7–7. SYSTEM DESCRIPTION (cont)

TM 1-1520-238-T-5 Change 6 7–25 7–7. SYSTEM DESCRIPTION (cont) 7–7 (f) The primary GSE panel provides a means for servicing and bleeding the primary hydraulic system with the use of ground support equipment. The hand pump (fig. 7–11) services the primary and utility reservoirs from a bulk container of hydraulic fluid and charges the accumulator to 3000 psi. Positioning the selector lever on the manifold inboard (fill primary reservoir) rotates the camshaft causing the M1 check valve to open. The low pressure fluid entering the fill port is filtered by a 45 micron screen filter (ADF) or a 5 micron cartridge filter element (ADG) and enters the hydraulic pump manifold by overriding spring poppet B. The bellcrank handle is then manipulated, forcing fluid through check valve M1 into the primary reservoir. Spring poppet valve A remains closed due to high back pressure (3000 psi) from the accumulator.