第八章 北方重型汽车车桥的维修.pdf

北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-1 第八章第八章第八章第八章 车车车车桥的桥的桥的桥的维修维修维修维修 CHAPTER 8 MAINTENANCE OF FRONT/REAR AXLES 页码 Page 第八章 车桥的维修.1 CHAPTER 8 MAINTENANCE OF FRONT/REAR AXLES.1 第一节 桥总成拆卸、装配、使用、保养.7 SECTION 1 DISASSEMBLING，ASSEMBLING，OPERATION AND MAINTENANCE OF AXLE ASSEMBLY.7 8.1 转向前桥总成部件图爆炸图.7 EXPLOSIVE VIEW OF FRONT STEERING AXLE ASSEBLY.7 8.2 转向主销安装要求、技术参数.9 INTALLATION REQUIREMENTS AND TECHNICAL PARAMETERS OF STEERING KING PIN.9 8.3 轮毂轴承、油封的更换、技术参数、力矩值.11 REPLACEMENT,TECHNICAL PARAMETERS AND TORQUE VALUE OF HUB BEARING AND OIL SEAL.11 8.4 转向角、前束技术参数、调整方法、力矩值.14 TECHNICAL PARAMETERS，ADJUSTING METHOD AND TORQUE VALUE OF STEERING ANGLE AND TOE-IN.14 8.5 非贯通式驱动桥主减速器总成爆炸图.15 EXPLOSIVE VIEW FOR MAIN RETARDER OF NON-THROUGH DRIVING AXLE.15 8.6 非贯通式主减速器安装要求、技术参数、调整方法、力矩值.17 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF NON-THROUGH MAIN TRTARDER.17 8.7 主减速器油封的更换.18 REPLACEMENT OF OIL SEAL OF MAIN RETARDER.18 8.8 贯通式主减速器的安装要求、技术参数、调整方法、力矩值.19 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-2 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF THROUGH MAIN TRTARDER.19 8.9 贯通式主减速器差速器的安装要求、技术参数、调整方法、力矩.19 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF THROUGH MAIN RETARDER.19 8.10 桥间闭锁机构安装要求、技术参数、调整方法、力矩值.21 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF INTER-AXLE LOCKING MECHANISM.21 8.11 差速器总成爆炸图.22 EXPLOSIVE VIEW OF DIFFERENTIAL ASSEMBLY.22 8.12 差速器安装要求、技术参数、调整方法、力矩值.23 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF DIFFERENTIAL.23 8.13 轮间闭锁机构安装要求、技术参数、调整方法、力矩值.24 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF WHEEL LOCKING MECHANISM.24 8.14 贯通传动轴总成爆炸图.25 EXPLOSIVE VIEW OF THROUGH DRIVE AXLE.25 8.15 贯通传动轴安装要求、技术参数、调整方法、力矩值.27 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF THROUGH DRIVE SHAFT.27 8.16 贯通传动轴油封的更换.28 REPLACEMENT OF OIL SEAL OF THROUGH DRIVE SHAFT.28 8.17 轮边减速器总成爆炸图、轮毂总成爆炸图.29 EXPLOSIVE VIEW OF HUB REDUCTOR AND HUB.29 8.18 轮边减速器安装要求、技术参数、调整方法、力矩值.31 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF HUB REDUCTOR.31 8.19 轮毂安装要求、技术参数、调整方法、力矩值.34 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF HUB 34 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-3 8.20 轮毂轴承、油封的更换.35 REPLACEMENT OF BEARING AND OIL SEAL OF HUB.35 8.21 制动器总成爆炸图.36 EXPLOSIVE VIEW OF BRAKE ASSEMBLY.36 8.22 制动凸轮安装要求、技术参数、调整方法、力矩值.39 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF BRAKE CAM.39 8.23 制动器安装要求、技术参数、调整方法、力矩值.39 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF BRAKE.39 8.24 制动调整臂安装要求、技术参数、调整方法、力矩值.39 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF BRAKE ADJUSTING ARM.39 8.25 制动摩擦片的更换.40 REPLACEMENT OF BRAKE LINING.40 8.26 桥使用与保养.41 OPERATION AND MAINTENANCE OF AXLES.41 第二节 维修程序.44 SECTION 2 MAINTENANCE PROCEDURE.44 8.27 前、后桥油面检查.44 CHECKING OIL LEVEL OF FRONT AND REAR AXLE.44 8.28 检查轮边油面.45 CHECKING OIL LEVEL OF WHEEL HUB.45 8.29 前后桥换油.46 CHANGING OIL FOR FRONT AND REAR AXLES.46 8.30 轮边换油.47 CHANGING OIL OF WHEEL HUB.47 8.31 检查加注转向节轴承座润滑油.48 CHECKING AND REFILLING LUBRICATING OIL OF STEERING KNUCKLE BEARING SEAT.48 8.31 检查加注转向节轴承座润滑油-续.49 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-4 CHECKING AND REFILLING LUBRICATING OIL OF STEERING KNUCKLE BEARING SEAT-CONTINUED.49 8.32 注驱动轴的润滑脂.50 FILLING GREASE FOR DRIVING AXKE.50 8.33 清理前、后桥通风孔并加装通风软管.51 CLEANING OF BREATHER HOLES AND FITTING BREATHER HOSE FOR FRONT AND REAR AXLES.51 8.33清理前、后桥通风孔并加装通风软管-续.52 CLEANING OF BREATHER HOLES AND FITTING BREATHER HOSE FOR FRONT AND REAR AXLES-CONTINUED.52 8.33 清理前、后桥通风孔并加装通风软管-续.53 CLEANING OF BREATHER HOLES AND FITTING BREATHER HOSE FOR FRONT AND REAR AXLES-CONTINUED.53 8.34 检查、调整驱动前桥限位螺栓.54 CHECKING AND ADJUSTING OF FRONT DRIVING AXLE LIMING BOLT.54 8.34 检查、调整驱动前桥限位螺栓-续.55 CHECKING AND ADJUSTING OF FRONT DRIVING AXLE LIMING BOLT-CONTINUED.55 8.35 调整前桥前束.56 ADJUSTING OF TOE-IN OF FRONT AXLE.56 8.35 调整前桥前束-续.57 ADJUSTING OF TOE-IN OF FRONT AXLE-CONTINUED.57 8.35 调整前桥前束-续.58 ADJUSTING OF TOE-IN OF FRONT AXLE-CONTINUED.58 8.36 加注制动凸轮轴的润滑脂.59 FILLING LUBRICATING GREASE FOR BRAKE CAMSHAFT.59 8.36注制动凸轮轴的润滑脂-续.60 FILLING LUBRICATING GREASE FOR BRAKE CAMSHAFT-CONTINUED.60 8.37 检查分动器油面.61 CHECKING OF OIL LEVEL OF TRANSFER CASE.61 8.38 分动器加油.62 FILLING OIL FOR TRANSFER CASE.62 8.39 检查、紧固分动器关重螺栓.63 CHECKING AND FASTENING KEY AND IMPORTANT BOLTS FOR TRANSFER CASE.63 8.39 检查、紧固分动器关重螺栓-续.64 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-5 CHECKING AND FASTENING KEY AND IMPORTANT BOLTS FOR TRANSFER CASE-CONTINUED.64 8.40 更换桥总成.65 REPLACING OF FRONT AXLE ASSEMBLY.65 8.40更换前桥总成-续.66 REPLACING OF FRONT AXLE ASSEMBLY-CONTINUED.66 8.40更换前桥总成-续.67 REPLACING OF FRONT AXLE ASSEMBLY-CONTINUED.67 8.40更换前桥总成-续.68 REPLACING OF FRONT AXLE ASSEMBLY-CONTINUED.68 8.41 更换转向横拉杆总成.69 REPLACING STEERING CROSS LEVER ASSEMBLY-CONTINUED.69 8.41更换转向横拉杆总成-续.70 REPLACING STEERING CROSS LEVER ASSEMBLY-CONTINUED.70 8.41更换转向横拉杆总成-续.71 REPLACING STEERING CROSS LEVER ASSEMBLY-CONTINUED.71 8.42 更换转向横拉杆臂.72 REPLACING OF STEERING CROSS LEVER ARM.72 8.42更换转向横拉杆臂-续.73 REPLACING OF STEERING CROSS LEVER ARM-CONTINUED.73 8.42更换转向横拉杆臂-续.74 REPLACING OF STEERING CROSS LEVER ARM-CONTINUED.74 8.43 更换后桥总成.75 REPLACING OF REAR AXLE ASSEMBLY.75 8.43更换后桥总成-续.76 REPLACING OF REAR AXLE ASSEMBLY-CONTINUED.76 8.43更换后桥总成-续.77 REPLACING OF REAR AXLE ASSEMBLY-CONTINUED.77 8.44 更换制动器.78 REPLACING OF BRAKE.78 8.45更换制动器-续.79 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-6 REPLACING OF BRAKE-CONTINUED.79 8.45更换制动器-续.80 REPLACING OF BRAKE-CONTINUED.80 8.45更换制动器-续.81 REPLACING OF BRAKE-CONTINUED.81 8.45 更换分动器总成.82 REPLACING OF TRANSFER GEAR ASSEMBLY.82 8.46更换分动器总成-续.83 REPLACING OF TRANSFER GEAR ASSEMBLY-CONTINUED.83 8.46更换分动器总成-续.84 REPLACING OF TRANSFER GEAR ASSEMBLY-CONTINUED.84 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-7 第一节第一节第一节第一节 桥总成拆卸桥总成拆卸桥总成拆卸桥总成拆卸、装配装配装配装配、使用使用使用使用、保养保养保养保养 SECTION 1 DISASSEMBLING，ASSEMBLING，OPERATION AND MAINTENANCE OF AXLE ASSEMBLY 8.1 转向前桥总成部件图爆炸图转向前桥总成部件图爆炸图转向前桥总成部件图爆炸图转向前桥总成部件图爆炸图 EXPLOSIVE VIEW OF FRONT STEERING AXLE ASSEBLY 6 15 36 35 20 11 13 32 31 7 12 14 15 4 5 6 9 16 19 21 22 23 24 29 30 33 36 35 34 1 2 3 8 17 18 25 28 26 27 40 39 38 37 42 41 43 44 45 47 46 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-8 1 前桥桥体 11 密封环 21 轮辐 31 锁紧垫圈 41 横拉杆总成 Front axle body Seal ring Spoke Locking washer Tie-rod assy.2 转向节 12 密封环 22 螺栓 32 螺栓 42 万向球头 Steering knuckle Seal ring Bolt Bolt Universal ball joint 3 衬套 13 端盖 23 压板 33 制动毂 43 卡环 Bush End cap Pressure plate Brake drum Snap ring 4 限位螺栓 14 润滑油嘴 24 螺母 34 衬环 44 密封罩 Limit bolt Grease fitting Nut Bushing ring Seal cover 5 螺母 15 卡环 25 圆锥滚柱轴承 35 锁紧垫圈 45 螺母 Nut Snap ring Taper roller bearing Locking washer Nut 6 螺塞 16 油管 26 止推垫圈 36 螺栓 46 夹箍 Screw plug Oil pipe Thrust washer Bolt Clamp 7 调整片 17 密封环 27 螺母 37 转向节臂 47 螺栓 Adjusting shim Seal ring Nut Steering knuckle arm Bolt 8 圆锥滚柱轴承 18 圆锥滚柱轴承 28 螺栓 38 螺栓 48 螺母 Taper roller bearing Taper roller bearing Bolt Bolt Nut 9 转向节销 19 前轮毂 29 密封垫 39 横拉杆臂 Steering knuckle pivot Front wheel hub Seal ring Tie-rod arm 20 前轮轮胎螺栓 30 轮毂帽 40 螺栓 Bolt of front tyre Hub cap Bolt 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-9 8.2 转向主销安装要求转向主销安装要求转向主销安装要求转向主销安装要求、技术参数技术参数技术参数技术参数 INTALLATION REQUIREMENTS AND TECHNICAL PARAMETERS OF STEERING KING PIN 转向主销的安装 Installation of steering king pin（1）前桥转向节端部安装间隙要求尽量小，装入合适的调整垫以得到规定的间隙，调整垫厚度1.8mm-2.6mm，装配间隙0 01-0.1 mm。The installation clearance on the end of front axle steering knuckle should be as small as possible,proper adjusting shim shall be used to get required clearance,the thickness of adjusting shim is 1.8mm-2.6mm,and the assembling clearance is 001-0.1 mm.（2）使用对中冲头将转向节、止推轴承和精确厚度的调整垫与桥体主销孔对中装配。Use aligning punch to make steering knuckle,thrust bearing and the adjusting shims in accurate thickness align with the king pin hole of axle body and assemble them.（3）在转向节底部插入合适的密封环，装入卡环。Put a proper seal ring on the bottom of steering knuckle,and fit snap ring.（4）使用主销孔加热器（389 589 03 63 00）加热主销孔最高到150度，插入主梢。Use king pin hole heater（389 589 03 63 00）to heat the king pin hole to max.150 and insert the king pin into the hole.注:Note:主销插入主销孔内时不要润滑。No lubrication is needed when inserting the king pin into the pin hole.（5）在转向节顶部和底部安装垫圈和密封环，并装入卡环。Fix washer and seal ring on the top and bottom of steering knuckle,and then install snap ring.北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-10 定位参数 Locating parameters 主销后倾角：212 Caster angle:212 主销内倾角：515 King pin inclination:515 前轮外倾角：1 Front wheel camber:1 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-11 8.3 轮毂轴承轮毂轴承轮毂轴承轮毂轴承、油封的更换油封的更换油封的更换油封的更换、技术参数技术参数技术参数技术参数、力矩值力矩值力矩值力矩值 REPLACEMENT,TECHNICAL PARAMETERS AND TORQUE VALUE OF HUB BEARING AND OIL SEAL 拆卸 Removal 将制动毂从轮毂上拆下,拧下轮毂，轮毂帽螺栓,取下轮毂帽及密封垫。Remove brake drum from wheel hub,screw off the bolts on hub cap,and remove the hub cap and seal pad.拧松夹紧螺栓螺母，用专用扳手（389 589 00 13 00）松开锁紧螺母并拆下止推垫圈，卸下轮毂。Unscrew clamping bolt and nut,use special wrench（389 589 00 13 00）to loosen the locking nut and remove the thrust washer,then demount the wheel hub.注意:Note:北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-12 如果内圆锥滚柱轴承卡死，可用拉力器（001 589 28 33 00）和夹具（001 589 37 33 00）从转向节内将轴承拉出。If inner taper roller bearing is jammed,use puller(001 589 28 33 00)and fixture（001 589 37 33 00）to pull the bearing out of steering knuckle.（1）使用装有中间支架（000 589 35 33 00）和拉出器（000 589 68 33 00）的组合工具从轮毂中拉出内、外圆锥滚柱轴承、座圈及径向密封环。Use the combined tool with middle bracket(000 589 35 33 00)and puller(000 589 68 33 00)to pull out the inner and outer taper roller bearings,race and radial seal ring from wheel hub.（2）清洗所有零件，检查有无磨损。Rinse all parts,and check them for wearing.安装 Installation（1）使用冲头将内圆锥滚柱轴承的外座圈压入轮毂。Press the outer race of inner taper roller bearing into hub by using of punch.（2）按规定填充润滑脂，确保轴承充分润滑。Fill grease in the bearing as required,ensuring full lubrication of bearing.（3）将内圆锥滚柱轴承内环装入轮毂，再用冲头把径向密封环敲入轮毂。Install the inner ring of inner taper roller bearing into hub,and then use a punch to strike radial seal ring into hub.（4）把轮毂安放在转向节上，用冲子将外圆锥滚柱轴承压在转向节上。Place hub onto steering knuckle,and use a punch to press the outer taper roller bearing onto the steering knuckle.（5）安装止推垫圈拧紧锁紧螺母到 240Nm，使轮毂能平稳地旋转，再将锁紧螺母倒回60。Install thrust washer and tighten locking nut to 240Nm to make the hub rotating smoothly,then turn the locking nut backwards for 60.注意 Note:轮毂启动力矩为30-50Nm。Starting torque of wheel hub is 30-50Nm.用拧松和拧紧锁紧螺母的方法调整轮毂启动力矩，反复操作至正确值为止。Loosen or tighten the locking nut to adjust startup torque of hub until the torque reaches the correct value.夹紧螺栓、螺母：M101.5-10.9；力矩：55-65Nm Clamping bolt and nut:M101.5-10.9;torque:55-65Nm.北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-13 （6）将垫片和轮毂，轮毂帽装到轮毂上，按规定扭矩紧固螺栓。Fit washer and hub cap onto the hub,and tighten the clamping bolt as specified.（7）把制动毂装到轮毂上。Install brake drum onto the hub.北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-14 8.4 转向角转向角转向角转向角、前束技术参数前束技术参数前束技术参数前束技术参数、调整方法调整方法调整方法调整方法、力矩值力矩值力矩值力矩值 TECHNICAL PARAMETERS，ADJUSTING METHOD AND TORQUE VALUE OF STEERING ANGLE AND TOE-IN 前束值为A-B=01mm。汽车每行驶5000km，必须检查一次前束值。Toe-in is A-B=01mm.check the toe-in once when vehicle runs for every 5000km.前束调整方法 Adjusting method of toe-in:将汽车停在平整的场地上，用起重器（千斤顶）顶起前轴，使车轮处于直线行驶位置。Park the truck on a flat ground,jack up the front axle with a jack,and make the wheel in the straight line running position.将左、右横拉杆接头的紧固螺母松开，转动横拉杆，使前轮落地后的前束值为01mm。Loosen the fastening nuts on left and right tie-rod joints,turn tie rod to make that the toe-in value of front wheels is 01mm after falling to the ground.拧紧横拉杆接头螺栓螺母。Tighten the nuts of tie-rod joint bolt.北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-15 8.5 非贯通式驱动桥主减速器总成爆炸图非贯通式驱动桥主减速器总成爆炸图非贯通式驱动桥主减速器总成爆炸图非贯通式驱动桥主减速器总成爆炸图 EXPLOSIVE VIEW FOR MAIN RETARDER OF NON-THROUGH DRIVING AXLE 3 1 2 4 5 6 7 10 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-16 1 带轴承盖的主减速器壳总成 6 齿轮副 11 调整垫 16 密封圈 21 螺栓 Final drive housing assembly with bearing cap Gear pair Adjusting shim Seal ring Bolt 2 圆柱销 7 小齿轮壳 12 圆锥滚子轴承 17 螺栓 22 端盖 Cylindrical pin Pinion housing Taper roller bearing Bolt End cap 3 螺栓 8 挡油盘 13 密封环 18 法兰 23 密封垫 Bolt Oil shield Seal ring Flange Seal pad 4 销 9 圆锥滚子轴承 14 十二方螺母 19 防尘罩 24 六角螺栓 Pin Taper roller bearing Bihexagon nut Dust-proof boot Hex bolt 5 卡环 10 隔套 15 调整垫 20 螺栓 Snap ring Spacer sleeve Adjusting shim Bolt 北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-17 8.6 非贯通式主减速器安装要求非贯通式主减速器安装要求非贯通式主减速器安装要求非贯通式主减速器安装要求、技术参数技术参数技术参数技术参数、调整方法调整方法调整方法调整方法、力矩值力矩值力矩值力矩值 INSTALLATION REQUIREMENTS,TECHNICAL PARAMETERS,ADJUSTING METHOD AND TORQUE VALUE OF NON-THROUGH MAIN TRTARDER 十二方螺母14的拧紧力矩为800-900Nm。Tightening torque of bi-hexagon nut is 800-900Nm.径向密封环13，在没有挂胶的外表面涂敷密封胶，在防尘唇和密封唇之间的空腔内填充多用途润滑脂。Coat the unrubberized outer surface of radial seal ring 13 with sealant,and fill multi-purpose grease into the cavity between dust-proof lip and sealing lip.圆锥滚子轴承9和12的启动力矩：2-6Nm。Starting torque of taper roller bearing 9 and 12 is 2-6Nm.螺栓17的拧紧力矩为195-210Nm。Tightening torque of bolt 17 is 195-210Nm.小齿轮壳的密封表面涂敷密封胶。Coat the sealing surface of pinion housing with sealant.北奔重卡海外车辆服务培训手册 Beiben heavy-duty truck service training manual for oversea market 8-18 8.7 主减速器油封的更换主减速器油封的更换主减速器油封的更换主减速器油封的更换 REPLACEMENT OF OIL SEAL OF MAIN RETARDER 更换油封：Replacement of oil seal:1 将夹持扳手20固定在连接法兰上。Fix the grip wrench 20 onto the connecting flange.2 松开锁紧装置并拧入十二方螺母。Loosen the locking device and screw on bi-hexagon nut.3 用三个六角螺栓将拉器固定在连接法兰上，并将连接法兰拉出来。Fix the puller onto the connecting flange by using of 3 hex bolts and pull out the flange.4 拆下组合式油封13。Remove the combined oil seal 13.5 在新的径向油封的没有挂胶外表面涂敷密封膏。Coat the unrubberized outer surface of new radial oil seal with sealant.6 装入新的组合式径向油封，在防尘唇和密封唇之间的空腔内及油封唇口处填充多用途润滑脂。Install new combined radial oil seal,and fill multi-purpose grease into the cavity between dust-proof lip and sealing lip and the lip position of oil seal.7 在主动锥齿轮的花键上涂齿轮油后将连接法兰18套上。Coat the spline of driving bevel gear with gear oil,and then put connecting flange 18 on it.8 使用夹持扳手、套筒和变比扳手，将新的带肩螺母拧紧至800-900Nm。Use grip wrench,box spanner and reducing socket wrench to tighten the new nut to 800-900Nm.9 锁紧新的十二方螺母，敲击十二方螺母上的锁紧圈，使其卡在轴的锁紧槽中