Parts Page Reorder No. PD05•05
Effective January, 2005
Supersedes PD02•40
.7Hp/7˚/Heavy Duty/Gearless
Models:
52410 – 15,000 RPM
52411 – 18,000 RPM
52412 – 20,000 RPM
3" Disc Sander
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.
Index Key
No. Part
Description
34 N•m
17 N•m
T
T
1
2
50187 3" Dynapad
Exhaust Cover
01734 15,000 RPM
01738 18,000 RPM
01748 20,000 RPM
15
16
3
4
5
6
7
8
9
01744 Silencer
01708 Rotor Nut
01007 Bearing
01121 Shim (3/pkg.)
01008 Plate
1
2
3
4
5
6
7
8
50767 Guide Pin (2)
01010 Spacer
10 01028 Cylinder
11 55025 Rotor
12 01185 Blade (4/pkg.)
13 01743 Bearing Plate
14 02649 Bearing
15 53163 Handle Assembly
16 01739 Motor Assembly
17 01437 Plug
Left Hand
Threads
A
9
10
11
12
8
13
14
8
O
1
18
19
17
45 N•m
T
18 01548 Gasket
19 01461 Lock Nut
20 01558 Collar
20
21 Housing
01895 Model - 52410
01896 Model - 52411
01897 Model - 52412
23
A
O
1
24
8
22 95558 Retaining Ring
22
23 01448 Throttle lever
01462 Safety Lock Lever
24 12132 Pin
25 01449 Valve Stem
26 95730 O-Ring
Right Hand
Threads
23 N•m
29
30
31
32
T
27 01024 O-Ring
28 01469 Speed Regulator Assy.
29 01464 Seal
30 01472 Tip Valve
31 01468 Spring
32 01494 Inlet Bushing
25
A
21
8
26
27
28
KEY
Oil: O1 = Air Lube
O
A
Adhesive: A8 = Loctite #567
Torque: N•m x 8.85 = In. - lbs.
T
See reverse side for Accessories and Important Operating, Maintenance and Safety Instructions.
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Disassembly/Assembly Instructions – 3" Disc Sander .7 Hp/7˚ Gearless Front Exhaust
Important: The Manufacturer's warranty is void if the tool is disassembled before the warranty expires.
Notice: All of the special repair tools referenced in these instructions can be ordered from Dynabrade. Please refer to this parts page for the
proper part identification.
Motor Disassembly:
1. Disconnect the tool from the air supply.
2. Carefully secure the 01739 Housing in a vise with aluminum or bronze jaws. Hold the back portion of the housing opposite the exhaust cover so as not
to crush the housing.
3. Remove the 50187 3" Dynapad.
4. Use a 1-1/2" open end or an adjustable wrench to remove the exhaust cover by turning it counterclockwise and remove the 01744 Silencer.
5. Pull the air motor out of the 01739 Housing.
6. Remove the 01739 Housing from the vise.
7. Fasten the 96346 Bearing Separator around the portion of the 01028 Cylinder that is closest to the 01743 Bearing Plate.
8. Place the motor with the separator attached on the table of the 96232 Arbor Press and using a 3/16" dia. flat end drive punch as a press tool push the
rear stem of the 55025 Rotor out of the 02649 Bearing.
9. Use the 96213 Bearing Removal tool and the arbor press to remove the 02649 Bearing from the 01743 Bearing Plate.
10. Secure the vane slot portion of the 55025 Rotor in a vise with aluminum or bronze jaws so that the threaded stem of the rotor is pointing up.
11. Use an adjustable wrench to remove the 01708 Rotor Nut from the rotor by turning it counterclockwise.
12. Slip the 01008 Bearing Plate, 01007 Bearing, shims and 01010 Spacer from the rotor.
Motor Disassembly Complete.
Valve Disassembly:
1. Position the valve housing in a vise so that the air inlet is pointing up.
2. Hold the 01494 Inlet Bushing stationary with an adjustable wrench while removing the air fitting.
3. Use a wrench to remove the air inlet bushing from the valve housing.
4. Remove the 01468 Spring, 01472 Tip Valve, and 01464 Seal from the valve housing.
5. Use a 2.5mm drive punch to remove the 12132 Pin and the throttle lever from the valve housing.
6. Remove the 95558 Retaining Ring with retaining ring pliers.
7. Push the 01469 Speed Regulator Assembly out of the housing and remove the 01449 Valve Stem.
Valve Disassembly Complete.
Valve Assembly:
Important: Clean and inspect all of the parts for wear before assembling.
1. Install the 01469 Speed Regulator Assembly (includes o-rings) into the valve housing and secure it in place with the 95558 Retaining Ring.
2. Insert the 01449 Valve Stem so that the hole in the valve stem is visible through the air inlet opening.
3. Install the 01464 Seal into the air inlet opening of the valve housing so that it lays flat.
4. Use a needle to install the 01472 Tip Valve into the air inlet opening so that the metal pin of the tip valve passes through the hole in the valve stem.
5. Place the smaller end of the 01468 Spring into the air inlet opening so that it fits onto the back of the 01472 Valve Stem.
6. Apply a small amount of the Loctite #567 (or equivalent) to the threads of the 01494 Inlet Bushing and install it into the valve housing.
(Torque to 23 N•m/200 in.- lbs.)
7. Install the throttle lever and secure it in place with the 12132 Pin.
8. Hold the 01494 Inlet Bushing stationary with an adjustable wrench while installing the air fitting.
Valve Assembly Complete.
Motor Housing Assembly:
1. Secure the vane slot portion of the 55025 Rotor in a vise with aluminum or bronze jaws so that the threaded stem of the rotor is pointing up.
2. Install the 01010 Spacer onto the rotor.
3. Select .003 (.08mm) thickness in shims from the 01121 Shim Pack and install these into the 01008 Bearing Plate.
4. Install the 01007 Bearing into the 01008 Bearing Plate.
5. Slip this assembly down onto the 55025 Rotor and secure it in place with the 01708 Rotor Nut. (Torque to 17 N•m/150 in.- lbs)
6. Check the rotor/plate clearance with a .001 (0.03) feeler gage. The clearance should be .001-.0015 (0.03-0.04mm). If the rotor/plate clearance needs
adjustment, repeat steps 3-6 and shim as required.
7. Once the proper rotor/plane clearance is achieved, install the 01185 Blades (4) that have been lubricated with the 95842 Dynabrade Air Lube
(10W/NR or equivalent).
8. Install the 01028 Cylinder so that the air inlet openings in the 01743 Bearing Plate will align with the air inlet opening in the cylinder.
9. Use the 96240 Bearing Press Tool and the 96232 Arbor Press to install the 02649 Bearing into the 01743 Bearing Plate. Position the press tool so that
it is resting against the outer race of the bearing when pressing the bearing into the bearing plate.
10. Use the opposite end of the 96240 Bearing Press tool to install the bearing/plate assembly onto the 55025 Rotor. Position the press tool so that it is
resting against the inner race of the bearing when pressing the bearing/plate assembly onto the rotor. Important: Press the assembly together only
until the 01743 Bearing Plate comes in contact with the 01028 Cylinder. This should create a snug fit between the bearing plates and the cylinder.
A loose fit will not achieve the proper preload of the motor bearings.
11. Install the air motor into the 01739 Housing.
(continued on next page)
3
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Disassembly/Assembly Instructions – 3" Disc Sander (continued)
12. Carefully secure the 01739 Housing in vise with aluminum or bronze jaws. Hold the back portion of the housing opposite the exhaust cover so as not
to crush the housing.
13. Install the 01744 Silencer into the exhaust cover.
14. Apply a small amount of Loctite® #567 to the threads of the 01739 Housing and using a 1-1/2" or an adjustable wrench, install the exhaust cover.
(Torque to 34 N•m/300 in.- lbs.)
15. Install the 50187 3" Dynapad.
Motor Assembly Complete. Tool Assembly Complete. Please allow 30 minutes for adhesives to cure before operating tool.
Throttle Lever Positioning:
1. Secure the holding flats of the valve housing in a vise with aluminum or bronze jaws so that the 01739 Housing is pointing up.
2. Slip the 01558 Collar down onto the valve housing to expose the 01461 Lock Nut.
3. With a firm hold on the 01739 Housing, use a 34mm or an adjustable wrench to turn the 01461 Lock Nut counterclockwise to loosen the
01739 Housing from the valve housing.
4. Orient the throttle lever to the operators desired grip and positioning. Note: Allow for additional rotation of the 01739 Housing as the
01461 LocK Nut is tightened.
5. With a firm hold on the 01739 Housing to reduce its rotation, use a 34mm or an adjustable wrench to tighten the 01461 Lock Nut.
(Torque to 45 N•m/400 in.- lbs.)
Loctite® is a registered trademark of the Loctite Corp.
Optional Accessories
Dynaswivel®
96045 Motor Tune-Up Kit:
Swivels 360° at two locations which
allows an air hose to drop straight to
the floor, no matter how the tool is held.
•
Includes assorted parts to help maintain
and repair motor.
•
•
94300 1/4" NPT (Composite)
95460 1/4" NPT (Aluminum)
Dynabrade Air Lube
96232 (#2) Arbor Press
•
•
•
•
Formulated for pneumatic equipment.
Absorbs up to 10% of its weight in water.
Prevents rust and formation of sludge.
•
This arbor press is ideal for the
disassembly and assembly of air motors.
Keeps pneumatic tools operating longer
with greater power and less down time.
95842: 1pt. (473 ml)
95843: 1gal. (3.8L)
96346 Bearing Separator
•
Use the separator to remove gears
and bearings.
96213 Bearing Removal Tool
•
this tool is designed to pass through the
I.D. of the bearing plate and push against
the I.D. of the bearing.
96240 Bearing Press Tool
95281 – 19mm open-end
•
This tool is designed to safely press a
bearing into a bearing plate and onto a shaft.
DYNABRADE®
Visit Our Web Site: www.dynabrade.com
Email: [email protected]
Phone: (716) 631-0100 Fax: 716-631-2073
DYNABRADE, INC., 8989 Sheridan Drive
•
Clarence, NY 14031-1490
•
•
•
International Fax: 716-631-2524
DYNABRADE EUROPE S.àr.l.,
Zone Artisanale
•
L-5485 Wormeldange—Haut, Luxembourg Telephone: 352 76 84 94 1
•
•
Fax: 352 76 84 95 1
©DYNABRADE, INC., 2005
PRINTED IN USA
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