Hymair AT-280 User manual

6 D. A. Sander (Model AT-280)
Copyright to be reserved by Hymair Revision: 01 (2004)
INSTRUCTION MANUAL
Thanks for your purchasing our air tools
and please read this Instruction Manual carefully
and thoroughly before operating the tool to do your best jobs.

A. Features & Functions
* Swivel-free finishesfrom its dualaction pad motion.
* Built-in regulatorfor positive speedcontrol.
* Orbital sanderprovides a pattern-lessfinish.
* Rotary actionassures smooth andcirculating sanding.
* Most suitable for sanding jobs like feather edging, metal preparation and blending
body filler andany other sandingpurposes.
B. Operating Instructions
1. Only use PAPER discs with a proper adhesive. If you need to use Velcro Face
backing pad, thena correspondent paperdisc is required.
2. RPM ratingfor accessories shouldbe equal or exceed the recommended speed of the
sander.
3. Fit the paper disc onto the backing pad and fit the backing pad to the thread of the
sander spindle. Makesure that thebacking pad isfixed tight enough.
4. Let the sander do the work by pressing down the lever throttle to a certain degree
where you wantto obtain acertain speed.
5. Do notput additional bigpressure on thetool at operation.
6. Once the sander is started, immediately set it down evenly and move it slowly back
and forth on overlapping areas. When the work is finished, lift the sander off the
working area before stopping the motor.
* Notes:
- Start sanding jobwith abrasive gritjust coarse enoughto remove thespots and
roughness. Follow withadditional sanding offiner grit untildesired finish is
required.
- Swirl marks madeby coarse abrasiveare difficult to remove. Never go from a
coarse grit toan immediate finegrit IN ONESTEP toavoid any repeatedjobs in
the whole procedure.
C. Air Supply (please refer to the diagram below)
1. Make sure that the air compressor being used for the air tool operation supplies the
correct output (CFM).
2. Turnthe throttle inthe off position when connectingthe tool tothe air supply.
3. Use normal90psi (or rangingfrom 6.0 to 8.0kg.) air pressure while running the tool.
High pressure and unclean air will shorten the tool’s life due to faster wear and also
may create ahazardous situation.
4. Drain the air tank daily. Water in the air line may enter the tool and damage the tool
mechanism at theoperation.
5. Clean theair inlet filter cartridge weekly. The recommended hook-up procedure can
be viewed inthe diagram below.
6. Line pressure should be increased accordingly to make up for extra long air hoses
(usually over 8 meters). The minimum hose diameter should be 1/4 I.D. and the
fittings should have the same inside dimensions. But usually a 3/8 I.D. air hose is
recommended for airsupply to getthe best functionof air tooloperation.
7. Use properhoses and fittings.We do not suggest connecting quick change couplings
directly to the tool since they may cause failure due to vibration. Instead, add a
leader hose andconnect coupling betweenair supply andhose whip.
8. Keep hoses away from the heat, oil and sharp edges. Check hoses for wear before
individual use. Makecertain that allconnections are insecurity.
D. Safety Instructions
1. Approved eye protector must be worn at all times. Be sure to use a dust mask since
the tool operation may creates dust which is harmful to health. If necessary, ear
protector and glovesshould be used.
2. Always keep good balance of body and footing. Secure work with clamps or vice so
both hands canbe free tooperate the tool.
3. Be sure all clothing is tight to prevent entanglement with running tools. Remove
your jewelry andwatch for safetypurpose.
4. Be sure that working area is clear of foreign objects and that no people are within
immediate access of tool operation scope. The working place shall be well
ventilated.
5. Disconnect theair hose beforechanging or adjustingany inserted tools/accessories.
6. Be surethe tool isin off position before connectingit to theair hose.
7. Disconnect the tool when it is not in use. Release the on-off device in case of energy
supply failure.
8. Never carrytool by hose.
E. Maintenance And Lubrication
1. If you are not using an air line oiler, lubricate the air motor by using an oil pot or an
oil injector through the air inlet and then run the tool. Several drops of SAE #10
6. Shut Off Valve
7. Whip Hose
8. Coupler Body And Connector
9. Drain Daily
10. 1/2” Or Larger Pipe And Fitting
1. Air Tool
2. Air Hose 3/8”(I.D.)
3. Oiler
4. Pressure Regulator
5. Filter
11. Air Dryer
12. 1” Or Larger Pipe And Fitting
13. Air Compressor
14. Auto Drain
15. Drain Daily
AIR SYSTEM LAYOUT
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lubricant or sewing machine lubricant is acceptable for this purpose. Do not use
detergent oil.
2. Before connectingthe hose for operation, apply 4 or 5 drops of #10 spindle oil at the
air inlet.Avoid the misuse of thicker oil which may lead to the reduced performance
or malfunction.
3. Oiling isnecessary within 1or 2 hoursof continuous operation.
4. Afteroperation, take off the airhose and pour 4 or 5 drops of #60 spindle oil into the
air inlet, then connect the hose again to run the tool for a few seconds, which can
prolong the toollife.
5. Clean airinlet filter cartridgeon the airline weekly.
F. Warnings
1. Never usethe tool inpotentially explosive atmospheres.
2. Keep your body in well balanced position and always wear gloves to reduce the risk
of crushing causedby torque betweena reaction barand work-piece.
3. Unexpected tool movement due to reaction forces or breakage of inserted tool or
reaction bar maycause injuries.
4. Prevent long hair or loose clothing from drawing in while operating the tool. You
may get the risk of being injured if the handkerchief, necktie etc. are not kept away
from the runningtool.
5. The noise emission (sound pressure level) at the workplace may exceed the normal
standard ---usually 85dB(A).In this case,a quality earprotector should beused.
6. Unexpected directionof inserted toolmovement could casea hazardous situation.
7. Slip / Trip / Fall is a major cause of serious injury or even death. Be aware of excess
hose left on your walking way or on the working surface and be aware of the
whipping air hosetoo.
8. Excessive high air pressure and too much free rotation may speed up the wear of the
tool and maycause dangerous situation.
9. Continuous operation and bad working condition will injure hands. Once hand
numbs or aches , operator shall stop the tool for a while for relaxing and re-start the
work after recovery. Operator shall immediately see a doctor if such a serious
symptom occurs.
10. Never change the inner construction and design, which may cause a danger in
operation.
G. General Trouble Shooting
* Troubles:
- Tool does not run at a normal speed or ata variable speed
- The motor blocks
- Automotive start whenconnected to compressedair
- Torque reduces
- Abnormal vibrating -Easy hot rising atthe housing
* Causes:
- Air supply isnot enough (airpressure not ina required standard)
- Speed controller/switch breaksdown
- Rotor blades breakor wear out
- Dust gets intothe motor
- Throttle lever orstarting trigger malfunctions
- Air leakage atthe inlet orsomewhere else
- Bearing(s) damages
- Correspondent O-ring(s) wearsout or outof position
- Lack of lubricating
* TroublesShooting:
- Check the airhose to seewhether it isblocked or twistedfor less airsupply.
- Check the aircompressor to gainthe correct airpressure required.
- Replace rotor blades
- Disassemble the tooland clean theinner structure underproper instructions
- Check and fixthe throttle leveror starting triggerfor accurate operation
- Check the airleakage and fixit under properinstruction
- Replace new bearing(s)
- Replace the damagedO-ring(s) or putit back incorrect position
- Oil / Lubricatethe tool consistentlyuntil it gainsthe right speedand torque
* Note:
For any otherspecial troubles whichcannot be settleddown by theoperator, please
Contact the sellingagent from whomyou purchase thetool.
H. Storage
Avoid to store the tool in a location subject to high humidity, which may result in rusty
mechanism inside thetool. Before storing,oil the toolat the airinlet with proper
spindle oil andrun it fora few seconds.
I. Disposal
When the toolis seriously damagedor out oflife, leave itin a resourcerecycling can.
Never drop itinto fire.
J. Ordering Spare Parts
1. Contact thesale agent from whom you purchase the tool for spare parts ordering for
any necessary replacementfor continuous useof tool andextending the toollife.
2. In ordering spare parts and components, give each spare part number and order
quantity.
Thank you.

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6” Dual Action Air Sander (Model: AT-280)
SPARE PARTS LIST
TECHNICAL DATA:
* Free Speed: 10,000 rpm * Air Inlet: 1/4” BSP or NPT
* Air Hose(ID): 3/8” * Avg.Air Consumption: 4 CFM(115 l/min)
Part No.
Description
Qty.
Part No.
Description
Qty.
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02
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Screw
Flat Washer
Wave Washer
Spindle Lock
Spacer
Wave Washer
Hex Nut
6” Sanding Pad
Retaining Ring
Wave Washer
Drive Spindle
Ball Bearing
Front Screw
Orbital Hub
Socket Screw
Rotor Shaft
Hem
Ball Bearing
End Plate
Rotor
Rotor Blade
Cylinder
Locating Pin
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 5 1 1
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Retaining Pin
Cap Screw(S)
Cap Screw(L)
Drive Housing
Gasket
Motor Housing
Housing Cover
Valve-Speed Regulator
O-Ring
Ring-Retaining
Throttle Valve Spring
O-Ring
Valve Stem
O-Ring
O-Ring
Valve Body
Bracket
Hinge Screw
Hex Nut
Hex Nut
Throttle Lever
Handing Cover
Hose Adapter
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