Equipment World Digital Magazine
Issue link: http://read.dmtmag.com/i/335762
designed to deliver from 2,000 to 15,000 psi. Applying too much pressure while greasing will damage the bearing seals, which rarely can handle more than 500 psi. Symptoms of high grease gun pressure include collapsed bearing shields, damaged bearing seals, grease driven into electric motor windings, and safety and environmental issues. Reloading: Re-greasing frequency: Matching re-greasing frequencies to optimal conditions is necessary to avoid long-term machine health problems. If the frequency interval is too long, symptoms may include lubricant starvation, which promotes wear, friction and grease contamination. If the frequency interval is too short, excessive grease consump- tion and safety and environmental issues may occur. OEM recom- mendations should be examined and coupled with historical data from your computerized mainte- nance management system. Firing for effect: Over- greasing and under-greasing: It is important to know the exact amount of grease necessary for your greasing application to avoid over-greasing or under-greasing. Symptoms of over- greasing include damaged seals and motor windings, en- vironmental issues, and fluid friction, which lead to in- creased heat genera- tion, higher grease oxidation rates and higher energy con- sumption. Symptoms of under- greasing include bearing starva- tion, which results in friction wear and increased contamination. To overcome this problem, it is necessary to calculate the amount of grease that is released from a grease gun per stroke. Refer to the calibration method mentioned earlier. July 2014 | EquipmentWorld.com 48 maintenance | continued GET A QUALITY PIECE OF EQUIPMENT, LIKE THE 600S, WITHOUT HAVING TO PURCHASE A NEW ONE. Through JLG ® Ground Support, we offer complete factory reconditioning services like off-the-lot stock reconditioned units and customer-owned fleet packages. Contact us for more information about our reconditioning program. www.jlg.com/en/600S-2 CERTIFIED RECONDITIONING FROM JLG LOOKS LIKE NEW, WORKS LIKE NEW REACHING OUT | 600S Telescopic Boom Lift Preston Ingalls is president/CEO of TBR Strategies, a Raleigh, North Carolina- based maintenance and reliability con- sulting firm, tbr-strategies.com. Mark Barnes is vice president of reli- ability services for Des-Case, which spe- cializes in fluid management and contami- nation control solutions, descase.com.