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821BThe charts below are guides tosizing buckets based on materialdensity, and are based on averageworking conditions. Additionalfactors, such as tires, counterweight,terrain, weather and options must beconsidered in bucket selection.Bucket SelectionTo determine optimum bucket size:1. Determine density of material being handled using the Material DensityChart below.2. Locate density in the column (U.S. or Metric) next to the 821B BucketSelection Illustration.3. Follow density along its horizontal line to find which bucket(s) can be usedfor that material density.U.S. StandardDensity ofMaterial821B Bucket Selectionand Material DensityMetricDensity ofMaterialkg/m 3lb/yd 3 Maximum density with standard 5,400 lbNOTE: 3 yd 3bucket is 4 IN 1 ®multipurpose.counterweightExtended Reach (XR) with standard5,400 lb counterweight3 yd 3(2.29 m 3 ) 3.5 yd 3(2.68 m 3 )Maximum density with optional 4,400 lbcounterweight in lieu of 5,400 lbcounterweightMaterialDensity (Loose)Caliche ............................ 2,100 lb/yd 3 (1250 kg/m 3 )ClayNatural bed .................. 2,800 lb/yd 3 (1600 kg/m 3 )Dry ............................... 2,500 lb/yd 3 (1480 kg/m 3 )Wet .............................. 2,800 lb/yd 3 (1660 kg/m 3 )With gravel, dry ............ 2,400 lb/yd 3 (1420 kg/m 3 )With gravel, wet............ 2,600 lb/yd 3 (1540 kg/m 3 )CoalAnthracite, broken ........ 1,850 lb/yd 3 (1100 kg/m 3 )Bituminous, broken......... 1,400 lb/yd 3 (830 kg/m 3 )EarthDry, packed .................. 2,550 lb/yd 3 (1510 kg/m 3 )Wet, excavated............. 2,700 lb/yd 3 (1600 kg/m 3 )Loam............................ 2,100 lb/yd 3 (1250 kg/m 3 )Granite, brokenor large crushed ........... 2,800 lb/yd 3 (1660 kg/m 3 )*Actual material density will vary from these typical values.204 yd 3(3.06 m 3 )Material Density Chart *MaterialDensity (Loose)GravelDry ............................... 2,550 lb/yd 3 (1510 kg/m 3 )Pit run (graveled sand) .. 3,250 lb/yd 3 (1930 kg/m 3 )Dry 1/2” to 2”(13 to 51 mm)............ 2,850 lb/yd 3 (1690 kg/m 3 )Wet 1/2” to 2”(13 to 51 mm)............ 3,400 lb/yd 3 (2020 kg/m 3 )Limestone, brokenor crushed.................... 2,600 lb/yd 3 (1540 kg/m 3 )SandDry ............................... 2,400 lb/yd 3 (1420 kg/m 3 )Wet .............................. 3,100 lb/yd 3 (1840 kg/m 3 )With gravel, dry ............ 2,900 lb/yd 3 (1720 kg/m 3 )With gravel, wet............ 3,400 lb/yd 3 (2020 kg/m 3 )Sandstone, broken .......... 2,550 lb/yd 3 (1510 kg/m 3 )Shale ............................... 2,100 lb/yd 3 (1250 kg/m 3 )Slag, broken .................... 2,950 lb/yd 3 (1750 kg/m 3 )Stone, crushed ................ 2,700 lb/yd 3 (1600 kg/m 3 )Topsoil ............................... 1,600 lb/yd 3 (950 kg/m 3 )