Selling Cheap Heavy Equipment Spare Parts from Mustika Mandiri Diesel Stores in Jakarta. Spare Part is an object that consists of several components that form a single unit and has a certain function. Heavy equipment consists of many components, which often suffer damage and replacement due to usage. There are some components that are also contained in it some small components, for example an engine that has components inside it are fuel injection pump, water pump, starting motor, alternator, oil pump, compressor, power steering pump, turbocharger, etc.