TM 10-4610-246-13
5.8
MAINTENANCE OF LOWER MAIN CASE/MEASURING CHAMBER - (Cont)
(2)
Inspect disc for wear around edges or around the center ball. If the spindle is worn to half its normal diameter
or is damaged, replace.
NOTE
Disc halves must be replaced as a set.
(3)
Inspect chamber halves for grooves or pitting. If such damage is found, replace.
(4)
Inspect upper gasket for tears or damage. It should also be pliable. Replace if torn, deformed, or brittle.
d.
Repair.
Repair is accomplished by replacement of parts.
e.
Assembly.
(1) Insert thrust roller (5, Figure 5-13) into disc (3).
(2)
Place disc (3) in lower chamber half (2).
(3)
Place thrust insert (4) in groove of lower chamber half (2), with smooth edge to the inside.
(4)
Place upper chamber half (1) on lower chamber half (2), fitting insert (4) into slot in upper chamber half (1).
(5)
Place port gasket (6, Figure 5-12) over hole in chamber assembly (4).
(6)
Place screen in lower housing (3).
(7) Slide chamber assembly (4) into lower housing (3). Ensure that port gasket (6) is lined up with outlet port in
lower housing (3).
(8) Place retaining spring (5) in its slot on chamber assembly (4). Retaining spring will sit in slots with crosspieces
up.
(9) Check disc to make sure it is installed correctly by blowing into outlet port on lower housing. It should nutate with
little blowing effort. If it does not nutate freely, make sure you are blowing into outlet port. If it still does not
nutate freely, replace chamber disc assembly.
(10)
Place new upper gasket (1) on lower housing (3).
(11)
Fasten upper main case assembly (2, Figure 5-5) to lower main case assembly with eight hex head bolts (1).
Torque to 15 ft lb (20.3 N-m).
5-18
