Safety and operating instructions - Crowder Hydraulic Tools

Safety and operating instructionswww.CrowderSupply.com • Toll Free: 888-883-5144ALF 71, ALF 71-1, ALF 67/80, BMT 51Crowder Supply Co., Inc. • 8495 Roslyn St., Commerce City, CO 80022 • Toll Free: 888-883-5144 • www.CrowderSupply.comOPERATINGINSTRUCTIONSDesign and functionAtlas Copco pusher legs of type BMT 51, ALF71, ALF 71-1 and ALF 67/80 are used with lightrock drills of type BBC. The feeds are doubleactingwith an automatic return. BMT 51, ALF71 and ALF 71-1 are equipped with a one-stagealuminium cylinder. ALF 67/80 is equipped with atwo-stage aluminium cylinder. The pusher legs areconnected to the rock drill by a bayonet coupling.Recommended air pressure is 6 bar.The pusher leg support is for helping the operatorto lift and feed the rock drill during drillingoperations. Pusher leg control is placed on theback head of the rock drill.Signs and decals on themachineSigns and decals that are important for your safetyand the care of the machine are included with eachmachine. New decals can be ordered using thespare parts list.The sign shows important information:The warning symbol together with the booksymbol means that you must read the Safety andoperating instructions before using the machine.Working principle of a pusherlegFunctionThe feeding movement of the pusher leg ispowered by compressed air, which is directedto the upper side of the piston and pushes thepiston out of the cylinder. For automatic return ofthe piston rod into the cylinder, compressed air isdirected to the lower side of the piston.Preparations before starting1. Check the drilling equipmentCheck that all of the drilling equipment is in goodworking order.Make sure that the air inlet port is free fromobstruction.Ensure that the fittings are tight and leak-proof.WarningAlways check for damaged or loose hoses andfittings before operation. Whipping hoses cancause serious injury.2. Blow through the air hoseEvery day, before using the drill, blow throughthe air hose to clear it of accumulated dirt andmoisture.3. Fill the lubricator with oilNote! Check that the chuck and drill-steel shankare always covered with a film of oil.Note! Always use a recommended lubricant.LubricantAir tool oilRecommendationUse a mineral-based air tool oilAmbienttemperature ºCViscosity grade(ISO 3448)-30 to 0 ISO VG 32-68-10 to +20 ISO VG 68-100+10 to +50 ISO VG 100-15010© 2006 Atlas Copco Construction Tools AB | No. 9800 0681 71 | 2006-11-20