TM-9-2320-285-24-2
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1985
TM-9-2320-285-24-2 - Page 172 of 698
TM 9-2320-285-24-2
3-23.
TREADLE VALVE MAINTENANCE (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
INSPECTION (cont)
7
b.
Valve body (16)
Inspect
Replace entire brake treadle
(cont)
valve assembly if valve
body (16) is cracked,
broken, excessively worn,
or bores or threads damaged
c.
Piston (19) and
Inspect
Replace if cracked, broken,
valve (31)
or scored
d.
Piston return
Inspect
Replace if cracked, broken,
spring (20),
or permanently set
preload
spring (30),
and spring
(32)
e.
Diaphragm (29)
Inspect
Replace if cracked, broken,
inflexible, or deteriorated
f.
All other parts
Inspect
Replace if cracked, broken,
distorted, or threads
damaged
REASSEMBLY
NOTE
Lightly coat piston (19), new O-rings (21, 26, and 33), and bores in valve body (16) with pneumatic grease
before reassembly.
8
Valve
Piston (19), new
Lubricate
Use pneumatic grease
body
O-rings (21, 26,
(16)
and 33), and
bores in valve
body (16)
9
Valve
a.
Preload spring
Position
In seat (35)
insert
(30)
assembly
b.
Diaphragm (29)
Install
(items 26
thru 35)
NOTE
In following step, washer (28) must be installed with lips pointing out.
c.
Washer (28)
Install
d.
Screw (27)
Install
Tighten securely
3-166
Back to Top
