TM 9-2330-390-14&P
4-109. HYDRAULIC LINES REPLACEMENT
This Task Covers:
a.
Hydraulic Reservoir Outlet-to-Hydraulic Pump
d.
Hydraulic Control Valve-to-Hydraulic Lift Cylinder
Inlet Hose Assembly Replacement
Hose Assemblies Replacement
b.
Hydraulic Pump Outlet-to-Hydraulic Control e.
Hydraulic Control Valve-to-Hydraulic Positioning
Valve Inlet Hose Assembly Replacement
Cylinder Hose Assemblies Replacement
C.
Hydraulic Control Valve Outlet-to-Hydraulic
Reservoir Inlet Hose Assemblies Replacement
initial Setup:
Equipment Conditions:
• Dolly set lowered (see paragraph 2-8).
• Engine starter switch set to OFF position (see
paragraph 2-20).
Tools/Test Equipment:
Materials/Parts:
• Hydraulic fluid (Item 15, Appendix F)
• Rags (Item 25, Appendix F)
• Marker tags (Item 28, Appendix F)
• Masking tape, 2 in. (Item 32, Appendix F)
• Locknuts
• General mechanic’s tool kit (Item 30, Appendix G)
• Tie-down straps
• DO NOT disconnect hydraulic lines and fittings while engine Is running or before
hydraulic system pressure has been released. When engine Is running, hydraulic
system Is under pressure. Dolly set must be fully lowered to the ground and engine
must be shut down before lines and fittings are disconnected. A line or fitting
disconnected under pressure will explode with great force and cause serious Injury
or death to personnel.
• Escaping hydraulic fluid under pressure can penetrate the skin, causing serious
Injury to personnel. Relieve pressure before disconnecting hydraulic lines and
fittings. Tighten all connections before applying pressure. Keep hands and body
away from pinholes and nozzles which eject hydraulic fluid under high pressure. Use
a piece of cardboard or paper to search for leaks. If any hydraulic fluid Is Injected
Into the skin, it MUST be surgically removed within a few hours by a doctor familiar
with this type of Injury or gangrene may result.
DO NOT allow dirt or dust to enter hydraulic reservoir. Damage to hydraulic system will
result.
NOTE
• Hydraulic lines should be tagged before removal. Refer to paragraph 4-18 for
tagging Instructions.
• Hydraulic reservoir, hydraulic pump, hydraulic control valve, and hydraulic cylinders
ports should be plugged with masking tape or other suitable means as lines are
disconnected or fittings are removed. Refer to paragraph 4-22 for Instructions.
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