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13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 SERVICE INFORMATION GENERAL INSTRUCTIONS • During servicing, keep oil or grease off the brake drum and brake linings. • Drain the brake fluid from the hydraulic brake system before disassembly. • Contaminated brake disk or brake pads reduce stopping power. Clean the contaminated brake disk with high-performance brake degreaser and replace the brake pads. • Do not use brake fluid for cleaning.
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13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Inner Nut REAR WHEEL REMOVAL Place the machine on a level place. Use the nut wrench to loosen two nuts (inner and outer) of the rear axle. Special Nut wrench F010 Outer Nut Cotter Pin Remove the cotter pin. Nut Attaching The Wheel Hub Remove four nuts attaching the wheel panel of the both rear wheels. Loosen nut attaching the wheel hub of the both rear wheels. °ØElevate the rear wheels by placing a suitable stand under the rear of frame.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Inspection Measure the wheel runout. Service Limit: Vertical: 2.0 mm Lateral: 2.0mm Replace wheel or check bearing play if out of specification. Remove two nuts of the rear axle (outer and inner). Outer Nut Inner Nut Remove five bolts attaching left and right lower guard. Bolts Right Lower Guard Adjuster Loosen the lock nut for the adjuster of the drive chain slack.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Bolts Loosen four bolts attaching rear axle hub. Remove the drive chain from driven sprocket. Drive Chain Bolts Remove six bolts attaching brake drum cover. Remove brake drum cover and rubber spacer.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Inspection Inspect the inner surface of the brake drum is scratches, polish brake drum lightly and evenly with emery cloth. Measure the inside diameter of the brake drum. Service limit: 131mm Replace if it is out of specification. Brake Cable Disconnect the rear brake cable from the camshaft lever. Remove the brake shoes. INSPECTION Measure lining thickness of the brake shoes. Service limit: 2.0 mm Replace if it is out of specification.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE bolts Remove four bolts and the rear axle hub. INSPECTION Replace if the wheel hub is cracks or damage. Replace if splines of the wheel hub is wear or damage. MX’er 50 Wheel Hub Splines Replace if the rear axle is scratched (excessively) or damage. Replace if splines and threads of the rear axle is wear or damage. Measure the rear axle run out. Service limit: less than 1.5mm Replace if it is out of specification.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE DRIVE CHAIN INSPECTION Remove rear wheels, rear hub (with rear axle) and swing arm. Refer to the “REAR WHEEL°– REMOVAL” and “SWING ARM REMOVAL” section. Remove right foot board. Remove the drive sprocket. Remove the drive chain. Inspect the drive chain stiffness. Clean and lubricate or replace if stiff. Inspect the drive sprocket and the driven sprocket. Replace sprocket if more than 1/4 teeth wear or bent teeth.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Bearings Inspect rear axle hub. Replace if bearings allow play in the axle hub or the bearing turns roughly. Replace if oil seals is wear or damage. Replace if rear axle hub is cracks, bend or damage. Bearing and oil seal replacement steps: Clean the outside of the rear axle. Remove the oil seal by a flat-head screw driver. °Ø Place a wood block against the outer edge to protect this edge. Oil Seal Remove the bearing by a general bearing puller.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Bolts Install the brake drum. Install the rubber spacer and brake drum cover. Torque: 0.8_ 1.2kgf-m Adjust drive chain slack. Approximately: 30 mm Bolts Tighten the bolts. Torque: 6.0_ 8.0kgf-m Torque: 6.0_ 8.0kgf-m Adjuster Tighten the lock nut. Torque: 1.8_ 2.
. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Tighten the two nuts with the nut wrench. Special Nut wrench F010 Torque: 11.0_ 13.0kgf-m Install wheel hub, plate washer and nut (wheel hub). Torque: 6.0_ 8.0kgf-m Install cotter pins. °Ø Do not loosen the axle nut after torque tightening. If the axle nut groove id not aligned with the cotter pin hole, align groove with the hole by tightening ut on the axle nut. °Ø Always use a new cotter pin.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 SWING ARM Place the machine on a level place. Elevate the rear wheels by placing a suitable stand under the rear of frame. °ØSupport the machine securely so there is no danger of it falling over. Cotter Pin Remove the rear wheels, rear hub with rear axle. Refer to the “REAR WHEEL°– REMOVAL” section Remove the cotter pin, washer and shaft. °ØWhen removing the lower shaft, hold the swing arm so that it does not drop downwards when the shaft id removed.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Check the swing°@arm side play by moving it from side to side. If side play noticeable, check the inner collar, bearing, bushing and thrust cover, or adjust the shim. Check the swing arm vertical movement by moving it up and down. If vertical movement is tight, binding or rough, check the inner collar, bearing, bushing and thrust cover, or adjust the shim. Remove the nut and pivot shaft, then remove swing arm. Swing arm Remove the thrust covers.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 INSPECTION Inspect the shock absorber rod. Replace the shock absorber assembly if bends or damage. Inspect the shock absorber. Replace the shock absorber assembly if oil leaks Inspect the spring. Replace the shock absorber assembly if fatigue. Move the spring up and down. Inspect the swing arm. Replace if crack, bend or damage. Roll the axle on a flat surface to inspect the pivot shaft. Replace if bends.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE INSTALLATION Reverse the “REMOVAL” procedure. Apply grease onto the collar, bush, pivot shaft and thrust cover. Install the swing arm and tightening the nut. Torque: 6.0_ 8.0kgf-m MX’er 50 Pivot Shaft Install the shock absorber and tightening the bolt. Torque: 3.5_ 4.5kgf-m Install the shaft, washer and cotter pin. °Ø Always use a new cotter pin. Install the rear hub and rear wheels. Refer to the “REAR WHEEL INSTALLATION” section.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 HYDRAULIC BRAKE BRAKE FLUID CHANGE/AIR BLEED Screws Place the motorcycle on its main stand on level ground and set the handlebar upright. Remove the two screws attaching the brake fluid reservoir cap. ＊ Use shop towels to cover plastic parts and coated surfaces to avoid damage caused by splash of brake fluid. Connect a transparent hose to the brake caliper bleed valve and then loosen the bleed valve nut.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 Bleed Valve HYDRAULIC BRAKE BRAKE SYSTEM BLEEDING Connect a transparent hose to the bleed valve and fully apply the brake lever after continuously pull it several times. Then, loosen the bleed valve nut to bleed air from the brake system. Repeat these steps until the brake system is free of air. ＊ When bleeding air from the brake system, the brake fluid level should be kept over 1/2 of the brake reservoir height.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 BRAKE DISK Measure the brake disk thickness. Service Limit: 3.0mm Measure the brake disk run out. Service Limit: 0.3mm Fluid Tube Bolt BRAKE MASTER CYLINDER REMOVAL Drain the brake fluid from the hydraulic brake system. ＊ Do not splash brake fluid onto any rubber, plastic and coated parts. When working with brake fluid, use shop towels to cover these parts. Remove the two master cylinder holder bolts and remove the master cylinder.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 DISASSEMBLY Remove the piston rubber cover and snap ring from the brake master cylinder. Snap Ring Pliers Master Cylinder Remove the washer, main piston and spring from the brake master cylinder. Clean the inside of the master cylinder and brake reservoir with brake fluid. Spring Main Piston Snap Ring INSPECTION Measure the brake master cylinder I.D. Inspect the master cylinder for scratches or cracks. Service Limit: 12.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 ASSEMBLY Before assembly, apply brake fluid to all removed parts. Install the spring together with the 1st rubber cup. ＊ • During assembly, the master cylinder, main piston and spring must be installed as a unit without exchange. • When assembling the piston, soak the cups in brake fluid for a while. Install the main piston and snap ring. Install the rubber cover. Install the brake lever.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE MX’er 50 BRAKE CALIPER REMOVAL Remove the brake caliper, brake pads and pad spring. Place a clean container under the brake caliper and disconnect the brake fluid tube from the brake caliper. ＊ Be careful not to splash brake fluid on any coated surfaces. DISASSEMBLY Remove the brake caliper holder from the brake caliper. Brake Caliper Holder Remove the pistons from the brake caliper.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE INSPECTION Check the piston for scratches or wear. Measure the piston O.D. with a micrometer gauge. Service limit: 33.85mm replace if below Check the caliper cylinder for scratches or wear and measure the caliper cylinder I.D. Service limit: 34.05mm replace if over ASSEMBLY Clean all removed parts. Apply silicon grease to the pistons and oil seals. Lubricate the brake caliper cylinder inside wall with brake fluid.
13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE INSTALLATION Connect the brake fluid tube to the brake caliper, aligning the fluid tube with groove in the caliper and tighten the fluid tube bolt. Torque: 2.8_ 3.5kg-m MX’er 50 Aligning The Fluid Tube With Groove Add the recommended brake fluid into the brake reservoir and bleed air from the brake system. (Refer to 13-17.) Fluid Tube Bolt Washer Install the brake caliper onto rear axle hub and tighten the bolts. Torque: 2.4_ 3.
