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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-25-00-002
HYD POWER TRANSFER UNIT SYSTEM - POWER TRANSFER UNIT, PTU PRESSURE FILTER MODULE
HYD POWER TRANSFER UNIT SYSTEM - POWER TRANSFER UNIT, PTU PRESSURE FILTER MODULE
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-25-00-002
General
The PTU control valve opens to send hydraulic system A
pressure to the power transfer unit (PTU) motor.
The EDP pressure switch auto slat system sends a signal to the
control circuit for the PTU control valve.
Location
The valve is on the forward bulkhead below the hydraulic
system A EMDP in the main gear wheel well.
The EDP pressure switch auto slat system is on the hydraulic
system B pressure module.
Physical Description
The PTU control valve is a 28v dc motor-operated, two-position
shutoff valve. A manual position indicator arm on the valve
shows valve position, OPEN or CLOSED.
Functional Description
The PTU control valve lets system A pressure go to the PTU
motor automatically or manually. You use the position indicator
to open or close the PTU control valve manually.
The position indicator arm points to the OPEN marking on the
nameplate when the valve is open, and to the the CLOSED
marking when closed.
The EDP pressure switch auto slat system sends a ground to
the control circuit for the PTU control valve when the system B
EDP pressure decreases to less than 2350 psi.
HYD POWER TRANSFER UNIT SYSTEM - PTU CONTROL VALVE, EDP PRESSURE SWITCH AUTO SLAT SYSTEM
EFFECTIVITY
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Page 10
D633A101-GUN Oct 10/2004
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-25-00-003
HYD POWER TRANSFER UNIT SYSTEM - PTU CONTROL VALVE, EDP PRESSURE SWITCH AUTO SLAT SYSTEM
HYD POWER TRANSFER UNIT SYSTEM - PTU CONTROL VALVE, EDP PRESSURE SWITCH AUTO SLAT SYSTEM
EFFECTIVITY
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Page 11
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-25-00-003
General
The hydraulic power transfer unit (PTU) system uses hydraulic
system A pressure through a power transfer unit to pressurize
hydraulic system B for leading edge flaps and slats.
Control
The power transfer unit motor receives pressure from hydraulic
system A through the PTU control valve.
The EDP pressure switch auto slat system on the hydraulic
system B pressure module monitors for low pressure from the
system B EDP.
The control valve is a 28v dc hydraulic shutoff valve. A flow
limiter in the hydraulic system A pressure line to the control
valve limits the flow to the PTU motor to 13.7 gpm. This limits the
maximum speed of the motor.
Pressurization
When pressure goes to the PTU motor, the motor turns the PTU
pump through a common shaft. The PTU pump gets fluid supply
from the hydraulic system B reservoir. Pressure from the PTU
pump goes through a check valve and the PTU pressure filter
module. Pressure then goes to the leading edge flaps and slats.
Case Drain
The case drain fluid from the PTU pump goes through a check
valve and the hydraulic system B EMDP case drain filter before
it goes to the system B reservoir.
Training Information Point
CAUTION: MAKE SURE THE SYSTEM B HYDRAULIC
RESERVOIR IS PRESSURIZED. THE CHECK
VALVE FOR THE PTU CAN BE DAMAGED IF YOU
OPERATE THE PTU WITHOUT PRESSURE IN THE
HYDRAULIC RESERVOIR.
HYD POWER TRANSFER UNIT SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-25-00-004
HYD POWER TRANSFER UNIT SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC
HYD POWER TRANSFER UNIT SYSTEM - FUNCTIONAL DESCRIPTION - HYDRAULIC
EFFECTIVITY
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Page 13
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-25-00-004
General
The PTU control valve controls pressure to the PTU motor.
The PTU control valve opens for these conditions:
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