9 Maintenance and Inspection9.3 Grease Replenishment/Exchange Procedures9-12HW1483028HW14830289.3.4 Grease Replenishment/Exchange for U-axis Speed ReducerFig. 9-6: U-Arm PostureFig. 9-7: U-axis Speed Reducer Diagram9.3.4.1 Grease ReplenishmentReplenish the grease according to the following procedure. (Refer tofig. 9-7 “U-axis Speed Reducer Diagram” .)1. Make the U-arm horizontal to the ground.2. Remove the hexagon socket head plug PT3/8 from the greaseexhaust port.3. Remove the hexagon socket head plug PT1/8 from the grease inlet.4. Install the grease zerk PT1/8 to the grease inlet. (The grease zerk isdelivered with the manipulator.)5. Inject grease through the grease inlet using a grease gun.– Grease type: Molywhite RE No.00– Amount of grease: 390 cc(780 cc for 1st supply)– Air supply pressure of grease pump: 0.3 MPa or less– Grease injection rate: 8 g/s or less6. Move the U-axis for a few minutes to discharge the excess grease.U-armU-axis speed reducerGrease inletHexagon socket headplug PT1/8Grease exhaust portHexagon socket headplug PT3/8NOTE• If grease is injected with the bolt on, the grease will leakinside the motor and may cause a damage. Make sure toremove the bolt before the grease injection.• Do not install a joint, a hose, etc. to a grease exhaust port.Failure to observe this instruction may result in damage tothe motor due to coming off of an oil seal.49/69