Patent ID: 8968573
Filing Date: 2015-03-03
Classification: B66F,F15B

Abstract:
1. A method for cleaning hydraulic liquid in an industrial truck, wherein said industrial truck has an electrical motor, a battery as an energy source, and a hydraulic system including a hydraulic pump, a hydraulic reservoir, and a return pipe to the hydraulic reservoir with a return filter, wherein the method comprises the steps of: a. activating the hydraulic pump for hydraulic activity; b. using the hydraulic pump during hydraulic activity to pump hydraulic liquid for the hydraulic activity, with a return flow passing through the return filter to the hydraulic reservoir; c. activating the hydraulic pump when hydraulic activity is not present to circulate the hydraulic liquid through the hydraulic reservoir and through the return filter to effect filtration of the hydraulic liquid when hydraulic activity is not present; and continuing step (c) until a sufficient purity of the hydraulic liquid is achieved as determined by at least one of the following procedures I and II and then terminating step (c) upon determination of a sufficient purity of the hydraulic liquid being achieved; procedure I including: procedure II including: