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PTU Control Valve
The PTU control valve controls the hydraulic system A pressure
that goes to the motor of the power transfer unit.
EDP Pressure Switch Auto Slat System
The EDP pressure switch auto slat system monitors the
pressure from the hydraulic system B engine-driven pump.
The signal from the switch goes to the control circuit for the PTU
control valve.
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HYD POWER TRANSFER UNIT SYSTEM - GENERAL DESCRIPTION
HYD POWER TRANSFER UNIT SYSTEM - GENERAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The power transfer unit (PTU), supplied with fluid from the
system B reservoir, provides an alternate source of pressure to
the lead edge flaps and slats.
The PTU pressure filter module cleans the pressurized fluid
from the PTU pump.
Location
The PTU is on top of the keel beam in the main gear wheel well.
The PTU pressure filter is in the main gear wheel well below the
bracket for the system B EMDP.
The PTU flow limiter is upstream of the PTU control valve on the
forward bulkhead in the main gear wheel well.
Physical Description
The PTU assembly has these components:
* A fixed displacement, piston type motor. The motor is limited
to 13.7 gpm by a flow limiter.
* A fixed displacement, inline piston type pump. The pump is
rated at 11.6 gpm.
The PTU pressure filter module is non-bypass type with a 5-15
micron, non-cleanable, cartridge type filter element.
The PTU pressure filter module has these components:
* Filter module head
* Filter bowl
* Replaceable filter element.
Functional Description
The PTU motor uses system A pressure to drive the system B
supplied pump without a transfer of fluid between the two
systems.
Case drain fluid cools and lubricates the motor and pump. The
case drain fluid for the motor returns to the system A reservoir
through the return filter module. Case drain fluid from the pump
returns to the system B reservoir through the electric motordriven
pump case drain filter module. If case drain fluid from the
pump temperature is above normal, the hydraulic fluid overheat
warning switch turns on the system B OVERHEAT light.
See the hydraulic indicating system for information about the
hydraulic fluid overheat warning switches. (SECTION 29-30)
Check valves in the pressure line and case drain line of the PTU
pump prevent backflow from system B.
The PTU pressure filter cleans the PTU pump fluid before it
enters system B and goes to the leading edge flaps and slats.
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The PTU flow limiter limits the flow of hydraulic fluid from
system A that goes through the PTU control valve. The hydraulic
fluid flow limit is 13.7 gpm.
Training Information Point
WARNING: MAKE SURE PERSONS AND EQUIPMENT ARE
CLEAR OF THE LEADING EDGE FLAPS AND
SLATS. THE LEADING EDGE FLAPS AND SLATS
CAN MOVE QUICKLY. THIS CAN CAUSE INJURY
TO PERSONS OR DAMAGE TO EQUIPMENT.
CAUTION: INSTALL THE PTU WITH THE MOTOR ON THE
LEFT SIDE OF THE AIRPLANE. THE SYSTEM WILL
NOT OPERATE IF YOU INSTALL IT INCORRECTLY.
If metal contamination is found in the PTU pressure filter
module, you must replace the PTU assembly.
NOTE: You must fill the PTU motor and pump with hydraulic
fluid BMS3-11, TYPE IV until they are half full to prevent
cavitation.
You can not clean the filter element and use it again.
NOTE: If you replace the PTU pressure filter module or
element you must do a PTU pressure filter module
operational test.
HYD POWER TRANSFER UNIT SYSTEM - POWER TRANSFER UNIT, PTU PRESSURE FILTER MODULE
EFFECTIVITY
　
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