Start dozing from the front of the dozing zone. As seen from the picture, if working on level ground, dozing should start at the front. This reduces the distance that material must be pushed. The dozers blade is also always full by using a downward grade. Slot dozing is done by first building a pair of windrows with the spillage of several passes. As shown in figure 11-27, the windrows serve as barriers to prevent spillage around the dozer blade ends. Under favorable conditions, slot dozing can increase production up to 50 percent.

Slot dozing, which consists of dozing repeatedly in the same tracks, will increase production. The deeper the slot, the greater the increase in production. Obviously this will disrupt the surface of the pile; however it does provide maximum production. Edition 44 29-3 Production Factors Stockpile Coal Handling Estimating Hourly Production Slot.
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slot dozing

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Slot Dozing Technique

′slät ‚dōz·iŋ] (engineering) Dozing

Slot Dozing Trench Method

A method of moving large quantities of material with a bulldozer using the same path for each trip so that the spillage from the sides of the blade builds up along each side; afterward all material pushed into the slot is retained in front of the blade.

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<a href='https://encyclopedia2.thefreedictionary.com/slot+dozing'>slot dozing</a>

Doze Front to Back

The most effective way to bulldoze volumes of dirt is to start two tractor lengths from the end of the intended cut. Fill the blade as quickly as possible in first gear - usually within two tractor lengths - and start a spoil pile. On the second pass, back up two tractor lengths further than the start of the first pass, fill the blade again, then carry the load through the slot created in the first pass. Repeat the process, carrying the load further with each pass, until the slot stretches the length of the intended cut. The walls of the slot can extend the tractor's blade load by as much as 30 percent.

Start at the Spoil

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Front-to-back slot dozing cuts undercarriage costs as it improves productivity. Driving in reverse causes the worst track wear. Working front to back, you only have to reverse the tractor the distance of the previous push plus two tractor lengths. Compared to backing up the entire length of the cut, this reduces reverse operation - by 38 percent in the example of a 240-foot cut. It reduces operating costs, and increases dirt-pushing time.

Steep hourly cost makes operating efficiently more important to crawler dozers than most other construction equipment. The cost is largely associated with undercarriage wear, so the best dozer operators make every move count whether they're doing production earth moving, finishing, or clearing land.

Common production dozing mistakes

Some of the best ideas for improving dozer productivity defy operators' assumptions.

'A lot of operators who are doing production dozing think they should make long cuts. They want to see dirt boil or roll in front of the blade,' says Brad Van De Veer, senior product consultant at Caterpillar's Edwards Demonstration/Application Center. 'In reality, the blade will only hold so much dirt. Once it's full, you start losing dirt off both sides of the blade, leaving windrows that will have to be moved again. It wastes horsepower and fuel, and it can cause track slip and undercarriage wear.

'You should be able to get a full load on the blade in two lengths of the tractor at the most - and that applies to any size tractor. Once the blade is full, you stop cutting and slide the dirt in front of the blade.'

Short, aggressive cuts set up what is perhaps the most energy-saving way to doze dirt - what Caterpillar calls 'front-to-back or slot dozing.'

'You start one to two tractor lengths back from where you're going to move the dirt, instead of on the opposite side of the field,' says Van De Veer. 'Fill the blade and start a pile or fill the area.'

Bulldozing mistakes that can cut down on operating efficiency include:

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Not allowing enough berth between the bulldozer and rocks, logs, debris, and ditches.
Spinning the track; this can create ruts in material.
Starting in a high gear when feeding the blade into the ground.
Partially loading the blade, making it more difficult to control.

Put it into action: Best bulldozing practices

The next step is to back up one to two tractor lengths behind the start of the first cut, fill the blade, and slide the load, or carry it, through the slot created by the first pass and deposit it on the spoil pile. Use first gear to aggressively fill the blade. In small and medium sized tractors, shift up to second when sliding the load. Repeat the process, sliding a full blade load through the slot further with each pass.

Working in the slot increases blade load by as much as 30% and prevents material from falling from the blade.

Front-to-back dozing cuts undercarriage costs. Instead of backing the entire length of the cut after each push, you only reverse the tractor the distance of the previous push plus one or two tractor lengths.

'Running in reverse causes the most undercarriage wear, and it's the most unproductive time in the work cycle,' says Van De Veer. 'Working front to back, you reduce the amount of reverse operation, which decreases operating costs and increases productivity.'

Van De Veer says slots can be dug as deep as the blade is high.

After the first slot is completed, back up to about two tractor lengths from the spoil and move over, leaving about one-third of a blade width between the edge of the blade and the first slot. This berm will hold material in front of the blade on the second slot.

After the slots are cut to the desired grade, the work pattern reverses for clearing the berms.

'You want to work from the rear of the cut, or the opposite end from the spoil, rather than front to back,' says Van De Veer. 'Load up the blade quickly, and use blade tilt to steer into one of the slots to carry the load to the pile or fill.'

A crisscross pattern will help keep the cut level: If you slide the load up the left slot on the first pass, swing into the right slot on the second pass, and then back to the left slot