Dynabrade 52903 Guide

SAFETY INSTRUCTIONS
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.
Tool Intent: Pistol Grip Drills are used for drilling holes in wood, plastics, fiberglass, laminates, hard and soft materials, ceramics, aluminum and steel. An appropriate external
vacuum source is required that is suitable for material being processed.
Do Not use tool for anything other than intended applications.
Training: Proper care, maintenance, and storage of your tool will maximize performance.
• Employer's Responsibility – Provide Pistol Grip Drill operators with safety instructions and training for safe use of tools and accessories.
Warning: Remove chuck key before turning on the tool. Side handle must be used for maximum control over torque reaction or kick-back on 500 & 1,000 RPM models.
(continued on next page)
Parts Page Reorder No. PD09•61
Effective December, 2009
Air Tool Manual – Safety, Operation and Maintenance
Models: 1/4" Drill Chuck
52903 – 500 RPM
52904 – 1,000 RPM
52905 – 2,400 RPM
52906 – 3,600 RPM
52907 – 5,500 RPM
SAFETY LEGEND
WARNING
WARNING
Read and understand tool manual before
work starts to reduce risk of injury to
operator, visitors, and tool.
WARNING
Eye protection must be worn at all times,
eye protection to conform to ANSI Z87.1.
WARNING
Respiratory protection to be used when exposed to
contaminant's that exceed the applicable threshold
limit values required by law.
WARNING
Some dust created by 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.
WARNING
Practice safety requirements. Work alert,
have proper attire, and do not operate tools under
the influence of alcohol or drugs.
WARNING
Ear protection to be worn when exposure to sound,
exceeds the limits of applicable Federal, State or
local statues, ordinances and/or regulations.
WARNING
Air line hazard, pressurized supply lines and flexible
hoses can cause serious injury. Do not use damaged,
frayed or deteriorated air hoses and fittings.
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 Safety Institute
(ANSI) Safety Code for Portable Air Tools – B186.1. For additional safety information, refer to Safety Requirements for the Use, Care
and Protection of Abrasive Wheels – ANSI B7.1, Code of Federal Regulation – CFR 29 Part 1910, European Committee for Standards
(EN) Hand Held Non-Electric Power Tools – Safety Requirements and applicable State and Local Regulations.
SAVE THIS DOCUMENT, EDUCATE ALL PERSONNEL
FIND THE MOST CURRENT OFFERING OF SUPPORT DOCUMENTS AND ACCESSORIES @ WWW.DYNABRADE.COM
.4 hp Vacuum Drill
Pistol Grip / Central Vacuum / Rear Exhaust
Model 52906 Shown
1-1/4" Threaded
Vacuum Port

2
Filter
Regulator
Lubricator
90 PSIG
(6.2 Bar)
To Tool Station
Closed Loop Pipe System
(Sloped in the direction of air flow)
Ball
Valve
Ball
Valve
Filter
Regulator
Lubricator
Air Flow
Drain
Valve
Drain
Valve
Air Tool
Air Compressor
and Receiver
Drain Valve
Air Hose
90 PSIG MAX
(6.2 Bar)
Air Flow
Refrigerated
Air Dryer
1DROP/MIN.
20 SCFM
LUBRICATOR SETTING
• Dynabrade Air Power Tools are designed to operate at 90
PSIG (6.2 Bar/620 kPa) maximum air pressure at the tool
inlet, when the tool is running. Use recommended regulator
to control air pressure.
• Ideally the air supply should be free from moisture. To
facilitate removing moisture from air supply, the installation
of a refrigerated air dryer after the compressor and the
use of drain valves at each tool station is recommended.
➤➤
➤
➤
➤
➤
Caution: If the bit binds, the drill will suddenly react in the opposite direction of the rotation of the bit. The operator should prepare for a sudden reaction by holding the tool securely.
• Use proper speed for the size of bit. larger bits should be run at the lower speed. Driving larger bits at the high speeds will increase the chance of reaction.
• Avoid drilling warped, wet, knotty, and pitchy materials if possible.
• When removing the bit from the tool avoid contact with the skin and use proper protective glove when grasping the bit or accessory. Accessories may be hot after prolonged use.
• Make sure that work area is uncluttered, and visitors are at a safe range from the tools and debris.
• A moving drill accessory that snags or catches within work piece may cause tool to stop unexpectedly or move erratically, which may cause injury.
Warning: Air tools are not intended for use in explosive atmospheres and are not insulated for contact with electric power sources.
• Use a vise or clamping device to hold work piece firmly in place. Do not apply excessive force on tool or apply “rough” treatment to it.
Warning: Always work with a firm footing, posture and proper lighting.
• Ensure that sparks and debris resulting from work do not create a hazard.
• This tool is rear exhaust. Exhaust may contain lubricants, vane material, bearing grease, and other materials flushed through the tool.
Warning: Drilling certain materials can create explosive dust. It is the employer's responsibility to notify the user of acceptable dust levels.
• Some material contains chemicals which may be toxic. Take caution to prevent dust inhalation and skin contact. Follow material supplier safety data.
• Certain materials can cause sparks which can cause fires or explosions. It is the user's responsibility to make sure the work is done on spark free materials.
Report to your supervisor any condition of the tool, accessories, or operation you consider unsafe.
SAFETY INSTRUCTIONS CONTINUED
Accessory Selection:
• Abrasive/accessory RPM (speed) rating MUST be approved for AT LEAST the tool RPM rating.
• Before mounting an accessory, visually inspect for defects. Do not use defective accessories.
• Use only recommended accessories. See back page of manual and Dynabrade catalog.
• Follow tool specifications before choosing size and type of accessory.
• Only use recommended fittings and air line sizes. Air supply hoses and air hose assemblies must have a minimum working pressure rating of 150 PSIG (10 Bars, g) or 150
percent of the maximum pressure produced in the system, whichever is higher. (See tool Machine Specifications table.)
OPERATING INSTRUCTIONS
Warning: Always wear eye protection. Operator of tool is responsible for following: accepted eye, face, respiratory, hearing and body protection.
Caution: Hand, wrist and arm injury may result from repetitive work, motion and overexposure to vibration.
• Tool RPM must never exceed abrasive/accessory RPM rating. Check accessory manufacturer for details on maximum operating speed or special mounting instructions.
Warning: Keep hand and clothing away from working end of the air tool.
Warning: Unexpected tool movement or breakage of inserted tool may cause injury.
Caution: Release throttle in case of an interruption of the energy supply.
Caution: Use only recommended lubricants.
Warning: Be sure that any loose clothing, hair and all jewelry is properly restrained.
• Secure inlet bushing on air tool with a wrench before attempting to install the air fitting to avoid damaging housing assembly.
• BEFORE MOUNTING AN ACCESSORY, after all tool repairs and whenever a drill is issued for use, check tool RPM (speed) with tachometer with air pressure set at 90
PSIG while the tool is running. If tool is operating at a higher speed than the RPM marked on the tool housing, or operating improperly, the tool must be serviced and
corrected before use.
DRILL ACCESSORY MOUNTING INSTRUCTIONS
Warning: Disconnect power source before removing inserted tool.
• Loosen locking knob and remove vacuum shroud/base.
• Open chuck jaws wide enough to install bit. Be sure the bit shank and chuck jaws are clean. Dirt particles may prevent the bit from lining up properly.
• Insert the bit into the chuck. Center the bit in the chuck jaws and lift it about 1/16" off the bottom. Tighten the chuck jaws by the hand to align the bit.
• Place the chuck key in each of the three holes in the chuck, turning it clockwise. Tighten securely.
Caution: Remove adjusting keys or wrenches before turning the tool on. A wrench or a key is left attached to a rotating part of the tool may result in personal injury.
• Reinstall vacuum shroud/base and tighten locking knob.
• Optimal vacuum is accomplished when the tip of the drill bit is flush with the end of the shroud. When the bit extends beyond shroud some vacuum capture is lost. When the
bit is too short alignment may be difficult. The shroud position may be adjusted by loosening the clamp and sliding the shroud along the base and then retightening clamp.
• Connect air tool to power source. Be careful NOT to depress throttle in the process. Do not expose air tool to inlet pressure above 90 PSIG or (6.2 Bars).
Caution: After installing the accessory, before testing or use and/or after assembling tool, the Pistol Grip Drill must be started at a reduced speed to check for good balance.
Gradually increase tool speed. DO NOT USE if tool vibration is excessive. Correct cause, and retest to insure safe operation.
• To remove the bit, insert the chuck key into the holes in the chuck and turn counterclockwise.
Bit Selection:
• Vacuum is most effective using drill bits ranging from 4-6 inches.
• Use sharp bits. Sharp bits are less likely to bind when drilling. Use the proper bit for the job.
• Check the information on the bit's packaging for proper usage. Do not use bits larger than the rated capacity of the drill.
Air System

This service chart is published as a guide to expectant life of component parts. The replacement levels are based on average tool
usage over one year. Dynabrade Inc. considers one year usage to be 1,000 hours.
Preventative Maintenance Schedule
Pistol Grip Drill – All Models
Index Part Description Number High Wear Medium Wear Low Wear Non-Wear
# Number Required 100% 70% 30% 10%
153030 1/4" Drill Chuck 1 X
252954 Nut 1 X
397445 Retaining Nut 1 X
401139 Bearing 1 X
513059 Collar 1 X
695042 Washer 1 X
753113 Handle 1 X
8See pg 4 Nose Cover 1 X
997922 Wave Spring 1 X
10 02698 Bearing 1 X
11 See pg 4 Carrier See pg 4 X
12 See pg 4 Gear See pg 4 X
13 See pg 4 Pin See pg 4 X
14 97443 Retaining Ring 1 X
15 52966 Washer 1 X
16 See pg 4 Carrier Adapter 1 X
17 54468 Ring Gear 1 X
18 50778 Spacer 1 X
19 52949 Ring Gear 1 X
20 52967 Spacer 1 X
21 02649 Bearing 1 T
22 54529 Shim Pack (3/Pkg.) 1 T
23 02038 Front Bearing Plate 1 X
24 01479 Spacer 1 T
25 See pg 4 Rotor 1 X
26 01480 Vane (4/Pkg.) 1 T
27 01476 Cylinder 1 X
28 50767 Pin 1 T
29 02673 Rear Bearing Plate 1 X
30 02696 Bearing 1 T
31 97807 O-Ring 1 T
32 01041 Grease Fitting 1 X
33 See pg 4 Housing 1 X
34 50936 Pin 1 X
35 52942 Grip 1 X
36 01696 Felt Ring See pg 4 T
37 52958 Aspirator 1 X
38 52960 Sleeve Adapter 1 X
39 01464 Seal 1 T
40 01472 Tip Valve 1 T
41 52943 Spring 1 T
42 97444 Retaining Ring 1 X
43 52959 Inlet Adapter 1 X
44 50784 Set Screw 1 X
45 52955 Trigger Assembly 1 X
46 96077 O-Ring 1 X
47 52984 Baffle 1 X
48 52753 Flexible Vac. Drill Shroud 1 X
49 97029 Clamp 1 X
50 02276 Shroud Base 1 X
51 53219 Locking Knob 1 X
52 40029 Cam Lock 1 X
53 96071 Set Screw 2 X
54 See pg 4 Sleeve 1 X
55 31900 Hose Cuff 1 X
56 31926 Vacuum Hose 1 X
57 97206 Hex Nut 1 X
58 95758 Washer 2 X
59 52751 Inlet Adapter 1 X
60 31905 1-1/4" Swivel Cuff 1 X
61 50584 Hose Holder 1 X
7
Tune-Up Kit
Part No. 96067
LEGEND
TIncluded in Tune-Up Kit
XType of wear, no other
comments apply.
LEasily lost. Care during
assembly/disassembly.
DEasily damaged during
assembly/disassembly.
RReplace each time tool is
disassembled.

Disassembly/Assembly Instructions – Vacuum Pistol Grip Drills (Cont.)
9. A snug fit will trap the cylinder while still allowing it to be shifted from side to side with a slight amount of finger pressure. A loose fit will
not achieve proper preload of the motor bearings.
Motor Assembly Complete:
Tool Assembly:
For All Models:
1. Secure the wrench flats of the 52960 Sleeve Adapter in a vise with aluminum or bronze jaws. Install the 01464 Seal, 01472 Tip Valve and the small
end of 52943 Spring against the tip valve. Apply a small amount of Loctite #271 (or equivalent) to the external threads of the 52959 Inlet Adapter, and
install it to the 52960 Sleeve Adapter. (Torque to 17 N•m/150 in. lbs.)
2. Use the exploded view of the muffler components for the correct order of assembly and install these onto the inlet bushing sub assembly from step 1.
Note: For drill models 52903/04/05/06/07 - slide 52958 Aspirator as shown and install 97444 Retaining Ring in grove closest to thick hex head. Slide
(4) 01696 Felt Rings, align felt rings so that all the tabs are inline and orientated with the cutout in the handle grip. For models 52905 slide 52958
Aspirator as shown and install (2) 01696 Felt Rings. Slide 52984 Baffle as shown up and inside felt rings. Install 97444 Retaining Ring in groove below
the 52984 Baffle. Install 96077 O-Ring into the handle at the base of the oval shape counter bore.
3. Secure the housing in a vise with aluminum or bronze jaws. Pull trigger apply a small amount of the Loctite #567 (or equivalent) to the external threads of
the 52960 Sleeve Adapter and install it onto the housing. (Torque to 17 N•m/150 in. lbs.)
4. After threaded surfaces have been properly cleaned and primed, apply a small amount of Loctite #567 (or equivalent) to 52751 Inlet Adapter before
assembling to 52959 Inlet Bushing Assembly. Hold the 52959 Inlet Bushing Assembly stationary with an adjustable wrench when installing the
air connection fitting.
5. With the housing secured in the vise, install the 52955 Trigger Assembly. Be sure to locate the notched area of the valve stem so that the 50936 Pin
will retain the trigger assembly. Note: Left side of housing has a slip fit to pin and right side will retain pin.
7. Install the motor assembly into the housing. Insure 97807 O-Ring is properly secured before installing motor.
8. Install the correct spacer for the specific model tool.
9. Use the 96239 Bearing Press Tool and arbor press to install the 02698 Bearing onto the spindle/carrier. (Place the press tool against the inside
race of the bearing.)
For Models: 52903/04/05/06/07
10. Install planet gears and pins into the carrier(s). Use external retaining ring pliers to install the 97443 Retaining Ring.
11. Install ring gear into the housing so that the notches in the ring gear align with openings for the set screw and lubricant fitting.
Important: For Models 52903 and 52904 install the 52966 Washer (2) between the planetary carrier and motor, assemblies.
12. Apply a small amount of Loctite #567 (or equivalent) to the threads of the 50784 Set Screw and install flush with outer housing surface,
Do Not over tighten.
13. Lubricate the planetary gears through the lubricant fitting. Initially apply 3 plunges of lubricant. (Apply 1 plunge at intervals of every 50 hours of use
there after.) Order and use the recommended Dynabrade 95542 Grease and the 95541 Lubricant Gun to ensure maximum gear life.
For All Models:
14. Use the 96240 Bearing Press Tool to install the 01139 Bearing into the nose cover. (Place the press tool against the outside race of the bearing.)
15. Use internal retaining ring pliers to install the 97445 Retaining Ring into the nose cover.
16. Install the spindle/carrier adapter assembly into the nose cover.
17. Use the 16 mm crowfoot and torque wrench and a 3/16” hex key to install the 52954 Spindle Nut turning it clockwise.
(Torque to 17 N•m/150 in. lbs.)
18. Carefully secure the housing in a vise so that the motor opening is facing up. To avoid damaging the housing do not over tighten the vise.
19. Apply a small amount of Loctite #567 to the housing threads and carefully align the nose cover, spindle or planetary gear assembly(ies) with the
housing and the air motor assembly turning it clockwise. Use a 26 mm crowfoot and torque wrench. (Torque to 17 N•m/150 in. lbs.)
20. Use the 96453 Open-end Wrench (16 mm) and a hex key wrench secured in the jaws. (Hand Tight)
Tool Assembly Complete:
Special Repair Tooling Referenced: Use to remove bearings, gears, and other components.
96210 Bearing Removal Tool 96239 Bearing Press Tool 96240 Bearing Press Tool
96241 Bearing Press Tool 96242 Bearing Press Tool 96346 (2") Bearing Separator
96232 Arbor Press
Gear Lubricant Maintenance Instructions:
Lubricate the planetary gears through the grease fitting. Apply 1 plunge at intervals of every 50 hours of use. Order and use the recommended Dynabrade
95542 Grease and the 95541 Lubricant Gun to ensure maximum gear life.
6

Maintenance Instructions
Important: To keep tool safe a preventative maintenance program is recommended whenever portable power tools are used. The program should include
inspection of air supply lines, air line pressure, proper lubrication and repair of tools. Refer to ANSI B186.1 for additional
maintenance information.
• Use only genuine Dynabrade replacement parts to insure quality. To order replacement parts, specify Model#, Serial# and RPM of your air tool.
• 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: 10681 Air Filter-Regulator-Lubricator (FRL) – Provides accurate air
pressure regulation and two stage filtration of water contaminant's.
• Grease the planetary gear assembly with the 95542 Grease by applying 2-3 plunges with the 95541 Grease Gun after every 50 hours of use for
maximum gear life.
• Dynabrade recommends one 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). Dynabrade Air Lube (P/N 95842: 1 pt 473 ml) is recommended.
Routine Preventative Maintenance:
• Check free speed of Pistol Grip Drill using a tachometer after every service or repair.
Caution: 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.
Caution: DO NOT clean or maintain tools with chemicals that have a low flash point (example: WD-40®).
• A Motor Tune-Up Kit (P/N 96067) is available which includes high wear and medium wear motor parts.
• Air tool laser etch information must be kept legible at all times, if not, reorder housing and replace. User is responsible for maintaining specification
information i.e.: Model #, S/N, and RPM. (See Assembly Breakdown)
• Blow air supply hose out prior to initial use.
• Visually inspect air hoses and fittings for frays, visible damage and signs of deterioration. Replace damaged or worn components.
• Refer to Dynabrade's Warning/Safety Operating Instructions Tag (Reorder No. 95903) for safety information.
After maintenance is performed on tool, add a few drops of Dynabrade Air Lube (P/N 95842) to the air line and start the tool a few times to lubricate air motor.
Check for excessive tool vibration.
Handling and Storage:
• Use of tool rests, hangers and/or balancers is recommended.
• Protect tool inlet from debris.
• DO NOT carry tool by air hose, or near the trigger.
• Store accessories in protective racks or compartments to prevent damage.
Machine Specifications
3
Model Motor Motor Chuck Sound Air Flow Rate Air Pressure Spindle Thread Weight Length Height
Number hp (W) RPM Size Level SCFM (LPM) PSIG (Bars) Size Pound (kg) Inch (mm) Inch (mm)
52903 .4 (310) 500 1/4" 76 dB(A) 23 (651) 90 (6.2) 3/8"-24 3.7 (1.7) 10.6 (268) 11.8 (300)
52904 .4 (310) 1,000 1/4" 80 dB(A) 25 (708) 90 (6.2) 3/8"-24 3.7 (1.7) 10.6 (268) 11.8 (300)
52905 .4 (310) 2,400 1/4" 77 dB(A) 22 (623) 90 (6.2) 3/8"-24 3.1 (1.4) 10.6 (268) 11.8 (300)
52906 .4 (310) 3,600 1/4" 80 dB(A) 23 (651) 90 (6.2) 3/8"-24 3.1 (1.4) 10.6 (268) 11.8 (300)
52907 .4 (310) 5,500 1/4" 81 dB(A) 25 (708) 90 (6.2) 3/8"-24 3.1 (1.4) 10.6 (268) 11.8 (300)
Additional Specifications: Air Inlet Thread 1/4" NPT • Hose I.D. 3/8" or 10 mm
Sound Level is the pressure measurement according to the method outlined in ISO regulation ISO-15744.
Notice
All Dynabrade motors use the highest quality parts and materials 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.
Lifetime Warranty
All Dynabrade portable pneumatic power tools are rigorously inspected and performance tested in our factory before shipping to our customers. If
a Dynabrade tool develops a performance problem and an inherent defect is found during normal use and service, Dynabrade will warrant this tool
against defects in workmanship and materials for the lifetime of the tool. Upon examination and review at our factory, Dynabrade shall confirm that
the tool qualifies for warranty status, and will repair or replace the tool at no charge to the customer. Normally wearable parts and products are NOT
covered under this warranty. Uncovered items include bearings, contact wheels, rotor blades, regulators, valve stems, levers, shrouds, guards, O-
rings, seals, gaskets and other wearable parts. Dynabrade’s warranty policy is contingent upon proper use of our tools in accordance with factory
recommendations, instructions and safety practices. It shall not apply to equipment that has been subjected to misuse, negligence, accident or
tampering in any way so as to affect its normal performance. To activate lifetime warranty, customer must register each tool at www.dynabrade.com.
Dynabrade will not honor lifetime warranty on unregistered tools. A one-year warranty will be honored on all unregistered portable pneumatic power
tools. Lifetime warranty applies only to portable pneumatic tools manufactured by Dynabrade, Inc. in the USA. Lifetime warranty applies only to the
original tool owner; warranty is non-transferable.

153030 1/4" Drill Chuck (Includes Key)
252954 Spindle Nut
397445 Retaining Ring
401139 Bearing
513059 Collar
695042 Washer
753163 Handle Assy.
852952 Nose Cover - 52905/06/07
52953 Nose Cover - 52903/04
997922 Wave Spring
10 02698 Bearing
11 52950 Carrier - 52905/06
52951 Carrier - 52903/04/07
12 54519 Gear (3) - 52903/05/06
06213 Gear (3) - 52903/07
Gear (6) - 52904
(Includes 01033 Bearing)
13 54472 Pin (3) - 52905/06/07
Pin (6) - 52903/04
14 97443 Retaining Ring
15 52966 Washer
16 52962 Carrier Adapter - 52903
52963 Carrier Adapter - 52904
17 54468 Ring Gear - 52905/06/07
18 50778 Spacer - 52905/06/07
19 52949 Ring Gear - 52903/04
20 52967 Spacer - 52903/04
21 02649 Bearing
22 54551 Shim Pack (3/Pkg.)
23 02038 Front Bearing Plate
24 01479 Spacer
25 52947 Rotor - 52903/05/06
52948 Rotor - 52904/07
26 01480 Vane (4)
27 01476 Cylinder
28 50767 Pin
29 02673 Rear Bearing Plate
30 02696 Bearing
31 97807 O-Ring
32 01041 Grease Fitting
33 Housing Assembly
52912 Model - 52903
52913 Model - 52904
52926 Model - 52905
52927 Model - 52906
52928 Model - 52907
34 50936 Pin
35 52942 Grip
36 01696 Felt Ring (4) - 52903/04/06/07
Felt Ring (2) - 52905
37 52958 Aspirator
38 52960 Sleeve Adapter
39 01464 Seal
40 01472 Tip Valve
41 52943 Spring
42 97444 Retaining Ring
43 52959 Inlet Adapter
(Incld: 56022 Screen)
44 50784 Set Screw
45 52955 Trigger Assembly (Incld:
55035, 50936 and 52952)
46 96077 O-Ring - 52905
47 52984 Baffle - 52905
48 52753 Flexible Vacuum Drill Shroud
49 97029 Clamp
50 02276 Shroud Base
51 53219 Locking Knob
52 40029 Cam Lock
53 96071 Set Screw (2)
54 52982 Sleeve - 52905/06/07
52983 Sleeve - 52903/04
55 31900 Hose Cuff
56 31926 Vacuum Hose
57 97206 Hex Nut
58 95758 Washer (2)
59 52751 Inlet Adapter
60 31905 1-1/4" Threaded Swivel Cuff
61 50584 Hose Holder
A8
Index Key
No. Part # Description
Vacuum Pistol Grip Drill
Complete Assembly
A
G
Adhesive: A2= Loctite #271
A6= Loctite #380
A8= Loctite #567
KEY
Grease: G1= Lubriplate 630 AA
TTorque: N•m x 8.85 = In. - lbs.
OOil: O1= AirLube
1
34
910 60
61
56
55
53
54 57
58
59
53
52
51
50
49
48
Models 52905/06/07 Only Models 52903/04 Only
Models 52905/06/07 Only
Models 52903/04 Only - 13141 Handle Assembly
Models 52903/04 Only
11
12
12
13
13
14 16 15
17
19
21
22 23
24
25
26
27
30
28
31
33
32
34
35
36
36
47
46
37
37
39
40
41
42
45
29
20
18
8
17 N•m
T
17 N•m
T
A8
17 N•m
T
17 N•m
T
17 N•m T2
5
6
7
A
2
A8
38
43
Housing
Includes
52942 Grip &
01041 Grease
Fitting
53050 1/4" Chuck Key
96453 16 mm Wrench
Models 52905 Only
Models 52903/04/06/07 Only
A8
O1
G1A6
44
Always follow adhesive manufacturers
cleaning and priming recommendations.
A8

5
(continued on next page)
Disassembly/Assembly Instructions – Vacuum Pistol Grip Drills
Important: The Dynabrade Pneumatic Power Tool Lifetime Warranty Policy does NOT cover normally wearable parts and products.
Before servicing this tool please contact Dynabrade Inc. or a Dynabrade Subsidiary for information regarding the Dynabrade Pneumatic Power
Tool Lifetime Warranty Policy.
Notice: Special repair tooling referred to in these instructions can be ordered from Dynabrade. (See Page 6)
Disconnect tool from the air supply before servicing.
Tool Disassembly:
For All Models:
1. Use the 96453 Open-end Wrench (16 mm) and a hex key wrench secured into the jaws of the drill chuck. Remove the drill chuck turning it
counterclockwise.
2. Carefully secure the tool in a vise with aluminum or bronze jaws so that the spindle is pointing up. To avoid damaging the housing, do not over
tighten the vise.
3. Use an adjustable wrench to remove the 52852/52853 Nose Cover by turning it counterclockwise.
4. Use the 96453 Open-end Wrench (16 mm) and a 3/16" hex key to remove the 52954 Spindle Nut turning it counterclockwise.
5. Push the spindle out of the 01139 Bearing.
6. Use the 96232 Arbor Press and 96346 Bearing Separator (2") to remove the 02698 Bearing from the spindle.
7. Remove the 97922 Wave Spring from the nose cover.
8. Use internal retaining ring pliers to remove the 97445 Retaining Ring.
9. To remove the 01139 Bearing from the nose cover use the arbor press and the 96241 Bearing Press Tool. (Place the press tool against the inside
race of the bearing.)
For Models: 52903/04/05/06/07
10. Use external retaining ring pliers to remove the 97443 Retaining Ring.
11. Use a 1/8" diameter drive punch to remove the 54472 Pin (3) and 06213 Gear (3) from the carrier spindle. Note: Follow similar disassembly procedure
for models with double planetary gear reduction.
12. Use a 2 mm hex key to remove the 50784 Set Screw from the housing.
For All Models:
13. Use needle nose pliers to remove the spacer or ring gear.
14. Tap rim of housing against a wood block to remove the air motor.
15. Carefully secure the housing in a vise with aluminum or bronze jaws so that the air inlet is pointing up. To avoid damaging the housing,
do not over tighten the vise.
16. Use a 19 mm socket and wrench to remove the inlet bushing turning it counterclockwise. Remove muffler parts.
17. Use a 3/32" diameter drive punch to remove the 50936 Pin and 52955 Trigger Assembly. Remove pin from right side of housing to left side.
18. Secure the hex portion of the air inlet bushing in a vise with aluminum or bronze jaws and use an adjustable wrench to access the valve
assembly parts turning counterclockwise.
Tool Disassembly Complete:
Motor Disassembly:
1. Secure the 96346 Bearing Separator (2") around the end of the cylinder nearest the rear bearing plate. Place the separator on the table
of the 96232 Arbor Press so that the front of the motor is pointing down.
2. Use a 5/32" diameter flat end drive punch as a press tool and push the rotor out of the 02696 Bearing.
3. Remove vanes from the rotor.
4. Use the arbor press and separator to remove the front bearing, plate and spacer from the rotor.
5. Remove the 02696 Bearing from the rear bearing plate with the 96210 Bearing Removal Tool and the arbor press.
Motor Disassembly Complete:
Important: Clean and inspect all parts before assembling.
Motor Assembly:
1. Install 01479 Spacer onto the rotor.
2. Install .003" thickness of shims into 02038 Front Bearing Plate. Install 02649 Bearing into the front bearing plate.
3. Use the 96240 Bearing Press Tool and arbor press to install the front bearing plate along with 02649 Bearing onto the rotor. (Place the press tool
against the inside race of the bearing.)
4. Use a .001" feeler gauge to check clearance between the front of the rotor and the front bearing plate. That clearance must be .001"- .0015". If it is
necessary to adjust the clearance, do this by adding or removing the appropriate shim thickness.
5. Apply Dynabrade Air Lube 95842 to the 01480 Vanes (4) and install these into the rotor slots.
6. Install the 01476 Cylinder so that the air inlet passage lines up with the air inlet holes in the rear bearing plate.
7. Use the 96242 Bearing Press Tool and arbor press to install the 02696 Bearing into the 02673 Rear Bearing Plate. (Place press tool against the
outside race of the bearing.)
8. Use the 96242 Bearing Press Tool and arbor press to install the bearing/rear plate onto the rotor. (Place press tool against the inside race of the
bearing.) Important: Carefully press the bearing/rear plate assembly onto the rotor to achieve a snug fit between the bearing plates and the cylinder.

DYNABRADE
®
DYNABRADE, INC., 8989 Sheridan Drive • Clarence, NY 14031-1419 • Phone: [phone] • Fax: [phone] • International Fax: [phone]
DYNABRADE EUROPE S.àr.l., Zone Artisanale • L-5485 Wormeldange—Haut, Luxembourg • Telephone: [phone] • Fax: [phone]
© DYNABRADE, INC., 2009 PRINTED IN USA PD09.61_rev.1_12/09
Visit Our Web Site: www.dynabrade.com Email: Customer[email protected]
Optional Accessories
Dynaswivel
®
• Swivels 360° AT TWO PIVOT POINTS allowing the air hose to
drop directly to the floor while providing superb tool handling.
Part No. 94300 – 1/4" NPT
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.
Part No. 96210
Bearing Press Tool
• Use with (#2) arbor press to achieve accurate
press of bearings and motor parts.
Part No. 96240
Part No. 96244
Part No. 96216
Part No. 96239
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. 95821: 4oz. (118 ml)
Part No. 95842: 1pt. (473 ml)
Part No. 95843: 1gal. (3.8 L)
Reference Contact Information
1. American National Standards Institute – ANSI 3. European Committee for Standardization
25 West 43rd Street Rue de Stassart 36
Forth Floor B - 1050 Brussels, Belgium
New York, NY 10036
Tel: [phone]
Fax: [phone]
2. Government Printing Office – GPO 4. Power Tool Institute, Inc.
Superintendent of Documents P.O. Box 818
Attn. New Orders Yachata, Oregon 97498-0818
P.O. Box 371954 Tel: [phone]
Pittsburgh, PA 15250-7954 Fax: [phone]
Tel: [phone]
Motor Tune-Up Kit
• Includes assorted parts to help maintain and repair motor.
Part No. 96067
2" Bearing Separator
• Used to remove bearings, gears, and other components.
Part No. 96346
Grease
• Multi-purpose grease for all types of
bearings, cams, gears.
• High film strength; excellent resistance
to water, steam, etc.
• Workable range 0˚ F to 300˚ F.
Part No. 95542: 10oz. Grease Tube
Part No. 95541: Push-Type Gear Oil Gun
• One-hand operation.
FIND THE MOST CURRENT OFFERING OF SUPPORT DOCUMENTS AND ACCESSORIES @ WWW.DYNABRADE.COM
Hex Key
• This is used for the removal and installation of
the 52954 Spindle Nut
Part No. 95049 – 3/16"
Open End Wrench
• This is used for removal and installation
of drill chuck.
Part No. 96453 – 16 mm
Portable Vacuum Systems
• Dynabrade offers a wide assortment of
vacuuming options to choose from. To help
make your selection please request the most
current portable vacuum systems literature
form your local representative or by searching
our web site.