MAINTENANCE Q. ATTACHMENT LUBRICATION Lubricate attachment pins according to the inter- vals indicated in page 4-9. Use extreme pressure multi-purpose grease No.2 EP Type. Lubricate all points until grease purges. The lubrication inter- vals are based on a standard excavator, see Sec- tion 6 of this manual for Kobelco definition of a stan- dard excavator, working in an average duty cycle . Average duty cycle is defined as “Most typical dig- ging application, road construction in natural bed clay, digging 50 ~ 60 % of the daily work sched- ule”. New pins and bushings, including new machines and repairs require special break-in procedures.
While both pin and bushing have a special ground finish, they still have to be mated to each other to eliminate the machining high points, see Fig. 4.22A. ing galling, unless the standard lubrication proce- dure is modified. Fig. 4.22B illustrates the pin load Hand lube fill FIG. 4.22B Power lube fill Pin 4 Bushing Load area Bushing and grease cavity discussed above. No matter how much grease is pumped into the pin bushing cavity with a hand grease gun, the grease will tend to escape to the outside before filling the grease cav- ity.
Therefore, to avoid this situation, the front at- tachment has to be repositioned during the lubri- cation process, to move the load area and allow the grease to cover the entire grease cavity be- tween the pin and bushing. Pin Rough surface requir- ing break-in. FIG. 4.22A Because of these high spots, it is recommended that the front attachment or the repaired area be lubricated a minimum of once every eight (8) hours for the first one hundred (100) hours for a standard machine working in an average duty cycle. All other machines should be lubricated every 4 hours for the first twenty (20) hours and every eight (8) hours for the next eighty (80) hours of operation.
This lu- brication procedure will reduce the possibility of a premature pin or bushing failure during the break- in process. RECOMMENDED GUIDELINES FOR REDUCED LUBRICATION INTERVALS: a. When the excavator does not meet the Kobelco standard definition, see Section 6 for standard specifications. b. When the application duty cycle exceeds the above guideline. c. When the machine is equipped with a special attachment; any attachment other than the stan- dard bucket, such as a large bucket, long arm, grapple, hammer, mower, shear, thumb, etc. d. Machines working with abrasive materials, chemicals mining, forestry, scrap, severe dig- ging (rock, hardpan), and digging in wet condi- tions. e.
Any other special attachment or application. Any of the above circumstances will require short- ening the standard lubrication interval. The machine configuration and application determine the spe- cial interval. SPECIAL CONSIDERATIONS FOR HAND LU- BRICATION: While grease grooves in the bush- ings allow grease to move around the bushing, it does not insure that grease gets on all of the bush- ing surfaces. Any load on the joint will prevent the grease from getting to the wear surface in the loaded area.
Due to the fact that a hand greaser does not provide the volume of grease that a power system does, there is a greater possibility of bush- 4-22 SK210(LC)/SK250(LC)–VI Dynamic Acera OM, 09/00 Rev.2