Hour meters and engine hours: which to service and bill on
Service on engine hours from the hour meter, where OEM intervals are set. Bill on the hours your hire terms name, and reconcile the two weekly.
How workshops keep machines available and record why they stop. This section covers MTBF, MTTR, availability, job cards, hour meters, pre-start checks and running a fleet from many manufacturers.
Articles
Maintenance Guide
Availability and utilisation in mining: the KPI formulas
Availability is the share of required time a machine was fit to work; utilisation, the share it worked. Formulas, a worked month and why figures differ.
- Job cardA job card is the written record of one maintenance or repair job on one machine, showing the machine and its hour meter reading, the fault, the work done, the parts and labour hours used, and the signatures that close the job and release the machine back to work.
- MTBFMTBF (mean time between failures) is the average operating time a repairable machine runs between one failure and the next, calculated as total operating hours in a period divided by the number of failures in that period.
- MTTRMTTR (mean time to repair, or mean time to restoration) is the average time taken to return a failed machine to working condition, calculated as total repair or restoration time in a period divided by the number of repairs in that period.
- UtilisationUtilisation is a measure of how much of a period a machine was actually operated, stated as a percentage of a chosen base such as calendar time, scheduled time or available time.
