Dynabrade 53281 Guide

Rebel Series Grinders
7" & 9" Diameter, Right Angle
PD17-14
September, 2017
Safety, Operation and Maintenance – Save This Document and Educate All Personnel
WARNING
Read and understand this tool manual before operating your air tool. Follow all safety rules for the protection of operating personnel as
well as adjacent areas. Always operate, inspect and maintain this tool in accordance with the American National Standards Institute (ANSI).
Safety Requirements for abrading materials with coated abrasive systems – ANSI B7.1, Compressed Air and Gas Institute (CAGI) Safety
Code for Portable Air Tools – B186.1, Code of Federal Regulation – CFR 29 Part 1910, International Organization for Standardization (ISO)
Hand Held Non-Electric Power Tools – Safety Requirements and applicable State and Local Regulations.
Find The Most Current Offering of Support Documents and Accessories at www.Dynabrade.com
Read and understand tool manual before work starts
to reduce risk of injury to operator, visitors, and tool.
Ear protection to be worn when exposure to sound,
exceeds the limits of applicable Federal, State or
local statues, ordinances and/or regulations.
Practice safety requirements.Work alert, have proper
attire, and do not operate tools under the influence
of alcohol or drugs.
Air line hazard, pressurized supply lines and flexible
hoses can cause serious injury. Do not use damaged,
frayed or deteriorated air hoses and fittings.
Eye protection must be worn at all times, eye
protection to conform to ANSI Z87.1.
Respiratory protection to be used when exposed to
contaminants that exceed the applicable threshold
limit values required by law.
Some dust created by sanding, grinding, drilling, and other construction activities contain chemicals known to cause cancer, birth defects
or other reproductive harm. Some examples of these chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and cement and other masonry products
• Arsenic and chromium from chemically treated lumber
Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well
ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.
GRINDER
DO NOT USE Tool for Anything Other Than Its Intended Applications.
Training: Proper care, maintenance, and storage of your air tool will maximize tools performance and reduce chance for accident.
Employer's Responsibility: Provide operators with safety instructions and training for safe use of tools and accessories.
Report to Your Supervisor any Condition of the Tool, Accessories or Operation you Consider Unsafe.
Tool Intent: Rebel Series Grinders are ideal for material removal using depressed center grinding wheels, or abra-
sive flap discs. Follow Rebel Series Grinders abrasive mounting instructions included with the tool.
SAFETY and OPERATING INSTRUCTIONS
Carefully Read and Understand the General
and Grinder sections found in Tool Safety and
Operating Guidelines (PN00001676) Before
Handling or Using Tool.
Carefully Read all instructions before operating or servicing
any Dynabrade
®
Abrasive Power Tool. Products offered by
Dynabrade are not to be modified, converted or otherwise
altered from the original design.
Model Wheel Dia. RPM Autobalancer Hp
53281 7" (180 mm) 8,500
Ye s 2.8
53283 9" (230 mm) 6,500

2
MAINTENANCE INSTRUCTIONS
Important: To keep tool safe, a Preventative Maintenance Program is
recommended. The program should include inspection of the tool and all
related accessories and consumables, including air lines, pressure regulators,
filters, oilers, etc. (refer to CAGI B186.1 for additional maintenance
information). If accessory or tool breakage occurs, investigate failure to
determine the cause and correct before issuing tool for work. Use the following
schedule as a starting point in developing a Preventative Maintenance
Program. If tool does not operate properly (RPM, vibration, start/stop) after
these scheduled checks or at any time, the tool must be repaired and
corrected before returning tool to use.
INSTALLATION
• To ensure long life and dependable service, use a Closed Loop Air System
and Filter-Regulator-Lubricator (FRL) as diagramed below.
• Each tool should have its own dedicated hose connected to an air supply
FRL. Quick disconnects should be installed at the FRL in an effort to reduce
contamination into the tool. Securely affix all fittings and hose assemblies.
• It is strongly recommended that all Dynabrade rotary vane air tools be used
with a Filter-Regulator-Lubricator to minimize the possibility of misuse due
to unclean air, wet air or insufficient lubrication. Dynabrade recommends
the following: 10690 Air Line Filter-Regulator-Lubricator — Provides
accurate air pressure regulation, two-stage filtration of water contaminants
and micro-mist lubrication of pneumatic components.
• Dynabrade recommends 1 drop of air lube per minute for each 20 SCFM
(example: if the tool specification states 40 SCFM, set the drip rate
on the filter-lubricator to 2 drops per minute). 95842 Dynabrade Air Lube
is recommended.
MAINTENANCE SCHEDULE
Maintenance schedules depend on the type and style of tool. Refer to page
3 to reference symbols associated with specific maintenance items/areas.
Match maintenance schedules accordingly. See page 4 for any additional
maintenance information.
Daily (every 8 hours):
• Inspect tool and accessories for damage or broken parts. Replace items
as necessary to ensure proper operation and safety.
Lubricate motor as recommended. Use 95842 Dynabrade Air Lube
(10W/NR). Apply 1 drop/minute of air lube per 20 SCFM.
• Check air line pressure with a gage. (MAX. 90 PSIG or 6.2 Bar operating
pressure at the air inlet of the tool.)
• Check tool for proper operation: If operating improperly or demonstrates
unusual vibration, the tool must be serviced and problem corrected before
further use.
Every 20 Hours/Once a Week (which ever comes first):
• Measure RPM (speed) by setting air pressure to 90 PSIG (6.2 Bar) at tool
inlet, without accessory mounted, while the tool is running. Using a
tachometer, check spindle speed of the tool. Unless otherwise stated the
no-load speed may not exceed the rated speed. If tool speed exceeds
maximum rated RPM, service as required and correct before use.
• If tool is running too fast: look for worn, damaged or missing governor and
silencer(s). Service as required.
• If tool is running too slow: look for malfunctioning governor, clogged inlet
screen, silencer(s) or air stream. Service as required.
• Governors are not serviceable including the trip disc which activates
the overspeed door. Replace complete 54984 Governor Assemblies,
do not try to repair. Governors should be handled with care. Do not pull on
springs or trip disc in effort to adjust governor.
Note: Special care must be taken when servicing governors. Refer to specific
tool manual for governor instructions and/or speed control devices. Governor
assemblies made from molded plastic components are non-serviceable and
must be replaced.
Every 1,000 Hours (every time tool is rebuilt):
Gears are greased for the life of the tool. Replace if grease is hard
packed or full of debris. Install 14 grams of 96747 Grease on pinion
gear and in cavities on either side of top spindle bearing. Keep
grease out of top spindle bearing pocket as it may prevent ability to
seat bearing in cavity.
REPAIR
• Use only genuine Dynabrade replacement parts to ensure quality. To order
replacement parts, specify Model#, Serial# and RPM of your air tool.
• Mineral spirits are recommended when cleaning the tool and parts. Do
not clean tool or parts with any solvents or oils containing acids, esters,
ketones, chlorinated hydrocarbons or nitro carbons.
• A Motor Tune-Up Kit is available which includes high wear and medium
wear motor parts.
• Air tool markings must be kept legible at all times, if not, reorder housing
and replace. User is responsible for maintaining specification information.
After maintenance is performed on tool, add a few drops of 95842
Dynabrade Air Lube to the tool inlet and start the tool a few times to
lubricate air motor. Verify RPM (per 20 hr maintenance schedule),
vibration and operation.
• The overspeed device has two main components:
- The trip disc which is integral to the governor assembly.
- The overspeed door.
• The overspeed door is held open via an interference fit between the door,
the hinge pin and the rear end plate. If a governor were to fail and allow the
tool to overspeed, the trip disc would expand and close the overspeed door
preventing air from entering the motor.To reset the overspeed door, loosen
and remove the four screws holding the throttle handle and remove the
spacer, motor spring, gasket and governor chamber, if necessary remove
motor. Flip the overspeed door open and gently snap it back into place.
There should be a slight resistance as the door approaches 90°. The door
should be tipped towards the governor by 5° and not wiggle or move freely.
Turn motor by hand to ensure all parts spin freely and have clearance.
Reassemble tool and set air pressure at 90PSIG (6.2 Bar) at tool inlet and
check RPM as indicated. If tool overspeeds again or there is no resistance
when the overspeed door is reset, replace governor assembly, the
overspeed door, the hinge pin and possibly the rear end plate.
HANDLING & STORAGE
• Use of tool rests, hangers and/or balancers is recommended.
• Protect tool inlet from debris (see Notice below).
•Do Not carry tool by air hose or near the tool throttle lever.
• Store accessories in protective racks or compartments to prevent damage.
• Follow the handling instructions outlined in the operating instructions when
carrying the tool and when changing accessories.
• Protect accessories from exposure to water, solvents, high humidity,
freezing temperature and extreme temperature changes.
END OF USE/ DISPOSAL
When tool has reached its end of useful service, disassemble tool into its
primary components (i.e. steel, aluminum and plastic) and recycle or discard
per local, state and/or federal regulations as to not harm the environment.
NOTICE
All Dynabrade air motors use the highest quality parts available and are
manufactured to exacting tolerances. Air motor failures are often traced to lack
of lubrication or unclean air supply. Compressed air can force dirt and other
contaminants into motor bearings causing early failure. Contaminants can score
cylinder wall and vanes resulting in reduced efficiency and power. Our warranty
obligation is contingent upon proper use of our tools. Air motors which have been
subjected to misuse, contaminated air or lack of lubrication will void warranty.
O
G
O

Models
53281 - 7" Dia., 8,500 RPM
53283 - 9" Dia., 6,500 RPM
Rebel Series Grinders
Complete Assembly
AR – “As Required”
2
5
7
8
9
10
22
23
24 26
27
29
3
ITEM P/N DESCRIPTION QTY.
154989 RETAINER SCREW 1
254982 OUTER FLANGE 1
354930 AUTO BALANCER 1
496274 SCREW 5
554918
54919
7" TYPE 27 GUARD - 53281
9" TYPE 27 GUARD - 53283 1
654952 LOCK RING 1
754950 SPINDLE 1
854917 BEARING 1
952132 SHIM 1
10 52133 SHIM 1
11 54912
54911
GEAR SET - 53281
GEAR SET - 53283 1
12 02649 BEARING 1
13 97995 WAVE DISC 1
14 98285 SPRING 1
15 96156 O-RING 1
16 54938 PLUNGER 1
17 53134 DAMPENING HANDLE 1
18 54928 SILENCER 1
19 54954 MUFFLER COVER 1
20 50511 SCREW 1
21
55095
55097
HOUSING - 53281
HOUSING - 53283
INCLUDES 54939 BUSHING
1
21.1 25286 WARNING LABEL 1
21.2 25285 MODEL LABEL 1
22 54900 BEARING 1
23 54910 SHIM PACK AR
24 54909 SHIM 1
25 01787 O-RING 1
26 54901 FRONT END PLATE 1
27 54902 SPACER 1
28 54904 VANE SET (4/PKG) 1
29 54903 ROTOR 1
30 54905 CYLINDER 1
31 96441 PIN 1
32 54906 REAR END PLATE 1
33 96779 O-RING 1
34 54908 OVERSPEED DOOR 1
35 96774 HINGE PIN 1
36 96775 SCREW 2
37 96772 WAVE WASHER 1
38 96773 O-RING 1
39 54907 BEARING 1
40 54984 GOVERNOR ASSY 1
41 54953 GOVERNOR CHAMBER 1
42 95526 O-RING 1
43 54958 GASKET 1
44 54960 MOTOR SPRING 1
45 54961 SPACER 1
46 54936 THROTTLE HANDLE 1
47 95720 SCREW 4
48 54940 BUSHING 1
49 97045 PLUNGER 1
50 96776 PIN 1
51 54937 THROTTLE LEVER 1
52 54941 SAFETY LATCH 1
53 54942 SPRING 1
54 95164 PIN 1
55 54945 PIN 1
56 54943 ACTIVATOR PIVOT 1
57 54944 BALL SEAT 1
58 97807 O-RING 1
59 54946 BALL 1
60 54947 SPRING 1
61 96512 RETAINER RING 1
62 54988 INLET SCREEN 1
63 96777 O-RING 1
64 54990 INLET BUSHING 1
—94949 PIN SPANNER WRENCH 1
12
13
21
1
17
14
20
51
50
53 54
55
19
18
41
30
32
31
33
35
34
37
38
39
43
56
57 59
60
61
62
44 45
46
52
T84
A8
A8
A10
T23
T35
6
G4
11
O1
16
O1
O1
42
T9
47
O1
58
O1
O1
25
28
T2
T248
49
64
A10
T2
40
A10
T17
G4
O1
O1
63
Adhesive: A2= Loctite #271
A8= Loctite #567
A10= Loctite #243
Grease: G4= 96747
Oil: O1= Air Lube
O
A
G
Tx
KEY
Always follow adhesive manufacturers
cleaning and priming recommendations.
X = Torque Value (N•m)
(N•m x 8.85 = lb•in.)
15
21.1
21.2
11
36
3

DYNABRADE, INC. www.dynabrade.com
8989 Sheridan Drive • Clarence, NY 14031-1419 • Phone: [phone] • Fax: [phone] • International Fax: [phone]
© DYNABRADE, INC., 2017
OPTIONAL ACCESSORIES
MACHINE SPECIFICATIONS
LIFETIME WARRANTY
To validate Dynabrade Lifetime Warranty, you must register each tool at: www.dynabrade.com. Registration of each tool at website is required.
Dynabrade will not honor Lifetime Warranty on unregistered tools. Please view the entire Lifetime Warranty Policy at www.dynabrade.com.
Additional Specifications: Air Inlet Thread 1/2" NPT • Hose I.D. 1/2" (10 mm) • Spindle Thread 5/8"-11
Visit dynabrade.com for your model’s current vibration and sound data.
Model Speed Power Air Consumption Diameter Weight Length Height
53281 8,500 RPM 2.8 hp (2,088 W) 115 SCFM (4,406 LPM) 7" (180 mm) 7.5 lb. (3.4 kg) 13.4" (340 mm) 4.2" (107 mm)
53283 6,500 RPM 2.8 hp (2,088 W) 115 SCFM (4,406 LPM) 9" (230 mm) 7.9 lb. (3.6 kg) 13.4" (340 mm) 4.2" (107 mm)
Dynabrade Air Lube
• Formulated for pneumatic equipment.
• Absorbs up to 10% of its weight in water.
• Prevents rust and formation of sludge.
• Keeps pneumatic tools operating longer
with greater power and less down time.
Part No. 95842: 1pt. (473 ml)
Part No. 95843: 1 gal. (3.8 L)
Grease
• For use when current grease is hard
packed or full of debris.
• Apply every 1,000 hours of tool use or
everytime tool is rebuilt.
Part No. 96747: 14 grams
Whip Hose
• 1/2" diameter air line with 1/2" NPT female fitting,
and 1/2" NPT male Mega Flow Plug.
Part No. 94825: 5 feet
Tune-Up Kit
• Contains high and medium wear parts.
Part No. 96644
High Profile Guard
•
Used for type 27 flap discs and any other
abrasive that doesn’t properly fit under
the lip of the standard guard.
Part No. 54920: 7" (180 mm) diameter
Part No. 54921: 9" (230 mm) diameter
G4
REFERENCE CONTACT INFORMATION
American National Standards Institute (ANSI)
25 West 43 Rd St. 4th Floor | New York, NY 10036
Tel: [phone] | www.ansi.org
Compressed Air & Gas Institute (CAGI)
1300 Sumner Ave | Cleveland, OH 44115
Tel: [phone] | www.cagi.org
European Committee for Standardization (PNEUROP)
rue des Drapiers 21 | 1050 Brussels, Belgium | www.pneurop.org
International Organization of Standards (ISO)
P.O box 56 | Ch-1211 Geneve 20, Switzerland | www.iso.org
U.S. Government Publishing Office (GPO)
Superintendent of Documents
732 North Capitol Street NW | Washington, DC 20401
Tel: [phone] | www.gpo.gov