Question

(50) 7. Analyze the following operation. A 385C Excavator will be used to load material into a CAT 740 (no ejector) articulated truck. The excavator is equipped with a 6 cy heaped bucket and is capable of cycling every 30 seconds. The material being loaded weighs 3,300 lbs cy. The job efficiency is 90%. The trucks will be hauling the nmaterial 4000 feet over a road with a total rolling resistance of 9% to the dumpsite and 10% total rolling resistance on return. Once at the dumpsite, the trucks will take 45 seconds to maneuver and spread their load. The excavator costs $200/hr to operate. Each truck costs $120/hr to operate. Support equipment consisting of a blade and two water trucks costs $250/hr. Determine the ideal number of trucks for the operation and the total cost per hour based on the number of trucks needed and the total cost per cubic yard for the operation fications Articulated Trucks 740 Ejector 740 450 hp 319 A424 hP 31 391 kg 33 100 g7.336 610 kg (78,507 64 081 kp 141,297 D 72 600 kg 160,055 ib 7 610 kg 162.282 Ib 55.0% 21.3% 29,1% weght (Emp Disthibuition Empy 32.6% 38 t 42 T m23.3 yd 3.5T 39.5t 24.2 yd 17.8 m 23.1 m 14.5 m 19.0 yd1 19.7m 25.8 Max Capacity" Struck (SAE) 18.5 m 230.2 yd 31.4 yd' ACERT C15 Heaped (2:1) (SAE) Engine Model No Cylinders ACERT C15 ACERT CI5 137 mm 137 mm 15.2L 17.2 m 171.5 mm 6.75 6.75 171.5 mm 6.75 925 in 15.2 L 926 in2 926 in 15.2L 29.5R25 Radials 29.5R25 Radials 18.2 m Tres Front, Center Rear Gioular Clearance Diameter Fuel Tank Reil Capacity General Dimensions (Empty): 26.5R25 Radials 10 56%" 55'5 59 6* 532L 140.5 U.S. gal 32L 140.5 U.S. gal 532L140.5 U.S. ga Height to Cab Top 1213.75 m 172 3.7 m 5.23 m 0.89 m 2.98 m 6.81 m 6.09 m 123 172 357 3.75 m 123 5.58 m 11.59 m 3.07 m Wheel Base (Front-Center ot Bogie) Overal Lengh Loading Height (Empty) Height Dump 5.23 m 10.89 m 3.2 m 7.1 m 63 m 3.82 m 2.69 m 18'3 g10 224° 101 Body Length 23'4 20'6 12'6 8'8* Width (Operating 6.73 m 3.82 m 2.69 m 221 126 8'8* 3.82m 269 m 12'6" Front Tire Tread Ruting dnpendunt on optional equpment Masximum gross weight (empty weight plus payload) should not be exceeded. Excavators T Specifications 365C L 385C L 385C Belgium MODEL O 348 kg 154-328 185 502 b66 549 kg 190,840 ib 2.69-.1 yd 2064.66 m2-6.1 yd ,117 04 128k 2.02-49 y' 2.06-4.66 Bucket Capacity Range heaped Rated Engine RPM 1104 ins183mm 5,71 2 137 mm 18.1L Hydraule Pump Output at Rated RAPM 2×10512×490 2×400 Umin 2x 400 x 129 Relef Vaive Settings 32 000 kPa4840 pai 32 000 kPa 4640 psi 35 000 kPa 5080 psi 35000 kPa 5080 psi 28 060 kPa 4070 psi 26000 kPa 3770 pai 32 000 kPa 5080 psl2600o kP 590 psl 35 000 kPa 5000 ps 26 000 kPa 3770 psi Pilct Circuits Maximum Drawbar Pull Maximum Travel 4100 kPa 600 pai 4100 kPa 462 kN 133,200 It Two Speed Travel Two Speed Travel Two Speed Travel Lo: 2.5 km 1.6 mph Hi: 3.9 kmh 2.4 mph Lo: 2.8 kmh 1.7 mphL Hi: 4.5 km/h 2.8 mph Hi: 4 Lo: 2.8 km 1.7 mph 4.5 km/h 2.8 mph Track Shoe Width Overall Track Length 750 mm 586 m 7.06 m 2.75 m 26* 192" 650 mm 5.84 m 6.54 m2 2.75 m 3.51 m 1240 L 750 mm 2'6 20'10 10,137 i 7.22 m1119 in 6.54 Grouns Contsact Avea 10,943in 11,191 in Track Gauge 2.75 m 3.51 m 1240し 9'0* Extended 10'8- 11'6" 328 US gal 1'6 Fuel Tank Rleid Capacity 800 L 211US gal | 670 L 177 US. 310 L 328 uso 263 U.S. g 214 U.S. Openating weignt tor 385C and 385C L includes coolant, lubricants, full fuel tank, reach boom, medium stick conliguration, bucket and operator 75 kg (165 Ib) and 15 Hydraulic System (includes tank) Operating weight for 365C L includes coolant, lubricants, full fuel tank, one piece boom, long stick, small profile bucket, operator 75 kg (165 lb) and wide shoos. 3300 Ib) for atachments gal 995 L 263 U.S.gal 810L 214 Us. gal 810 L NOTE: Certain models may not be available in all Sales aroas. Specifications may also vary by Sales area. Contact your Caterpilar Dealer for detais.

Answer 1

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