hard bar

Means replacing the spring with a ridgid beam, usually a cast or fabricated I-shaped beam with tapered ends. Not recommended if mounted directly to the oil pan such as on D2's and D4's.

On the contrary.........Dozer is much easier to keep on grade with a hard bar and I have never noticed our D69U riding rougher with the hard bar instead of the spring.

My old Allis HD11 has had the spring swapped out for a shop-built bar at some point in its' life. It doesn't match the parts book for a rigid bar. In the parts book, the rigid bar is bolted solid to the track frames and the main frame. This shop-built one uses the original pivots on the track frames and main frame to still allow each track to pivot up and down a certain degree.

How are these suppose to be set up? (Not necessarily AC, but on dozers in general.) Is the main frame and both track frames to be 1 rigid unit? Or are the track frames to be able to pivot up and down (1 goes up, other side goes down)? Or are both designs common?

Andrew

Actually the termanology gets misused. The solid equalizer bar (that replaces the spring) is still allowed to oscillate with the track frames. The "hard bar" is more commonly referred to as ridged where the track frames are bolted and oscillation is not allowed such as on tracked loader applications.

Actually the termanology gets misused. The solid equalizer bar (that replaces the spring) is still allowed to oscillate with the track frames. The "hard bar" is more commonly referred to as ridged where the track frames are bolted and oscillation is not allowed such as on tracked loader applications.

ahhh!! Thanks for the info!

Andrew

they run hard bar in side boom's too. but the one i have Sean where convention to 572 which make sense that you don't wont stuff moving around when lifting.

aah never knew this about the sidebooms that they are solid made at the equliser bar, any one has pictures of this constuction??