The purpose of this research is to determine the plant reliability and propose a proper
maintenance strategy that can be applied in dry processing factory of Cooperativa Café Timor
(CCT), East Timor. The analysis done such as: plant reliability, failure rate, optimum interval
preventive maintenance, and spare part inventory.
The analysis of plant reliability is done to know the reliability of the plant and type of
plant reliability system. The plant reliability is 0.99915 with series system. The analysis of
failure rate is done with purpose to find a proper maintenance strategy for the potential
subsystems (machines), such as peeler polisher and elevator 1. The analysis shows that the
failure rate curve of peeler polisher and elevator 1 are increasing, therefore a proper maintenance
strategy that can be applied is preventive maintenance. The analysis of optimum interval
preventive maintenance is done to know the optimum interval time in doing the preventive
maintenance. The optimum interval for peeler polisher and elevator are 1,229 Hours and 634
Hours respectively. The analysis of spare part inventory is done in order to ensure that the spare
part is available when needed. This analysis is done using the Classical Economic Order
Quantity (EOQ) Model, where the result shows that the order quantity of peeler polisher and
elevator 1 are 7 and 9 Units respectively and reorder point are the same, which is 1 Unit.
Based on the analysis and discussion, a proper maintenance strategy that can be applied
on peeler polisher and elevator 1 is preventive maintenance, where the preventive maintenance
for peeler polisher will be done by over-time, whereas for elevator 1 will be done during the
break hours of the workers.