A contractor is using a D8T Crawler Tractor for land clearing application (medium fuel consumption). Minimal ripping will be required to loosen material. It will be operating on completely penetrable surfaces with few bumps, slightly or intermittently damp soils containing a low proportion of hard, angular or sharp particles with the following information. Initial Cost with the delivery cost: $105,000 Expected life: 8 years Expected usage (hours/year): 900 hrs. Salvage value: $35,000 Interest rate is 5% Insurance is 1% Taxes are 2% Fuel cost is $2.4/gal Lube oils, fillers and grease service is expected every 100 hours and cost $370/service Z factor=0.7 (between moderate and high) The repair cost is $8.50/hour Special wear items: Set of teeth for $1,000 which will have to be replaced every 520 hrs Operator's hourly wage is $65/hour Please estimate the hourly undercarriage cost based on the following tables. Undercarriage Basic Factors Model Basic Factor 5230B 28.2 D11T 26.1 5130B 20.4 D10T2 16.2 5110B 13.6 D9T 10.9 D8T 9.6 973D, 587T, 589, D7R LGP, D7E LGP 11.2 9.1 D7R, 963D, 583T, D6T LGP, D7R XR, D7E 385C, 5090B 7.2 D6T, 953D, 572R, 527 7.0 365C 6.8 345D 5.9 D6N XL, 517 5.6 336D 5.0 4.1 D3K (All), D4K (All), D5K (AII), 939C, PL61 329D 3.9 314D, 315D, 319D, 323D 3.4 320D 2.9 307D, 308D, 311D, 312D 2.4 Conditions Multipliers Impact Abrasiveness "Z" 0.3 1.0 1.0 High Moderate 0.2 0.5 0.5 Low 0.1 0.1 0.2 Three primary conditions affect probable life-expectancy of track-type undercarriage: 1. Impact. The most measurable effect of impact is structural - that is bending, chipping, cracking, spalling, roll-over, etc., and problems with hardware and pin and bushing retention. Impact ratings: High Non-penetrable hard surfaces with 150 mm (6") or higher bumps. Moderate - Partially penetrable surfaces and bumps of 75-150 mm (3-6") height. Low - Completely penetrable surfaces (which provide full shoe plate support) with few bumps. 2. Abrasiveness. The tendency of the underfoot materials to grind away the wear surfaces of track components. Abrasiveness ratings: High - Saturated wet soils containing a high proportion of hard, angular or sharp sand or rock particles. Moderate - Slightly or intermittently damp soils containing a low proportion of hard, angular or sharp particles. Low Dry soils or rock containing a low proportion of hard, angular or sharp sand or rock chip particles. 10. a. Tires: Replacement Cost + Life in Hours (1) (2) Cost Life b. Undercarriage (Impact + Abrasiveness + Z Factor) x Basic Factor (1) (2) X (Total) (Factor) one: a. 12.48 b. 17.28 C. 33.93 d. 11.83 Select