AIR CYCLE MACHINE - UNIT SERVICING
1. General
A.  The procedure outlined in this section is for replacing oil in the air cycle machine. For topping of oil refer to Chapter 12, Air Cycle Machine - Servicing.
2.  Equipment and Materials
A.  Lubricant: Oil as approved by AiResearch Manufacturing Company, 9851-9951 Sepulveda Boulevard, Los Angeles, California 90009
3.  Replace Air Cycle Machine Oil
A.  Open air conditioning equipment bay doors.
B.  Remove the chip detector plug from the drain plug in the bottom of the oil sump (Fig. 301).
CAUTION:  THE CHIP DETECTOR PLUG SHOULD NOT HAVE ANY METAL PARTICLES ON IT. THE PRESENCE OF METAL PARTICLES IS A SIGN OF WEAR IN THE AIR CYCLE MACHINE AND OF POSSIBLE ACM FAILURE.
C.  Inspect the chip detector plug for metal particles and clean plug if required.
D.  Remove filler plug from top of oil sump.
E.  Hold container below the drain plug.
F.  Remove drain plug and allow oil to drain completely.
G.  After oil has drained, install the drain plug with a new O-ring.
H.  Install chip detector plug with new O-ring into drain plug.
I.  Fill air cycle machine until oil starts to flow from filler port.
NOTE: Oil sump should hold approximately 300 cc of oil.
J.  Install the filler plug with a new O-ring in the filler port.
K.  Close air conditioning equipment bay doors.
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AIR CYCLE MACHINE (ACM) - REMOVAL/INSTALLATION
1. General
A.  Two air cycle machines (ACM) are provided for the air cycle air conditioning systems. Since the left and right ACM installations are alike, the following procedure will apply to either.
2.  Prepare ACM for Removal
A.  Lower air conditioning equipment bay doors.
B.  Drain oil from air cycle machine.
3.  Remove ACM
A.  Remove compressor and turbine inlet and outlet flexible couplings. Ref 21-51-61, Flexible Coupling Assembly - Removal/Installation.
B.  Remove compressor discharge overheat switch from ACM compressor scroll.
C.  Remove ACM from mount assembly.
(1)  Remove two forward mounting bolts, loosen aft mounting nut and slide ACM forward. (Detail A, Fig. 401) Do not remove two index plate bolts securing index plate to support bracket assembly.
D.  Remove ACM.
4.  Install ACM
A.  Check that flexible coupling sleeve and ring are in place on ACM connecting ducts.
NOTE:  Procedure for installation of flexible couplings depends on whether a new coupling or old coupling is being used to connect ducts to ACM. Ref 21-51-61, Flexible Coupling Assembly - Removal/Installation, for recommended coupling installation procedure.
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B.  Lift ACM into place and secure with three mounting bolts (Detail A, Fig. 401).
C.  Move compressor inlet and turbine outlet ducts into place.
D.  Move compressor outlet and turbine inlet ducts into place.
E.  Check ACM for alignment with ducts. If alignment is necessary, adjust ACM per step F. If alignment of ACM is not required, proceed with step G.
F.  Adjust ACM to align with mating ducts.
(1)  Loosen two index plate bolts securing index plate to support bracket assembly to allow movement of ACM forward or aft. Add or remove one washer to aft mounting bolt between index plate and support bracket to tilt ACM as required. Retighten two index plate bolts and aft mounting nut.
G.  Install flexible coupling assembly at turbine and compressor inlets and outlets (Ref 21-51-61, Removal/ Installation.
H.  Install compressor discharge overheat switch in ACM compressor scroll.
I.  Service ACM (Ref Chapter 21, Unit Servicing.
J.  Provide electrical power.
K.  Pressurize pneumatic system to approximately 25 psi.
　
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