• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
Figure  14-31.Components  of  a  generator.
Centrifugal  Pump

Equipment Operator Basic - Beginning construction equipment operators manual
Page Navigation
  385    386    387    388    389  390  391    392    393    394    395  
Uses To grease fittings, pull out the length of hose you need, wipe the fitting clean, and push the coupler of the control valve onto the fitting. Squeeze the valve lever. When  grease  is  forced  out,  release  the  lever  and  twist the coupler to one side to remove it. Do not try to pull it straight off. After servicing is complete, wipe the control valve coupler clean, rewind the hose, and put the control  valve  into  its  holder. NOTE: When  greasing,  follow  the  manufacturer’s lubrication chart to ensure all grease fittings are greased at the proper intervals. NOTE:   Be   careful   not   to   overgrease,   as overgreasing can cause damage to seals and packings. NOTE: Wipe up any excessive grease that can fall onto the deck of the equipment or onto components that do  not  require  greasing. In dispensing motor or gear oil,  pull out the necessary length of hose, clean all dirt off the fill hole plug and surrounding area, and then remove the plug. Check to see that the meter is on zero, insert the control valve nozzle into the fill hole, and squeeze the valve lever.  After  the  required  quantity  of  motor  or  gear  oil has been dispensed, release the lever. Reinstall the plug you removed earlier. Clean the control valve nozzle, reset the meter to zero, turn counterclockwise, and store the hose and valve. For gauging and inflating tires, an air gauge with two sizes of air chucks is in the storage cabinet. The gauge has a pin fitting that snaps into the air hose coupler. When inflating tires, release the gauge lever to check the pressure of the tire; depress to inflate the tire. Safety l Always have a firm metal-to-metal contact when filling the fuel tank. l Never stand directly in front of a tire when it is being inflated. Stand to one side. l Always pipe the exhaust fumes to the outside when operating the lubricator in an enclosed area. .  Never  fill  the  fuel  tank  while  the  engine  is running. . Never direct a jet of compressed air at yourself or  anyone  else. l  Always  stop  all  operations  of  a  unit  before servicing  it. l  Always  use  Navy-approved  solvents  for cleaning. l Always relieve all pressures before servicing any component  of  the  lubricator. .  Always  check  the  engine  and  the  compressor crankcase oil level at the start of each workday. . Always review the Material Safety Data Sheet (MSDS)  for  every  hazardous  material,  fuel,  lubricant, and solvent before use for precautions and hazards. . Always dispose of greases, oils, and contami- nated  materials  in  an  environmentally  responsible manner. PUMPS A pump uses the mechanical energy produced by its prime mover to move liquid from one point to another. The pump moves the liquid by either pushing, pulling, or throwing. Pumps are often named or classified by the action  that  causes  fluid  movement;  for  example, diaphragm  or  centrifugal. Regardless of its design or classification, each pump has a power end and a liquid end. The  power end is some  form  of  prime  mover,  such  as  an  electric  motor, internal  combustion  engine,  or  steam  turbine.  In steam-driven  pumps,  the  power  end  is  often  referred  to as the steam end. The basic purpose of the power end is  to  develop  the  mechanical  motion  or  force  required by the liquid end. In  the  liquid  end,  mechanical  motion,  developed  by the prime mover, is exerted on the liquid. This part of the pump must allow for suction (where the liquid enters the pump) and for discharge (where the liquid leaves the pump). The liquid end is often referred to as the pump end, the water end, or the oil end to show the nature of the  substance  pumped. Diaphragm Pump The diaphragm pump (fig. 14-33) uses a flexible diaphragm   to   move   liquid.   The   prime   mover   is usually  a  small  gasoline  engine  with  an  eccentric connecting  rod  arrangement  that  converts  rotary motion to reciprocating motion. On the suction stroke, the  diaphragm  is  drawn  upward  into  a  concave configuration.  This  movement  of  the  diaphragm  results in a partial vacuum that causes the suction ball valve to 14-28







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.