QAS Nail Drag

Parts needed for this procedure:

Note: Determine the left and right sides of the machine from the normal operating position.

1. Remove any attachment from the rear of the machine.

2. Back the traction unit into position in front of the attachment adapter. Lower the traction unit adapter.

   Note: Ensure that the locking lever is pivoted to the left (unlocked position) as viewed from the rear of the machine (Figure 3).

   

   Figure 3

   1. Locking lever
   2. Attachment adapter

3. Raise the traction unit adapter into the attachment adapter.

4. Pivot the locking lever to the right (locked position) as viewed from the rear of the machine so that it is standing straight up to lock the adapters together.

1. With the attachment mounted and secured on the traction unit, raise the attachment.

2. Measure the gap between the top washer and the spacer in the link assembly on the attachment adapter as shown in Figure 4.

   Important: The gap between the washer and the shoulder should be 0.060 to 0.080 inch (1.5 to 2.0 mm).

   

   Figure 4

   1. Adjustment nut
   2. Jam nut
   3. 0.060 to 0.080 inch (1.5 to 2.0 mm) clearance

Before operating the nail drag, grease it; refer to Lubricating the Machine.

Important: Failure to properly grease the unit will result in premature failure of critical parts.

• The amount the drag nails engage in the ground determines the scarifying depth.

• To adjust the amount the nails engage in the ground proceed as follows:

  1. Remove the lynch pins from the clevis pins (Figure 5).

     

     Figure 5

  2. Press down on the plates to increase the scarifying depth or release the plates to decrease the scarifying depth. Each hole changes the nail engagement 9/16 inch (14 mm).

  3. Install the lynch pins into the desired clevis pin holes; ensure that all the lynch pins are set at the same depth.

When the scarifying operation is completed, clean the machine thoroughly. Since this machine is used primarily in extremely abrasive conditions, the material should be flushed off after each use. If the machine is cleaned frequently, it can be cleaned with a stream of water from a hose with the nozzle removed. A high pressure stream could drive the sand into wear areas where it could act as a grinding compound.

Note: If the attachment adapter becomes stuck to the traction unit adapter, insert a prybar/screwdriver into the pry slot to disengage the parts.

Figure 6

1. Pry slot

The nail drag has bushings that must be lubricated regularly. The bushings are located in the frame hub; lubricate the grease fitting immediately after every washing, regardless of the interval listed.

Figure 7

Greasing the Attachment Adapter

If the locking lever on the attachment adapter does not pivot freely and easily, apply a light coat of grease to the area shown in Figure 8.

Figure 8