DT12 PTO Upfit
TSB-26-052-FTL

Creation Date: 2019-09-13
Last Revision Date: 2026-01-06

Engine or Vehicle Affected:

» Cascadia

» New Cascadia
Description of Revisions: This bulletin replaces the version dated
2019-13-09. DDCSN and Power Service Literature references have
been removed.

Overview

The DT12 transmission is available with a rear mounted PTO prep option. The option includes all the vehicle
wiring and transmission elements needed to support the PTO without the addition of the PTO hardware on the
transmission. Check the information in PartsPro MOD 362, to confirm the vehicle being fitted with the PTO was
ordered with the prep option.

@ Warning: Mounting a PTO to a DT12 transmission is supported only for GHG17
vehicles. Adding a PTO to older models, or current models that were not ordered with
PTO or PTO prep, will not work or may function incorrectly. Vehicle and transmission
warranty will be affected by installing an unsupported option, and could be
dangerous.

The additional hardware needed to complete the installation includes the PTO, a transmission oil pump drive
shaft, and a selection of shims. All the required components are available as three separate kits:

e PTO assembly (includes the PTO service part)

¢ PTO installation kit (includes the bolts, seals, oil pump driveshaft assembly, and oil pump thrust plate)

¢ Oil pump shim kit (includes the five most common shims required)

Note: Some chassis air system components may also be required.

installation Inf ti
I wet

The installation process includes removing the non-PTO oil pump cover and oil pump driveshaft, determining the
oil pump shim needed, and installing the PTO. For the procedure, log onto www.DTNAConnect.com and select
‘go to secure DTNAConnect. Under Search Technical Literature , select Detroit Literature Make

and Transmission Model, click GO.

Chassis

The wiring is detailed in MOD 885 and in PartsPro for VINs spec’d with PTO and PTO prep.
The air system is detailed in MOD 372, MOD 46D, and in PartsPro for VINs spec’d with PTO. See Table
2 and Table 3 for parts update and BOM reference information on installing the new equipment.

Mechanical
The PTO has length, speed, and pump requirements that need to be well understood by the equipment installer
and the customer. Inform the customer of the web-based information available on the DT[INAConnect website,

and make sure they have access to the DT72 PTO Installation Guide ( https://dtnacontent-
dtna.prd.freightliner.com/content/dam/public/DDCSN/EngineeringDocs/DT12%20PTO%20Installation%20Guide.p

Parameters

The parameters needed to make the PTO function are included in the order specifications, and no changes
should be required when the PTO is installed. However, if the customer requires changes to the parameters, refer
to GHG14/GHG17 DDEC73 Electronic Controls Application and Installation manual on the DTNAConnect website
for available options ( https://dtnacontent-dtna.prd.freightliner.com/content/dtna-servicelit/ddc/en_us/detroit-
literature/detroit-a-i-manual/ghg14-17-ddec-electronic-controls-a-i-manual-ddc-svc-man-0127.html? ).

Parts

See Table_1, Table_2 and Table 3 for parts that are required to upfit a PTO to a vehicle equipped with the PTO
prep option. Parts can be ordered through the PDCs.

Table 1, Transmission Parts

Part Number Description Qty.
A 947 260 0605 PTO, DT12, ASSEMBLY (1:1.32 ratio) 1
or PTO, DT12, ASSEMBLY (1:1 ratio)

A 947 2600705

A 947 260 24 92 SHAFT, OIL PUMP, PTO INST, KIT, DT12 A 1
or SHAFT, OIL PUMP, PTO INST, KIT, DT12 B
A 947 260 21 92

A 389 262 50 56 SHIMS, TRANS OIL PUMP, TOP 5, KIT 1

Optional (used for a driveline output from the PTO)

A 947 260 0417 FLANGE, SPICER 1300, 89 PTO, KIT 1
or FLANGE, SPICER 1400, 89 PTO, KIT
A 947 260 03 17

Table 1, Transmission Parts
Table 2, Air System Parts (372-C01704 or similar)

Part Number Description Qty.
23-13481-000 STRAP-TIE, ANTI-VIB, M6.3, FIR TR 5
48-25855-010 TUBE-NYL 12, 1/4", BLACK 15 ft.

SMCKV2L07 36S ELB-90, 1/4PC+3/8MPT, GRY 1

D12-28174-000

SCHEM-AIR PPPTO SUPPLY,DT12

D12-28175-000

INSTALL-PTO AIR SUPPLY, DT12

Table 2, Air System Parts (372-C01704 or similar)
Table 3, Pressure Protection Parts (46D-D61401 or similar)

Part Number

Description

Qty.

GTD 223 475

VALVE-PRESS PROTECTION, 75 PSI

23-14396-003

ELB-90,1/4 PTC X 3/8 MPT

23-14396-006

ELB-90,3/8 PTC X 3/8 MPT

23-14415-001

PLUG-1/4 PUSH TO CONNECT

D12-28174-000

SCHEM-AIR PPPTO SUPPLY,DT12

D12-28175-001

INSTALL-PTO PREP KIT, DT12

Table 3, Pressure Protection Parts (46D-D61401 or similar)

VIN Update

Record the changes to the VIN information, using the global annotation tool on PartsPro. Refer to Parts

Technical Bulletin 00-009 for the global annotation procedure, and add a note with the number and name for
this bulletin (26-052), so the next location performing service will understand what changes have been made to

the vehicle.

Service Parts

Use the information in Fig._1 and Table 4 to identify additional parts and service information, beyond what is
required for the PTO installation. Since the PTO was not factory installed, this information will not be available in

PartsPro by searching the VIN.

Table 4, Service Parts

Ref No.! Part Number Description Qty.
82 004 998 2150 PLUG (M12X1.5) 1
83 947 267 00 76 SEAL 1
84 029 997 89 45 SEAL-PTO OUTPUT 1
85 013 994 29 41 CIRCLIP-INTERNAL 1
89 947 250 00 54 FITTING-AIR (-4 PTC HOSE) 1
90 947 540 00 97 SWITCH 1
91 000 990 12 80 COVER-FLANGE, SAE B 1
93 947 268 00 27 STUD-DRIVE FLANGE 1

94 016 990 46 82 SPACER-DRIVE FLANGE
95 DDE N910112008000 NUT
96 947 260 00 55 FLANGE-SPICER 1300
97 947 260 01 55 FLANGE-SPICER 1400
98 947 264 02 80 GASKET-PTO/TRANS
99 029 997 72 45 O-RING-PTO/TRANS
100 947 260 26 92 SHAFT, OIL PUMP DRIVE, W/ PTO, DT12 A
947 260 25 92 SHAFT, OIL PUMP DRIVE, W/ PTO, DT12 B
101 947 260 05 17 BEARING-PTO INPUT
102 947 265 00 36 CIRCLIP-EXTERNAL
103 947 260 01 52 PLATE-OIL PUMP COVER
104 DDE N910143010014 SCREW (MIOX35-10.9)
106 947 260 13 57 VLV-ELEC, KIT W/ SEALS/ PTO
107 947 260 0417 FLANGE-SPICER 1300, 89 PTO, K
108 947 260 03 17 FLANGE-SPICER 1400, 89 PTO, K
109 947 260 21 92 SHAFT-OIL PUMP, PTO INST, KIT
111 389 262 38 56 SHIM-OIL PUMP
129 000912 010219 SCREW SOCKET-HEAD (M10X35, 10.
207 947 264 01 07 PNEUMATIC VALVE PLATE
1. See Fig._1.

Table 4, Service Parts

95

08/29/2019
w Note: Refer to Table 4 for part numbers, descriptions, and quantities.

Fig. 1, Service Parts—PTO (342-C93063 or similar)

Warranty

This is an informational bulletin only. Warranty does not apply.

Note:
INSTALL
F12

F22

F16

F26

F35

F36

Y12

CONTACT INFORMATION
For questions, please create a Service Technical Request using the DTTS Application on the DTNA Portal.

Document Number: 0000140853
Topic Publication Date: 2026-01-15