An instruction plate on the bottom end of the G4088 turbopumpshaft preload
fixture assembly located on the LOX inlet
closure; the G4088 prevents excessive vibration of the turbopump shaft
during shipping.
The ID plate reads
Instructions
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Wipe external surfaces of RK395-44034-021 closure using clean hemmed nylon
cloth moistened with unused denatured ethyl alcohol (MIL-A-6091).
-
Shroud area to prevent contaminants from entering pump.
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Remove four bolts and washers at Points "X".
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Remove Cup, Assy of from Closure, Assy of.
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On 9026818 Closure Assy, position grommet approx .12 from snap ring.
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Install clean closure assy torquing AN4-7A bolts sufficiently only to seat
closure assy firmly, then tighten bolts an additional 90 to 100 degrees.
-
On 9026859 Bracket, Assy of, disengage lock from preload screw and back
screw out until it stops.
-
Install bracket using four MS20007H22 bolts and washers. Torque bolts
60-120 in lb (initial load).
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Rotate (clockwise) preload screw until all slack is removed from between
spring washers and adjacent surfaces. Then torque screw 60 to 100 in lb.
-
Note slot in preload screw lockplate nearest lock pawl. Then rotate
(clockwise) preload screw 8 plus or minus one-half slots. Engage lock
pawl.
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Torque lock pawl retaining bolt 36 to 47 in lb. and lockwire pawl to
preload screw.
-
Torque the four MS20007H22 bolts 400 to 450 in lb and lockwire per
RAQ101-002.
The diagram at the top of the plate calls out the "Lock Pawl", "Humidity
Indicator 2 Places", "Point 'X' 4 Places", "9026859 Bracket, Assy of",
"MS20007H22 Bolt", "Closure, Assy of", "Preload Screw", "Lock Plate", "Spring
Washers", "Snap Ring", "Grommet", "AN4-7A Bolt", and "9026818 Closure Assy
Replaces Cup, Assy of".
For additional information on the G4088, see my F-1
turbopump closure assemblies page.
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