Dynabrade 50371 Important Operating, Maintenance And Safety Instructions

Brand: Dynabrade

Model: 50371

Type: Important Operating, Maintenance And Safety Instructions

Models:

50371 — With 3/8"-24 Male Spindle

50372 — With 5/8"-11 Male Spindle

4" Right Angle

Disc Sander

Parts Page Reorder No. PD96•61

Effective October, 1996

Supersedes PD96•17

50362 Angle Housing

50381 Lock Nut

50383 Collar

52186 Pinion/Gear Set

50332 Pinion Spacer

50368 Front Bearing Plate

01010 Spacer 01185 Blades(4/pkg.)

50379 Rotor 01028 Cylinder

01722 Rear Bearing Plate

02649 Bearing

50424 Bearing Washer

12152 Bearing

Spindle

52120 Shim Pack

(3/pkg.)

50431 Bearing

52088 Spacer

50412 Felt Ring

50289 Washer

53163 Handle

95042 Washer

01295 Housing

01477 Valve Stem

95730 O-Ring

01024 O-Ring

01247 Regulator

57344 Lever

95558 Retaining Ring

01017 Pin

01464 Seal

01472 Tip Valve

01468 Spring

50335 Silencer

50367 Felt Silencer 50336 Seal

50366 Exhaust Cover

50511 Screw (2)

01791 Washer (2)

07149 Clamp

Left Hand Threads

52186 Pinion/Gear Set

Right Hand Threads

50767 Guide Pin (2)

*Grease every 16 hours of use

See inside for Important Operating, Maintenance and Safety Instructions

01041 Grease Fitting*

Oil

Loctite/Hernon:

= Hernon #940

Torque: N•m x 8.85 = In. - lbs.

= 4.5 N•m, T

= 17 N•m, T

= 23 N•m

= 34 N•m, T

= 45 N•m

KEY

95375 O-Ring 96065 O-Ring

01494 Inlet Adapter

53190 Block Plate

50384 Spindle Bearing Cover

50334 - 3/8"-24

52117 - 5/8"- 11

Spindle Nut

50333 - 50371

52118 - 50372

01007 Bearing

01121 Shim Pack (3/pkg.)

12,000 RPM, Machine and Motor parts

Always operate, inspect and maintain this tool in accordance with the Safety Code for portable air

tools (ANSI B186.1 and B7.1) and any other applicable safety codes and regulations. Please refer to

Dynabrade's Warning/Safety Operating Instructions for more complete safety information.

WARNING

Right Hand Threads

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 air tools must be used with a Filter-Regulator-Lubricator to maintain all warranties.

Operating Instructions:

Warning: Eye, face 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 over

tightening of inlet bushing and 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:

Products offered by Dynabrade should not be converted or otherwise altered from original design without

the expressed written consent from Dynabrade, Inc.

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 air motors should be lubricated. Dynabrade recommends one drop of air lube per minute for each 10 SCFM (example : if the tool

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

4. An air line filter-regulator-lubricator must be used with this air tool to maintain all warranties. Dynabrade recommends the following: 11289 Air Line

Filter-Regulator-Lubricator — Provides accurate air pressure regulation, two-stage filtration of water contaminants and positive-drip lubrication of

pneumatic components. Operates 40 CFM @ 90 PSI has 3/8" NPT female ports.

5. Gear case of this Dynabrade air tool should be lubricated every 16 hours of use by using 95541 Grease Gun and 95542 Grease.

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

7. A motor tune up kit (P/N 96184) is available which includes assorted parts to help maintain motor in peek operating condition.

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

chlorinated hydrocarbons, or nitro carbons.

Safety Instructions:

• Warning: Eye, face 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.

• 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 30 seconds before application to workpiece to determine if machine is working properly and safely before work begins.

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

• Inspect abrasives and accessories for damage or defects prior to and during operation of tool.

• 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.

Note: To order replacement parts specify the model and serial number of your machine.

Full One Year 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.

(PD96•61)

Disassembly/Assembly Instructions

Important: Manufacturer’s warranty is void if tool is disassembled before warranty expires.

Notice: Dynabrade strongly recommends the use of their 52296 Repair Collar (sold separately) during assembly/disassembly activities. Failure to

use this collar will highly increase the risk of damage to the valve body of this tool. Please refer to parts breakdown for part identification.

Angle-head Disassembly:

1. Disconnect tool from power source. Remove abrasives from tool.

2. Insert tool into padded vise with spindle facing upward.

3. Remove 50384 Spindle Bearing Cover with a pin wrench (left hands threads).

4. Pull spindle assembly from housing.

5. Remove 52089 Washer, 52088 Spacer and 52120 Shim from spindle assembly.

6. Grip onto bevel gear and remove spindle nut (right hand threads). Remove 50412 Felt Ring and 50431 Bearing.

7. Press gear from spindle.

8. Press 50424 Bearing Washer and 12152 Bearing from angle housing by using a push pin thru access hole in top of angle housing.

9. Remove 50511 Screws (2) from housing and 07149 Clamp. Disassemble muffler assembly.

10. Reposition angle housing in vise so motor housing is facing upwards.

11. Slide back 50383 Collar to expose 50381 Lock Nut.

12. Loosen lock nut from angle housing (left hand threads).

13. Separate 01295 Valve Body/Motor Housing from angle housing.

Motor Disassembly:

1. Remove 50381 Lock Nut from 01295 Valve Body/Motor Housing (right hand threads).

2. Pull motor assembly from valve body.

3. Press 50379 Rotor from 02649 Rear Bearing and 01722 Rear Bearing Plate.

4. Remove cylinder and blades.

5. Clamp 50379 Rotor in padded vise with 50363 Pinion facing up and unscrew pinion from rotor.

6. Remove 50332 Pinion Spacer, 01007 Bearings (2), 50368 Bearing Plate and 01010 Spacer from rotor.

Valve Body Disassembly:

1. Position valve body in padded vise with air inlet facing up.

2. Remove air fitting by securing 01494 Inlet Adapter with a wrench and twist air fitting from inlet adapter.

Important: 01494 Inlet Adapter must be secured before attempting to remove air fitting to avoid damaging valve body housing.

3. Remove 53190 Block Plate and 95375 O-ring.

4. Using needle nose pliers, remove 01468 Spring, 01472 Tip Valve and seal.

5. Using a 2.5mm drift pin, tap 01017 Pin from housing and remove throttle lever.

6. Remove 95558 Retaining Ring using retaining ring pliers.

7. Push 01247 Regulator from valve body housing and remove o-rings.

Disassembly complete.

Valve Body Reassembly:

1. Insert 01247 Speed Regulator Assembly with O-rings into valve body. Secure with 95558 Retaining Ring.

2. Secure valve body in padde vise with air inlet facing upwards.

3. Insert 01464 Seal into housing.

4. Line up hole in valve stem with hole in housing (looking past brass bushing). Insert 01472 Tip Valve so that the metal pin passes through the hole in the

valve stem. Install 01468 Spring (small end towards tip valve).

5. Lubricate 95375 O-ring with a slight amount of air-tool oil and install into 53190 Block Plate.

6. Install 53190 Block Plate (O-ring side first) into housing.

7. Apply Hernon #940 PST Pipe Sealant to threads of 01494 Inlet Adapter and install valve body (torque 34 N•m/200 in. - lbs.).

8. Install 57334 Throttle Lever and 01017 Pin.

Motor Reassembly:

1. Place 50379 Rotor in padded vise with threaded spindle facing upward.

2. Slip 01010 Spacer onto rotor shaft.

3. Place a .002" Shim into 50368 Bearing Plate as an initial spacing (Note: 01121 Shim Pack contains .001" and .002" Shims). Slip 01007 Bearings (2)

into bearing plate.

4. Slip bearings and bearing plate onto rotor shaft. Place 50332 Pinion Spacer onto outer race of bearing.

5. Tighten pinion thru pinion spacer onto rotor shaft (torque 17 N•m/150 in. - lbs.).

6. Check clearance between rotor and bearing plate using a .001" feeler gauge. Clearance should be at .001" to .0015". Adjust clearance by repeating steps

1-5 with different shims if necessary. Remove rotor from vise.

7. Once proper rotor gap clearance is achieved, install well lubricated 01185 Blades (4) into rotor slots. Dynabrade recommends using their 95842

Dynabrade Air Lube.

8. Install cylinder over rotor. Be sure air inlet holes of cylinder face away from 50368 Bearing Plate.

(continued on next page)

Motor Reassembly Instructions (continued)

9. Press 02649 Bearing into 01722 Bearing Plate. Press bearing plate and bearing onto rotor. Be sure that pin in bearing plate lines up with pin slot in cylinder.

Important: Fit must be snug between bearing plates and cylinder. If too tight rotor will not turn freely. In this case, rotor must be lightly tapped at press

fit end so it will turn freely while still maintaining a snug fit. A loose fit will not achieve a proper preload of motor bearings and may cause premature wear

and failure of motor.

10. Motor adjustment must now be checked . Pull end of rotor and twist (10-15 lbs. force). Rotor should turn freely without drag. If drag or rub is felt, then

increase preload by removing shim. Also, push end of rotor and twist (10-15 lbs. force). If drag or rub is felt, then deload by adding shim.

11. Position valve body in padded vise with motor cavity facing up.

12. Install motor assembly into housing. Make sure motor drops all the way into housing by aligning air passage way.

13. Install 50383 Collar and 50381 Lock Nut onto valve body housing (left hand threads). Apply Hernon #940 PST Pipe Sealant (or equivalent)

to threads of valve body.

14. Install valve body/motor housing onto angle housing. Apply Hernon #940 PST Pipe Sealant (or equivalent)to threads of angle housing. Tightening 50381

Lock Nut onto housing (left hand threads) (torque 45 N•m/400 in. - lbs.).

Note: Throttle lever must be in desired position before securing 50381 Lock Nut.

Angle-head Reassembly:

1. Position angle housing assembly in padded vise with angle cavity facing up.

2. Install 50424 Bearing Washer into recessed cavity in angle housing.

3. Press 12152 Bearing into recessed cavity against 50424 Bearing Washer.

4. Press bevel gear onto spindle with gear teeth facing up. Press down to shaft step.

5. Slip 50431 Bearing onto spindle until it rests against opposite side of shaft step.

6. Install felt ring over spindle nut. Grip onto bevel gear and install spindle nut (Torque 34 N•m/300 in - lbs.).

7. Place 52088 Spacer over felt ring so that felt ring protrudes thru inner diameter of spacer. Spacer should seat evenly on bearing.

8. Install angle gear assembly into motor housing. Motor should drop completely down in angle housing so the end of the spindle seats into inner diameter of

12152 Bearing. Make sure bevel gear and pinion teeth line up correctly. Push down on the spindle to insure proper seating while rotating 360°. Install

shims from 52120 Shim pack to adjust for backlash or slight clearance from the gear to pinion teeth.

10. Install 52089 Washer into angle housing and over felt ring and spacer. Larger inside diameter of washer goes over felt ring.

11. Install 50384 Spindle Bearing Cover (left hand threads) (Torque 34 N•m/300 in - lbs.).

12. Reassemble muffler assembly as shown on parts breakdown and secure with 50511 Screws (torque 4.5 N•m/40 in - lbs.).

Tool Reassembly Complete.

Important: Grease should be applied to the gears of the tool before operation. Dynabrade recommends using their 95542 Grease and 95541 Grease Gun.

Locate grease fitting in angle housing and inject one full gun load of grease into gear case. Also, 2 or 3 drops of Dynabrade Air Lube (P/N 95842) or

equivalent should be placed directly into air inlet with throttle lever depressed.

Operate tool for 30 seconds prior to application to workpiece to determine if tool is working properly and safely and to let lubricating oils properly penetrate

motor parts. 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.

Optional: (To adjust throttle lever position)

1. Secure valve body in softjaw vise with 50362 Angle Housing facing up.

2. Slide Back 50383 Collar to expose 50381 Lock Nut.

3. Using a 34.0 mm crows foot, and firmly holding motor housing, turn lock nut counter clockwise to loosen assembly.

4. Reposition throttle lever to desired position. Allow for additional rotation due to torquing.

5. Using the 34.0 mm crows foot and a torque wrench, tighten lock nut (45 N•m/400 in - lbs.).

Note: Hold motor housing firmly to reduce housing rotation.

6. Replace collar and remove from vise.

DYNABRADE

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., Zone Artisanale • L-5485 Wormeldange—Haut, Luxembourg • Telephone: 352 76 84 94 • Fax: 352 76 84 95

Dynabrade Air Lube