TM 9-4940-556-14&P
6.2.4.8 Repeat 6.2.4.2 thru 6.2.4.7 for other pump body if necessary.
6.2.4.9 Turn pump by hand to be certain piston (item 17) DOES NOT BIND.
6.2.4.10 Connect unit to power, turn main power ON, turn pump ON. If
water leaks out of packing, turn pump OFF and tighten packing nut. A
slight weeping is preferable to packing nuts being too tight.
6.3 UNLOADER - R & R (REFER TO DRAWING JP7219)
Remove copper tubing from item 5 & 6 coil inlet fittings assy.
6.3.1
6.3.2 Disconnect alleviator hose coupling (item 3 drawing JP7212) then
remove other end from tee (item 10 drawing JP7219).
Remove tee and attached fittings from unloader (item 10).
6.3.3
Remove hose connected to nipple at top of unloader (item 11).
6.3.4
6.3.5 Unscrew unloader (item 9) and/or check valve and adaptor (items 2,7,8)
as required.
6.3.6 Replace unloader and/or check valve as required, re-assemble in
reverse order.
6.4 OUTLET FITTINGS ASSEMBLY (REFER TO DRAWING JP7231)
6.4.1 Remove bonnet (stem assy. from outlet pressure relief valve
(item 14).
6.4.2 Remove temperature gauge and temperature control sensing bulbs from
fittings (item 12).
6.4.3 Remove outlet pressure gauge tubing line from item 11
6.4.4 Remove any other fittings necessary to provide clearance to unscrew
remaining vapor outlet fittings at the cross (item 12) screwed into the
stele (item 4).
6.5 COIL REMOVAL
6.5.1 Refer drawing JP7219 - Remove coil inlet fittings (6.3 thru 6.3.5) -
Remove items 3, 14, 13 and 1.
6.5.2 Refer drawing Jp7231 - Remove coil outlet fittings (6.4 thru 6.4.4) -
Remove item 16 coil outlet nipple.
Remove coil casing ring with rain cap attached.
6.5.3
Remove two bolts which secure top of coil to coil casing.
6.5.4
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