NHTSA ID Number: 10165412
Manufacturer Communication Number: SB26-051
TSB/Document Date: 2019-09-27
Summary
Service Bulletin for DT12 Transmission Cooler Retrofit
Cargo
Columbia
Freightliner
Service Bulletin
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
02/07/2017
f261485
Fig. 12, Sealant Applied to Pump Cover
WARNING
The oil control valve is spring-loaded and will only stay in place due to the drag from the O-ring for a
short period of time. Be ready to install the cover once the valve is in place as it can dislodge from the
port and spring-launch small parts across the shop floor.
10. Install the oil control valve with the roll pin at the 9 o’clock position. See Fig. 13.
Freightliner Service Bulletin, 09/18/2019
Page 11
26-051
DT12 Transmission Cooler Retrofit
Freightliner
Service Bulletin
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
A
1
07/18/2019
f261507a
1. Oil Control Valve Roll Pin
A. Oil control valve with the roll pin at the 9 o’clock
position.
Fig. 13, Installing New Control Valve
11. Install the pump cover (Fig. 14) and tighten the capscrews 37 lbf·ft (50 N·m).
Fig. 14, Pump Cover Installed
12. Remove the transmission fill plug and fill the transmission with Detroit Synthetic Transmission fluid,
approximately 4.25 gal (16 L).
13. Install the fill plug, using a new seal ring, and tighten it 45 lbf·ft (60 N·m).
Page 12
Freightliner Service Bulletin, 09/18/2019
26-051
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
Freightliner
Service Bulletin
Line Installation
1. If the vehicle was previously equipped with an oil cooler located in the bottom tank of the radiator, remove
the lines and decommission the in-tank cooler by allowing the oil to drain out and capping the ports in the
radiator.
2. Fit the new cooler lines, according to the install diagram (Fig.15).
NOTE: Details are shown in the figures following.
• For DD13 engines, see details A, B, C, D, F, and H.
• For DD15 engines, see details A, B, C, E, G, and J.
Fig. 15, New Cooler Line Install
Freightliner Service Bulletin, 09/18/2019
Page 13
26-051
DT12 Transmission Cooler Retrofit
Freightliner
Service Bulletin
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
50
1
19
4
3
07/09/2019
f261513
NOTE: For parts other than what is listed below, the reference numbers correspond to the parts tables.
1. Transmission Cooler
Fig. 16, Detail A (DD13 and DD15)
Page 14
Freightliner Service Bulletin, 09/18/2019
26-051
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
Freightliner
Service Bulletin
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
7, 8, 9
18
3
8
4
07/09/2019
f261514
NOTE: The reference numbers correspond to the parts tables.
Fig. 17, Detail B (DD13 and DD15)
Freightliner Service Bulletin, 09/18/2019
Page 15
26-051
DT12 Transmission Cooler Retrofit
Freightliner
Service Bulletin
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
10
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
9, 20, 21
3
4
12
11
07/09/2019
f261515
NOTE: The reference numbers correspond to the parts tables.
Fig. 18, Detail C (DD13 and DD15)
Page 16
Freightliner Service Bulletin, 09/18/2019
26-051
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
Freightliner
Service Bulletin
NOTE: The reference numbers correspond to the parts tables.
Fig. 19, Detail D (DD13)
Freightliner Service Bulletin, 09/18/2019
Page 17
26-051
Freightliner
Service Bulletin
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
NOTE: The reference numbers correspond to the parts tables.
Fig. 20, Detail E (DD15)
Page 18
Freightliner Service Bulletin, 09/18/2019
26-051
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
Freightliner
Service Bulletin
NOTE: The reference numbers correspond to the parts tables.
Fig. 21, Detail F (DD13)
Freightliner Service Bulletin, 09/18/2019
Page 19
26-051
Freightliner
Service Bulletin
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
NOTE: The reference numbers correspond to the parts tables.
Fig. 22, Detail G (DD15)
Page 20
Freightliner Service Bulletin, 09/18/2019
26-051
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
Freightliner
Service Bulletin
NOTE: The reference numbers correspond to the parts tables.
Fig. 23, Detail H (DD13 with DT12B transmission)
NOTE: The reference numbers correspond to the parts tables.
Fig. 24, Detail J (DD15 with DT12A transmission)
Freightliner Service Bulletin, 09/18/2019
Page 21
26-051
Freightliner
Service Bulletin
DT12 Transmission Cooler Retrofit
FLA COE
FLB COE
FLD Conventional
Business Class
FLC 112 Conventional
Century Class Conventional
Argosy COE
Cargo
Columbia
122SD and Coronado
Business Class M2
> Cascadia
108SD/114SD
3. Tighten the line fittings 36 to 39 lbf·ft (49 to 53 N·m).
4. Tighten the cushion clamps 11 lbf·ft (15 N·m).
5. Install the butterfly tie in the front hose section (Ref. 10, Fig. 18).
6. Drive the vehicle until the oil temperature has reached 176°F (80°C), then top off the fluid to compensate
for filling the cooler and the lines.
Special Tool
Special tool DSN012T18001 is required to mark the drilling locations and drill the holes on the radiator frame.
Parts
Parts are available from the PDCs. See the appropriate table, based on the transmission model (DT12A or
DT12B), engine (DD13 or DD15), and cab (113-inch or 125-inch), for required parts.
NOTE: If the vehicle has an existing oil cooler, new fittings (A 001 997 74 70) are not required.
Parts Required, BOM 383-T20000 (DT12B, DD13, Cascadia 113" Cab)
Reference
Part Number
Item Description
Number
TUBE-HOT,P3,DD13,DT12B
5
07-24613-000
TUBE-COLD,P3,DD13,DT12B
6
07-24614-000
BRKT-RAD SUPT,P3,DT12,AOC
18
07-24620-000
SPACER, TUBULAR ALUMINUM
13
23-11427-050
SWIVEL-90 DEG,8 C6X,FT
15
23-12135-002
SPACER-NYLON, .38 ID X .31 LG, .75 OD
21
23-12262-001
DUAL TUBE CLAMP, VNYL DIPPD,3/4
20
23-13629-075
CLAMP-COOLER LINE, TUBE SNAP
7
23-13687-000
VERSION
SCREW-M8X60,8.8
22
N910105 008006
BOLT HEX HEAD FLANGE M8X1.25X16-10.9
11
DDE N910105008008
BOLT-M8X40,GRD8.8,DBL9440.40
8
N910143 008005
NUT, HX FLNG MTRC,M8X1.25,CLS 8
19
DDE N910112008000
NUT
9
DDE N000000003175
NUT-U, METRIC,M8X1.25
N/A
23-12625-010
NUT, INSERT
N/A
23-12631-381
BRACKET-SUPPORT, TRANS COOLER
12
A07-22753-001
TUBE-JUMPER,HOT,P3,AOC
3
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TSB/Document ID: SB26-051
Replacement Service Bulletin Number:
MFR Communication Date: 2019-09-27
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
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