TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
14-6
14-6
continuously low
continuously low
with no signs of
with no signs of
external leakage
external leakage
p
p
p
p
y
y
leaking.
leaking.
p
p
8.
8.
Ge
Ge
ar
ar
oi
oi
l l
l l
ev
ev
el
el
in
in
hub is continuous-
hub is continuous-
ly too high
ly too high
1.
1.
Sea
Sea
l b
l b
etw
etw
een
een
brak
brak
e h
e h
ous
ous
ing
ing
and
and
wheel hub may be leaking.
wheel hub may be leaking.
2.
2.
Coo
Coo
lin
lin
g fl
g fl
uid p
uid p
res
res
sur
sur
e is t
e is t
oo hi
oo hi
gh.
gh.
1.
1.
Re
Re
pl
pl
ac
ac
e s
e s
ea
ea
l.
l.
2.
2.
Hav
Hav
e br
e br
ake
ake
coo
coo
lan
lan
t pr
t pr
ess
ess
ure
ure
rel
rel
ief
ief
valve cartridge replaced.
valve cartridge replaced.
9.
9.
Si
Si
gn
gn
s o
s o
f e
f e
xt
xt
er
er
na
na
l
l
leakage exist
leakage exist
1.
1.
Cle
Cle
an s
an s
urf
urf
ace
ace
and
and
the
the
n de
n de
ter
ter
min
min
e
e
location of leakage.
location of leakage.
1.
1.
Re
Re
pl
pl
ac
ac
e se
e se
al
al
s
s
.
.
Section 15
Section 15
Brake Control System
Brake Control System
Introduction.
Introduction.
The brake control system controls
The brake control system controls
the slowing down and stopping of the truck.
the slowing down and stopping of the truck.
Hydraulic pressure is controlled by the foot oper-
Hydraulic pressure is controlled by the foot oper-
ated brake valves (pedals) and is sent to the
ated brake valves (pedals) and is sent to the
brake housings of the drive axle to apply the ser-
brake housings of the drive axle to apply the ser-
vice brakes.
vice brakes.
The parking
The parking
brake control
brake control
applies
applies
and releases the spring applied, drive line parking
and releases the spring applied, drive line parking
brake.
brake.
Major Components
Major Components
(Illustration 15-2)
(Illustration 15-2)
.
.
The brake
The brake
control system consists of a main pump, manifold,
control system consists of a main pump, manifold,
two accumulators, brake valves, shuttle valve,
two accumulators, brake valves, shuttle valve,
drive axle service brakes, parking brake control,
drive axle service brakes, parking brake control,
and parking brake.
and parking brake.
Refer to
Refer to
the illustrations
the illustrations
as
as
indicated for identification of parts.
indicated for identification of parts.
Manifold.
Manifold.
Refer
Refer
to
to
Section 22
Section 22
for operation of
for operation of
the manifold.
the manifold.
Accumulators
Accumulators
(Illustration 15-8)
(Illustration 15-8)
.
.
There
There
are
are
two
two
accumulators connect
accumulators connect
ed to
ed to
the main
the main
valve.
valve.
They
They
store a volume of oil at pressure for brake applica-
store a volume of oil at pressure for brake applica-
tion.
tion.
These
These
accumulators
accumulators
are
are
hydro-pneumatic
hydro-pneumatic
piston type and are precharged with dry nitrogen
piston type and are precharged with dry nitrogen
to 1,250 psi
to 1,250 psi
(86 bar) and
(86 bar) and
500 psi (35
500 psi (35
bar).
bar).
Refer
Refer
to
to
Section 22E
Section 22E
for procedures for checking the
for procedures for checking the
precharge and charging the accumulator.
precharge and charging the accumulator.
Brake Valves
Brake Valves
(Illustration 15-3)
(Illustration 15-3)
.
.
There
There
are
are
two
two
brake valves used
brake valves used
to stop the
to stop the
truck.
truck.
Both brake
Both brake
valves actuate the service brakes of the drive axle
valves actuate the service brakes of the drive axle
when either
when either
brake pedal is
brake pedal is
applied.
applied.
The LH
The LH
brake
brake
valve can independently disengage the transmis-
valve can independently disengage the transmis-
sion (inching) when the brake pedal is applied.
sion (inching) when the brake pedal is applied.
When either brake valve is applied, its P and B
When either brake valve is applied, its P and B
ports will be connected to send hydraulic pressure
ports will be connected to send hydraulic pressure
to apply
to apply
the service
the service
brakes.
brakes.
When the
When the
service
service
brakes are released, the B port is connected to
brakes are released, the B port is connected to
the T port to vent hydraulic flow back to the
the T port to vent hydraulic flow back to the
hydraulic tank.
hydraulic tank.
Inching Operation.
Inching Operation.
When the
When the
LH brake
LH brake
pedal is
pedal is
depressed the transmission
ill be disengaged
depressed the transmission
ill be disengaged
parking brake control is pulled out, the hydraulic
parking brake control is pulled out, the hydraulic
pressure is released and the parking brake is
pressure is released and the parking brake is
applied.
applied.
Illustration
Illustration
15-1.
15-1.
Parking Brake
Parking Brake
Control
Control
Parking Brake
Parking Brake
(Illustration 15-4)
(Illustration 15-4)
.
.
The
The
parking
parking
brake is spring applied and hydraulically released.
brake is spring applied and hydraulically released.
Do not attempt to remove
Do not attempt to remove
spring(s), they
spring(s), they
are not
are not
serviceable.
serviceable.
Do not
Do not
cut,
cut,
saw, torch o
saw, torch o
r modify
r modify
this chamber
this chamber
.
.
Serious
Serious
injury or death could result.
injury or death could result.
Parking Brake Linings.
Parking Brake Linings.
The
The
parking brak
parking brak
e lin-
e lin-
ings should be checked for wear periodically (refer
ings should be checked for wear periodically (refer
to the
to the
Preventive Maintenance
Preventive Maintenance
chart in the
chart in the
Appendices
Appendices
for parking brake linings wear
for parking brake linings wear
inspection).
inspection).
The parking
The parking
brake linings
brake linings
should be
should be
replaced before the brake lining friction material
replaced before the brake lining friction material
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