The spare 780-pound coolant pump, built by Boeing, is mounted on an external platform just in front of the station’s airlock module, relatively close to the faulty pump module.

The spare 780-pound coolant pump, built by Boeing, is mounted on an external platform just in front of the station's airlock module, relatively close to the faulty pump module.

The fan is usually mounted on an extension of the water pump shaft and is driven by V-belt from a pulley mounted on the front end of the cramshaft.