1 Warning Caution: • Pb free solder has a higher melting point that standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please use a soldering iron with temperature control and adjust it to 750 ± 20°F (400 ± 10°C). In case of using high temperature solder- ing iron, please be careful not to heat too long.
3 Troubleshooting Guide (Refer to Wiring Connection Diagram)
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3.1. Trial Operation (after checking Troubleshooting Guide.) 3.1.1. ASSEMBLY 1. Confirm if there is NO gap between Housing A and B by pinching the lead wires. 2. Confirm all screws are tightened firmly. 3. There should be no metallic sound and abnormal sound. 4.
4 Disassembly and Assembly Instructions Ref. No. 1A Procedure 1A Removal of the Housing. 1. Remove 7 housing screws. 2. Remove 7 screws. 3. Remove ring plate and ring. 4. Remove click spring on both housing A and B. 5. Loosen a nut.
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Procedure 1A → 2A Ref. No. 2A Removal of Switch and Driving block. 1. Take out the switch assembly and the driving block. 2. Separate the motor from the gear box block by twisting the motor to unlock tabs. Procedure 1A → 2A → 2B Ref.
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Procedure 1A → 2A → 2B → 2C Ref. No. 2C Removal of Battery terminal block. 1. Take out the connector from the battery terminal block with a screw driver. Procedure 1A → 2A → 2B → 2C → 2D Ref.
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Procedure 1A → 2A → 2B → 2C → 2D → 2E Ref. No. 2E Removal or assembly of detection PCB. (Removal) 1. Take out the clutch handle. 2. Pull out the torque detection PCB from the gear box block. (Assembly) 1.
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Procedure 1A → 2A → 2B → 2C → 2D → 2E → 2F Disassembly of gear box block. Ref. No. 2F 1. The internal parts of gear box block can be disassembled in order. Procedure 1A → 2A → 2B → 2C → 2D → 2E → Ref.
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Procedure 1A → 2A → 2B → 2C → 2D → 2E → Ref. No. 2H Check point on wiring. 2F → 2G → 2H...
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Procedure 1A → 2A → 2B → 2C → 2D → 2E → Ref. No. 2I Check point on assembly. 2F → 2G → 2H → 2I...
7Exploded View and Replacement Parts List Model No. : EY7420 Exploded View...
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Model No. : EY7420 Parts List Ref. Safety Part No. Part Name & Description Q'ty Remarks WEY7420H3078 HOUSING AB SET WEY7420L1087 GEAR BOX BLOCK WEY7420L3747 MOTOR MOUNTING PLATE WEY6225L6026 SEMS SCREW 2 (M3*5) WEY7420L0637 CLUTCH HANDLE WEY7410H3237 H/L CHANGE HANDLE...