LiftMaster HS670 HS670 GL BOARD Manual - Page 29

TROUBLESHOOTING HYDRAULIC DON'TS 1. DO NOT use only one wrench to lighten hose swivel fittings. Use two wrenches, one to tighten and one to hold back opposite fitting. See illustration above. 2. DO NOT pour detergent oil, mineral spirits, diesel fuel, fuel oil or gasoline into the tank. NEVER USE BRAKE FLUID. Only use hydraulic oil. 3. DO NOT put pipe dope or teflon tape on any part of hose fittings. 4. DO NOT remove vent cap except to fill tank with fluid. 5. DO NOT attach hoses to fittings that have dirt on them. Clean hoses, fittings and fitting seats carefully. HOSES REMOVAL NOTE: Wear adequate eye protection when performing this step. To minimize loss of fluid when removing hoses, remove power, position bypass valve to manual operation, and press and hold directional valve manual override for about 30 seconds. You will need to insert a small tool into hole and push, to activate manual override. HYDRAULIC PUMP DIRECTIONAL VALVE CONNECTORS (2) One for open direction and one for closed direction. IMPORTANT: In directional valve solenoid (DV-1) the two brown wires attach to terminals #1 and #2 in the connector. In directional valve solenoid (DV-2) the two purple wires attach to terminals #1 and #2 in the connector. Directional Valve Wiring Assembly Directional Valve Manual Override R.H. CLOSE Direction Must Be Clean, No Pipe Dope One Wrench To Hold This Fitting One Wrench To Tighten This Fitting Manual Override R.H. OPEN Direction Vent Cap (add fluid here) Relief Valve Built-In Bypass Valve Handle Directional Valve Override (DV-2) Directional Valve Override (DV-1) 29 Port "A" Port "B" From Drive Motor