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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 450 6 way blade bushings/pins

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Dozerboss

06-23-2004 22:45:35

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JD 450 6 way hydraulic blade # 6405.
Has anyone a suggestion for repair of blade pin/bushing bores on the dozer frame when they have become out of round? Can they be drilled oversize and sleeved back to size? Would an oversize bushing hold up? The JD dealer says there are inserts that can be put in frozen that will warm and lock in place. He couldn't recommend anyone, "just try a machine shop". I know this is a common problem as i have seen many JD 450's for sale with loose blades and cracked C frames. Has anyone found a way to restore the bores back to size? I have found a place that sells the main cross frame for the angle and tilt cylinder for $1500, that would fix half the problem. That still leaves wear on the main frame bores. Has anyone found a way to restore the bores back to size? Replaceing the main C frame would probably get very expensive. Thanks.

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GLewis

06-25-2004 05:24:01

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Re: JD 450 6 way blade bushings/pins in reply to Dozerboss, 06-23-2004 22:45:35

I assume you are working with a regular C-Frame dozer. Originally the dozer arms have two individual short pins per side. As a repair we have used a bridge reamer to true holes a close as possible and then we would turn a pin to match the oversize holes. The pin extends through the top and bottom bores instead of the two separate pins. In this way the long pin will have less movement even if the bores are not perfect. The bridge reamers can be purchase from any industrial supply house and you can do the work in the field and just have a machine shop make the pins or purchase cold drawn round which comes in 1/16" increments. We use regular 1018 cold rolled for the pins so they wear before the holes and if necessary can be renewed. This method saves time and money as long as the holes are not completely gone.

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Steve

06-24-2004 03:32:33

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Re: JD 450 6 way blade bushings/pins in reply to Dozerboss, 06-23-2004 22:45:35

We rehab those blades all the time. We build them up and bore them back out to size. That's about the only way to do it and have it last. The oversize with bushing idea is ok for areas where there is enough meat to bore out considerably larger and install a thick wall bushing with a heavy press fit. If the bushing is not thick enough, it will gradually distort and eventually fall out even if its welded in. If things are totally wiped where even build up is'nt feaseable, then we cut the bosses right off and install new ones.

P&D Mechanical

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Dozerboss

06-26-2004 19:52:59

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Re: Re: JD 450 6 way blade bushings/pins in reply to Steve , 06-24-2004 03:32:33

Thanks for the input from you both. The problems are the bores where the hydraulic cylinders mount to the main C frame and the main cross frame. The cylinders are mounted with a single pin on each end. On the main cross frame the angle cylinder rods have eye type ends which the pin passes thru. As they ride on these pins there is about 1/2" space on both sides of the rod end. It occured to me I could fix that end of the problem by having collars and pins made to fit between the rod ends and welding the collars to the main cross frame. Just looking at it, it appears all the movement is in the channel on the back of the blade where your blade keeper and shims are bolted on. It seems to me the 1 inch between the cylinder rod end and the pin boss isn't needed, or am I missing something? Wish I had a picture to upload for visualization. P & D, I'm assuming by building up you weld the bores then redrill them, is that correct? And the bosses that you weld on, do you sell them? I see your crawler parts are not on the site.

I think the pin bores are close to 1-5/8" going by the OD on the angle cylinder pin bushings. The lift cylinders have some wear but new bushings would take up a lot of the slack there. The angle cylinders and tilt cylinder bores all have the most wear. Thanks for any further input anyone can add to this heavy duty problem.

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