Bulletin HY25-1806-M1/US
Owner’s Manual
252 Series
Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654 USA
8
Allison Installation
Installing Pump to PTO
1. When installing the 252 Series on either the Allison
or Aisin Transmission one recommendation is to
install the Commercial Pump prior to Power Take-Off
(PTO) installation.
2. If the Commercial Pump was ordered with the Power
Take-Off it will come with a Pump Installation Kit
329296-4X. This kit will include two bolts
(378431-11) for mounting the pump to the PTO and
a small packet of anti-fretting grease (379688).
3. Before installing the pump to the PTO apply grease
to the PTO female splined shaft and to the male
pump shaft.
4. Install to pump to the PTO using the bolts provided
with the kit. Torque the two pump bolts to 32-37
Lbs-ft [45-50 Nm].
5. You are now ready to install the Power Take-Off to
the Transmission.
6. Steps 3 & 4 should be followed even if the pump is
not installed at this time, but after the PTO is
mounted to the transmission.
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