Bulletin HY25-1806-M1/US
Owner’s Manual
252 Series
Parker Hannifin Corporation
Chelsea Products Division
Olive Branch, MS 38654 USA
37
Due to the normal and sometime severe torsional vibrations that Power-Take-Off units experience, operators
should follow a set maintenance schedule for inspections. Failure to service loose bolts or Power-Take-Off leaks
could result in potential auxiliary Power-Take-Off or transmission damage.
Periodic PTO MAINTENANCE is required by the owner/operator to ensure proper, safe and trouble free operation.
Daily: Check all air, hydraulic and working mechanisms before operating PTO Perform maintenance
as required.
Monthly: Inspect for possible leaks and tighten all air, hydraulic and mounting hardware, if necessary. Torque all
bolts, nuts, etc. to Chelsea specifications. Insure that splines are properly lubricated, if applicable.
Perform maintenance as required.
With regards to the direct mounted pump splines, the PTO requires the application of a specially formulated
anti-fretting, high pressure, high temperature grease. The addition of the grease has been proven to reduce the
effects of the torsional vibrations, which result in fretting corrosion on the PTO internal splines as well as the
pump external splines. Fretting corrosion appears as a “rusting and wearing” of the pump shaft splines. Severe
duty applications, which require long PTO running times and high torque may require more frequent regreasing.
Applications such as Utility Trucks that run continuously and are lightly loaded also require frequent regreasing
due to the sheer hours of running time. It is important to note that service intervals will vary for each and every
application and is the responsibility of the end user of the product. Chelsea also recommends that you consult
your pump owners manuals and technical services for their maintenance guidelines. Fretting corrosion is caused
by many factors and without proper maintenance; the anti-fretting grease can only reduce its effects on
components.
Chelsea offers the grease to our customers in two packages. The first is a 5/8 fluid ounce tube (379688), which
is included with every applicable PTO, and the second is a 14-ounce grease cartridge (379831). Chelsea also
offers greaseable shafts for select output designators.
Warranty: Failure to comply entirely with the provisions set forth in the appropriate Owner’s Manual will
result in voiding of ALL Warranty consideration.
Power Take-Off Maintenance
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