TM 9-2330-390-14&P
4-274
4-108. HYDRAULIC CONTROL VALVE REPLACEMENT.
This Task Covers:
a.
Removal (Front Dolly)
b.
Removal (Rear Dolly)
c.
Cleaning and Inspection
d.
Installation (Rear Dolly)
e.
Installation (Front Dolly)
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:
• General mechanic's tool kit (item 30, Appendix G)
• Machinist's vise (Item 36, Appendix G)
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)
• Tie-down straps
• Three lockwashers
• Eleven preformed packings (rear dolly)
• Thirteen preformed packings (front dolly)
WARNING
•
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 discon-
nected. 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 seri-
ous 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.
NOTE
•
Hydraulic lines should be tagged before removal. Refer to paragraph 4-18 for
tagging instructions.
•
Hydraulic control valve ports should be plugged with masking tape or other
suitable means as lines are disconnected or fittings are removed. Refer to para-
graph 4-22 for instructions.
