I'm working on a real fixer 450B Dozer. When shimming the track carrier to center the sprocket on the rear roller, is the rear track cross bar retainer suppose to be tight against the outer hub or have a little play? This machine had 2 shims and badly wore the edge of the old sprocket after about 700 hrs (and bottom rollers worn to the point one was flopping around grinding into the track carrier). The parts book says about 6 shims are needed. I found eight centered the sprocket perfect but after tightening there's a slight gap between the retainer and outer hub of about one shim or less. One more may move it slightly off center. Should that retainer be good and tight even if off a little or does the front cross member hold it in place once you tighten the bolts? This is new to me, i don't see what prevents the carrier from moving inward unless its the front crossbar, obviously the retainer stops it from moving outward.After looking at the other side still with track on, it too had 2 shims and the track chain not centered on the sprocket or the front idler, with edge wear on the idler. Then a look at the front cross member bolts--all three missing from the side frame! bottom bolts loose only hand tight. Back to the parts book, calls for 5/8 by 2" bolts. Problem, machine has the 6405 six way blade and the inner mount frame doesn't allow clearence to replace the 2" bolts. 1 1/2" will squeeze in but not enough thread for nut. No one had grade 8 in 1 3/4 to try that. I wonder how they got out being there is not enough clearance. Maybe a side frame replacement, botched and just let her go when the clearance problem was discovered?-You just never know. Next problem, back on the other side the bolt was missing out of the large pin that passes thru the blade frame above the front cross bar. A look from behind the upper roller into the blade frame and there was the pin wedged as far back as it could travel--About 6 inches. The holes were misaligned by about 1/4" so the pin couldn't simply be driven back in place. After loosing the blade frame bolts and jacking up the C frame finally it aligned about an hour of driving with a punch and jacking around ( it actually had been repainted like that hampering movement of the pin.) At least frame wasn't bent and realigned. Ended the day by removing the rear cross bar retainer and having some of the threads pull out, maybe a longer bolt will do...twas not a good day. Wish i hadn't taken the job. Also it will need a loose blade repaired, holes for cylinder pins where bushings go slightly egg shaped. I'll cover that in another post, enough to do now and i forgot the hydraulic leaks too. Any advice/support appreciated. I know the loose blade is common.
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