Gears maintenance

Ladder/lifting gear maintenance First aid attendants Housekeeping coordinators... 

For most items, the maintenance engineer should have little difficulty listing the work to be done when the item is inspected. Among the literature available, BS 6423 and BS 6626 give excellent advice on LV and switchgear and control gear maintenance. For the more complex apparatus the makers instructions should be obtained and followed. The aforementioned HSE and lEE guidance is also helpful. 

For the slower speed compressors, an evaluation must be made concerning the use of direct-connected motors that are more expensive, or the use of a less expensive 1,800 rpm or a 1,200 rpm motor with a speed-reducing gear. As before, the evaluation must include all factors, such as installation and the extra space, as well as some factor for additional maintenance. 

Maintenance embraces regular inspection, periodic examination by competent persons , and repairs. Accidents may arise as a result of the lack of maintenance, during maintenance, and as a consequence of faulty maintenance. Preventive maintenance can be a legal requirement for, e.g., pressure vessels/boilers, lifting gear, power presses. A system is required for monitoring compliance witli scheduled preventive maintenance programmes, backed up by in-service inspection. Breakdown... 

Large towers often have the motor mounted horizontally connected to a right angle gear drive. The motor can be closely coupled- in the air stream- or connected with a drive shaft with the motor outside the air stream. Maintenance personnel typically prefer the external TEFC motor- when available- for its easier access. Cooling tower fans- like all fans- operate in accordance with the fan laws one of which states that the horsepower required to drive a fan increases to the cube of fan speed. 

Use nonlubricated compressors. However, oil is still needed for bearings and gear boxes and may leak into the compressors unless special attention is paid to their design and maintenance [19]. 

High speed expensive. Harmonics generation needs consideration. More maintenance than induction motors Limited power range. Low efficiency at reduced speed. Only speed reduction possible. Requires at least 30% derating of motor Automatic control expensive. Movable brush gear... 

This chapter examines the need for lubrication and the types of lubricant available. Various applications are considered, including engines gears, hydraulic equipment, machine tools, metal cutting and working fluids, compressors, turbines and electrical oils. The care of lubricants on-site, application of planned lubrication and inclusion within overall maintenance management are examined. 

Incorrect lubrication can take many forms. One example is the use of oil that is too thick or too thin, or is incompatible with the metal of the gears. Others include unsuitable methods of application, bad filtration, inadequate maintenance, filling to the wrong level, and poor standards of storage and handling. 

Issue, control, testing and repair of lifting gear, ladders, scaffolding etc. Scheduled maintenance of key plan items Use of job cards/log book to identify tasks precisely Permit-to-work systems... 

The use of hydraulic units to drive rubber processing machinery has enabled the elimination of cumbersome gear boxes and their respective couplings. The hydraulic drive unit is fitted directly to the end of the shaft to be driven. It can be controlled fully across the entire speed range and provides full torque from rest, even under heavy load, up to the maximum rotational speed demanded. Shock loads do not affect performance and it has the ability to stop immediately on demand, due to its low inertia, unlike conventional drive systems. The unit requires little maintenance. 

Analysing the maintenance and repairs of vehicles shows that only a small part of the work will disappear, as there will be no more abrasion repairs on motors and motor electrics. Also, repairs on gears and the coupler will be reduced, as these parts will be simplified (see Fig. 13.15). On the other hand, it has not been estimated what kind of work the fuel-cell technology will bring in addition to the work done today. As the trend at present is towards more electronic components and control, fuel-cell... 

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