Jim - The pump drive seal is easy to change. Hardest part is getting the slotted coupling off the front end of the shaft. It screws onto the tranny countershaft with standard (right hand) threads. To remove: Engage the PTO then put a pipe wrench on it to keep it from turning. Now grab the coupling with another large pipe wrench - or place a suitable bar in the coupling slot - then tug or beat on the wrench. Once the coupling breaks free it will spin off easily by hand. Finally after the coupling is off, remove the 3 cap screws that hold the retainer to the tranny. The retainer and seal will then slide right off (the shaft will stay in place in the transmission). Tip: Drain the tranny lube level down to below the level of the countershaft before removing the seal retainer! See your CIH dealer for a replacement seal. Or take the IHC number off the old one and call your local bearing supplier. They can cross the number with a National Seal or Chicago Rawhide replacement - price is around $10 or so. Note - The replacement seal will be about 1/2 the thickness of the original. You can either get two seals and install them one behind the other. Or simply install a single seal and position it in the retainer so the seal lip rides on an unworn section of the shaft.
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