Automatic dump trailer leveler

An automatic leveler for a vehicle having a tilting dump box, comprising:

• oppositely disposed first and second hydraulic leveling strut means, for laterally leveling the dump box for dumping operations when the vehicle is parked on laterally sloping terrain;
• hydraulic pump means communicating hydraulically with said first and second leveling strut means, for initially extending and taking up slack in each said leveling strut means and for providing leveling extension of each said leveling strut means;
• valve means hydraulically communicating with said pump means and each said leveling strut means, for selectively extending each said leveling strut means;
• delay switch means communicating with said pump means, for delaying activation of said pump means for extending either of said leveling strut means;
• and
• tilt switch means communicating with said valve means, for signaling said valve means for selectively extending and retracting either of said leveling strut means according to any predetermined lateral tilt detected by said tilt switch means.

A dump vehicle and an automatic leveler therefor, comprising in combination:

• a vehicle having a selectively tilting dump box, with said vehicle having a frame, at least one axle disposed beneath said dump box and said frame, and resilient suspension means disposed between said at least one axle and said frame;
• opposite first and second hydraulic leveling strut means disposed between said vehicle frame and said at least one axle, for laterally leveling said dump box for dumping operations when said vehicle is parked on laterally sloping terrain;
• a low pressure hydraulic pump communicating hydraulically with said first and second leveling strut means, for initially extending and taking up slack in each said leveling strut means;
• a high pressure hydraulic pump communicating hydraulically with said first and second leveling strut means, for providing leveling extension of each said leveling strut means;
• valve means hydraulically communicating with said high pressure pump and each said leveling strut means, for selectively extending each said leveling strut means;
• delay switch means communicating with said pump means, for delaying activation of said pump means for extending either of said leveling strut means;
• and
• tilt switch means communicating with said valve means, for signaling said valve means for selectively extending and retracting either of said leveling strut means according to any predetermined lateral tilt detected by said tilt switch means.