Rexroth A7V AA6VM Series Hydraulic Axial Piston Variable Motor AA6VM80HD2/63W-VSC520B AA6VM80HD2/63W-VSC520B

Notes ▶ Theoretical values, without efficiency and tolerances; values rounded ▶ Operation above the maximum values or below the minimum values may result in a loss of function, a reduced service life or in the destruction of the axial piston unit. Other permissible limit values, such as speed variation, reduced angular acceleration as a function of the frequency and the permissible angular acceleration at start (lower than the maximum angular acceleration) can be found in data sheet 90261. Hydraulic fluids The variable motor A6VM is designed for operation with mineral oil HLP according to DIN 51524. Application instructions and requirements for hydraulic fluids should be taken from the following data sheets before the start of project planning: ▶ 90220: Hydraulic fluids based on mineral oils and related hydrocarbons ▶ 90221: Environmentally acceptable hydraulic fluids ▶ 90222: Fire-resistant, water-free hydraulic fluids (HFDR/HFDU) ▶ 90223: Fire-resistant, water-containing hydraulic fluids (HFAE, HFAS, HFB, HFC) ▶ 90225: Axial piston units for operation with water-free and water-containing fire-resistant hydraulic fluids (HFDR, HFDU, HFB, HFC). Filtration of the hydraulic fluid Finer filtration improves the cleanliness level of the hydraulic fluid, which increases the service life of the axial piston unit. A cleanliness level of at least 20/18/15 is to be maintained according to ISO 4406. At very high hydraulic fluid temperatures (195 °F (90 °C) to maximum 217 °F (103 °C), measured at port T), a cleanliness level of at least 19/17/14 according to ISO 4406 is necessary.

Influence of case pressure on beginning of control An increase in case pressure affects the beginning of control when using the following control options: ▶ HD, EP, HA, HA.T: Increase ▶ DA: Decrease With the following settings, an increase in case pressure will have no effect on the beginning of control: HA.R and HA.U, EP, HA The factory setting of the beginning of control is made at pabs = 15 psi (1 bar) case pressure

Permissible pressure loading The service life of the shaft seal is influenced by the rotational speed of the axial piston unit and the leakage pressure in the housing (case pressure). Momentary (t < 0.1 s) pressure peaks of up to 145 psi (10 bar) are allowed. Case pressures of a continuous 30 psi (2 bar) maximum are permitted to be able to utilize the entire speed range. Higher case pressures are permissible at lower rotational speeds (see diagram). The service life of the shaft seal decreases with increasing frequency of pressure peaks and increasing mean differential pressure. The case pressure must be equal to or higher than the ambient pressure

The FKM shaft seal ring may be used for leakage temperatures from -13 °F to +240 °F (-25 °C to +115 °C). For application cases below -13 °F (-25 °C), an NBR shaft seal is required (permissible temperature range: -40 °F to +195 °F (-40 °C to +90 °C).

A7V.