Removal of the Yellow Engine Pump

TASK 29-13-51-000-003-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	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - 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, 195CB
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-A	Opening of the Fan Cowl Doors
Yellow Engine Pump (Vickers)
Yellow Engine Pump (Abex)

3. Job Set-up
Subtask 29-13-51-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 29-13-51-860-052-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 195CB.

(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 29-13-51-941-052-A ** ON A/C NOT FOR ALL

C. Safety Precautions
(1) On the center pedestal, on the 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 5 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 the panel 40VU.

(4) On the 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 element of the Yellow engine 2 pump case drain filter (3084GM), if you remove the pump:

because of operation without fluid (dry running)
or because of malfunction if you think that there is internal damage.

(7) Do also a visual check of the related Yellow HP filter element (3048GM):

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

Subtask 29-13-51-010-051-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 29-13-51-865-053-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 29-13-51-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Yellow Engine Pump Vickers
(1) Disconnect the electrical connector (3030GDA).
(2) Put a CAP - BLANKING on the electrical connector (3030GDA).
(3) Disconnect the three hoses (case drain, suction and pressure hoses).
(4) Disconnect the adapter (70) from the union (10) on the pump (5).
(a) Use a second wrench to hold the union (10) on the pump (5) when you loosen the adapter (70).
(5) Put COVER - BLANKING on the disconnected hose coupling, the pump unions (10), (15) and the reducer (20).
(6) Slightly loosen the pump unions (10), (15) and the reducer (20).
(7) Loosen the four mount nuts (25).
(8) Rotate the pump (5) clockwise to position the enlarged portions of the pump mount holes into line with the nuts. Remove the pump (5) from the gearbox.

NOTE: The pump weighs approximately 12 kg (26.45 lb).

(9) Remove and discard the packing (50) from the pump shaft.
(10) Remove and discard the nuts (25).
(11) Remove and discard the gasket (30) from the mount pad.
(12) Remove the union (10) from the pump (5) suction port.
(13) Remove and discard the packing (40).
(14) Put blanking covers on the pump (5) suction port and the union (10) port.
(15) Remove the union (15) from the pump (5) case drain port.
(16) Remove and discard the packing (45).
(17) Put blanking covers on the pump (5) case drain port and the union (15) port.
(18) Remove the reducer (20) from the pump (5) pressure port.
(19) Remove and discard the back-up ring (35) and the packing (55).
(20) Put blanking covers on the pump (5) pressure port and the reducer (20) port.

Subtask 29-13-51-020-057-A ** ON A/C NOT FOR ALL

B. Removal of the Yellow Engine Pump Abex
(1) Disconnect the electrical connector (3030GDA).
(2) Put a CAP - BLANKING on the electrical connector (3030GDA).
(3) Disconnect the three hoses (case drain, suction and pressure hoses).
(4) Disconnect the adapter (70) from the union (10) on the pump (5).
(a) Use a second wrench to hold the union (10) on the pump (5) when you loosen the adapter (70).
(5) Put COVER - BLANKING on the disconnected hose coupling, the pump unions (10), (15) and the reducer (20).
(6) Slightly loosen the pump unions (10), (15) and the reducer (20).
(7) Loosen the four mount nuts (25).
(8) Rotate the pump (5) clockwise to position the enlarged portions of the pump mount holes into line with the nuts. Remove the pump (5) from the gearbox.

NOTE: The pump weighs approximately 12 kg (26.45 lb).

[Rev.10 from 2021] 2026.04.01 00:23:26 UTC