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TM 5-2420-222-20-3
BACKHOE CONTROL VALVE-TO-MANIFOLD BLOCK OIL LINES
This task covers:
a.
Removal (page 2-1558)
c.
Inspection/Replacement (page 2-1560)
b.
Cleaning (page 2-1560)
d.
Installation (page 2-1561)
INITIAL SETUP
Tools
Materials/Parts
Extension, 1/2-inch drive,
Packing, union adapter (six required)
10-inch
Rags, wiping (item 21, Appendix C)
Handle, ratchet, 1/2-inch drive
Solvent, drycleaning (item 28, Appendix C)
Knife, pocket
Tags, marking (item 30, Appendix C)
Pan, drain
Socket, deep, 1/2-inch drive, 1-inch
Personnel Required
Wrench, open-end, 11/16-inch
Wrench, open-end, 3/4-inch
One
Wrench, open-end, 718-inch
Wrench, open-end, 15/16-inch
Equipment Condition
Wrench, open-end, 1-inch
1.
Backhoe valve box cover removed
Materials/Parts
(page 2-1157)
2.
Hydraulic system pressure released
Detergent, GP (item 7, Appendix C)
(page 2-1191)
Packing, straight adapter
(six required)
ACTION
LOCATION
ITEM
REMARKS
NOTE
All six backhoe control valve-to-manifold block oil lines are maintained in same
way except as noted. One is shown. Repeat procedures as needed for other five
lines. It may be necessary to remove one line to gain access to other lines.
REMOVAL
WARNING
Do not attempt to 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. Hydraulic system pressure should be 0 psi (0
kPa) before lines are disconnected. A line or fitting disconnected under pressure
will blow off with a lot of force and could cause serious injury to personnel.
Be careful when draining hot fluids. Wear gloves to protect your hands from hot
parts and fluids or severe burns could result.
2-1558
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