User Manual
Page 11 of 39 DETROIT DDC-ENG-MAN-0001
PTO OUTPUT SPEED CALCULATION
Since the DT12 Rear PTO is driven by the countershaft inside the transmission, there are two effective gear
ratios possible, low neutral or high neutral. The low neutral and high neutral are referred to as “split low” and
“split high” respectively.
There is a data code module in SpecPro that allows for operation to be set to either “split low” or “split high”.
This functionality allows the operator to engage the PTO at the desired gear ratio for proper operation. The
PTO ratio, once chosen, will be active at the time of the PTO engagement, Split Low/High cannot be
changed by the driver in the cab.
The default data code for the DT12 Rear PTO is “split low” upon PTO activation.
The available options in SpecPro are:
85P-001: PTO LOW NEUTRAL
85P-002: PTO HIGH NEUTRAL
85P-998: NO PTO NEUTRAL GEAR SELECTION
The default operation for the DT12 Rear PTO is “split low” upon PTO activation. However, parameterization
in the CPC allows for operation to be set to either “split low” or “split high”. See the GHG14/17 DDEC13
Electronic Controls Application and Installation Manual (DDC-SVC-MAN-0127) Section 8.28 Throttle
Control/Governors via www.DTNAconnect.com for specific parameter programming information.
Rear PTO speed can be calculated by using the PTO output speed summary table below (the released of the
1:1.83 ratio is TBD at this time):
Table 2: Rear PTO output speed summary table.
DT12 Variant "Split" Engine : PTO Percent Engine : PTO Percent
Split Low 1
:
0.78 78% 1
:
1.06 106%
Split High
1
:
1
100%
1
:
1.36
136%
Split Low 1
:
1 100% 1
:
1.36 136%
Split High 1
:
1.28 128% 1
:
1.74 174%
Split Low 1
:
0.78 78% 1
:
1.06 106%
Split High
1
:
1
100%
1
:
1.36
136%
Split Low 1
:
1 100% 1
:
1.36 136%
Split High 1
:
1.29 129% 1
:
1.76 176%
Split Low 1
:
0.71 71% 1
:
0.97 97%
Split High
1
:
0.92
92%
1
:
1.25
125%
Split Low 1
:
0.92 92% 1
:
1.25 125%
Split High 1
:
1.18 118% 1
:
1.61 161%
Split Low 1
:
0.94 94% 1
:
1.28 128%
Split High 1
:
1.21 121% 1
:
1.65 165%
DT12-OVX (OD)
NOTE: Ratios Greater than 1:1, or over 100% ---> PTO spins faster than engine
DT12-OHL (OB)
DT12-DH (DA)
DT12-OH (OA)
DT12-DHE/DV (DC)
DT12-OHE/OV (OC)
PTO Ratio (1
:
1) PTO Ratio (1
:
1.32)
DT12-DHL (DB)