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Apparatus for tensioning a track chain of a tracklaying vehicle, such as a bulldozer, crawler loader or excavator, including a hydraulic cylinder for biasing a reversing chain sprocket which is rotatably mounted in a bearing that is displaceable in the vertical center plane of the track chain. The h

Apparatus for tensioning a track chain of a tracklaying vehicle, such as a bulldozer, crawler loader or excavator, including a hydraulic cylinder for biasing a reversing chain sprocket which is rotatably mounted in a bearing that is displaceable in the vertical center plane of the track chain. The hydraulic cylinder communicates with a cylinder chamber that contains a floating piston provided with a check valve for connecting the two parts of the chamber which are disposed on opposite sides of the piston, and for preventing backflow from the hydraulic cylinder. The piston is displaceable in the cylinder chamber between forward and rear stops to an extent which corresponds to that volume of hydraulic liquid which is to be displaced in order to relax the previously tensioned chain to an optimum chain tension. The cylinder chamber is connected adjacent to the rear stop to a supply line and adjacent to the front stop to a return line for returning fluid under a pressure corresponding to the pressure applied to tension the track chain. The supply line is connected to the reservoir when the piston has been moved into engagement with the forward stop.

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Apparatus for tensioning a track chain of a tracklaying vehicle such as a bulldozer, crawler loader, or excavator, said apparatus comprising: a tracklaying undercarriage including a frame and a track chain carried on said frame; drive chain sprocket means rotatably carried on said frame for driving

Apparatus for tensioning a track chain of a tracklaying vehicle such as a bulldozer, crawler loader, or excavator, said apparatus comprising: a tracklaying undercarriage including a frame and a track chain carried on said frame; drive chain sprocket means rotatably carried on said frame for driving said chain; reversing chain sprocket means with which said track chain is engaged; a hydraulic cylinder for biasing said reversing chain sprocket, which is rotatably mounted in a bearing that is displaceable in a vertical center plane that passes through the track chain, and hydraulic cylinder biasing said reversing chain sprocket to selectively tension and release the tension in the track chain and including a first cylinder chamber and a second cylinder chamber in fluid communication with said first cylinder chamber, a floating piston slidably received in said second cylinder chamber and including a check valve for connecting two parts of said second chamber which are disposed on opposite sides of the piston and for preventing backflow from said first cylinder chamber, the piston being displaceable in said second cylinder chamber between forward and rear stop means at respective ends thereof to an extent which corresponds to a volume of hydraulic liquid which is to be displaced in order to relax a previously tensioned chain to an optimum chain tension, said second cylinder chamber connected adjacent to the rear stop means to a supply conduit and adjacent the front stop means to a return conduit for returning fluid under a pressure corresponding to the pressure applied to tension the track chain, and valve means for connecting said supply conduit to a fluid reservoir when the piston has been moved into engagement with the forward stop means.