TM 9-4940-568-34
3-155
3-45. BOOM LIFT HOLDING VALVE REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INITIAL SETUP
Tools
Tool Kit, General Mechanic’s
(Item 67, Appendix F)
Materials/Parts
Lubricating oil (Item 16, Appendix B)
Backup ring (Item 1, Appendix E)
Packing, preformed (Item 103, Appendix E)
Packing, preformed (Item 101, Appendix E)
Packing, preformed (Item 100, Appendix E)
Retainer, packing (Item 102, Appendix E)
Cap and plug set (Item 6, Appendix F)
Drain Pan (Item 42, Appendix F)
Equipment Condition
FRS unloaded, (TM 9-4940-568-10).
Crane unstowed (TM 9-4940-568-10).
General Safety Instructions
To avoid personal injury, always assume
hydraulic lines have pressure. Slowly crack
hydraulic lines open to allow all pressure to
escape. Always wear safety glasses.
Special Environmental Conditions
Cleanliness is extremely important when
working on hydraulic equipment. Clean all
parts before disassembly and work in a clean
area.
a.
Removal
NOTE
Cap and plug all hoses and
fittings upon removal.
(1) Raise boom (1) and turn turntable (2) on
crane (3) approximately 45 or until
boom (1) clears manifold bracket (4) for
holding valve manifold (5).
(2) Remove holding valve (6) from holding
valve manifold (5).
NOTE
Note position of backup rings
and preformed packing prior to
removal.
(3) Remove two backup rings (7), packing
retainer (8), and three preformed
packings (9, 10 and 11) from holding
valve (6). Discard preformed packings,
packing retainer and backup rings.
6
5
7
10
1
2
3
4
9
8
11
