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TM 5-2420-222-20-3
BACKHOE CONTROL VALVE
This task covers:
a.
Removal (page 2-1260)
d.
Inspection/Replacement (page 2-1264)
b.
Disassembly (page 2-1262)
e.
Assembly (page 2-1265)
c.
Cleaning (page 2-1264)
f.
Installation (page 2-1266)
INITIAL SETUP
Tools
Materials/Parts - Continued
Handle, ratchet, 1/2-inch drive
Packing, union adapter-to-valve
Knife, pocket
(two required)
Pan, drain
Packing, union adapter-to-valve
Socket, 1/2-inch drive, 3/4-inch
(four required)
Wrench, open-end, 11/16-inch
Packing, union adapter-to-valve
Wrench, open-end, 3/4-inch
(two required)
Wrench, open-end, 7/8-inch
Rags, wiping (item 21, Appendix C)
Wrench, open-end, 15/16-inch
Solvent, dry-cleaning (item 28, Appendix C)
Wrench, open-end, 1-inch
Tags, marking (item 30, Appendix C)
(two required)
Wrench, open-end, 1 1/8-inch
Personnel Required
Wrench, open-end, 1 1/4-inch
Wrench, open-end, 1 3/4-inch
Two
Materials/Parts
Equipment Condition
Lockwasher, valve screw
1. Hydraulic system pressure released
(three required)
(page 2-1191)
Packing, adapter-to-valve
2. Backhoe control valve levers and linkage
(six required)
removed (page 2-1189)
ACTION
LOCATION
ITEM
REMARKS
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.
2-1260
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