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Table 2-1.  Controls and Instruments (Contd)
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TM-1-4920-446-13P Hydraulic System Test Stand Type D-8A P/N 7459 Manual
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Figure 2-2.  Instrument Panel Assy, D-6A
TM 1-4920-446-13 & P Never operate the test stand if the hydraulic fluid reservoir is less than half full.  System damage could result.  Replenish as required. e.  Inspect piping and fittings for obvious leaks. f.  Close and secure all doors except those giving access to the control panel and electrical components panel. 2-4.  Pre-operation Control Settings.  Set the operating controls as listed in Table 2-2. 2-5.  Pre-operation Fill and Bleed Procedure.  With the controls set as specified in paragraph 2-4, proceed as follows: a.  Set circuit breaker (CB1) to ON position to set up hydraulic pump. b.  Turn outlet selector (14, Figure 2-2) to valve closed position. c.  Make certain flow control valves (12 and 13) are closed. d.  Activate bleed valve (on top of the low pressure filter) to bleed air from the system.  Continue to actuate bleed valve until system is purged of air (Paragraph 1-19). e.  Replenish the hydraulic reservoir to the proper level (3/4 full) with hydraulic fluid, MIL-H-83282.  Observe fluid level gauge. 2-6.  The test stand is now full and air free. 2-7.  Preliminary Adjustments and Control Settings.  The test stand system is filled with hydraulic fluid at the completion of the procedures in paragraph 2-5.  It is now necessary to set the stand controls to accommodate the test to be run. a.  Set the reservoir shutoff valve to the closed position (9, Figure 2-2). b.  Depress start pushbutton (25). c.  Set the selector valve (8) to the LP filter in position. d.  Open flow control valve (12 or 13).  Turn valve counterclockwise. e.  Slowly close HP  bypass valve (7). f.  Adjust HP relief valve (10) to closed (fully clockwise) position. g.    Adjust  compensator  control  (6)  to  achieve  an  output  pressure  of  3300  psi  as  indicated  on  the  fluid  pressure gauge. h.  Reset HP relief valve (10) to obtain a reading of 3000 psi on the fluid pressure gauge (2). 2-5

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