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 TM 9-2320-285-24-2
3-24.
BRAKE CONTROLS MAINTENANCE (CONT)
f
Ratio Reducing Valve.
This task covers:
a
Removal
d
Inspection
b
Disassembly
e
Reassembly
c
Cleaning
f
Installation
INITIAL SETUP
Tools
Personnel Required
No
1 Common Organizational Maintenance
Automotive Repairer MOS 63H
Tool Kit
Socket wrench set
Equipment Condition
Screwdriver set
Paragraph
Condition Description
Screwdriver
Scratch wire brush
Vehicle parked on level
Safety glasses
surface, engine off, and
Automotive Mechanic's Tool Kit
parking brake applied.
Pliers
Cab tilted 45 degrees.
2-41h(1)
All air pressure relieved.
Materials/Parts
2-51a
Air brake lines and fittings
Cleaning solvent
Item 1, Appendix C
removed from ratio reducing
Clean cloths
Item 2, Appendix C
valve.
Lubricant
Item 17, Appendix C
Maintenance kit
FSCM 06853 PN 289500
STEP
LOCATION
ITEM
ACTION
REMARKS
REMOVAL
1
Cab deck,
a
Two capscrews
Remove
Support valve assembly
underside
(1), nuts (2),
and lock
washers (3)
b
Valve assembly
Remove
From deck
DISASSEMBLY
2
Ratio
a
Four screws (4)
Remove
reducing
b
Cover (5)
Remove
Lift from body (15)
valve
c
Piston (6) and
Remove
Discard O-ring (7)
O-ring (7)
d
Springs (8 and
Remove
Discard springs (8 and 9)
9)
e
Piston (10),
Remove
Discard O-rings (12 and 13)
valve (11),
and valve (11)
and O-rings
(12 and 13)
f
Spring (14)
Remove
From body (15)
3-191
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