SB2039A

SERVICE BULLETIN
SB2039A
ADDRESSEES
: Owners and operators
ABC Customer Care and Parts Source
VEHICLE MODEL
: All coaches
MANUAL CHAPTER
: 13.13 Compressed-air system – Valves
BULLETIN TYPE
: Service information
DATE
: November 19th, 2021
SUBJECT
: Introduction of new 4/2 solenoid valve in
compressed-air circuit
TERMS & CONDITIONS
: This document does not entitle to any reimbursement
INTRODUCTION:
Van Hool has switched over into production to a new type of 4/2 solenoid valve in the
compressed-air system. As the previous Knorr-Bremse (Bosch) solenoid valve
(VH11102170) is no longer made available as spare part, you will receive a Wabco
solenoid valve (VH660526759) when ordering. Both valves are interchangeable, but some
differences must be considered. Consult the information in this service bulletin for a proper
installation.
NO LONGER
AVAILABLE
Figure 1: Knorr-Bremse 4/2 solenoid
valve (VH11102170)
Figure 2: Wabco 4/2 solenoid valve
(VH660526759)
)
WHAT ARE THE DIFFERENCES?

Location of exhaust port with respect to the mounting stud is different. In case of an
installation on a grid, the existing mounting bracket VH10736435 must be replaced by
mounting bracket VH11692163. If the valve is installed on a mounting slat, an
additional 13/16 inch hole must be drilled in the slat so that the muffler of the exhaust
port can pass.
Continued on next page.
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10736435

11692163
Figure 3: Mounting brackets (in
case of a grid installation)
Ports are identical in size, but the distance between the hole centers is smaller. This
makes that the installation of two pressure switches next to each other is impossible
due to interference. Remedy this issue by making a connection between the pressure
switch and the valve by using the parts from table 1.
Table 1: Parts for connecting pressure switch to valve to prevent interference
between pressure switches
VH reference
Denomination
Number in figure
10748034
Fitting (for valve side)
1
10750002
Fitting (for pressure switch side)
4
10748052
Elbow fitting (if necessary)
3
11559129-0100
Plastic compressed-air line (length: 4 inch)
2
Figure 4
Continued on next page.
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
Location and numbering (see table 2) of the ports are different. This means that the
compressed-air lines mostly need to be extended. Refer to table 3 for possible
compressed-air line extension parts.
Table 2: Ports numbering
Port … on
corresponds with port …
Knorr-Bremse valve ..
on Wabco valve
1 (top)
11
1 (bottom)
12
21 (top)
21 (bottom)
21 (side)
21
24
5
22 (top)
22 (bottom)
22
23
3
3
Figure 5: Ports numbering
on Wabco valve
Table 3: Parts for compressed-air line extension (only if necessary)
Plastic compressed-air line (color: black)
Raufoss-fitting
Diameter
VH-reference for 50 cm (20 inch)
Housing
Nipple
6
11559128-0500
11301120
11301067
8
11559129-0500
11301120
11301068
¼”
660516004-0500
11301120
11410266
Figure 6
*To extend a compressed-air line: two housings and 4 nipples are needed
Continued on next page.
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
For installations in the front entrance: to improve the alignment of the rubber of the new
valve with respect to the panel opening, cut a piece of the bracket as illustrated in
figure 8.
BEFORE
Figure 7
AFTER
Figure 8
PNEUMATICS
A. General safety rules and installation recommendations
To avoid personal injury when working on or around the air system and its
components, the following precautions should be taken:
 If lines need to be disconnected, make sure to completely de-pressurize the system
affected.
 Unless you are certain that all system air pressure has been vented, never connect
or disconnect a pressurized line. It may whip, as air escapes. Also, never remove a
component or open a line unless you are certain that all system air pressure has
been vented.
 Switch off all systems and turn off the battery master switch.
CAUTION!
Avoid deformation of the air lines. Adjust them to the correct length!
B. Raufoss fitting installation: to enter nipple into fitting housing
CAUTION!
Never force the nipple into the housing with an obviously angled position.
Enter the nipple in a straight position in the housing during press-in operation. Push
the nipple far enough into the housing until you hear two ‘clicks’.
Continued on next page.
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C. Raufoss fitting installation: to connect air line to nipple
CAUTION!
Never insert a damaged or dirty tube end into the fitting!
Cut the air line at 90°. A maximum deviation of 10° is allowed. Secure the air line
cutting process to avoid scratches, burrs, ovality or dirt.
Step
1
Action
Insert the air line into the fitting by pushing and turning it simultaneously.
Figure 9
2
Push the air line far enough until it has passed the main seal O-ring into the
fitting to avoid slipping out. The connection is sealed now.
Figure
10
If the air line is not fully assembled, a local slot in the blue cone element will
give space for a displacement of the environmental seal O-ring. When
pressurized this will give a clear whistle sound. The air line can be repushed under pressure. When the whistle sound is gone, the air line is fully
assembled.
Figure 11: Local slot in the blue cone
element
Continued on next page.
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DISCLAIMER:
The procedures contained herein are not exclusive. Van Hool cannot possibly know,
evaluate, or advise the transportation industry of all conceivable ways in which a
procedure may be undertaken or of the possible consequences of each such procedure.
Other procedures may be as good, or better, depending upon the particular circumstances
involved. Each carrier who uses the procedures herein must first satisfy itself thoroughly
that neither the safety of its employees or agents, nor the safety or usefulness of any
products, will be jeopardized by any procedure selected.
INFORMATION HANDLING:
Important additions and modifications regarding technical information not yet included in
the manual will be communicated through Service Bulletin.
VAN HOOL CUSTOMER PORTAL:
Consult the customer portal regularly for the latest service documentation. In addition to
the maintenance manual, you will also find the operating manual and the spare parts
catalogue of your vehicle on the customer portal. The customer portal is accessible
through www.vanhool.be, but only with a code (password) from Van Hool. If you do not
have a password yet, request it by using the link on the Van Hool website.
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