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Post Onsite · Hydraulics
66-P-22
In stock · ships from Knoxville
This is a shifter piston for a power take-off (PTO) unit, most likely manufactured by Parker Chelsea based on the part number format and the similar 66-P-11 shifter piston.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
We don't publish fitment for this part yet. Rather than guess, get it confirmed against your truck in under a minute.
It actuates the engagement mechanism that connects the PTO to the transmission, powering auxiliary equipment like hydraulic pumps, dump bodies, or winches. Over time, internal seals can fail or the piston surface may wear, causing hard shifting, PTO pop-out, or engagement failure, at which point replacement is needed.
Part Number: 66-P-22
PISTON
Unit: ea
Dealer: Post Onsite
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