Can you fit rubber tracks to a komatsu pc05-5 with steel tracks?

Yes measure min and max on the track tensioner grease push rod. to answer this question correctly , if your machine is an early steel track model you have to renew the rollers as the ones for steel tracks are not wide enough or deep enough for rubber.You also have to cut the ridge off the idlers with a steel cut off saw because the rubber tracks will not ride the idler correctly .