Hydraulic systems equipment range

Hydraulic-Lift Trucks. Flydrauhc-Uft trucks (Fig. 4.41) are used for short distance moves at the workplace. They generally range in capacity from 2500 to 8000 lb (1130 to 3625 kg). These trucks require a minimum amount of maintenance, and can last for 20 years. The trucks can be equipped with a jacklike manually operated hydraulic lift or pedal operated system to elevate a loaded pallet. Some units use an electrically driven hydraulic system to lift, often above the maximum 5 in of the manual system. These lift trucks generally use forks for lifting pallets or platforms for special containers and positioning heavy loads. 

Exposures range from abraded insulation e5q)osing the conductor to open electrical cabinets. An electrically derived hazard is the exposure of people and equipment to desfructive energy related to the electrical system. Electrically powered mechanical and hydraulic systems, laser systems, radio frequency generators, and computer controls fall into this category. Exposures range from mechanical pump couplings to laser beams to live steam to conveyor systems. 

After a detailed look at the range of filtration equipment, the Handbook now turns to the major applications for the equipment, concentrating on the service or utility applications, but including water filtration, which overlaps the boundary between utility and process uses. This and the following section together examine the main liquid filtration applications, with engine fluids and hydraulic systems covered in Section 5, and all other liquid clarification processes covered in this section. 

Selection and care of the hydraulic fluid for a machine will have an important effect on how it performs and on the life of the hydraulic components. During the design of equipment that requires fluid power, many factors are considered in selecting the type of system to be used-hydraulic, pneumatic, or a combination of the two. Some of the factors required are speed and accuracy of operation, surrounding atmospheric conditions, economic conditions, availability of replacement fluid, required pressure level, operating temperature range, contamination possibilities, cost of transmission lines, limitations of the equipment, lubricity, safety to the operators, and expected service life of the equipment. 

In order to limit the uphill and downhill sliding movements of the tyres on the rollers, small kilns are provided with thrust rollers which are given a certain permanent setting to limit the range of movement. Large kilns are equipped with a more sophisticated system comprising hydraulically controlled thrust rollers (Figs. 5, 6 and 7). 

---