BOOST PRODUCTION-DIG INTO TODAY'S BACKHOE-LOADERS

BACKHOES/LOADERS (B/1), BOTH PAST AND PRESENT (MAJOR EMPHASIS IS ON THE PRESENT), ARE COMPARED FOR DESIGN AND PERFORMANCE TRENDS. ON HEAVY-DUTY INDUSTRIAL FRONT AXLE B/1'S LOADS OF UP TO 70,000 LB STATIC AND 15,000 LB DYNAMIC CAN BE WITHSTOOD SINCE WHEN THE BACKHOE IS FULLY EXTENDED, THE BUCKET IS POSITIONED IN THE TRENCH, WHILE THE LOADER PROVIDES A COUNTERBALANCE. CONVERSELY, THE BACKHOE ACTS AS A COUNTERWEIGHT WHEN THE OPERATOR IS DIGGING OR CARRYING WITH THE LOADER ATTACHMENT. IN BOTH INSTANCES THE RESULTING FORCE STRESSES THE MIDDLE OF THE MACHINE. SIZE, WEIGHT, AND HORSEPOWER HAVE ALSO INCREASED FOR MANY MODELS. FOR INSTANCE, THE LARGEST B/1, THE HY-DYNAMIC 200-4 DYNAHOE, DIGS 20 FT, REACHES 28 FT, HAS A 2 1/2 CU YD LOADER BUCKET, COMES WITH A FOUR WHEEL DRIVE, HAS 155 GROSS HP, AND WEIGHS 32,000 LB. FURTHERMORE, HYDRAULIC SYSTEMS HAVE BEEN IMPROVED---IN THE DIG-RAISE-DUMP CYCLE. THE EXTENDIBLE BOOM EXPANDS THE RANGE OF JOBS THAT A B/1 CAN HANDLE. FOR EXAMPLE, IT IS POSSIBLE TO TUNNEL UNDER DRIVEWAYS, SIDEWALKS, PIPES, AND FOUNDATIONS. OTHER INNOVATIVE, SOMETIMES OPTIONAL, FEATURES THAT INCREASE PRODUCTION ARE: (1) A BOOM LOCKOUT WHICH PERMITS THE BACKHOE TO BE LOCKED INTO PLACE; (2) A SIDE-SHIFTING OPERATION THAT PERMITS THE BACKHOE OPERATOR TO REDUCE THE NUMBER OF MOVES WHEN DIGGING A WIDE TRENCH, ETC., (3) BUCKETS WITH ADJUSTABLE SIDE ANGLES FOR DIFFERENT SIZE TRENCHES; (4) RIPPERS OR CLAWS THAT CAN BE ADDED TO THE BUCKET FOR FROZEN GROUND, BREAKING ASPHALT PAVEMENTS, ETC.; (5) A MULTIPURPOSE JAW BUCKET; (6) A SIDEBOOM FOR SETTING PIPE; AND (7) AN AMETEK DEPTH GAUGE FOR MEASURING DEPTH.

• Publication Date: 1973-6

Media Info

• Features: Photos;
• Pagination: p. 75-9
• Serial:
  • Construction Equipment
  • Volume: 47
  • Issue Number: 7

Subject/Index Terms

• TRT Terms: Alternatives analysis; Design; Excavating equipment; Horsepower; Hydraulic equipment; Loaders; Size; Weight
• Old TRIS Terms: Booms; Buckets; Hydraulic systems; Option
• Subject Areas: Construction; Design; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 00215653
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 11 1973 12:00AM