle
50321 — 11,000 RPM, 5/8"-11 Spindle
Disc Sander
®
50324 — 11,000 RPM, 3/8"-24 Spindle, 4" Roloc Pad
50325 — 11,000 RPM, 4" Roloc Sanding Kit
®
Air Motor and Machine Parts
Always operate, inspect and maintain this tool in accordance with the Safety Code for portable air tools
(ANSI B186.1) and any other applicable safety codes and regulations. Please refer to Dynabrade’s
Warning/Safety Operating Instructions for more complete safety information.
!
WARNING
8
4
28 N•m Left Hand Threads
17 N•m
T
T
Index Key
No. Part # Description
1 55029 Cover
2 55031 Felt Ring
3 55034 5/8"-11 Thread Adapter
4 55038 Adapter
5 01007 Bearing
24
25
6 01121 Shim (3/pkg.)
7 55026 Bearing Plate
8 50767 Pin (2)
9 01028 Cylinder
10 01010 Spacer
17 N•m
1
2
3
5
6
7
9
10
T
8
11 O
17
18
20
23
1
11 01185 Blade (4/pkg.)
12 55025 Rotor
Left Hand Threads
13 01743 Bearing Plate
14 02649 Bearing
15 96255 Shim
96256 Shim (2)
96257 Shim
16 55032 Governor Cage
17 50399 Governor Weight (2)
18 50938 Governor Pin (2)
19 55054 Governor Valve
20 50470 Pin
21 50940 Spring-8,000 RPM
07169 Spring-11,000 RPM
22 95611 Shim Pack (6/pkg.)
23 50471 Spring Holder
24 53163 Handle Assembly
25 55023 Housing-8,000 RPM
55022 Housing-11,000 RPM
55047 Housing-Roloc®
26 96025 Pin
12
13
14 15
16
T
19
21
22
10 N•m
26
27
30
31
A1
32
34
36
38
39
40
41
A2
A1
34
28
29
33
35
37
27 55024 Grip
28 50936 Pin
42
29 55035 Trigger
Disc Assemblies
30 55043 Trigger Post
31 55052 Valve Stem
32 96069 Spring
23 N•m
T
O
1
33 55039 Bushing
34 50939 O-Ring
43
35 02027 O-Ring (2)
36 55051 Valve Stop (2)
37 55041 Valve
46
44
45
38 96147 O-Ring
39 57075 Cone Muffler
40 57066 Muffler Body
41 56028 Muffler Cap
42 56023 Inlet Bushing
43 50264 Disc Mount
44 50267 Fiber Plate
45 50268 Flange
KEY
Oil: O = Air Lube
O
A
1
Adhesive: A1 = Loctite #609
A2 = Loctite #271
Torque: N•m x 8.85 = In. - lbs.
T
46 50132 4" Dia. Roloc® Pad
Hard Density
50131 4" Dia. Roloc® Pad
Medium Density (Optional)
See inside for Important Operating, Maintenance and Safety Instructions.
Disassembly/Assembly Instructions
Important: Manufacturer’s warranty is void if tool is disassembled before warranty expires.
Warning: The governor in this tool is preset at the factory to maintain the maximum rated speed for the tool, any repairs to this assembly should be
done at the Dynabrade factory. A Motor Tune-Up Kit is available (P/N 96047) to help maintain motor in peek operating condition.
To Disassemble:
1. Remove disc mount assembly or Roloc® Pad and 53163 Side Handle.
2. Place machine housing in soft jaw vise. Important: Be careful not to over tighten vise to prevent damage.
3. Turn 55029 Cover clockwise (left hand threads) and remove.
4. Pull motor assembly from housing.
5. Remove 56028 Muffler Cap. Use a 12 mm hex key to unscrew 57066 Muffler Body and 57075 Cone Muffler from housing.
6. Unscrew 56023 Inlet Bushing and remove.
Motor Disassembly:
1. Secure motor in a vise using flats on 55034 or 55038 Adapter.
2. Screw governor assembly clockwise (left hand threads) to remove from rear of motor.
Note: Any shims between the governor and back of rotor must be kept and replaced during assembly.
3. Press rotor from 02649 Bearing and 01743 Bearing Plate.
4. Press 02649 Bearing from 01743 Bearing Plate.
5
Remove 01028 Cylinder and 01185 Blades (4) from rotor.
6. Secure 55025 Rotor in soft jaw vise.
Unscrew 55034 or 55038 Adapter and remove from rotor.
7
8. Remove 01007 Front Bearing, 55026 Bearing Plate and 01010 Spacer from rotor.
9. Remove 01007 Bearing and any shims from 55026 Bearing Plate.
Valve Disassembly:
1. Drive 96025 Pin through housing and remove valve assembly from housing.
2. Remove 96025 Pin from housing.
3. Remove trigger/valve assembly from housing.
4. Remove first 55051 Valve Stop (Press valve stem from valve stop, be careful not to damage 55041 Valve. A small bearing puller is recommended).
5. Remove 55041 Valve and separate.
6. Press 55042 Valve Stem through the second 55051 Valve Stop.
Motor Assembly:
Important: Be certain all parts are cleaned, properly greased and in good repair before assembling.
1. Install 01007 Front Bearing into 55026 Bearing Plate. (Note: Shimming may be required in upcoming steps).
2. Install 01010 Spacer on rotor.
3. Install bearing assembly onto rotor and spacer.
4. Secure 55025 Rotor in padded vise.
5. Screw 55034 or 55038 Adapter onto 55025 Rotor, torque to 17 N•m/150 in. - lbs.
6. Use a .001" thick feeler gauge to set clearance between the 55026 Bearing Plate and 55025 Rotor.
Note: If shimming is required, use the 01121 Shim Pack accordingly to shim between the 01007 Bearing and 55026 Bearing Plate to obtain a .001"
clearance between the bearing plate and rotor.
7. Install 01185 Blades (4) onto 55025 Rotor. (Note: Blades should be lubricated with Dynabrade Air Lube P/N 95842 or equivalent before installation).
8. Install 01028 Cylinder over 55025 Rotor and onto 55026 Bearing Plate. Be sure to line up 50767 Pin in 55026 Bearing Plate with hole in 01028 Cylinder
Note: Air inlet holes in cylinder should face away from 55026 Bearing Plate.
9. Press 02649 Bearing into 01743 Bearing Plate.
10. Press bearing and bearing plate onto rotor. Be sure 50767 Pin in 01743 Bearing Plate lines up with hole in 01028 Cylinder.
Important: The fit must be snug between bearing plates and cylinder. If to tight, rotor will not turn freely. Rotor must then be lightly tapped at short end
so it will turn freely while still maintaining a snug fit. A loose fit will not achieve the proper pre-load of the motor bearings.
11. Place motor in vise using flats on 55034 or 55038 Adapter.
12. Replace any shims that were between back of rotor and governor, then screw governor assembly counter-clockwise and torque to 10 N•/90 in. - lbs.
Valve Assembly:
1. Slide 55039 Bushing (with o-rings) onto valve stem/trigger assembly.
2. Press 55051 Valve Stop onto 55052 Valve Stem large end out.
3. Install 55041 Valve onto valve stem.
4. Install 96147 O-Ring onto the 55051 Valve Stop.
5. Press 55051 Valve Stop onto valve stem with o-ringed end facing valve. Press valve stop until flush with valve stem end.
6. Reinsert into housing and replace 96025 Pin.
(continued on next page)
3
Disassembly/Assembly Instructions (continued)
To Assemble:
1. Place machine housing in soft jaw vise. Be sure not to over tighten to prevent damage.
2. Install motor assembly into housing.
3. Screw 55029 Cover onto housing turning counterclockwise. Torque to 28 N•m/250 in. - lbs.
4. Replace 57066 Muffler Body.
5. Replace 56028 Muffler Cap onto muffler body.
6. Apply a small amount of #271 Loctite® (or equivalent) to the threads of 56023 Inlet Bushing. Install inlet bushing into housing torque 23 N•m/200 in. - lbs.
7. Lubricate motor by applying 2 or 3 drops of Dynabrade Air Lube P/N 95842 (or equivalent) into air inlet.
8. Complete reassembly by remounting Disc assembly or Roloc® Pad and 53163 Side Handle.
Tool Assembly Complete. Please allow 30 minutes for adhesives to cure before operating tool.
Important: Motor should now be tested for proper operation at 90 PSIG. If motor does not operate properly or operates at a higher RPM than marked on the
tool, the tool should be serviced to correct the cause before use. Before operating, place 2-3 drops of Dynabrade Air Lube (P/N 95842) directly into air inlet
with throttle lever depressed. Operate tool for 30 seconds to determine if tool is operating properly and to allow lubricating oils to properly penetrate motor
Loctite® is a registered trademark of Loctite Corp.
Roloc® is a registered trademark of the 3M Co.
Accessories
Dynaswivel®
50281 - 4-1/2" Diameter Spiralcool® Disc Pad
• Includes 50286 Flange Nut.
• 11,000 RPM maximum.
• Medium density.
Swivels 360° at two locations which
allows an air hose to drop straight to the
floor, no matter how the tool is held.
• 94300 1/4" NPT
• 5/8"-11 female thread.
• Slotted hub draws cool air behind the disc.
Spiral ribs provide contact points and form air
flow channels extending disc life.
Note: Most disc sander models will require
0,1 or 2 spacers (97311) to allow correct
spacing when mounting. An Optional
96038 Spanner Wrench is available to
tighten flange nut on tool.
96047 Motor Tune-Up Kit
• Includes assorted parts to
help maintain and repair motor.
Abrasives
4" Diameter Scotch-Brite Roloc Discs
4-1/2" Ceramic Coated Aluminum Oxide Discs
Flange Mounted / 5/8" Center Hole
Grit
Medium
Coarse
SE
Part No.
90868
90867
90863
Grit
50
80
100
120
Part No. 92052 92053 92054 92055
4" Dia. Regalite Polycut 785C Roloc Discs
Grit
36
60
80
4" Disc Unit = 100 Discs
Unit = 100 Discs
Part No.
92047
92049
92050
Spiralcool is a registered trademark of Spiralcool Co.
Regalite, Scotch-Brite and Roloc are registered trademarks of 3M Co.
Visit Our Web Site: www.dynabrade.com
Email: Customer.Service@Dynabrade.com ®
DYNABRADE, INC., 8989 Sheridan Drive • Clarence, NY 14031-1490 • Phone: (716) 631-0100 • Fax: 716-631-2073 • International Fax: 716-631-2524
DYNABRADE EUROPE S.àr.l.,
©DYNABRADE, INC., 2001
Zone Artisanale • L-5485 Wormeldange—Haut, Luxembourg • Telephone: 352 76 84 94 1 • Fax: 352 76 84 95 1
PRINTED IN USA
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