TM 10-4610-244-13
TM 09476B-13/1
4-22. REPAIR MAINLINE PIPING AND RANGE ADJUSTING VALVE (Cont'd).
a.
DISASSEMBLY
(1)
Mark position of mainline pipe (4), hangers (5) and range adjusting valve (7) for later assembly.
(2)
Remove eight locknuts (1), bolts (2) and washers (3) from mainline pipes (4). Discard locknuts (1).
(3)
Remove hangers (5) from ends of mainline pipes (4), remove gaskets (6), and remove range adjusting
valve (7).
(4)
Remove handle set screw (8) and remove handle (9).
(5)
Mark position of position plate (13) for later assembly
(6)
Remove two socket screws (10), nuts (11), and washers (12), and remove position plate (13).
(7)
Remove six socket screws (14) and nuts (15) from range adjusting valve (7).
(8)
Pull range adjusting valve halves (16) apart, collapsing seat (17) to make easier
(9)
Remove stem/disc (18), and seat (17) from valve half (16)
(10)
Remove bearing (19) from stem/disc (18).
(11)
Remove seat (17) from stem/disc (18) by collapsing and sliding off of end of stem
(12)
Remove and discard preformed packing (20).
b.
REPAIR
(1)
Clean all components
(2)
Inspect seat (17) for brittleness, tears, or grooves Replace if necessary
(3)
Inspect stem/disc (18) for cracks, grooves, chips, or wear on sealing surfaces Replace if necessary.
(5)
Ensure bearing (19) fits snugly on stem/disc (18). Replace if necessary.
(6)
Inspect handle (9) for broken spring, or worn tip. Replace if necessary
(7)
Inspect valve body halves (16) for cracks or breaks. Replace if necessary.
(8)
Inspect all screws, bolts and nuts for corrosion, or worn threads Replace if necessary
(9)
Inspect mainline pipes (4) for holes, or cracks. Replace if necessary
(10)
Inspect gaskets (6) for tears, brittleness, or deterioration Replace if necessary
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