GA7020-TE, MAKITA Budowa, Instrukcje serwisowe
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//-->TECHNICAL INFORMATIONGA7020/ GA7020S, GA7021, GA9020/ GA9020SModel No.DescriptionPRODUCTP1/6LAngle Grinders 180mm (7')/ 230mm (9')CONCEPT AND MAIN APPLICATIONSThe above products have been developed as the successormodels to the current 9067/ 9069 series models, featuringdurability higher than the predecessors.Also the following optional accessories will providemore comfort and control;*Vibration absorbing side grip for comfortable work*Toolless wheel cover for quick adjustment*Dust cover attachmentGA7020S and GA9020S feature soft start.GA7021 is designed on GA7020 for low-speed and high-torque.HWDimensions: mm (")GA7020GA9020Model No.GA7020SGA9020SGA7021Length (L)473 (18-5/8)Width (W) 200 (7-7/8) 249 (9-3/4)Height (H)140 (5-1/2)SpecificationVoltage (V)110120220230240Model No.DiameterHole diameterNo load speed: min-1=rpm.Soft start featureAC/DC switchDouble insulationPower supply cord: m (ft)Net weight: kg (lbs)Wheel size: mm (")Current (A)151510.510.19.6Cycle (Hz)50/ 6050/ 6050/ 6050/ 6050/ 60GA7020Continuous Rating (W)InputOutput1,6501,100---1,1002,2001,4002,2001,4002,2001,400GA7020S180 (7)22.23 (7/8)8,500NoYesNoYesc) YesYesAustralia, New Zealand: 2.0 (6.6), Other countries: 2.5 (8.2)4.7 (10.4)b) 6,600NoGA7021GA9020Max. Output (W)2,7502,7503,3003,3003,300GA9020S230 (9)a) Differs by country.b) 6,000 for USA, Guam, Panamac) Exclusively for North American countriesStandard equipmentLock nut wrench 35 ......... 1 pcSide grip 36 ...................... 1 pcNote:The standard equipment for the tool shown above may differ by country.OptionalaccessoriesVibration absorbing side gripToolless quick adjustable wheel coverDust cover attachmentGA7020/ GA7020S, GA7021: Assorted accessories for 180mm angle grinderGA9020/ GA9020S: Assorted accessories for 230mm angle grinderP2/ 6RepairCAUTION: Remove the wheel from the machine for safety before repair/ maintenance ![1] NECESSARY REPAIRING TOOLSCode No.1R0481R0491R2691R0051R165DescriptionDrill chuck remover 11Drill chuck remover 15Bearing extractorRetaining ring R pliersRing spring setting tool BUse forRemoving Spiral bevel gear 53Removing Spiral bevel gear 53Removing Ball bearingsRemoval/installation of Retaining ring R-42Assembling Spiral bevel gear 53[2] LUBRICATIONPut approx. 60g of Makita grease SG No.1 in the gear room of Gear housing complete to protect parts and product fromunusual abrasion.[3] DISASSEMBLY/ASSEMBLYImportant:As listed below, different gears are used for GA7020/GA7020S and GA9020/GA9020S/GA7021,and they are not interchangeable between the models. Be careful not to confuse them.Model No.No load speed: min-1Small spiral bevel gear(Gear on Armature shaft)Spiral bevel gear 16GA7020GA7020SNumber of teeth: 168,500groovedSpiral bevel gear 12GA9020GA9020SGA7021Number of teeth: 126,600(USA, Guam: 6,000)not groovedSpiral bevel gear 53ANumber of teeth: 53Large spiral bevel gear(Gear on Spindle)Spiral bevel gear 53BNumber of teeth: 53[3] -1. Armature, Small spiral bevel gear, Ball bearing 6301DDWDISASSEMBLING1) After removing Carbon brush, separate the assembly of Gear housing complete with Armature from Motor housingcomplete by unscrewing four M5x35 Tapping screws.2) Separate Bearing box from Gear housing complete by unscrewing four M6x22 Hex socket head bolts.3) With Armature securely held by hand, remove Hex nut M8 from the drive-end of Armature shaft by turningcounterclockwise with wrench 13. (Fig.1)4) Hold Small spiral bevel gear by hand, then pull off Armature from Gear housing complete. (Fig.2)Note:If it is difficult to pull off Armature by hand, do the following steps.1. Lubricate small spiral bevel gear and Armature shaft with spray lubricant.2. Wrap the gear with cloth to protect the gear teeth.3. Using water pump pliers or the like, firmly grip the gear wrapped with cloth, then turn the gear.Fig. 1Fig. 2Hex nut M8Small spiral bevel gearGear housing complete,viewed from the wheelinstallation sideP3/ 6Repair[3] -1. Armature, Small spiral bevel gear, Ball bearing 6301DDW (cont.)DISASSEMBLING5) In order to remove Ball bearing 6301DDW from gear housing complete, first remove Retaining ring R-42 withRetaining ring R pliers RT-2N (No.1R005), and remove Flat washer 20 from Gear housing complete. (Fig.3)6) Reassemble Armature to Gear housing complete, then the spiral bevel gear to Armature shaft. Tighten Hex nut M8provisionally by turning clockwise. (Refer toFig. 2, 1)7) By tapping the end of Gear housing complete with a plastic hammer, Ball bearing 6301DDW can be removed togetherwith Armature. (Fig.4)8) Remove Ball bearing 6200DDW from Armature with Bearing Extractor (No.1R269). (Fig.5)Fig. 3Fig. 4Hex nut M8Flat washer 20Retaining rig R-42Small spiral bevel gearBall bearing 6301DDWFig. 5Ball bearing 6301DDWSmall spiral bevel gearHex nut M8No.1R269Ball bearing 6301DDWBall bearing 6200DDWASSEMBLING1) Mount Ball bearing 6301DDW on Armature by hand, then insertinto the bearing installation hole of Gear housing, (Fig. 8)Then pull off Armature.2) Put Flat washer 20 onto Ball bearing 6301DDW, and fasten withRetaining ring R-42.3) Then do the reverse of the disassembling steps.Fig. 6Ball bearing 6301DDWP4/ 6Repair[3] -2. Large spiral bevel gear and Ball bearing 6203DDWNote:The gear and the ball bearing can be replaced without disassembling the Motor section.DISASSEMBLING1) Separate Bearing box from Gear housing complete by unscrewing four M6x22 Hex socket head bolts.It is not necessary to remove Carbon brushes.2) Remove Ball bearing 6000ZZ with Bearing Extractor (No.1R269). (Fig.7)3) Insert two Drill chuck removers (No.1R048, 1R049) between Large spiral bevel gear and Bearing box,and set the Bearing box on the turn base of arbor press so that the wheel cover installation surface ofBearing box is placed on the edge of the U-shaped notch of the turn base.Then remove spindle by pressing down with arbor. (Fig.8)Fig. 7Fig. 8Drill Chuck Remover 11(No.1R048)No.1R269Drill Chuck Remover 15(No.1R049)Large spiral bevel gearBall bearing 6000ZZBearing boxSpindleU-shaped notch of arbor pressFig. 9Pan head screwM5x16 (3 pcs)Bearing retainer 504) After removing Large spiral bevel gear, separate Bearing retainer 50by removing three M5x16 Pan head screws. (Fig.9)5) Remove Ball bearing 6203DDW by hitting Bearing box straight downagainst flat surface of work-bench. (Fig.10)If cannot be removed, use arbor press and a round bar for arbor ofan appropriate size as illustrated inFig. 11.Fig. 10Fig. 11Round bar for arborBall bearing6203DDWP5/ 6Repair[3] -2. Large spiral bevel gear and Ball bearing 6203DDW (cont.)ASSEMBLINGDo the reverse of the disassembling steps.How to assemble Spindle to Large spiral bevel gearSeeFig. 12.1) In order not to damage the gear teeth of Large spiral bevel gear, put it on Ring spring setting tool B (No.1R165).2) After assembling Ball bearing 6203DDW to Bearing box, put Bearing box on Large spiral bevel gear.3) Then press-fit Spindle into Large spiral bevel gear using arbor press.Fig. 12Bearing boxTurn over.diameter 58mmSpindlediameter 40mmLarge spiral bevel gearNo.1R165[3] -3. Shaft LockDISASSEMBLING1) Remove Bearing box from Gear housing.2) Pull off Shoulder pin 5 with pliers while pushing Pin cap with afinger. (Fig.13)Note:Do not pull off shoulder pin 5 without holding pin cap becauseCompression spring 12 would sling Pin cap.ASSEMBLINGFollow the reverse of disassembling steps.Note:Do not reinstall removed Pin cap because removal of Shoulderpin 5 damages the inside surface of Pin cap. Be sure to removeplastic dust of Pin cap from Shoulder pin 5 and to install it ontoa brand-new Pin cap.Fig. 13Shoulder pin 5Compressionspring 12Gear housingPin cap
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