Track Adjuster Grease Valve 4255055R Fits JD 240DLC 135D 270DLC 350GLC 130GOne New Aftermarket Replacement Track Adjuster Grease Valve Fits John Deere (Fits JD) and Hitachi Excavators This aftermarket replacement track adjuster grease valve fits the track adjuster assembly on the undercarriage of Fits John Deere and Hitachi excavators. The valve (also called a grease nipple or grease check fitting) allows grease to be injected into the track adjuster cylinder to tension the tracks, while preventing grease from escaping under