NHTSA ID Number: 10201840
Manufacturer Communication Number: SP21-309
TSB/Document Date: 2021-10-04
Summary
SNOW CHAIN SYSTEM – LOOSE FITTINGS
SP21-309
Special Bulletin
Date
Expiration
Release
Page
09.2021
09.2023
1
1(8)
First Release .
09-07-2021
SNOW CHAIN SYSTEM – LOOSE FITTINGS
Prevost
vehicles
DESCRIPTION
On the vehicles involved, perform the following corrective measures.
MODEL YEAR(S) AND VEHICLES INVOLVED
NOTICE TO SERVICE CENTERS
Verify vehicle eligibility by checking warranty bulletin status with SAP or via ONLINE WARRANTY
SYSTEM available on Service / Warranty tab of Prevost website.
VIN
Model
X3-45 Commuter
Model Year: 2021
Writer: EL
4RKJ33492M9737751
4RKJ33498M9737768
4RKJ3349XM9737769
4RKJ33496M9737770
4RKJ33498M9737771
4RKJ3349XM9737772
4RKJ33491M9737773
4RKJ33493M9737774
4RKJ33495M9737775
4RKJ33497M9737776
4RKJ33499M9737777
4RKJ33490M9737778
4RKJ33492M9737779
4RKJ33499M9737780
4RKJ33490M9737781
4RKJ33492M9737782
4RKJ33494M9737783
4RKJ33496M9737784
4RKJ33498M9737785
4RKJ3349XM9737786
4RKJ33491M9737787
4RKJ33493M9737788
4RKJ33495M9737789
4RKJ33491M9737790
4RKJ33493M9737791
4RKJ33495M9737792
4RKJ33497M9737809
4RKJ33493M9737810
4RKJ33495M9737811
4RKJ33497M9737812
4RKJ33499M9737813
4RKJ33490M9737814
4RKJ33492M9737815
4RKJ33494M9737816
4RKJ33496M9737817
4RKJ33498M9737818
4RKJ3349XM9737819
4RKJ33496M9737820
4RKJ33498M9737821
4RKJ3349XM9737822
4RKJ33491M9737823
4RKJ33493M9737824
4RKJ33495M9737825
4RKJ33497M9737826
4RKJ33499M9737827
4RKJ33490M9737828
4RKJ33492M9737829
4RKJ33499M9737830
4RKJ33490M9737831
4RKJ33492M9737832
4RKJ33494M9737833
4RKJ33496M9737834
SP21-309
Special Bulletin
Date
09.2021
4RKJ33497M9737793
4RKJ33499M9737794
4RKJ33490M9737795
4RKJ33492M9737796
4RKJ33494M9737797
4RKJ33496M9737798
4RKJ33498M9737799
4RKJ33490M9737800
4RKJ33492M9737801
4RKJ33494M9737802
4RKJ33496M9737803
4RKJ33498M9737804
4RKJ3349XM9737805
4RKJ33491M9737806
4RKJ33493M9737807
4RKJ33495M9737808
Expiration
Release
Page
09.2023
1
2(8)
4RKJ33498M9737835
4RKJ3349XM9737836
4RKJ33491M9737837
4RKJ33493M9737838
4RKJ33495M9737839
4RKJ33491M9737840
4RKJ33493M9737841
4RKJ33495M9737842
4RKJ33497M9737843
4RKJ33499M9737844
4RKJ33490M9737845
4RKJ33492M9737846
4RKJ33495M9737856
4RKJ33490M9737859
4RKJ33491M9737871
4RKJ33493M9737872
This bulletin does not necessarily apply to all the above-mentioned vehicles, some vehicles may have been modified
before delivery.
MATERIAL NEEDED
Order the following parts:
Part No.
Description
Qty
501159
FITTING A 90 SW 1/4PMX#6JM
4
507033
4
Other parts that may be required:
Part No.
680098
Description
LOCTITE 567 THREAD SEALANT
NOTE
Material can be obtained through regular channels.
REQUIRED TOOLS
Writer: EL
SP21-309
Special Bulletin
Date
Expiration
Release
Page
09.2021
09.2023
1
3(8)
METRIC OPEN END WRENCH SET
CURVED JAW VISE PLIERS
TORQUE WRENCH AND METRIC SOCKET SET
Writer: EL
SP21-309
Special Bulletin
Date
Expiration
Release
Page
09.2021
09.2023
1
4(8)
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.
Lockout & Tag out (LOTO) must be performed during set-up, maintenance or repair activities. Refer to
your local procedure for detailed information regarding the control of hazardous energy.
1. Drain the accessory air tank. It is
equipped with a drain cock underneath
the tank. Drain tank by turning cock
counterclockwise.
FIGURE 1: ACCESSORY AIR TANK FOUND ABOVE THE
SECONDARY AIR TANK JUST BEHIND THE FRONT AXLE
2. Locate the snow chain system on the
inner side of the drive axle wheels.
FIGURE 2
Writer: EL
SP21-309
Special Bulletin
Date
Expiration
Release
Page
09.2021
09.2023
1
5(8)
3. Identify the two hoses shown on the
image for later reinstallation. Add a label
for the CYLINDER CAP hose and another
label for the CYLINDER SIDE hose.
4. Disconnect the two pneumatic hoses from
the 90° fittings shown.
5. Do the same on the other cylinder.
FIGURE 3
CURB SIDE CYLINDER
6. Remove both restriction fittings along with
washer and the 90° fitting.
Restriction 0.9 mm
Warning: size is specific to curb side
restriction fittings and is identified with a
groove!
FIGURE 4
Writer: EL
SP21-309
Special Bulletin
Date
Expiration
Release
Page
09.2021
09.2023
1
6(8)
CURB SIDE CYLINDER
7. On both fitting assemblies, replace the
existing 90° fitting with the new 90° fitting
501159.
Apply Loctite 567 Thread sealant on the
NPT threads
Tighten by hand first then add 1 ½ turn
Figure 5
CURB SIDE CYLINDER
8. Reinstall the new fitting assemblies on the
cylinder along with new washer 507033.
tighten fittings to 16 lbf-ft
Figure 6
9.
While holding the cylinder end cap with
curved jaw vise pliers, tighten the fitting to
16 lbf-ft.
Figure 7
STREET SIDE CYLINDER
Writer: EL
SP21-309
Special Bulletin
Date
Expiration
Release
Page
09.2021
09.2023
1
7(8)
10. Repeat steps 6-9 for the street side
cylinder.
Restriction 0.6 mm
Warning: NO groove on street side
restriction fittings
11. Reinstall the hoses on both cylinders.
Tighten the fitting using two open end
wrench.
Tighten by hand first then add 120° turn
FIGURE 8
Figure 9
12. Start the vehicle and allow the Accessory
system to reach normal pressure. Check
for air leaks using soapy water.
Writer: EL
SP21-309
Special Bulletin
PARTS / WASTE DISPOSAL
Date
Expiration
Release
Page
09.2021
09.2023
1
8(8)
Discard waste according to applicable environmental regulations (Municipal/State [Prov.]/ Federal)
ESTIMATED TIME
The time required to perform this special bulletin is approximately 1/2 hour.
OTHER
VBC Bulletin
N/A
Fail Code
12.00
Defect Code
09
Syst. Cond
B
Causal Part
501695
Access all our Service Bulletins on
http://techpub.prevostcar.com/en/
or scan the QR-Code with your smart phone.
Prevost engages in a continuous program of testing and evaluating to provide the best possible product. Prevost, however, is not
committed to, or liable for updating existing products.
Writer: EL
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TSB/Document ID: SP21-309
Replacement Service Bulletin Number:
MFR Communication Date: 2021-09-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
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