Attachments - 14081

Figure 11-8.-Carrier rollers.

Dozer Blades

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure 11-12.—Checking track adjustment. Figure 11-10.-Manual track adjustment. Figure 11-11.-Hydraulic track adjuster. adjusted hydraulically with a grease gun. Grease is pumped into the yoke cylinder and extends it until enough tension is placed on the recoil spring to remove the slack from the track. Tension is relieved by loosening the vent screw located next to the adjustment fitting. NOTE: Do NOT lubricate this fitting when per- forming daily operator’s maintenance. The track adjuster fitting should only be greased when the tracks require adjustment. Track Adjustment.— To determine proper track tension, position the dozer on a hard surface. Then place a straightedge over the front carrier roller and idler with all slack removed from the rest of the track. The tension is correct when the measured distance is as shown in figure 11-12. Track tension should be suitable for the type of area you arc working in, such as tighter for rock and looser for sand and snow. However, if the tracks are adjusted too tightly, there will be too much friction between the pins and bushings when the track links swivel, as they travel around the sprocket and front idler. This friction causes the pins, bushings, links, sprocket, and idler to wear rapidly. Friction in a tight track also robs the tractor of needed horsepower. Tracks that are too loose fail to stay aligned and tend to come off when the tractor is turned. As a result, the idler flanges, roller flanges, and the sides of the sprocket teeth wear down. A loose track will whip at high speeds, damaging the carrier rollers and their supports. If loose enough, the drive sprockets will jump teeth (slide over the track bushings) when the tractor moves in reverse. Should this happen, the sprocket and bushings will wear rapidly. NOTE: Checking and performing track adjust- ments arc the opcrator’s responsibility. Lubrication. — The track pins and bushings are hardened and require no lubrication. Many roller idlers arc equipped with lifetime seals that are filled during assembly and require no lubrication. However, track rollers, carrier rollers, and idlers equiped with grease fittings must be lubricated on a schedule based on the manufacturer’s specifications. NOTE: Fittings should be cleaned before lubri- cating to prevent forcing dirt and grime into the bearings. ATTACHMENTS The most common type of dozer attachment is the dozer blade, a heavy, rectangular steel blade, that is on 11-5

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