Dynabrade 50324, 50325, 000 RPM, 50321, 50320 User Manual

Parts Page Reorder No. PD01•41

Effective April, 2001

Supersedes PD97•47

Models:

50320 — 8,000 RPM, 5/8"-11 Spindle
50321 — 11,000 RPM, 5/8"-11 Spindle
50324 — 11,000 RPM, 3/8"-24 Spindle, 4" Roloc

®

Pad

50325 — 11,000 RPM, 4" Roloc

®

Sanding Kit

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.

Air Motor and Machine Parts

4-1/2"–5" Pistol Grip

Disc Sander

See inside for Important Operating, Maintenance and Safety Instructions.

Oil: O1= Air Lube
Adhesive: A

1

= Loctite #609

A2= Loctite #271

Torque: N•m x 8.85 = In. - lbs.

A

T

O

KEY

1 55029 Cover
2 55031 Felt Ring
3 55034 5/8"-11 Thread Adapter
4 55038 Adapter
5 01007 Bearing
6 01121 Shim (3/pkg.)
7 55026 Bearing Plate
8 50767 Pin (2)

9 01028 Cylinder
10 01010 Spacer
11 01185 Blade (4/pkg.)
12 55025 Rotor
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
27 55024 Grip
28 50936 Pin
29 55035 Trigger
30 55043 Trigger Post
31 55052 Valve Stem
32 96069 Spring
33 55039 Bushing
34 50939 O-Ring
35 02027 O-Ring (2)
36 55051 Valve Stop (2)
37 55041 Valve
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
46 50132 4" Dia. Roloc

®

Pad

Hard Density

50131 4" Dia. Roloc

®

Pad

Medium Density

(Optional)

Index Key

No. Part # Description

5

21

10

17

8

12

28 29

30

43

44

45

32

33

34

353637

46

38

13 14

20

24

25

18

8

7

9

6

15 19 21 22

26
27

39

40

41

23

For Serial No. 6B5500 and Higher

Disc Assemblies

A

2

A

1

A

1

O

1

O

1

23 N•m

T

17 N•m

T

17 N•m

T

28 N•m

T

10 N•m

T

42

11

31

34

4

3

Left Hand Threads

Left Hand Threads

16

!

WARNING

Important Operating, Maintenance and Safety Instructions

Carefully read all instructions before operating or servicing any Dynabrade®Abrasive Power Tool.

Warning: Hand, wrist and arm injury may result from repetitive work motion and overexposure to vibration.
Important: All Dynabrade Rotar y Vane air tools must be used with a Filter-Regulator-Lubricator to maintain all warranties.

Operating Instructions:

Warning: Eye, face, respiratory, sound and body protection must be worn while operating power tools. Failure to do so may result in serious injury or death.

Follow safety procedures posted in workplace.

1. With power source disconnected from tool, securely fasten abrasive/accessory on tool.

2. Install air fitting into inlet bushing of tool. Important: Secure inlet bushing of tool with a wrench before attempting to install the air fitting to avoid

damaging valve body housing.

3. Connect power source to tool. Be careful not to depress throttle lever in the process.

4. Check tool speed with tachometer. If tool is operating at a higher speed than the RPM marked on the tool or operating improperly, the tool should be

serviced to correct the cause before use.

Maintenance Instructions:

1. Check tool speed regularly with a tachometer. If tool is operating at a higher speed than the RPM marked on the tool, the tool should be serviced to
correct the cause before use.

2. Some silencers on air tools may clog with use. Clean and replace as required.

3. All Dynabrade Rotary Vane air motors should be lubricated. Dynabrade recommends one drop of air lube per minute for each 10 SCFM (example: if

the tool specifications state 40 SCFM, set the drip rate of your filter-lubricator at 4 drops per minute)
Dynabrade Air Lube (P/N 95842: 1 pt. 473 ml.) is recommended.

4. An Air Line Filter-Regulator-Lubricator must be used with this air tool to maintain all warranties. Dynabrade recommends the following: 11405Air Line
Filter-Regulator-Lubricator — Provides accurate air pressure regulation, two-stage filtration of water contaminants and micro-mist lubrication of
pneumatic components. Operates 40 SCFM @ 100 PSIG has 3/8" NPT female ports.

5. Use only genuine Dynabrade replacement parts. To reorder replacement parts, specify the Model #, Serial #, and RPM of your machine.

6. A Motor Tune-Up Kit (P/N 96047)is available which includes assorted parts to help maintain motor in peek operating condition.

7. Mineral spirits are recommended when cleaning the tool and parts. Do not clean tool or parts with any solvents or oils containing acids, esters,

keytones, chlorinated hydrocarbons or nitro carbons.

2

(PD01•41)

One Y ear Warranty

Following the reasonable assumption that any inherent defect which might prevail in a product will become apparent to the user within one year from the date
of purchase, all equipment of our manufacture is warranted against defects in workmanship and materials under normal use and service. We shall repair or
replace at our factory, any equipment or part thereof which shall, within one year after delivery to the original purchaser, indicate upon our examination to have
been defective. Our obligation is contingent upon proper use of Dynabrade tools in accordance with factory recommendations, instructions and safety prac­tices. It shall not apply to equipment which has been subject to misuse, negligence, accident or tampering in any way so as to affect its normal performance.
Normally wearable parts such as bearings, sanding pads, rotor blades, etc., are not covered under this warranty.

• Important: User of tool is responsible for following accepted safety codes such as those published by the American National Standards Institute (ANSI).

• Operate machine for one minute before application to workpiece to determine if machine is working properly and safely before work begins.

• Always disconnect power supply before changing abrasive/accessory or making machine adjustments.

• Inspect abrasives/accessories for damage or defects prior to installation on tools.

• Please refer to Dynabrade’s Warning/Safety Operating Instructions Tag (Reorder No. 95903) for more complete safety information.

• Warning: Hand, wrist and arm injury may result from repetitive work, motion and overexposure to vibration.

Notice

All Dynabrade motors use the highest quality parts and metals available and are machined to exacting tolerances. The failure of quality pneumatic motors can most
often be traced to an unclean air supply or the lack of lubrication. Air pressure easily forces dirt or water contained in the air supply into motor bearings causing
early failure. It often scores the cylinder walls and the rotor blades resulting in limited efficiency and power. Our warranty obligation is contingent upon proper use
of our tools and cannot apply to equipment which has been subjected to misuse such as unclean air, wet air or a lack of lubrication during the use of this tool.

Safety Instructions:

Products offered by Dynabrade should not be converted or otherwise altered
from original design without expressed written consent from Dynabrade, Inc.

Model Motor Motor Air Inlet Sound Air Flow Rate Air Pressure Spindle Weight Length Height

Number HP (W) RPM Thread Level CFM/SCFM (LPM) PSIG (Bars) Thread Pound (kg) Inch (mm) Inch (mm)

50320 .58 (433) 8,000 1/4 NPT 72 dB(A) 4/30 (850) 90 (6.2) 5/8"-11 male 2.2 (1.0) 6-5/8 (168) 5-5/8 (143)
50321 .75 (559) 11,000 1/4 NPT 72 dB(A) 4/32 (906) 90 (6.2) 5/8"-11 male 2.2 (1.0) 6-5/8 (168) 5-5/8 (143)
50324 .75 (559) 11,000 1/4 NPT 72 dB(A) 4/32 (906) 90 (6.2) 3/8"-24 female 2.2 (1.0) 6-5/8 (168) 5-5/8 (143)
50325 .75 (559) 11,000 1/4 NPT 72 dB(A) 4/32 (906) 90 (6.2) 3/8"-24 female 2.2 (1.0) 6-5/8 (168) 5-5/8 (143)

Additional Specifications: Hose I.D. Size 3/8" (10 mm)