Bulletin HY25-1806-M1/US
Owner’s Manual
252 Series
Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654 USA
12
To GM PTO
Connector
Connect to Solenoid
Valve
Connect to Pressure
Switch
Black Wire Loom
A
B
Part Number 329620X – MY2007 - 2014
Part Number 75-P-33 – MY2015 - Later
NOTE: After installing the PTO and harness, all trucks
will need to be reprogrammed by a GM dealer. The PTO
Load Feedback and PTO Engage Relay functions need
to be reset to ENABLE before the system will function
properly.
To change Stationary Preset PTO to Stationary Variable
PTO or Mobile Variable PTO the BCM (Body Control
Module) must be reprogrammed.
GM UI (Upfitter Integration) Bulletin #80 is recommended
to assist installers and end-users in understanding the
PTO system on these trucks. (www.gmupfitter.com)
10. Reattach the OE supplied transmission heat
shield to the bottom of the transmission. Torque
the bolts to 13 lbs-ft [17 Nm] (Fig. 13).
Model Year 2007-2015 GM 3600 Series
Wiring Harness - 252 Series
11. For 2007-2014 model year C/K Series 3500 trucks
equipped with Allison 1000, 2000/2500 transmission,
Chelsea wiring harness 329620X is required to
complete the truck to Power Take-Off (PTO)
interface. For MY2015 - Later, use 75-P-33.
12. Pressure switch connections (Fig. 14).
Grey w/green connector to grey pressure switch
connector.
13. Solenoid valve connections (Fig. 15).
Grey w/blue connector to white solenoid connector.
Fig. 15
Fig. 14
PTO Installation
GM 3600 Chassis (Continued)
Fig. 13
OE Supplied
Allison Installation
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