FIELD SERVICE CAMPAIGN
BULLETIN
Subject: Field Service Campaign 18M4

Remanufactured Detroit™ DT12™ Transmission
Issue Involved
Detroit Diesel Corporation (DDC) has determined that some remanufactured
Detroit™ DT12™ transmissions will need to be inspected, and have the rear range
housing or transmission replaced.
Correctly built transmissions became effective with transmissions manufactured
starting approximately in September, 2017. Any remanufactured Detroit™ DT12™
transmission manufactured before September, 2017, will need to be inspected and
repaired. Note that some transmissions may already have been repaired and will be
excluded from this program.
Inspection and repair of the remanufactured Detroit™ DT12™ transmission may
prevent transmission shifting issues.
There are approximately 376 transmissions affected by this Field service campaign.

Transmissions Involved
A list of transmissions located in your area of responsibility that require this correction is
attached.
The table below gives descriptive information to help identify the affected units:
Model
Series

Model
Number

DT12-DA

716320

DT12-OA

716330

DT12-DB

716300

DT12-OB

716310

Inclusive Transmission Mfg. Date
(From) (To)

August, 2016, through September, 2017

Field service campaign Bulletin 18M4
Page Two

Owner Notification
Detroit Diesel will notify owners of equipment incorporating transmissions identified
with this Field service campaign. A copy of the owner letter that will be used by
Detroit Diesel is enclosed with this Field service campaign bulletin.

Dealer Campaign Responsibility
Detroit Diesel repair facilities are to service all transmissions subject to this Field
service campaign. Field service campaign 18M4 is to be performed at no charge to
owners on all affected transmissions under the transmission warranty. Please use the
appropriate steps, noted below, for indicating that Field service campaign 18M4 has
been completed.
Daimler Trucks North America Vehicles




Check the base label (Form WAR259) to see if Field service campaign 18M4
has been completed. The base label is usually located on the passenger-side door
about 30 cm (12 inches) below the door latch. If Field service campaign 18M4
has been completed, no further work is needed. If base label is not located on the
passenger-side door, please affix label (Form WAR259) 30 cm (12 inches) from
the door latch.
Upon completion of Field service campaign 18M4, clean a spot on the base label
(Form WAR259), write the Field service campaign Number (18M4) on a blank,
black completion sticker (Form WAR261), and attach it to the base label.

Ordering Information
1. If you do not have the appropriate Form or Labels (DDC_WAR 259,

DDC_WAR 260. DDC_WAR 261), they can be ordered from EPI Printers by
emailing your order to [email protected].
2. You can also fax in your order to 269-698-4240 Attn: Corrina Cotton

3. Contact EPI at 734-464-9000.

Field service campaign Bulletin 18M4
Page Three

Parts Information
See Table 1 below for a list of possible parts required for this Field Service Campaign.
EITHER the rear range housing or complete transmission will be replaced based on the
Corrective Procedure. Order the applicable part number only after completing steps 1-3
of the Corrective Procedure.
Remanufactured
Transmission P/N

Rear Range
Housing P/N

Rear Range Housing Description

DDE A9602600302RB

DDE R23565081

Range Model A, Plugged, Flange

DDE R23565082

Range Model A, Oil Cooler Fitting,
Flange

DDE R23565083

Range Model A, Oil Cooler Fitting,
Yoke

DDE R23565078

Range Model B, Plugged, Yoke

DDE R23565079

Range Model B, Oil Cooler Fitting,
Yoke

DDE R23565080

Range Model A, Plugged, Yoke

DDE A9602600402RB
DDE A9602600502RB
DDE A9602600602RB
DDE A9602609601RB
DDE A9602609801RB
DDE A9602609901RB

Table 1 – Transmission And Rear Range Housing Part Numbers

Corrective Procedure
1. Park the vehicle on a level surface, turn off the ignition, set the parking brake,
chock the wheels, and perform any other applicable safety steps.

Field service campaign Bulletin 18M4
Page Four

PERSONAL INJURY
To avoid injury from hot surfaces, wear protective gloves, or allow
transmission to cool before removing any component.

ELECTRICAL SHOCK
To avoid injury from electrical shock, use care when connecting battery
cables. The magnetic switch studs are at battery voltage.

2. Disconnect the batteries at the negative post, including the batteries for the
auxiliary HVAC, if equipped.
3. Perform a transmission fluid inspection. REFERENCE chapter “Symptom
Diagnostics-Transmission Fluid Inspection” and section “Transmission Fluid
Inspection” in the Detroit Transmission Manual (DDC-SVC-MAN-0140). Is there a
normal amount of metal on the magnetic drain plugs and fluid screen?
a. Yes; there is a normal amount of metal on the magnetic drain plugs and
fluid screen, proceed to step 4.
b. No; there is an abnormal amount of metal on the magnetic drain plugs and
fluid screen, replace the transmission. REFERENCE chapter “DT12
Transmission” and sections “Removal of the Transmission” and
“Installation of the Transmission” in the Detroit Transmission Manual
(DDC-SVC-MAN-0140). Proceed to step 39.

Field service campaign Bulletin 18M4
Page Five

4. Remove the transmission. REFERENCE chapter “DT12 Transmission” and
section “Removal of the Transmission” in the Detroit Transmission Manual (DDCSVC-MAN-0140).
5. Remove the air fittings connected to the range cylinder (4). See Figure 1.

Figure 1 – Range Cylinder Air Lines

6. Disconnect the range position sensor (1) and output shaft speed sensor (2) from
the transmission wiring harness. See Figure 1.
7. Remove the air line (3) and wire harness raceway. See Figure 1.

Field service campaign Bulletin 18M4
Page Six

EYE INJURY
To avoid injury from flying parts when working with components under
spring tension, wear adequate eye protection (face shield or safety goggles).

NOTICE:
The range detent spring is under pressure, and must be held back to
prevent the spring from catapulting the shift fork detent spring nut, possibly
causing thread damage to the case and potential injury from flying parts.

8. Remove the range shift fork detent spring nut cap (1). As the nut is removed,
push in with enough force to prevent the spring from catapulting the nut. After the
spring is removed, remove the range detent shaft. See Figure 2.

Figure 2 – Range Shift Fork Detent Spring Nut Cap

Field service campaign Bulletin 18M4
Page Seven

9. For A-box transmissions only, remove the top two bolts on the range housing
bolting flange, and install the lifting eye (special tool DDE W 715 589 00 40 00).
B-box transmissions have an integrated lift eye in the range housing casting. See
Figure 3.

Figure 3 – Lifting Eye (special tool DDE W 715 589 00 40 00) Installed

Field service campaign Bulletin 18M4
Page Eight

10. Remove the cap screws that attach the oil pump cover to the transmission
housing. Remove the oil pump cover. See Figure 4.

Figure 4 – Oil Pump Cover

Field service campaign Bulletin 18M4
Page Nine
11. Remove the oil pump relief valve (1), oil pump drive shaft (3), and pump rotors.
See Figure 5.

Figure 5 – Oil Pump Relief Valve And Drive Shaft

12. Attach the lifting device and then remove the remaining fasteners.

Field service campaign Bulletin 18M4
Page Ten

13. Install guide pins. See Figure 6.

Figure 6 – Guide Pins

Field service campaign Bulletin 18M4
Page Eleven

14. Install the kit of three set screws and pushing screws (special tool DDE W 715
589 14 33 00). See figure below for pushing screw locations. Turn all three
screws in even, incremental steps, to push the housing off the dowel pins. While
the housing is being pushed back, the planetary housing flange may tend to bind
on the alignment dowels. Take steps to keep the flange parallel to the housing
face to ease the removal of the housing. See Figure 7.

Figure 7 – Pushing Screw Locations

Field service campaign Bulletin 18M4
Page Twelve

15. The planetary guide dowels may pull out from the case upon removal; if
necessary, gently reseat the guide dowels back into the case. See Figure 8.

Figure 8 – Guide Dowels

16. Remove the pushing screws and set screws. See Figure 7.
17. Clean the housing flanges and threaded holes.
18. Remove the sun gear snap ring and gear.

Field service campaign Bulletin 18M4
Page Thirteen

19. Install the new sun gear and snap ring. Read note below before installing to
ensure proper gear orientation. See Figures 9 and 10.
NOTICE:
The location of the oil groove, holes in the sun gear, and the oil holes in the
main shaft need to be aligned to supply oil between the sun and planet gears
of the range group. Install the sun gear with the flat side facing out towards the
snap ring groove is shown below (See callout A). The sun gear with the
beveled spline side facing inwards towards the center case is shown below
(See callout B).

Figure 9 – Sun Gear With The Flat Side Facing Out Towards The Snap Ring
Groove

Field service campaign Bulletin 18M4
Page Fourteen

Figure 10 – Sun Gear with The Beveled Spline Side Facing In Towards The
Center Case
20. Apply Loctite® 518 sealant to the flange on the range group.
21. Align the range housing on the guide bolts and slide the range housing into
position while engaging the flange of the planetary carrier on the guide pins. Use
the flange bolts to evenly pull the range box onto the dowel pins.
22. Torque the range housing flange bolts to 80 N·m (59 lb·ft).

Field service campaign Bulletin 18M4
Page Fifteen

23. Apply Loctite® 243 or 248 to the threads of the range shift fork detent spring nut
cap and reinstall the detent, spring and nut cap into the transmission. You will
need to push on the nut cap towards the transmission to compress the spring (80
lbs) when installing it. Tighten the nut cap to 60 N·m (44 lb·ft ). See Figure 11.

Figure 11 – Installation Of Range Shift Fork Detent Spring Nut Cap

24. Install the harness raceway, and tighten to 10 N·m (90 lb·in.).
25. Install the range shift air lines, and torque it to 12 N·m (105 lb·in.).
26. Install the wire harness connections for the output shaft speed sensor, and range
position sensor. If any zip ties were removed during the procedure, replace those
zip ties.

Field service campaign Bulletin 18M4
Page Sixteen

27. Install the oil pump drive shaft. Make sure the rotors have the sides with the dot
(A) facing the oil pump cover. See Figure 12.

Figure 12 – Installation of Oil Pump Rotors

28. Clean the bore for the oil control valve. This helps the O-ring retain the relief
spring force while the pump cover is being installed.
NOTICE:
On oil-cooler-equipped transmissions, align the pressure relief valve
locating dowel, with the hole on the cover. The correct pin location is
approximately the 9 o’clock position

Field service campaign Bulletin 18M4
Page Seventeen

29. Apply Loctite® 518 sealant to the oil pump cover mating surface.
30. Install the oil pump relief valve. See Figure 13 and Table 2.

A
B
C
Figure 13 – Oil Pump Relief Valve
A Transmission Without An Oil Cooler (Previous Design)
B Transmission Without An Oil Cooler (Current Design)
C Transmission With An Oil Cooler
Table 2 – Oil Pump Relief Valve
31. Install the oil pump cover, and apply medium strength Loctite® 248 to the bolts.
Tighten the bolts evenly to 50 N·m (37 lb·ft).

Field service campaign Bulletin 18M4
Page Eighteen

NOTICE:
The drilling process is only required to allow the head of the rivet to break
off easily. Do not drill into the rivet more than 0.1”.

32. Using a 3/32” bit, drill the rivets on the Identification Tag on the old range
housing. See Figure 14.
33. Gently pry off the Identification Tag for transfer to the new range housing. See
Figure 14.

Figure 14 – Identification Tag Removal

34. Thoroughly clean and dry the Identification Tag area on the new range housing.

Field service campaign Bulletin 18M4
Page Nineteen

35. Install the Identification Tag on the new range housing by applying some RTV
sealant to the back, and hammering the U-Drive rivets, included with the
remanufactured range housing, into position. See Figure 15.

Figure 15 – Identification Tag Installation

36. Install the transmission. REFERENCE chapter “DT12 Transmission” and section
“Installation of the Transmission” in the Detroit Transmission Manual (DDC-SVCMAN-0140).
37. Fill the transmission with oil.
38. Connect to DiagnosticLink® 8.07 or higher, and under the Actions menu
Transmission perform a transmission learn routine.
39. The repair is complete.

Field service campaign Bulletin 18M4
Page Twenty
Notice
Claim administration time, SRT 939-6010A, for 0.3 hours will automatically be added.
No additional operation is required or will be allowed

Warranty Information
Truck Model

Cascadia

Claim Type:
Modification
Cause Code:
Primary Failed Part:
Labor Code:

Western Star

Labor:
Labor Code:
Labor:

Cascadia

Labor Code:

Western Star

Labor:
Labor Code:

CAMPAIGN
D18M4
A1-CAMPAIGN
A9602609901RB
996-F016A – RANGE GROUP,
REMAN, UPDATE (MY18M4)
8.0 Hours
996-F016A – RANGE GROUP,
REMAN, UPDATE (MY18M4)
9.0 Hours

Labor:

996-F016B – RANGE GROUP,
REMAN, INSPECT &
REPLACE TRANSMISSION
(MY18M4)
6.6 Hours
996-F016B – RANGE GROUP,
REMAN, INSPECT &
REPLACE TRANSMISSION
(MY18M4)
7.6 Hours

Parts Return:

RETURN

Please contact the Detroit™ Customer Support Center at 800-445-1980 or email
[email protected] if you have any questions.

DETROIT DIESEL
13400 Outer Drive West

Detroit, Michigan 48239-4001
BULLETI8.0