Inspection device for hydraulic equipment, inspection system for hydraulic equipment, work vehicle, and inspection method for hydraulic equipment

An inspection device for a hydraulic equipment, the inspection device comprising:

• a hydraulic circuit including a branch valve;
• an optical detection section including an inspection oil passage connected to the branch valve, the inspection oil passage including a filter arranged to collect foreign matter;
• a pump configured to supply oil to the hydraulic circuit;
• and
• a controller configured to operate the branch valve to supply oil to the inspection oil passage upon determining that a foreign matter inspection will be performed, the branch valve being operated from a state in which the branch valve stops the oil from being supplied to the inspection oil passage,
• the optical detection section including
• a first foreign matter detection section arranged on an upstream side of the filter, the first foreign matter detection section being configured to detect foreign matter,
• a second foreign matter detection section arranged on a downstream side of the filter, the second foreign matter detection section being configured to detect foreign matter, and
• a bubble detection section arranged on a downstream side of the filter, the bubble detection section being configured to detect a bubble contained in oil after the oil has passed through the filter in order to acquire data regarding detection accuracy,
• the inspection oil passage being disposed on an upstream side of the pump and configured to branch from the hydraulic circuit via the branch valve and merge back with the hydraulic circuit, and
• the bubble detection section being arranged between the filter and the pump.