R (1) Do a check of the internal leakage of the Power Transfer Unit (PTU)
R (Ref. AMM TASK 29-00-00-280-004).

R (2) If the internal leakage of the PTU is in the permitted limits:
R - do a functional check to monitor the internal leak rate of the
R Yellow and Green hydraulic systems (Ref. AMM TASK 29-10-00-220-R 001).

R (3) If the internal leak rate of the Yellow and Green hydraulic systems
R is in the permitted limits:
R
R - do the operational test of the PTU (Ref. AMM TASK 29-23-00-710-
003). R R - look for external leakage of the Yellow hydraulic system.
 4. Fault Isolation
_______________

 **ON A/C 001-049, 051-058, 101-101,
 A. If there is no external leakage and the pressure in the Yellow hydraulic system was less than 2100 psi during the operational test of the PTU:
 - replace the PTU-G/Y (1088GM) (Ref. AMM TASK 29-23-41-000-001) and (Ref. AMM TASK 29-23-41-400-001).
 (1) If the fault continues:

 - replace the SOL VALVE-PTU, Y (3012GL) (Ref. AMM TASK 29-23-51-000-002) and (Ref. AMM TASK 29-23-51-400-002).

 (2) If the fault continues:

 - replace the PRIORITY VALVE-Y (3064GM) (Ref. AMM TASK 29-13-33-000-001) and (Ref. AMM TASK 29-13-33-400-001).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞29-23-00∞∞∞∞∞∞∞∞∞∞Page 211
 Aug 01/05 CES

 (3) If the fault continues:

 - replace the SOL VALVE-PTU, G (1012GL) (Ref. AMM TASK 29-23-51-000-001) and (Ref. AMM TASK 29-23-51-400-001).

 (4) If the fault continues:

 - replace the PRIORITY VALVE-G (1064GM) (Ref. AMM TASK 29-11-33-000-001) and (Ref. AMM TASK 29-11-33-400-001).

 (5) If the fault continues:

 - replace the CHECK VALVE-ENG 2 PUMP DELIVERY, Y (3050GM) (Ref. AMM TASK 29-13-36-000-001) and (Ref. AMM TASK 29-13-36-400-001).
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
 A. If there is no external leakage and the pressure in the Yellow hydraulic system was less than 2100 psi during the operational test of the PTU:
 - replace the PTU-G/Y (1088GM) (Ref. AMM TASK 29-23-41-000-001) and (Ref. AMM TASK 29-23-41-400-001).
 (1) If the fault continues:

 - replace the MANIFOLD,PTU (3015GM) (Ref. AMM TASK 29-13-15-000-001) and (Ref. AMM TASK 29-13-15-400-001).

 (2) If the fault continues:

 - replace the MANIFOLD,PTU (1113GM) (Ref. AMM TASK 29-11-15-000-001) and (Ref. AMM TASK 29-11-15-400-001).

 (3) If the fault continues:

 - replace the CHECK VALVE-ENG 2 PUMP DELIVERY, Y (3050GM) (Ref. AMM TASK 29-13-36-000-001) and (Ref. AMM TASK 29-13-36-400-001).
 **ON A/C ALL
 B. Do the test as given in para. 3. to make sure that the operation is correct.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞29-23-00∞∞∞∞∞∞∞∞∞∞Page 212
 Aug 01/05 CES

 TASK 29-23-00-810-804

 Low Pressure of the Power Transfer Unit (PTU) (Yellow to Green)
 1. Possible Causes
_______________

 - PTU-G/Y (1088GM)

 - SOL VALVE-PTU, G (1012GL)

 - PRIORITY VALVE-G (1064GM)

 - SOL VALVE-PTU, Y (3012GL)

 - PRIORITY VALVE-Y (3064GM)

 - CHECK VALVE-ENG 1 PUMP DELIVERY, G (1050GM)

 - CHECK VALVE-ENG 2 PUMP DELIVERY, Y (3050GM)

 - MANIFOLD,PTU (1113GM)

 - MANIFOLD,PTU (3015GM)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R AMM 29-00-00-280-004 Check of the Internal Leakage of the Power Transfer
R Unit (PTU)
R AMM 29-10-00-220-001 Functional Check to Monitor Internal Leak Rate of
R Yellow and Green Hydraulic Systems AMM 29-11-15-000-001 Removal of the Power Transfer Unit (PTU) Manifold of the Green Hydraulic System AMM 29-11-15-400-001 Installation of the Power Transfer Unit (PTU) Manifold of the Green Hydraulic System AMM 29-11-33-000-001 Removal of the Priority Valve of the Green Hydraulic System (1064GM) AMM 29-11-33-400-001 Installation of the Priority Valve of the Green Hydraulic System (1064GM) AMM 29-11-36-000-001 Removal of the Engine 1 Green Hydraulic Pump Delivery Check Valve (1050GM). AMM 29-11-36-400-001 Installation of the Engine 1 Green Hydraulic Pump Delivery Check Valve (1050GM). AMM 29-13-15-000-001 Removal of the Power Transfer Unit (PTU) Manifold of the Yellow Hydraulic System AMM 29-13-15-400-001 Installation of the Power Transfer Unit (PTU) Manifold of the Yellow Hydraulic System AMM 29-13-33-000-001 Removal of the Priority Valve of the Yellow Hydraulic System (3064GM) AMM 29-13-33-400-001 Installation of the Priority Valve of the Yellow Hydraulic System (3064GM) AMM 29-13-36-000-001 Removal of the Engine 2 Yellow Hydraulic Pump Delivery Check Valve (3050GM). AMM 29-13-36-400-001 Installation of the Engine 2 Yellow Hydraulic Pump Delivery Check Valve (3050GM).
　
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