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Operational Performance of Agricultural Machineries Managed by Custom Hiring (UPJA) in Banyumas District of Central Java Province Bambang Purwantana1, Murtiningrum1, Sri Markumningsih1, Muhammad Makky2, Aswaldi Anwar2 1Department of Agricultural and Biosystems Engineering, Universitas Gadjah Mada, Jl. Flora, Bulaksumur, Yogyakarta 55281, Indonesia 2Faculty of Agricultural Technology, Universitas Andalas, Kampus Unand Limau Manih, Padang 25163, Indonesia E-mail: bambang_pw@ugm.ac.id ; tiningm@ugm.ac.id; sri_markumningsih@ugm.ac.id Abstract. Agricultural mechanization, especially in term of utilization of agricultural machinery, has important role in increasing capacity, efficiency, and effectiveness of agricultural production process. Therefore, in order to mechanize Indonesian agricultural system, Ministry of Agriculture has facilitated farmers with many agricultural machineries. Farmer institutions that were formed and designated to utilize and manage those agricultural machineries is Agricultural Machinery Custom Hiring (UPJA, Usaha Pelayanan Jasa Alat mesin pertanian). In this research, the operational performance of agricultural machineries managed by the custom hiring (UPJA) in Banyumas District of Central Java Province were studied. The research was done by desk study, focus group discussion, field survey to 7 of 49 UPJA, and measuring the operational performance of machineries utilized by those UPJA. The results showed there was still no professional UPJA available in Banyumas. All of UPJA were in beginner status. The common owned and operated agricultural machinery was hand tractor, while four wheel tractor, rice transplanter, power weeder, and rice combine harvester were limited. In general the operational performance of the machines were low. The most factor affected the performance were time required for transportation from garage to the field. In case of hand tractor, the time consumed for transportation was 8-14% of total working hour per day (8 hours). For four wheel tractor, rice transplanter, and rice combine harvester, the time required for transportation were 4-9%, 8-16%, and 9-18% of total working hour respectively. The other factors slightly affected the operational performance were time losses due to machine preparation or setting and machine trouble. It is suggested to facilitate towing truck to transport the machines, or develop garage not far from field area. Empowering UPJA in management and technical skills are also needed. Keywords: Performance; operational; machinery; custom hiring