(3
(3
) Con
) Con
ne
ne
ct th
ct th
e bra
e bra
ke oi
ke oi
l pi
l pi
pe wi
pe wi
th t
th t
he 2
he 2
-M
-M
10
10
1 th
1 th
re
re
ad at o
ad at o
il ou
il ou
tl
tl
et of m
et of m
ai
ai
n
n
cylinder of brake. The tightening moment is 12N.m-16N.m.
cylinder of brake. The tightening moment is 12N.m-16N.m.
(4) Open the screwed cover of liquid storage
(4) Open the screwed cover of liquid storage
tank, fill in the brake liquid (the
tank, fill in the brake liquid (the
dust or
dust or
impurit
impurit
ies are not allowed to enter) and drain off the
ies are not allowed to enter) and drain off the
air inside the entire braking system.
air inside the entire braking system.
(5) When the main cylinder of brake or vacuum booster is independently changed,
(5) When the main cylinder of brake or vacuum booster is independently changed,
the tightenin
the tightenin
g moment of the connecting nut between the two is 12
g moment of the connecting nut between the two is 12
N.m-18N.m.
N.m-18N.m.
(6) Please do not easily adjust the vacuum booster and push-rod head of main brake
(6) Please do not easily adjust the vacuum booster and push-rod head of main brake
cylinder matching surface.
cylinder matching surface.
5.3.3 Points of attention for users
5.3.3 Points of attention for users
(1) The product must use the
(1) The product must use the
braking liquid stipul
braking liquid stipul
ated in the instruction.
ated in the instruction.
(2) The air in the pipes must be drained completely after the
(2) The air in the pipes must be drained completely after the
assembly is added with
assembly is added with
braking liquid.
braking liquid.
(3) Observe if the liquid level of storage tank is in
(3) Observe if the liquid level of storage tank is in
the middle position afte
the middle position afte
r exhaust.
r exhaust.
(4) The troubles listed in Table 5.3 must be repaired by the professional personnel
(4) The troubles listed in Table 5.3 must be repaired by the professional personnel
with qualification and the users are not allowed to dismantle it without authorization.
with qualification and the users are not allowed to dismantle it without authorization.
5.3.4 Trouble shooting and cause analysi
5.3.4 Trouble shooting and cause analysi
s (See Table 5.3)
s (See Table 5.3)
5.4 Travel brake
5.4 Travel brake
Travel brake is an internal expanding and shoe brake. There is one symmetrically
Travel brake is an internal expanding and shoe brake. There is one symmetrically
on
on
the left and right each, which
the left and right each, which
are mounted respectively in the two driving wheels. Brake
are mounted respectively in the two driving wheels. Brake
is
is
composed of a pair of braking shoes (one primary and one secondary), brake sub-pump
composed of a pair of braking shoes (one primary and one secondary), brake sub-pump
(one for 5-7t
(one for 5-7t
truck and two
truck and two
for 8-10t truck), a
for 8-10t truck), a
clear
clear
ance adjust
ance adjust
er, three or
er, three or
four return
four return
springs and bottom plate of brake. A friction disc is riveted on the outside of braking shoe.
springs and bottom plate of brake. A friction disc is riveted on the outside of braking shoe.
Clearance adjuster is used to adjust the clearance between friction disc of braking shoe
Clearance adjuster is used to adjust the clearance between friction disc of braking shoe
No oil pressure set up in two cavities or in
No oil pressure set up in two cavities or in
one of them of the main cylinder
one of them of the main cylinder
, which is
, which is
reflected by: Pedal stroke becomes bigger
reflected by: Pedal stroke becomes bigger
The output oil pressure is not big and
The output oil pressure is not big and
pedal force becomes heavy.
pedal force becomes heavy.
The oil storage tank often lacks oil.
The oil storage tank often lacks oil.
The brake pedal is low and soft.
The brake pedal is low and soft.
Trouble and phenomenon
Trouble and phenomenon
1. The leather ring of main cylinder wears.
1. The leather ring of main cylinder wears.
2. The oil outlet pipe is damaged.
2. The oil outlet pipe is damaged.
1. The vacuum of booster leaks.
1. The vacuum of booster leaks.
2. The vacuum pipe of engine leaks
2. The vacuum pipe of engine leaks
1. The joint at oil
1. The joint at oil
cylinder leak
cylinder leak
s.
s.
2. The leather ring of the first piston wea
2. The leather ring of the first piston wea
rs.
rs.
1. There is air in the oil circuit system
1. There is air in the oil circuit system
2. The clearance between push rod of
2. The clearance between push rod of
booster and piston of main cylinder is too
booster and piston of main cylinder is too
big.
big.
Analysis
Analysis
-70-
-70-
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