Removal of the Yellow Engine Pump

TASK 29-13-51-000-004-A
Removal of the Yellow Engine Pump

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

CAUTION: DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

ZONE: 400
FIN: 3030GD ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
195BB, 198CB
FOR [1000EM2] (ENGINE-2)
447AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 29-00-00-280-005-A	Check of the Green, Yellow or Blue Hydraulic System after Operation in an Overheat Condition
TASK 29-00-00-280-006-A	Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition - with Ground Cart Available
TASK 29-00-00-280-006-A-01	Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition - Ground Cart not Available
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-24-00-864-001-A	Depressurize the Yellow Hydraulic System
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
Yellow Engine Pump (Vickers)
Yellow Engine Pump (Abex)

3. Job Set-up
Subtask 29-13-51-861-051-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 29-13-51-860-055-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Do the system check applicable after pump damage (Ref. AMM TASK 29-00-00-280-006), if you remove the pump:

because of operation without fluid (dry running)
or because of malfunction if you think that there is a pump internal damage. If there is a pump damage and an overheat condition, do also the system check applicable after overheat condition (Ref. AMM TASK 29-00-00-280-005).

(2) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-00-864-001).
(3) Depressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(4) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

on the ground service panel 198CB.

(5) Put a WARNING NOTICE(S) in position on the access door 195BB to tell persons not to pressurize the Yellow hydraulic reservoir.
(6) On the ECAM control panel, push the HYD key:

On the SD, the HYD page comes into view.

(7) On the overhead panel 20VU:

Lift the guard and release the ENG2/FIRE pushbutton switch.

(8) On the SD:

Make sure that the fire shut-off valve (3046GD) is closed.

Subtask 29-13-51-941-054-A ** ON A/C NOT FOR ALL

C. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:

Put a WARNING NOTICE(S) in position to tell persons not to start the engine.

(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

In the cockpit, on the HYD section of panel 40VU.

(4) On maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).

(5) Put a CONTAINER 5 L (1.32 USGAL) below the Yellow engine pump to collect the remaining fluid.
(6) Do a visual check of the related Yellow HP-filter element (3048GM):

If you find metal chips or hydraulic fluid in decomposition (jelly) in the filter element, flush the lines that connect the pump to the filters.
If you find contamination in the filters, flush the lines that connect the pump to the filters.

Subtask 29-13-51-010-052-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the left fan cowl door (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM2] (ENGINE-2)
Open the door 447AL.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

Subtask 29-13-51-865-056-A ** ON A/C NOT FOR ALL

E. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36

4. Procedure
Subtask 29-13-51-020-052-A ** ON A/C NOT FOR ALL

A. Removal of the Yellow Engine Pump Vickers
(1) Disconnect the electrical connector (3030GDA) from the pump (35).
(2) Disconnect the case drain hose (20) from the union/reducer (25) on the pump (35).
(a) Use a second wrench to hold the union/reducer (25) on the pump (35) when you loosen the hose coupling nut.
(3) Remove the union/reducer (25) and the packing (30) from the case drain port of the pump (35) and discard the packing (30).
(4) Disconnect the suction hose/tube (10) from the adapter (70) on the pump (35).
(a) Use a second wrench to hold the adapter (70) on the pump (35) when you loosen the hose/tube coupling nut.
(5) Disconnect the adapter (70) from the union (15) on the pump (35).
(a) Use a second wrench to hold the union (15) on the pump (35) when you loosen the adapter coupling nut.
(6) Visual inspection of the adapter (70):
(a) Make sure that the valve is correctly aligned with the adapter body.
(b) Make sure that there is no leak.
(c) Replace if necessary.
(7) Remove the union (15) and the packing (55) from the suction port of the pump (35) and discard the packing (55).
(8) Disconnect the pressure hose/tube (5) from the union/reducer (65) on the pump (35).
(a) Use a second wrench to hold the union/reducer (65) on the pump (35) when you loosen the hose/tube coupling nut.
(9) Remove the union/reducer (65), packing (60) and back-up ring (63) from the pressure port on the pump (35). Discard the packing (60) and the back-up ring (63).
(10) Remove the pump (35) as follows:
(a) Loosen the four mount nuts (50).
(b) Turn the pump (35) in a clockwise direction until the nut goes through the large part of the hole in the pump flange.
(c) Move the pump (35) forward and remove it from the engine.
(d) Remove and discard the nuts (50).
(11) Remove and discard the gasket (45) from the mount pad.
(12) Remove the packing (40) from the pump input splined-shaft and discard the packing (40).
(13) Put COVER - PROTECTION on the end of the hose/tube assemblies, unions (15), unions/reducers (25) and (65), pump (35) and electrical connector.
(14) Put PLUG - BLANKING on the open end of the pump and on the gearbox mount pad.

Subtask 29-13-51-020-058-A ** ON A/C NOT FOR ALL

B. Removal of the Yellow Engine Pump Abex
(1) Disconnect the electrical connector (3030GDA) from the pump (35).
(2) Disconnect the case drain hose (20) from the union/reducer (25) on the pump (35).
(a) Use a second wrench to hold the union/reducer (25) on the pump (35) when you loosen the hose coupling nut.
(3) Remove the union/reducer (25) and the packing (30) from the case drain port of the pump (35) and discard the packing (30).
(4) Disconnect the suction hose/tube (10) from the adapter (70) on the pump (35).
(a) Use a second wrench to hold the adapter (70) on the pump (35) when you loosen the hose/tube coupling nut.
(5) Disconnect the adapter (70) from the union (15) on the pump (35).
(a) Use a second wrench to hold the union (15) on the pump (35) when you loosen the adapter coupling nut.
(6) Visual inspection of the adapter (70):
(a) Make sure that the valve is correctly aligned with the adapter body.
(b) Make sure that there is no leak.
(c) Replace if necessary.
(7) Remove the union (15) and the packing (55) from the suction port of the pump (35) and discard the packing (55).
(8) Disconnect the pressure hose/tube (5) from the union/reducer (65) on the pump (35).
(a) Use a second wrench to hold the union/reducer (65) on the pump (35) when you loosen the hose/tube coupling nut.
(9) Remove the union/reducer (65), the packing (60) and the back-up ring (63) from the pressure port on the pump (35). Discard the packing (60) and the back-up ring (63).
(10) Remove the pump (35) as follows:
(a) Loosen the four mount nuts (50).
(b) Turn the pump (35) in a clockwise direction until the nut goes through the large part of the hole in the pump flange.
(c) Move the pump (35) forward and remove it from the engine.
(d) Remove and discard the nuts (50).
(11) Remove and discard the gasket (45) from the mount pad.
(12) Remove the packing (40) from the pump input splined-shaft and discard the packing (40).
(13) Put COVER - PROTECTION on the end of the hose/tube assemblies, unions (15), unions/reducers (25) and (65), pump (35) and electrical connector.
(14) Put PLUG - BLANKING on the open end of the engine pump and on the gearbox mount pad.

[Rev.10 from 2021] 2026.04.01 07:52:32 UTC