User manual CATERPILLAR 844H BROCHURE

[. . . ] 844H Wheel Dozer ® Engine Engine Model Gross Power Net Power Operating Specifications Blade Capacities Weights Operating Weight Cat® C27 ACERTTM 512 kW 687 hp 468 kW 627 hp 15. 9-30. 7 m3 70 815 kg 20. 7-40. 2 yd3 156, 120 lb 844H Wheel Dozer A strong power train combined with a heavy-duty front frame provides long life and economical operation. Power Train Cooling System Structures The 844H features a box-section rear frame and four-plate front frame providing strength and stability. Together they provide resistance to dozing shocks and stresses while absorbing shock loads and twisting forces. 7 The Cat® C27 ACERTTM engine is U. S. The Next Generation Modular Radiator EPA Tier 3/EU Stage IIIa compliant and with Air-to-Air Aftercooling System combined with MEUI, ADEMTM IV, has been added to the 844H to help axle-shaft brakes and impeller clutch meet emissions requirements and torque converter with lock-up clutch improve efficiency, serviceability provides smooth consistent shifting and sound levels. [. . . ] Helps square up the frame and provides more clearance for hydraulic lines. Double tapered roller bearings and hardened pins resist both horizontal and vertical loads to increase life. The spread hitch also makes service access easier. Are designed to use mushroom and cup-shaped ISO mounts, reducing component vibration and sound levels. The engine mounts directly to the rear cross member, simplifying and improving load transfer structure. 7 Hydraulics Well-balanced hydraulics deliver precise, low-effort control and trouble-free operation. 3 Load Sensing Steering with STICTM Control System. Is a revolutionary system that integrates steering and transmission into a single controller. The variable displacement pump maximizes machine performance by directing power through the steering system only when needed. More efficient use of power results in decreased fuel consumption and higher production. · Simple side-to-side motions of the stick turn the machine right or left offering a 35 degree steering angle in both directions. Center-point frame articulation allows the front and rear wheels to track. Transmission shifting forward, neutral or reverse is controlled by the operator's fingers and gear selection is controlled by the operator's thumb. · XTTM-3 and XTTM-5 Hose. O-ring face seals and large-bore lift and tilt cylinders top off the hydraulic system, delivering the performance and durability owners expect. Reliable components reduce leaks and help protect the environment. Is used for engine, transmission and hydraulic cooling. A variable displacement pump drives the fan's hydraulic motor so that fan speed varies with coolant temperature. The fan draws only the power needed for cooling, reducing fuel consumption and increasing efficiency. 1 Two Separate Hydraulic Systems. Hydraulically operates blade raise, lower, tilt and tip. Features four positions: raise, hold, lower and float with detente hold on float. Offers operator selected single or dual-tilt and fingertip control for easy operation. Semi-U Blade. Combines the characteristics of the S and U blades into one package. Provides increased capacity with the addition of short wings which include only the dozer end bits without sacrificing spreading characteristics of straight blades. · 9 Operator Station Comfort and control -- a top quality operator station helps maximize productivity. 5 1 6 2 4 3 10 Cab Design. Is spacious and incorporates innovations for operator comfort and productivity, including an excellent viewing area, interior sound levels below 75 dB(A), Cat Comfort Series seat, standard coat hook, cup holder, storage bin, sun visor, trainer's seat with lapbelt and intermittent wet-arm wipers. [. . . ] Your Cat dealer can help you evaluate the cost involved so you can make the right choice. 13 Engine Engine Model Gross Power Net Power Net Power ­ Caterpillar Net Power ­ EEC 80/1269 Net Power ­ ISO 9249 Net Power ­ SAE J1349 (JAN90) Net Power ­ DIN 70020 Bore Stroke Displacement Cylinders Torque Rise Cat C27 ACERTTM 512 kW 687 hp 468 kW 627 hp 468 kW 627 hp 468 kW 627 hp 468 kW 627 hp 463 kW 621 hp 650 PS 137 mm 5. 4 in 152 mm 6 in 27. 1 L 1, 666 in3 12 31% Weights Operating Weight 70 815 kg 156, 120 lb Transmission Converter Drive ­ Forward 1 Converter Drive ­ Forward 2 Converter Drive ­ Forward 3 Converter Drive ­ Reverse 1 Converter Drive ­ Reverse 2 Converter Drive ­ Reverse 3 Direct Drive ­ Forward 1 Direct Drive ­ Forward 2 Direct Drive ­ Forward 3 Direct Drive ­ Reverse 1 Direct Drive ­ Reverse 2 Direct Drive ­ Reverse 3 Number of Forward Speeds Number of Reverse Speeds · With 45/65 R39 XLD D1 (L4) tires. · Converter drive two percent rolling resistance. 7 km/h 12. 2 km/h 21 km/h 7. 7 km/h 13. 4 km/h 23 km/h 7. 2 km/h 12. 8 km/h 22. 5 km/h 7. 9 km/h 14. 1 km/h 24. 8 km/h 3 3 4. 4 mph 7. 6 mph 13 mph 4. 8 mph 8. 4 mph 14. 3 mph 4. 5 mph 7. 9 mph 14 mph 4. 9 mph 8. 8 mph 15. 4 mph · These engine ratings apply at 2, 000 rpm when tested under the specific standard conditions for the specified standard. · Power rating conditions are based on standard air conditions of 25° C (77° F) and 99 kPa (29. 32 in Hg) dry barometer using 35° API gravity fuel having an LHV of 42 780 kJ/kg (18, 390 Btu/lb) when used at 30° C (86° F) [ref. 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