FSB 491-032 Service Bulletin/Repair Instructions

Field Service Bulletin

Trucks
Volvo Trucks North

America

Greensboro, NC USA
Date
3.2021
Group
No.
491 032
Release
01
Page
1(13)
Transmission Oil Cooler Hose, Replacement

VN, VHD, VAH
FSB 491-032 Transmission Oil Cooler Hose,

Replacement

(March 2021)

When replacing the transmission oil cooler hose on vehicles build prior to November 13th,

2020, new oil cooler hose lines will be necessary to connect the oil cooler. The new oil cooler

hoses increase the sealing capacity.
Required Parts

Quantity
Part Number
Part Description
1
23790464
Oil hose
1
23790470
Oil hose
1
23902388
Bracket
You must read and understand the precautions and guidelines in Service Information,

group 40, "General Safety Practices, Transmission" before performing this procedure. If

you are not properly trained and certified in this procedure, ask your supervisor for training

before you perform it.

NOTE: Information is subject to change without notice. Illustrations are used for reference

only and can differ slightly from the actual vehicle being serviced. However, key

components addressed in this information are represented as accurately as possible.

1 Park the vehicle on a flat and level surface.

2 Apply the parking brake.

3 Place the transmission in neutral or park.

4 Install the wheel chocks.
W7086748
PV729-FSB491-032_V
USA154738474
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
5 Unlatch and remove the battery box cover.

6 Disconnect the cable from the battery’s negative terminal.
T3164283
.

7 Raise and support the vehicle.

8 Remove the screw and the nut.

9 Remove the clamp.
T4164285
.
Page

2(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
10 Remove the screw.

11 Remove the bracket.
T4164286
12 Loosen the nuts.
T4164287
13 Move aside the hoses.
T4164288
Page

3(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
14 Remove the screws along with the bracket.

15 Move aside the assembly.
T4164289
16 Remove the fittings.

Note: Discard the fittings and seals.
T4164425
Page

4(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
17 Remove the hose

Note: Discard the hose, fittings and seals.

Note: Use a wrench to hold the fitting adapter from turning.
T4164290
18 Remove the hose.

Note: Discard the hose, fittings and seals.

Note: Use a wrench to hold the fitting adapter from turning.
T4164291
Page

5(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
19 Remove the fittings.

Note: Discard the fittings and seals.
T4164426
20 Position the assembly.
T4164351
Page

6(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
21 Install the screws

Note: Do not install the bracket.

Note: Hand tighten only.
T4164296
22 Remove the screw.

23 Install the bracket.

24 Install the screw.

25 Torque tighten the screw to 24 ±4 Nm (18 ±3 lbf⋅ft).
T4164292
Page

7(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
26 Install the washers.

Note: Use new parts.

27 Install the hose.
T4171213
Note: Check for correct alignment of the hose.
T4171215
28 Torque tighten the hose fittings to 45 ±5 Nm (33 ±4 lbf⋅ft).
T4164365
Page

8(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
29 Install the washers.

Note: Use new parts.

30 Install the hose.
T4171212
Note: Check for correct alignment of the hose
T4171214
31 Torque tighten the hose fittings to 45 ±5 Nm (33 ±4 lbf⋅ft).
T4164428
Page

9(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
32 Remove the bottom screw, then install the bracket along with the screw.
T4164295
33 Torque tighten the screws to 50 ±5 Nm (37 ±4 lbf⋅ft).
T4164364
Page

10(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
34 Install the bracket.

35 Install the screw.
T4164286
36 Install the clamp.

37 Install the screw and the nut.

38 Torque tighten the screw to 9.9 ±1.5 Nm (88 ±13 lbf⋅in).
T4164285
Page

11(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
39 Connect the battery cable to the battery’s negative (ground) terminal.

40 Tighten the fastener to 21 ± 1 Nm (16 ± 1 ft-lb).
T3164283
41 Position and latch the battery box cover.

42 Start the engine and check for leaks.

43 Check the transmission oil level. Replenish with the correct fluid as needed.

44 Remove the wheel chocks.
W7086759
Page

12(13)
Volvo Trucks North America

Field Service Bulletin
Date

3.2021
Group
No.
Release
491
032
01
Reimbursement

This repair may be eligible for reimbursement if a product

failure was experienced within time and mileage limits of

the applicable Warranty coverage. Reimbursement is

obtained via the normal claim handling process.
UCHP

Reimbursement
Claim Type (used only when uploading from the Dealer Bus. 01

Sys.)

Labor Code

Primary Labor Code
4912-03-09-02

1.5 hrs
Causal Part
23701845, 23701846
Note: This only covers transmission oil cooler radiator replacements that are under warranty.

VOLVO Trucks North America reserves the right to make any changes in design or to make

additions to or upon its products without incurring any obligations to install the same on

vehicles previously built.
Page

13(13)

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