G02182 G03219
526  APU Lubrication System Component Location 
Feb 15/70  Figure 1  49-91-0 
Page 3 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

APU Lubrication System Flow diagram  513 
49-91-0  Figure 2  Feb 15/79 
Page 4 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

OIL PUMP - UNIT SERVICING
1.  Equipment and Materials
A.  Cleaning Solvent - Federal Specification P-D-680
2.  Prepare for Oil Pump Servicing
A.  Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is "in work."
B.  Open the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
C.  Open APU compartment access door latches and open access door. Install door support rods.
D.  Support lower shroud, open shroud latches, and remove shroud.
CAUTION:  EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
3.  Replace Oil Filter Element (Fig. 301)
A.  Remove filter cap, packing, and filter element. Catch dripping oil in suitable container. Discard filter element and packings.
B.  Clean cap in solvent and dry thoroughly with clean, compressed air.
WARNING:  SOLVENT IS TOXIC; USE IN WELL-VENTILATED AREA. KEEP AWAY FROM FLAME.
C.  Lubricate and install new O-ring packing in filter element.
D.  Lubricate and install new O-ring packing on filter cap.
E.  Place filter element on centering boss of oil pump housing.
F.  Position filter cap over filter element and screw cap into oil pump housing. Tighten cap and lockwire.
CAUTION:  DO NOT EXCEED TORQUE VALUE OF 25 POUND-INCHES WHEN TIGHTENING OIL FILTER CAP.
500 
Jun 20/83  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-91-11 Page 301 

G03094
Oil Pump Unit Servicing  500 
49-91-11  Figure 301  Jan 20/83 
Page 302 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  Restore Airplane to Normal Configuration
A.  Position lower shroud against upper shroud and close shroud latches.
CAUTION:  MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B.  Disengage APU compartment access door support rods and stow rods. Close and latch access door.
C.  Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
D.  Position BATTERY SWITCH to ON and remove placards.
500 
Nov 15/70  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-91-11 Page 303 

OIL PUMP -REMOVAL/INSTALLATION
1. General
A.  This section covers the removal and installation of the oil pump assembly consisting of an oil pump, oil filter, oil temperature switch, sequencing oil pressure switch and low oil pressure switch. For removal and installation of the sequencing oil pressure switch and low oil pressure switch, refer to 49-61-41 and 49-61-51 respectively.
2.  Prepare to Remove Oil Pump
A.  Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is "in work."
B.  Open the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
C.  Open APU compartment access door latches and open door. Install door support rods.
D.  Support lower shroud, open shroud latches, and remove shroud.
CAUTION:  EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
E.  Remove starter motor (Ref 49-41-11, Removal/Installation).
F.  Drain oil tank (Ref 49-91-31, Unit Servicing).
3.  Remove Oil Pump (Fig. 401)
CAUTION:  IF OIL PUMP ASSEMBLY IS BEING REPLACED DUE TO INTERNAL FAILURE CHECK OIL FILTER ELEMENT AND ACCESSORY DRIVE GEARCASE FOR EVIDENCE OF METAL PARTICLES. REMOVE ALL VISIBLE PARTICLES FROM GEARCASE. ASCERTAIN CORRECT CAUSE OF FAILURE PRIOR TO INSTALLATION OF NEW OIL PUMP.
A.  Disconnect electrical plug from sequencing oil pressure switch.
B.  Disconnect electrical plug from low oil pressure switch.
C.  Disconnect oil cooler inlet line from fitting on oil pump. Catch dripping oil in suitable container.
　
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