TM 9-4110-255-14
5-40. COMPRESSOR B1 TESTING, SERVICE, REPAIR, AND REPLACEMENT .-Continued
(3) Remove Oil.
(a) Place drain pan under drain plug (20).
(b) Remove drain plug (20) and allow oil to drain as necessary.
(c) Install drain plug (20). Contact your local environmental officer for guidance on how to properly
dispose of compressor oil in accordance with local regulation.
(4) Replace dehydrator (para 5-17). Leak check (para 5-13), evacuate (para 5-14), and charge (para 5-15) the
refrigeration system.
c. Repair. Repair is limited to replacement of damaged components.
(1) Valve Plate Assembly.
(a) Discharge the refrigeration system (para 5-10).
WARNING
Dangerous pressure can remain trapped in compressor cylinder head. Removal of cylinder head
bolts prior to relieving pressure can result in personal injury.
(b) Loosen but do not remove six screws (1), and two studs (2). If cylinder head (3) is not loose, tap with
lightweight hammer to loosen.
NOTE
Valve plate, suction valves, position springs, and dowel pins may come off when removing
cylinder head.
(c) Remove six screws (1), lifting lug (4), two studs (2), cylinder head (3), and cylinder head gasket (5).
Discard cylinder head gasket.
(d) Remove four screws (6), lock washers (7), two discharge valve stops (8), and discharge valves (9).
Discard lock washers and discharge valves.
(e) Install two screws (6), without lock washers (7), into the outermost discharge valves (9) mounting
holes to act as jackscrews to release valve plate (10).
(f) Remove valve plate (10), valve plate gasket (11), two suction valves (12), position springs (13), and
four dowel pins (14). Discard valve plate gasket and suction valves.
(g) Remove any gasket material from all machined gasket surfaces and in tall four dowel pins (14), two
s
position springs (13) contacting on the ends and bowed out in the middle, new suction valves (12),
new valve plate gasket (11), and valve plate (10).
(h) Check that suction valves (12) do not bind on valve plate gasket (11) by gently pushing on suction
valve through intake hole in valve plate (10). Adjust valve plate gasket as necessary to prevent
suction valve binding.
5-74
