Instruction Sheet

IS-18025

H3 SERIES I-BEAM FRONT AXLE LEVEL SENSOR REPLACEMENT

Description:
This instruction sheet shows how to replace kneeling level sensor #21643575 by sensor #22194741.

APPLICATION
Model

VIN

H3-45 coaches
Model Year : 2012 - 2014

From 2PCH33499CC712007 up to 2PCH33498EC712504 incl.

MATERIAL
Order kit # 132117 that contains the following parts:
Part No.
22194741

Description

Qty

SENSOR

1

132123

C-SHAPE ADAPTOR

1

132121

SENSOR ARM ASSEMBLY

1

5001745

SCR CAP HEX N500 M8X25 G8.8

4

502851

NUT HEX N500 M8-1.25

5

500321

WSH BEL SPR N500 .331X.827X.098(M8,5/16)

5

5001736

WSH FL N500 8.4X18X2 (M8,5/16)

2

IS-18025

INSTRUCTION SHEET

1

FI-18025

FEUILLE D’INSTRUCTIONS

1

NOTE
Material can be obtained through regular channels.

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PROCEDURE

DANGER
Park vehicle safely, apply parking brake, stop the engine. Prior to working on the vehicle, set the
ignition switch to the OFF position and trip the main circuit breakers equipped with a trip button. On
Commuter type vehicles, set the battery master switch (master cut-out) to the OFF position.

EXISTING ARM AND LEVEL SENSOR REMOVAL
1. Raise the vehicle with safe lifting equipment
and procedures.
2. Remove cable ties that support the sensor
wiring.
3. Unscrew the sensor connector cap and
disconnect the wiring.

FIGURE 1

4. Disconnect the top of the valve connecting
rod with the valve lever.
5. Keep fasteners for reinstallation.

FIGURE 2

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6. Dismount the existing sensor arm from the
existing sensor and from the valve lever.
7. Discard the arm and the fasteners.

FIGURE 3

8. Dismount sensor (2 screws).
9. Discard sensor and fasteners.

FIGURE 4

10. Remove rust on the valve lever, clean it and
apply liquid lubricant. Do these operations on
four faces and only half of the lever
(connecting rod side).

FIGURE 5

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11. Remove rust on the sensor bracket mounting
faces and clean it.

FIGURE 6

NEW ARM AND LEVEL SENSOR INSTALLATION
12. Assemble the sensor with the ‘’C-shape’’
support.

NOTE
Never alter the sensor for any reason.
Make sure the flat on the sensor rotor is
orientated as shown in Figure 7.

NOTE
Screw head must be inside the ‘’C-shape’’
support.
Install flat washers with the screw head side
and Belleville washers on the nut side.

FIGURE 7

13. The ‘’C-shape’’ support has arced slots to
allow angle adjustment of the sensor.
Orientate the sensor with the screws in the
middle of the arced slots and tighten.

FIGURE 8

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14. Install the ‘’C-shape’’ support with the sensor
on the vehicle structural bracket.
15. Tighten the nuts.

NOTE
Screw head must be inside the ‘’C-shape’’
support.
Install Belleville washers on the nut side.

FIGURE 9

16. Install the sensor arm slider on the valve
lever.
17. Reinstall the connecting rod on the valve
lever.

FIGURE 10

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18. Install new arm on the sensor. Use Belleville
washer and tighten the nut.

FIGURE 11

19. Connect existing wiring to sensor and screw
the sensor connector cap.
20. Secure the wiring with cable ties.

FIGURE 12

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LEVEL SENSOR ANGLE ADJUSTMENT

SEE ELECTRICAL DIAGRAM D061140 PAGE 32.1 FOR WIRING.
21. Run the vehicle 5 minutes to fill the
pneumatic system with air pressure.
22. Adjust the height of the vehicle to get the
clearance shown in Figure 13 at a value of 12
± ¼” (305 ± 6 mm).

FIGURE 13

23. Locate A46 module into the front service
compartment.

FIGURE 14

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24. Locate pin 13 on connector A46-J1 (the wire
color is white and the wire ID is
‘’KneelLevel’’).

FIGURE 15

25. With a voltmeter, back probe pin 13 of
connector A46-J1. The voltage should be
around 2.5 volts with a clearance of 12 ± ¼”
(305 ± 6 mm).

FIGURE 16

26. If the voltage is higher or lower than 2.5 volts,
loosen the nuts that fix the sensor to the ‘’Cshape’’ support and apply a slight rotation.
27. Tighten the nuts, check the suspension below
clearance and the voltage.
28. Repeat previous steps until you reach 2.5
volts with a clearance of 12 ± ¼” (305 ± 6
mm).

FIGURE 17

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29. Using the kneeling dash switch, adjust the vehicle at its maximum height by pressing and maintaining
the upper part of the switch. Check the voltage. It should be around 3.5 volts.
30. Using the kneeling dash switch, adjust the vehicle at its minimum height. Check the voltage. It should
be around 1.8 volts.
31. Bulletin is complete.

The time to perform all steps is 1 hour.

PARTS / WASTE DISPOSAL
Discard waste according to applicable environmental regulations (Municipal/State[Prov.]/ Federal)

Writer: ml