Penentuan Umur Dump Truck Dengan Metode Optimal Replacement Interval Di Cv. X

Abstract

Every asset in the operation of certain services, transportation or services will experience a change in each period of time. Replacement is made on an asset that is damaged, operating costs are too high, or a change in technology makes an equipment unusable. CV. X is a company engaged in providing services for transportation fleets, one of which is dump trucks. Today, companies are often faced with complex replacement problems and only apply the depreciation method to determine the life of their equipment. This study aims to propose determining the age of dump trucks with optimal replacement intervals and to find out the hourly usage costs incurred by the company at the optimal replacement age. This method uses the hourly cost as the basis for determining the optimal replacement life. The research data is in the form of secondary company data consisting of maintenance data such as vehicle purchase price data, fuel consumption, lubricant consumption, labor wages, annual operating hours, productivity, rental rate, interest rate value, and income tax rate. The parameters are in 1000 hour intervals. The optimal replacement life for dump trucks is in the interval of 30,000 hours – 40,000 hours or 12-16 years. The hourly usage cost at the optimal replacement life interval with the productivity approach is $159.74 and the hourly usage cost with the rental rate approach is $104.64.

Analysis of the auto lube system electric grease pump against the unscheduled breakdown of the dump truck unit brand k type HD 1500-7

“…(No. 14) Grease Tank Figure 4 and Figure 5 grease circuit when the displacement pump, grease (8) works to pump grease from the grease shelter or grease reservoir(14) then the grease will come out to the grease injector (13) through the pressure switch(9) and check valve(10) ). There is grease going to the vent valve(11) to return to the grease tank (14) at the same time there is a supply of hydraulic oil from the office(12) to close the return path to the grease tank(14) so that the grease that is pumped only goes to the grease injector(13).…”

“…14) Grease Tank Figure 4 and Figure 5 grease circuit when the displacement pump, grease (8) works to pump grease from the grease shelter or grease reservoir(14) then the grease will come out to the grease injector (13) through the pressure switch(9) and check valve(10) ). There is grease going to the vent valve(11) to return to the grease tank (14) at the same time there is a supply of hydraulic oil from the office(12) to close the return path to the grease tank(14) so that the grease that is pumped only goes to the grease injector(13). The pumped grease pressure is 2500 psi, if the pressure has reached the standard pressure of 2500 psi during the working time of the grease pump, the pressure switch (9) will send a signal to the auto lube controller which will then cut off the flow to the solenoid valve so that the oil supply to the manifold includes the oil that is pumped.…”