26-005

DT12 PTO Upfit
Constellation
Heritage
4700 Models
4800 Models

4900
> 5700
5900
6900

Western Star
Service Bulletin

Models
Models
Models
Models

Description of Revisions: This bulletin replaces the version dated
03/22/2019. The DT12 PTO Installation Guide link has been
revised.

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:
• 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 Information
Transmission
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 into www.DTNAConnect.com, under
My Applications select PSL (Power Service Literature), then select the Transmission category.

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

Western Star Service Bulletin, 09/23/2019

Page 1

26-005

DT12 PTO Upfit

Western Star
Service Bulletin

Constellation
Heritage
4700 Models
4800 Models

4900
> 5700
5900
6900

Models
Models
Models
Models

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 DDEC13 Electronic Controls Application and Installation manual on the DDCSN 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.

A
A
A
A
A
A
A

Transmission Parts
Part Number
Description
947 260 06 05
PTO, DT12, ASSEMBLY (1:1.32 ratio)
or
947 260 07 05
PTO, DT12, ASSEMBLY (1:1 ratio)
947 260 24 92
SHAFT, OIL PUMP, PTO INST, KIT, DT12 A
or
947 260 21 92
SHAFT, OIL PUMP, PTO INST, KIT, DT12 B
389 262 50 56
SHIMS, TRANS OIL PUMP, TOP 5, KIT
Optional (used for a driveline output from the PTO)
947 260 04 17
FLANGE, SPICER 1300, 89 PTO, KIT
or
947 260 03 17
FLANGE, SPICER 1400, 89 PTO, KIT

Qty.
1

1
1

1

Table 1, Transmission Parts

Part Number
23-13481-000
48-25855-010
SMCKV2L07 36S
D12-28174-000
D12-28175-000

Air System Parts (372-C01704 or similar)
Description
STRAP-TIE, ANTI-VIB, M6.3, FIR TR
TUBE-NYL 12, 1/4", BLACK
ELB-90, 1/4PC+3/8MPT, GRY
SCHEM-AIR PP,PTO SUPPLY,DT12
INSTALL-PTO AIR SUPPLY, DT12

Qty.
5
15 ft.
1
—
—

Table 2, Air System Parts (372-C01704 or similar)
Pressure Protection Parts (46D-D61401 or similar)
Part Number
Description
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 PP,PTO SUPPLY,DT12

Page 2

Qty.
1
1
1
1
—

Western Star Service Bulletin, 09/23/2019

26-005

DT12 PTO Upfit
Constellation
Heritage
4700 Models
4800 Models

4900
> 5700
5900
6900

Models
Models
Models
Models

Pressure Protection Parts (46D-D61401 or similar)
Part Number
Description
D12-28175-001
INSTALL-PTO PREP KIT, DT12

Western Star
Service Bulletin

Qty.
—

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 (26-005), 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.

Ref No. *
82
83
84
85
89
90
91
93
94
95
96
97
98
99
100
101
102
103
104
106
107
108

Service Parts—PTO (342-C93063 or similar)
Part Number
Description
004 998 21 50
PLUG (M12X1.5)
947 267 00 76
SEAL
029 997 89 45
SEAL-PTO OUTPUT
013 994 29 41
CIRCLIP-INTERNAL
947 250 00 54
FITTING-AIR (-4 PTC HOSE)
947 540 00 97
SWITCH
000 990 12 80
COVER-FLANGE, SAE B
947 268 00 27
STUD-DRIVE FLANGE
016 990 46 82
SPACER-DRIVE FLANGE
DDE N910112008000 NUT
947 260 00 55
FLANGE-SPICER 1300
947 260 01 55
FLANGE-SPICER 1400
947 264 02 80
GASKET-PTO/TRANS
029 997 72 45
O-RING-PTO/TRANS
947 260 26 92
SHAFT, OIL PUMP DRIVE, W/ PTO,
DT12 A
947 260 25 92
SHAFT, OIL PUMP DRIVE, W/ PTO,
DT12 B
947 260 05 17
BEARING-PTO INPUT
947 265 00 36
CIRCLIP-EXTERNAL
947 260 01 52
PLATE-OIL PUMP COVER
DDE N910143010014 SCREW (MI0X35-10.9)
947 260 13 57
VLV-ELEC, KIT W/ SEALS/ PTO
947 260 04 17
FLANGE-SPICER 1300, 89 PTO, K
947 260 03 17
FLANGE-SPICER 1400, 89 PTO, K

Western Star Service Bulletin, 09/23/2019

Qty.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
1
1
1

Page 3

26-005
Western Star
Service Bulletin

Ref No. *
129
207

DT12 PTO Upfit
Constellation
Heritage
4700 Models
4800 Models

4900
> 5700
5900
6900

Service Parts—PTO (342-C93063 or similar)
Part Number
Description
000912 010219
SCREW SOCKET-HEAD (M10X35, 10.
947 264 01 07
PNEUMATIC VALVE PLATE

Models
Models
Models
Models

Qty.
2
1

* See Fig. 1.

Table 4, Service Parts

Page 4

Western Star Service Bulletin, 09/23/2019

26-005

DT12 PTO Upfit
Constellation
Heritage
4700 Models
4800 Models

4900
> 5700
5900
6900

Western Star
Service Bulletin

Models
Models
Models
Models

103

109

98

82
83

99

89

100
102

101

106

207
90

107
96

94

84

93

85
91

95
97
108
08/29/2019

81
f261523

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.

Western Star Service Bulletin, 09/23/2019

Page 5