1、Best Practices Entry: Best Practice Info:a71 Committee Approval Date: 2000-04-20a71 Center Point of Contact: KSCa71 Submitted by: Wil HarkinsSubject: Common Charge Points for Lubrication Systems for Mechanical Ground Support Equipment Practice: Use junction boxes and hardlines to provide common char
2、ge points for grease lubrication of mechanical systems.Programs that Certify Usage: This practice has been used on Space Transportation System (STS), Facilities and Ground Support Equipment such as the Vehicle Assembly Building (VAB) 325 Ton Bridge Cranes.Center to Contact for Information: KSCImplem
3、entation Method: This Lesson Learned is based on Maintainability Technique number DFE-3 from NASA Technical Memorandum 4628, Recommended Techniques for Effective Maintainability.Benefit:This practice reduces the amount of time spent during maintenance by reducing the number of locations to access fo
4、r grease lubrication. This practice will also eliminate the need to access difficult to reach locations and make maintenance safer by eliminating the need to access hazardous locations.Implementation Method:Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
5、Required maintenance time is reduced by use of junction boxes and hardlines to lubricate bearing surfaces on mechanical equipment. This practice is most beneficial on large mechanical systems such as bridge cranes. Overhead bridge cranes require periodic lubrication of pivot bearings, wheel bea
6、rings, shafts, and other bearing surfaces. This servicing requires the maintenance technician to access a large number of locations on the equipment. The junction boxes are used to create locations from which many bearing surfaces can be lubricated at the same time. This reduces the number of locati
7、ons that maintenance personnel must access.The junction boxes are machined metal blocks with internal passageways for the grease or oil. There are two banks of hardline connection points along the bottom of the block. The blocks are available in various sizes allowing 2-12 hardlines to be connected.
8、 Each hardline that connects to the junction box is coupled to an internal chamber with a double acting piston. A pin indicator on top of each piston controls the volume (.012 - .072 cu. in.) of lubricant delivered and provides positive indication of discharge to each bank.There is a lever at one en
9、d of the block which directs the flow of grease from the grease fitting to one of the two banks of hardlines. With the lever in the vertical position, the maintenance technician applies grease through a grease fitting (Figure A). This directs lubricant to the top of the double acting piston in each
10、chamber driving them downward thereby forcing lubricant under each piston to be discharged into the bank one hardlines. This continues until all of the pin indicators are fully retracted. This indicates that the proper volume of lubricant has been applied to each hardline in bank one and bank two an
11、d is ready for discharge.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-refer to D descriptionD Figure A Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-refer to D descriptionD Figure BA. Rotary Valv
12、e HandleB. Rotary ValveC. Measuring PistonsD. Bank 2 Discharge LinesE. Indicator StemsF. Bank 1 Discharge LinesG. Volume Discharge Adjustment ScrewsThe technician then rotates the lever and again applies grease through the grease fitting (Figure B). This applies lubricant under the piston in each ch
13、amber driving them upward. Lubricant is forced Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-into each bank two hardline and the chamber is replenished to service bank one. When all the pin indicators are fully extended, the proper volume of grease
14、 has been applied to each hardline in bank two. The lever is then returned to the original position, ready for the next lubrication cycle.The primary benefit of this practice is minimizing maintenance time (20 - 40%) by consolidating a large number of locations requiring maintenance action into only
15、 a few. This practice further reduces maintenance time by placing the lubrication junction boxes on easy to access locations such as personnel walkways.Placing the lubrication junction boxes on personnel walkways will also reduce safety hazards during maintenance. Some locations requiring lubricatio
16、n may not only be difficult to access but may be hazardous, requiring special safety equipment such as safety harnesses and temporary work platforms. Special access requirements can be reduced or eliminated by the implementation of the practice.Impact of Non-Practice: Maintenance effort and system d
17、owntime will be reduced by the implementation of common charge points for lubrication systems on mechnical ground support equipment.Related Practices: N/AAdditional Info: Approval Info: a71 Approval Date: 2000-04-20a71 Approval Name: Eric Raynora71 Approval Organization: QSa71 Approval Phone Number: 202-358-4738Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
