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 C.  The pressure regulator valve is a spring-loaded valve in the oil pump. The pressure regulator valve opens when the oil pressure is more than 90 psig (620 kPa). This permits the oil to go back to the inlet of the pressure pump and keep a constant pressure in the APU lubrication system.
 D.  The oil filter is found on the oil pump. The oil filter keeps the unwanted material from the pressure pump. The base of the oil filter is part of the body of the oil pump. The oil filter element is closed in the case. The case can be removed from the oil filter.
 E.  The filter bypass valve is a spring-loaded valve that is found in the oil pump. The filter bypass valve opens when the oil filter element is clogged to permit oil to go by the filter. This will continue the flow oil to the APU engine.
 3.  Oil Cooler
__________
 A.  The oil cooler is a cylindrical unit that is closed in a shell. The oil cooler has mechanically bonded tubes made of aluminum. The oil cooler is installed on the lower front side of the APU. The oil from the scavenge pump passes through the oil cooler before it goes back to the oil tank. The oil cooler uses the cool air from the cooling fan to decrease the temperature of the oil.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
PORT EXHAUST 
SEE  A  VENT PORT FOR THE OIL TANK 
VENT LINE FOR THE OIL TANK 
SEE  B 
INLET LINE FOR THE OIL COOLER A  SEE  C  OIL TEMPERATURE SWITCH  OIL PUMP  B 

OIL COOLER  OIL LEVEL SWITCH 
THE OIL COOLER OUTLET LINE FOR  DRAIN PLUG  FWD
C
Figure 1 APU Lubrication System Component Location 

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4.  Oil Tank
________
 A.  The oil tank has the oil supply for the APU engine. The oil tank is installed on the left side of the APU engine. The oil tank has a vent to the turbine exhaust port. An air-oil separator in the oil tank removes the air from the oil in the oil tank. This air goes through the vent line for the oil tank to the turbine exhaust port. An oil level switch in the oil tank sends a signal for a low oil quantity to the control cabin.
 5.  Operation (Fig. 2)
_________
 A.  When the APU engine starts, the oil is supplied to the APU engine through the pressure pump and oil filter. If the oil filter element is clogged, the bypass valve opens to permit the oil flow to continue. From the oil pump, the oil goes to the accessory drive, the front compressor bearings, and the bearings between the compressor impeller and the turbine wheel. This will supply the lubrication to all the gears and bearing of the APU engine. The oil pressure regulator opens if the oil pressure increases to more than 90 psig (620 kPa).
 B.  The oil in the APU engine drains into the oil sump of the accessory drive and the bearing cavity between the compressor impeller and the turbine wheel. The scavenge pump moves the oil through the oil cooler to the oil tank. The air-oil separator removes the air from the oil in the oil tank. This air goes through the vent line for the oil tank to the turbine exhaust port.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
OIL COOLER 
SWITCH FOR THE  SEQUENCING SWITCH FOR 
LOW OIL PRESSURE  THE OIL PRESSURE  COOLING AIR OUTLET 
FOR THE OIL COOLER 

OIL 
TEMPERATURE  FILTER 
　
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