SB1826

SERVICE BULLETIN
SB1826
ADDRESSEES
: Owners and operators
VEHICLE MODEL
: CX35, CX45, TX40, TX45, TDX25US
MANUAL CHAPTER
: 02.46 Engine – Accessory drive
BULLETIN TYPE
: Service information
DATE
: June 02nd, 2020
SUBJECT
: Cooling fan drive alignment
CONDITIONS
: This service bulletin does not entitle to any reimbursement.
INTRODUCTION
The purpose of this bulletin is to inform you about how to align the cooling fan drive. This should be
performed every time components of the fan drive have been removed, and when evidence of
contact damage has been noticed on fan or shroud.
Figure 1: Cooling fan drive
JOB QUALIFICATION:
No special job qualification required.
PREPARATIONS:
•
•
•
•
•
•
Park the coach on a level-surfaced service pit.
Apply the parking brake and shut down the engine.
Switch off all systems and turn off the battery master switch.
Turn off the mechanical battery switch.
Put a “DO NOT OPERATE” tag on the instrument panel.
Read the entire procedure before beginning to work.
WARNING!
Observe safe shop practices at all times.
Continued on next page.
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PROCEDURE:
Step
1
2
3
Action
Open the rear engine compartment door.
Release the tension on the fan drive belts and remove the belts from the fan pulley.
Follow the procedure as described in chapter 2.46 of the maintenance manual.
Disconnect the steady rod by removing the outer nut, washer and rubber at the fan
pulley side. Back up the inner nut of the steady rod to create space for adjustment.
Figure 2: Steady rod fixation at
fan pulley side
4
5
6
7
8
9
10
11
12
13
Center the cooling fan blades in the fan shroud as explained under “STEP 4 IN
DETAIL”.
Check the position of the cooling package as explained under “STEP 5 IN DETAIL”.
Reconnect the steady rod as follows:
a. Slide the inner rubber together with the washer against the fan clutch bracket.
b. Screw the inner nut against the washer.
c. Install the outer rubber, washer and nut.
d. Tighten the outer nut with one wrench to a torque of 40 Nm (30 ft.lbf) while
holding the inner nut with a second wrench.
Re-install the fan drive belts and set the tension as described in chapter 2.46 of the
maintenance manual.
Align the idler pulley with the engine pulley as explained under “STEP 8 IN
DETAIL”.
Reset the tension of the fan drive belts.
Align the fan pulley with the idler pulley as explained under “STEP 10 IN DETAIL”.
Reset the tension of the fan drive belts.
To compensate for possible small position changes as a result of belt tensioning:
check the horizontal position of the fan blades within the fan shroud and change, if
necessary, with the steady rod.
Close the rear engine compartment door.
STEP 4 IN DETAIL: To center fan blades within fan shroud
•
•
Horizontal position: slacken the eight nuts securing the fan clutch carrier to the radiator.
Center with the slots in the carrier arms. Tightening torque for nuts: 42 ± 6 Nm (30 ± 4 ft.lbf).
Vertical position: slacken the fourteen screws securing the shroud to the radiator. Center with
the slots in the shroud. Tightening torque for screws: 9 ± 1 Nm (7 ± 0.7 ft.lbf)
Continued on next page.
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STEP 5 IN DETAIL: To check cooling package position with respect to other nearby
components
Be sure there is enough clearance at both sides of the cooling package to prevent possible
interference with other nearby components when the vehicle is in operation. If necessary, slacken
the eight fixation bolts and reposition the cooling package with the slots in the cross section (refer
to figure 3). Tightening torque of nuts: 42 ± 6 Nm (30 ± 4 ft.lbf).
Figure 3: Slots in cross
section to displace cooling
package sideways
STEP 8 IN DETAIL: To align idler pulley with engine pulley
Step
8.1
Action
Place a straight edge ruler against the flanges of engine pulley and idler pulley.
Check if there is equal distance between the outer belt and the ruler over the full
length.
Figure 4
Continued on next page.
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8.2
Repeat step 8.1 for the inner belt.
Figure 5
8.3
If necessary, release the tension on the fan drive belts and reposition the idler with
the slots in the ground bracket. Tightening torque for nuts: 42 ± 6 Nm (30 ± 4 ft.lbf).
Figure 6
Continued on next page.
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STEP 10 IN DETAIL: To align fan pulley with idler pulley
Step
10.1
Action
Place a straight edge ruler against the flanges of fan pulley and idler pulley. Check
if there is equal distance between the outer belt and the ruler over the full length.
Figure 7
10.2
Repeat step 10.1 for the inner belt.
Figure 8
10.3
If necessary, release the tension on the fan drive belts and reposition the cooling
package with the slots in the brackets. Tightening torque for nuts: 110 ± 15 Nm (80
± 10 ft.lbf).
Figure 9
Continued on next page.
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HELP DESK:
If there are any questions, please call ABC Customer Care & Parts Source toll-free for guidance on
1-877-427-7278. Listen for the prompts for warranty and select that option.
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.
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/service,
and only with a code (password) from Van Hool. If you do not have a password yet, request it by
using the above link.
INFORMATION HANDLING:
Important additions and modifications regarding technical information not yet included in the
manual will be communicated through Service Bulletins.
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