FT4929

FT4929 Curb side front wheel air brake hose rubbing
Technical writer name
Devanand
First Level Parts
Material
Part Number
-
-
QTY
Manual section
08
Nb hours Level 1
Nb hours Level 2
0.5 hr
MQR
7621-2141
1.5 hr
-
Disposal of parts
Second Level Parts (33% of 38 vehicles)
Material
Part Number
HOSE AIR BRAKE FRONT AXLE
N45827
Shop Supply (33% of 38 vehicles)
Material
Part Number
TIE TEFZEL CABLE TIES
CABLE TIE
N56339
504637
Client
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
New York City Transit New York - NYCT
Order
LA76
LC32
LC32
LC32
LC32
LC32
LC32
LC32
LC32
LC32
Removed parts are:
QTY
1
Discarded
X
Retained
-
When the retained check box is check, the parts must be retained
and returned in accordance with the usual warranty procedure to
be reimbursed,
QTY
3
6
Road numbers
8623
8633
8634
8641
8643
8643
8645
8645
8647
8654
8658
8658
8661
8664
8666
8666
8669
8669
8671
8672
VIN
L82J8K9777144
L82J5K9777134
L82JXK9777145 L82J7K9777152
L82J0K9777154
L82J0K9777154
L82J4K9777156
L82J4K9777156
L82J8K9777158
L82J5K9777165
L82J2K9777169
L82J2K9777169
L82J2K9777172
L82J8K9777175
L82J1K9777177
L82J1K9777177
L82J1K9777180
L82J1K9777180
L82J5K9777182
L82J7K9777183
QTY Lang. Customer Target market Plant Config moteur Model
E
US
TD
40
11
NYCT
PLB
8
E
US
TD
40
NYCT
PLB
1
E
US
TD
40
NYCT
PLB
1
E
US
TD
40
NYCT
PLB
8
E
US
TD
40
NYCT
PLB
1
E
US
TD
40
NYCT
PLB
4
E
US
TD
40
NYCT
PLB
1
E
US
TD
40
NYCT
PLB
1
E
US
TD
40
NYCT
PLB
2
E
US
TD
40
NYCT
PLB
Jean-Nicolas Fournier
NR
x
x
x
x
x
x
x
x
x
x
R1
Digitally signed by Jean-Nicolas Fournier
DN: cn=Jean-Nicolas Fournier, o=Nova Bus,
[email protected], c=CA
Date: 2020.08.21 11:05:59 -04'00'
Brake hose internal campaign
C/S and S/S front brake hoses
NYCT LC32
Tools/parts required if replacement of
hose is necessary
•
•
•
•
•
•
•
•
•
Wheel chocks/jack stands
Lock-out/Tag-out
Torque wrench
7/8” crows foot
Ratchet with 10mm socket
10mm wrench
Brake hose N45827
Blue zip ties N56339, X3
Black zip tie G5007995, X6
Brake hose rubbing tire
Root Cause
• While tightening the brake hose at the C/S
front brake chamber some buses have had the
brake line twist toward the front tire during
the torqueing process, this is not present on
the street side, this hose when torqued moves
away from the tire due to it being the
opposite direction as the curb side.
A 30mm minimum of clearance is
required between brake hose and tire
Lock bus out
• Place jack stands at yellow jacking points at
the front of the bus, once complete, it is safe
to measure inside the C/S and S/S wheel well.
• Measure distance between brake hose and
tire, turning the wheel to the right will make it
easier if the bus is on the ground or it can be
done with the wheels straight if the bus is in
the air or over a pit.
Measure distance between brake hose
and tire at its closest point
If there is less than 30MM and no contact between the brake
hose and tire has been made, conduct the following procedure,
keep bus locked out/chocked/stands in place
Cut 2 blue zip
ties, be sure to
not cut into
brake hose
Loosen “P” Clamp
With “P” Clamp loose, gently slide the hose
toward the back of the bus until a minimum
of 30mm is reached between the tire/brake
hose. Re-tighten “P” clamp and re-install
blue tie-wraps as originally oriented.
Check connection at brake chamber
• Verify the hose is not kinked/stressed where
the fitting is crimped onto the hose at the
brake chamber.
If contact has been made:
• The brake hose must be replaced.
• The repair can be done with the bus on the
ground with the wheel turned all the way to
the right, over a pit, or on a lift. Follow all local
safety procedures.
Empty primary and secondary air
tanks, red and green shown below
Remove zip ties from brake hose for
ABS and brake wear sensor
• Be cautious when cutting, do not cut into
cables
Remove “P” clamps from brake hose
X3
Disconnect air hose and discard
Install new air hose into “P” clamps,
follow routing shown below
34-38Nm
Air hose installation continued
Air hose installation continued
• SAE 37° JIC flare fitting assembly instructions
• 6.1.1 Inspect the contact surface and threads
for any damage or material flaw.
• (Do not apply sealer on threads.)
Air hose installation continued
• Use thread size to determine torque to be applied (see
Table 5).
• 6.1.4 Screw in the adapter or fitting by hand to ensure
threads are correctly engaged
• and finger tighten as much as possible.
• 6.1.5 Using a wrench, complete tightening to the
recommended torque (see Table 5).
• 6.1.6 Apply anti-tamper seal (“Torque Seal”) to indicate
torque has been applied (AVT-0203).
Re-secure cables
Re-secure cables on brake hose
N56339
Continued from previous slide
G5007994
X6
Measure brake hose to tire
• Be sure the 30MM requirement is met.
• If not, adjust hose as shown on previous slides
Remove jack stands and unlock bus
• Run bus until governor cut-out (approx
135PSI)
• Turn steering wheel lock to lock several times.
• Kneel bus and bring back to ride height.
• With bus running and qualified personnel in
the driver seat, release parking brake and
depress brake pedal to the floor, have a helper
check for leaks at the brake hose connections
with snoop or soapy water, watch for bubbles.
Leak check
• If no leaks are present, the bus can be
released
• If leaks are detected, the connections must be
disassembled, checked for damage and retorqued to 34-38NM, do not over-torque.