TM 5-4310-278-15
ers (30); secure with screws (29) torqued to
(9) Inspect all other parts for cracks,
3 foot-pounds.
worn or damaged threads, distortion, and other
(8) Before installing gear end cover (12),
damage, Replace all worn or damaged parts.
check interlobe clearance with long feeler gage
c. Reassembly and Installation.
inserted through intake and discharge ports as
(1) Refer to figure 6-2 to reassemble
shown in figure 6-3. Leading edge clearance
rotary compressor.
is measured through intake port. Trailing edge
(2) Install seals (25 and 32) in drive end
clearance is measured through discharge port.
and end plates. Apply a thin, even coat
Leading edge clearance must be 0.007 to 0.009
of sealant on the leading edge of seal shell at
inch. Trailing edge clearance must be 0.005 to
installation. Press seals into end frames with
0.007 inch. Adjust clearance by adding or re
lips toward ball bearing bores.
moving shims (19) as required. Since the gears
(3) Stake rotors on drive ends in arbor
are helical, changing the axial position of the
press. Make sure keyways are in line and point-
gears changes the relative rotation of the rotors.
ed in same direction. Place gear end plate,
(9) After completion of assembly, check
with seals installed, on rotors. Make sure rotors
that compressor shafts rotate freely, without
are in original position. Press gear end ball
binding or catching. Lubricate in accordance
bearings onto rotor shaft and into bearing
with current Lubrication order.
bores of end plate with flush side of bearings
(10) Install the rotary compressor (para
toward seals. Install bearing retainers (23).
3-28c) .
(4) Install spacers (20) and shims (19)
on ends of rotor shafts. Install keys (18) and
6-3. Coupling
press drive gear (17) on end of shaft. To in-
a. Removal and Disassembly. Remove and
stall driven gear, locate timing arrow as shown
disassemble compressor and parts as shown in
in figure 6-3 to prevent rotor jamming as gear
figure 3-8. Coupling is accessible and can be
is pressed onto shaft. Secure gears with rotor
disassembled as shown in figure 6-6.
shaft washer (15) and flat head screws (14).
b. Cleaning and Inspection.
Tighten screws to 3 foot-pounds.
(1) Clean all metallic parts with approved
(5) Check clearance between gear end
cleaning solvent; dry thoroughly.
plate and lobes. It must be 0.0003 to 0.0004
(2) Wipe spider with clean cloth.
inch, If it is not, check for proper seating
(3) Inspect all metallic parts for cracks,
of bearings in bores or on the shaft.
distortion, worn mounting surfaces, damaged
(6) Temporarily install housing (28) on
keyways, and other damage.
gear end plate (21); secure with four cap
(4) Inspect spider for cracks, wear, de-
screws. Aline match marks to assure that dis-
terioration or other damage.
charge port is in the required position.
(5) Replace all damaged parts.
c. Installation,
(1) Refer to figures 3-8 and 6-6 and in-
damaged if housing is installed with intake
stall coupling.
and discharge ends reversed.
(2) Install rotary compressor (para 3-
(7) Temporarily install drive end plate
28c).
(35) with four cap screws (3). Press bearings
Note. Keep the setscrews on the driven half of the
(31) on rotor shafts and into bearing bores of
flexible coupling loose when the bearing housing is
drive end plate, Make sure they are tightly
bolted to the engine flywheel
Then adjust the
seated against shoulders. Install bearing retain-
driven half of the coupling, and tighten the setscrews.
