757 AMM 飞机维护手册 液压 CHAPTER 29 - HYDRAULIC POWER 2(77)

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 (f)  tube at the hydraulic pump housing (17).Write this shim thickness for each hydraulic tube (24, 25, 26) in Table II.
 (g)  For each hydraulic tube (24, 25, 26), subtract dimension A from dimension D to calculate the shim thickness for the end of the
 (h)  tube at the RAT strut housing (16).Write this shim thickness for each hydraulic tube (24, 25, 26) in Table I.
 (i)  Get shims (29) that have the thickness which was calculated in Table I and Table II.
 NOTE: The shim thichness must be |0.003 inch of the calculated____ thickness.
 (j)  Identify the shims (29) for the correct location for subsequent installation.
 (k) (l)  Loosen the tube nuts (27) at the top of the three hydraulic tubes (24, 25, 26) until the tube nuts (27) disengage from the RAT strut housing (16).Loosen the tube nuts (27) at the bottom of the three hydraulic tubes (24, 25, 26).
 NOTE: Do not remove the three hydraulic tubes (24, 25, 26)____ from the hydraulic pump (17).
 (m)  Remove the bolts (32) that hold the hydraulic pump (17) to the RAT strut housing (16).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 (n)  
Remove the hydraulic pump (17) with the hydraulic tubes (24, 25, 26) attached to it.

 (o)  
Remove the hydraulic tubes (24, 25, 26) from the hydraulic pump (17).

 S 424-072
 (2)  Do the steps that follow to install the hydraulic pump (17):
 (a)  
Apply a layer of hydraulic lubricant or hydraulic fluid on the new O-rings.

 (b)  
Install the shims (29), backup rings (30), and O-rings (31) on the end of each of the hydraulic tubes (24, 25, 26).

 (c)  
Install the hydraulic tubes (24, 25, 26) on the hydraulic pump (17).

 (d)  
Tighten the tube nuts (27) on each hydraulic tube (24, 25, 26) by hand.

 (e)  
Put the hydraulic pump (17) in its position on the RAT strut housing (16) and engage the hydraulic tubes (24, 25, 26) with the RAT strut housing (16).

 (f)  
Make sure the hydraulic pump (17) is flat against the RAT strut housing (16).

 (g)  
Install the washers (33) and bolts (32) to attach the hydraulic pump (17) to the RAT strut.

 (h)  
Tighten the bolts (32) by hand until they touch the self-locking property of the threads in the RAT strut housing (16).

 (i)  
Tighten the tube nuts (27) as follows: 1) Tighten the tube nuts (27) on the case drain tube (24) to 30-40 pound-feet. 2) Tighten the tube nuts (27) on the outlet tube (25) to 40-50 pound-feet.

 3)  Tighten the tube nuts (27) on the inlet tube (26) to 40-50 pound-feet.

 (j)  
Measure the clearance between the hydraulic pump housing (17) and the RAT strut housing (16).

 (k)  
If the clearance is more than 0.060 inch, do the steps to find the thickness of the shims (29) again.

 (l)  
If the clearance is 0.00 to 0.060 inch, tighten the bolts (32) to 20-22 pound-feet.

 (m)  
Apply a layer of sealant, RTV732, on these surfaces: 1) The mating surfaces around the tube nuts (27). 2) The surface around the joint between the hydraulic

 pump (17) and the RAT strut housing (16).

 (n)  
Safety the tube nuts (27) with a lockwire.

 I.  Install Hub (Fig. 402)
　
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