SERVICE BULLETIN
Nova Bus Manuals
09: Engine and Cooling
19: Driver's Accessories

REFERENCE:
SECTIONS:

BS5580E

APPLICATION DEADLINES: 2025SE01
CLAIM REFERENCE NUMBER: WB5580

RS NO:

MQR 7621-2805

EFFECTIVE IN PROD.:

N/A

SUBJECT:

Fire Suppression Piping and Alternator Cable

JUSTIFICATION:

One fire suppression system pipe may be installed backwards and interfere with an
alternator cable, creating friction that could damage one or both components.

LEVEL

DIRECT CHARGES

DESCRIPTION

LABOUR

MATERIAL

TIME

1

Inspection of the alternator positive cable and the fire suppression
pipe.

Nova Bus

–

20 min

2
3

Reorientation or replacement of the fire suppression pipe.
Repair or replacement of the alternator positive cable.

Nova Bus
Nova Bus

Nova Bus
Nova Bus

60 min
45 min

MATERIAL REQUIRED PER VEHICLE
QTY

PART NO

REV.

–

–

–

–

Pipe Assembly

DESCRIPTION

LEVEL 1

–

LEVEL 2 (only if required*)

1

N93547

LEVEL 3 (only if required*)

1 ft

N27548-17

–

Heat Shrink Tubing Blk (38.1)

1

N101828-01

–

Cable Assy C1401 4/0 AWG BK-RD

Materials will be available within 107 days once your order has been placed.
To order, contact novabus.parts@volvo.com or by phone for CANADA 1-800-771-6682, for USA 1-877-999-8808
Specify document number, quantity of parts required and shipping address.
*The material identified in Level 2 and 3 is to be ordered only for vehicles that meet the criteria defined in Level 1.

DISPOSAL OF PARTS
REMOVED PARTS ARE:

DISCARDED
*

RETAINED

Yes

–

* Dispose of the unused parts and the defective parts in
accordance with local environmental standards in effect.

REVISION HISTORY
REV.

DATE

NR

2024AL23

CHANGE DESCRIPTION

Initial release

Annie St-Jacques

APPROVED BY:
NQF772001 version 5

WRITTEN BY

PAGE 1 OF 9

Eric Charest

Signature numérique de Eric
Charest
Date : 2024.04.23 12:52:50 04'00'

SERVICE BULLETIN
ROAD NUMBER
CLIENT

ORDER

BS5580E

VIN (2NVY/4RKY...)

FROM

TO

FROM

TO

QTY

Maryland Transit Administration - MTA

LD82

21001

21070

L82J2M9777921

L82J9M9778127

70

Maryland Transit Administration - MTA

LE53

22001

22070

L82JXN9778526

L82J4N9778604

70

Maryland Transit Administration - MTA

LF46

23001

23070

L82J1P9779017

L82J5P9779117

70

PAGE 2 OF 9
NQF772001 version 5

SERVICE BULLETIN

BS5580E

WARNING

FOLLOW YOUR INTERNAL SAFETY PROCEDURES.

PROCEDURE
INSPECTION
1.1.
1.2.
1.3.
1.4.

Park the vehicle on an even surface with the transmission on neutral.
Apply the parking brake and set the master control switch to the stop position.
Set the battery disconnect switch in the battery compartment to the off position.
Inside the vehicle, lift the mid section of the rear cross seat and remove the engine access panel (Figure 1).

Figure 1 - The Mid Section of the Rear Cross Seat and the Engine Access Panel

1.5.

Locate the N93547 fire suppression pipe and the N101828-01 alternator positive cable (Figure 2).
Cable N101828-01

Pipe N93547

Figure 2 - Location of N101828-01 Cable and N93547 Pipe in the Engine Compartment

PAGE 3 OF 9
NQF772001 version 5

SERVICE BULLETIN
1.6.
1.7.

BS5580E

Inspect the orientation of the N93547 pipe, check if it is installed backwards, compare with the Figure 3 which
shows a correctly installed pipe.
If the pipe is installed backwards, inspect the pipe for any signs of wear due to rubbing with electrical cables.
Refer to the Figure 4 to identify the section of the pipe to inspect.

INTERNAL VIEW TOWARD REAR

INTERNAL VIEW TOWARD REAR

TOP VIEW

Figure 3 - Correct Orientation and Position of N93547 Fire Suppression Pipe

PAGE 4 OF 9
NQF772001 version 5

SERVICE BULLETIN
1.8.

BS5580E

Inspect the N101828-01 alternator positive cable for any signs of friction or damage (wear, tear, etc.) due to
rubbing with a pipe. Refer to the Figure 4 to identify the section of the cable to inspect.

TOP VIEW
Figure 4 - Sections of Cable and Pipe to Inspect

INSPECTION RESULTS
1.9.

According to the inspection results, perform EACH required step listed below:
•

If the pipe is installed backwards, carry out the Level 2 procedure: REORIENT N93547 FIRE
SUPPRESSION PIPE at pages 6 and 7.

•

If the pipe shows signs of wear due to friction with an electrical cable, carry out the Level 2 procedure:
REPLACE N93547 FIRE SUPPRESSION PIPE at pages 6 and 7.

•

If the electrical cable N101828-01 shows signs of wear due to friction with the fire suppression pipe N94547
and only the outer jacket is damaged and the inner wires are not visible, carry out the Level 3 procedure:
REPAIR N101828-01 POSITIVE ALTERNATOR CABLE at pages 8 and 9.

•

If the electrical cable shows signs of wear and the inner wires are visible, carry out the Level 3 procedure:
REPLACE N101828-01 POSITIVE ALTERNATOR CABLE at pages 8 and 9.

•

If the pipe orientation is correct and the electrical cable shows no signs of wear, finalize work with Level 1
procedure: CLOSING at page 9.

PAGE 5 OF 9
NQF772001 version 5

SERVICE BULLETIN

BS5580E

FIRE SUPPRESSION PIPE
DISABLE THE FIRE SUPPRESSION SYSTEM (before maintenance)
2.1.
2.2.

2.3.
2.4.

Open the tunnel access door above the rear cross seat.
To disable the Amerex Fire Suppression System, for each extinguisher, disconnect the yellow tagged cable
coming from the tank actuator and connect an Amerex Fire Alarm Test Module (Amerex p/n: 21447 or 27201)
(Figure 5). Note: one Fire Alarm Test Module is needed per extinguisher.
The Amerex Overhead Operator Display panel should show that the system is OK (Figure 6).
Press and release the Push to Reset button on each Fire Alarm Test Module. The Fire Suppression System is
now disabled and maintenance can be done. Proceed with the repair or replacement procedure at page 7.
Note: all Fire Alarm Test Modules must stay connected during maintenance.

ENABLE THE FIRE SUPPRESSION SYSTEM (after maintenance)
2.5.

2.6.
2.7.

ONLY when the maintenance on the fire suppression system is completed, the Amerex Fire Suppression
system can be enabled. Disconnect both Amerex Fire Alarm Test Module from the extinguisher yellow tagged
pigtail. Reconnect each pigtail to the vehicle harness. Secure cables with cable ties as needed.
Close the tunnel access door.
Continue with the next procedure to be performed or finalize with the CLOSING procedureat page 9.

Fire Alarm Test Module
Amerex P/N: 21447 or 27201
Figure 5 - Connect the Fire Alarm Test Modules to the Extinguishers Actuator

Figure 6 - Amerex Overhead Operator Display
PAGE 6 OF 9
NQF772001 version 5

SERVICE BULLETIN

BS5580E

REORIENTE N93547 FIRE SUPPRESSION PIPE
2.8.

Make sure to enable the fire suppression system prior to any maintenance (Page 6).

2.9.

Remove the existing fire suppression pipe N93547.

2.10.
2.11.

Reinstall the pipe correctly (Figures 3 and 7). Torque each end of the pipe and apply torque seal.
The fire suppression system can now be enabled (Page 6).

REPLACE N93547 FIRE SUPPRESSION PIPE
2.12.
2.13.
2.14.

Make sure to enable the fire suppression system prior to any maintanance (Page 6).
Remove the existing fire suppression pipe N93547. Discard.
Install the new N93547 fire suppression pipe (Figures 3 and 7). Torque each end of the pipe and apply torque
seal.

2.15.

The fire suppression system can now be enabled (Page 6).

84 ±4 lb-ft (104 ±5 N•m)
Figure 7 - N93547 Fire Suppression Pipe Installation

PAGE 7 OF 9
NQF772001 version 5

SERVICE BULLETIN

BS5580E

ALTERNATOR POSITIVE CABLE
REPAIR N101828-01 ALTERNATOR POSITIVE CABLE
3.1.
3.2.
3.3.

Make sure the battery disconnect switch is in the off position in the battery compartment.
WARNING: wait 10 minutes after the battery disconnect switch bas been placed in the off position. This will
maintain the electronic circuit's discharge path and protect the engine's electronic control module (ECM).
Disconnect all cables from the positive terminal of the batteries.

3.4.

Disconnect all cables from the negative terminal of the batteries.

Double split block
106 ±10 lb-in (12 ±1 N•m)

15 +1 lb-ft
(21 ±1 N•m)

N101828-01
Single split block
53 lb-in (6 N•m)

32 ±2 lb-ft (44 ±3 N•m)
Add NCP2
Figure 8 - N101828-01 Alternator Positive Cable Installation

PAGE 8 OF 9
NQF772001 version 5

SERVICE BULLETIN
3.5.
3.6.

BS5580E

Cut 2 lengths of heat shrink tubing N27548-17, long enough to cover the damaged section of cable, plus an
extra inch for each end.
Disconnect the alternator positive cable N101828-01 at the alternator and free the cable from the split block.
Keep all hardware for later reinstallation.

3.7.
3.8.
3.9.
3.10.

Insert first piece of heat shrink tubing onto the cable. Position over the damaged section and heat the tubing.
Install a second layer of tubing by doing the same thing with the second piece of tubing.
Reinstall the cable in the split block (Figure 8). Torque and apply torque seal.
Connect the cable to the alternator postive terminal of the alternator. Install hardware, torque (Figure 8) and
apply torque seal.

3.11.
3.12.
3.13.
3.14.

Apply NCP2 - Battery Corrosion Preventative like N67314 on cable and alternator terminals.
Use a multimeter (in manual mode, in Ω) to make sure that there is no continuity (O.L.) between the positive
cable and the chassis.
Connect all negative cables to the batteries and torque at 13 lb-ft (17 N•m).
Connect all positive cables to the batteries and torque at 13 lb-ft (17 N•m).

3.15.

Continue with the next procedure to be performed or finalize with the CLOSING procedure at page 9.

REPLACE N101828-01 ALTERNATOR POSITIVE CABLE
3.16.

Make sure the battery disconnect switch is in the off position in the battery compartment.

3.17.

WARNING: wait 10 minutes after the battery disconnect switch bas been placed in the off position. This will
maintain the electronic circuit's discharge path and protect the engine's electronic control module (ECM).
Disconnect all cables from the positive terminal of the batteries.

3.18.
3.19.
3.20.

Disconnect all cables from the negative terminal of the batteries.
Disconnect the alternator positive cable N101828-01 at both end and free the cable from block clamps. Keep
all hardware for later reinstallation. Discard the cable.

3.21.

3.24.

Connect the new N101828-01 cable to both end and install in split blocks. Use the removed hardware. Torque
(Figure 8) and apply torque seal.
Apply NCP2 - Battery Corrosion Preventative like N67314 on cable and alternator terminals.
Use a multimeter (in manual mode, in Ω) to make sure that there is no continuity (O.L.) between the positive
cable and the chassis.
Connect all negative cables to the batteries and torque at 13 lb-ft (17 N•m).

3.25.
3.26.

Connect all positive cables to the batteries and torque at 13 lb-ft (17 N•m).
Continue with the next procedure to be performed or finalize with the CLOSING procedure at page 9.

3.22.
3.23.

CLOSING
1.10.
1.11.
1.12.

Reinstall the engine access panel and close the rear cross seat mid section.
Set the battery disconnect switch to the on position.
The vehicle can return in service.

PAGE 9 OF 9
NQF772001 version 5