Bulletin HY25-1135-M1/US
Owner’s Manual
Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654 USA
34
This symbol warns of possible personal injury.
6 and 8-Bolt PTOs
PTO Shifting Procedure – Automatic Transmission
With Manual Shift PTO (Includes Air Shift)
NOTE: On automatic transmissions, the gears in the transmission turn when the transmission is in
neutral, therefore, gear clashing will occur if the Power Take-Off (PTO) is shifted into gear at this time.
With Converter Driven Gear
1. Shift transmission lever into any of the drive positions (this will stop transmission gear from
turning).
2. Shift PTO into gear.
3. Shift transmission into neutral (this will start gears turning).
With Engine Driven Gear
1. Shift PTO into gear before starting engine. This procedure should eliminate gear clash.
With PowerShift PTO
1. Engage PTO with engine at idle speed.
2. See transmission manufacturer’s instructions for special procedures.
WARNING: Use only wire control with PTO made for wire cable control.
Do not attempt to work on an installed PTO with the engine running. Make sure to block any moving
or raised device that may injure a person working on or under the truck. A lever or its linkage may be
accidentally moved causing movement of the device which could cause injury to a person near the
device.
Allison Installation
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