Stanley Black & Decker DH9000, DH3500, DH1500 user manual Adjusting Impact, Daily Inspection

OPERATION

GENERAL TECHNIQUE FOR BREAKING SLAB

Rest the drop hammer in a vertical position on the concrete to be broken. The skids should be just resting on the concrete with some of the weight taken by the carrier. If a crack appears in the top surface of the concrete you can be sure it is broken all the way through.

Actuate the hydraulics and the drop hammer will start to cycle. As the concrete cracks or breaks move the carrier. It is best to move while the hammer is raised and pause momentarily as the hammer strikes.

Generally all that is required is to hit the concrete until it cracks and then move 6-12 inches /150-300 mm. Sitting in one place will pulverize the concrete and eventually the hammer will hit the column buffers. This is felt as a hard jarring action through the machine.

With skid steers movement can be in any direction but gener- ally moving in a reverse direction provides the best control. On excavators setting the machine down and moving in arc with the slew drive is usually the quickest method.

It is important to keep the drop hammer as vertical as possible during operation as this provides the greatest impact.

When breaking thinner concrete, the drop hammer may hit too hard and punch completely through. In this instance the hammer sticking into the concrete and stopping the carrier traveling can slow production. If this occurs adjust the impact of the drop hammer as described below.

ADJUSTING IMPACT

12 DH USER MANUAL

1.Tip the drop hammer to a horizontal position.

2.Gradually move the drop hammer past horizontal until the weight slides forward. This can be done in a controlled manner by shaking the weight out using the curl lever.

3.Allow the Hammer to slide out until it hits against the Safety Pin.

4.Return the drop hammer to horizontal and rest it on the ground and Shut the carrier off.

5.On the under-side of the Hammer remove the Bolt and Peg Locking Plate that hold the Hammer Peg.

6.Remove the Hammer Peg and replace it in the next hole.

Tighten to 180 ft/lbs/240 Nm for the DH3500 and DH9000, for the DH1500 tighten to 140 ft lbs/190 Nm with the Bolt and Peg Locking Plate. See Figure 3 below.

Hammer Peg	Hammer Safety Pin
Hex Head Setscrew
Peg Locking Plate

Hammer

Figure 3. Hammer Adjustment

7.Restart the carrier and SLOWLY raise the drop hammer until the Hammer slides down the column.

MAINTENANCE

It is recommended that only genuine Stanley parts are used. Genuine Stanley drop hammer parts are all checked for allowable tolerances.

Although the drop hammer is a simple machine, it is subject to severe stresses and shocks during normal operation. A five-minute daily check will ensure that your drop hammer remains in good condition and will prevent unscheduled down time.

DAILY INSPECTION

Check that all the mount plate bolts that connect the drop hammer to the carrier are tight and torqued to the recom- mended value.

Check that the motor flange bolts are tight and secure.