Form No. 3422-238 Rev B Belt Kit SGR-6 Stump Grinder Model No. 138-3121 Model No. 138-3125 Installation Instructions Safety Safety and Instructional Decals Safety decals and instructions are easily visible to the operator and are located near any area of potential danger. Replace any decal that is damaged or missing. decal117-4979 117-4979 1. Rotating belt—keep guard in place. decal119-4692 119-4692 1. Warning—shut off the engine; use both hand holds to lift the grinder.
Installation Loose Parts Use the chart below to verify that all parts have been shipped. Procedure 1 2 3 4 5 Description Qty. Use No parts required – Prepare the machine. No parts required – Remove the existing belt and cutter wheel. Wheel Tooth Kit Cutter wheel Bearing assembly Bolt (3/8 x 1-1/2 inches) Washer (0.40 x 0.81 x 0.11 inches) Locknut (3/8 inch) Guard plate Flange bolt (5/16 x 3/4 inch) Carriage bolt (5/16 x 3/4 inch) Locknut (5/16 inch) Front pulley Square key Washer (0.27 x 0.
2. 1 Loosen, or remove and retain, the 4 carriage bolts, 4 washers, and 4 locknuts securing the engine to the frame (Figure 2). Preparing the Machine No Parts Required Procedure 1. Park the machine on a level surface. 2. Engage the parking brake. 3. Shut off the engine. 4. Disconnect the spark plug wire from the spark plug. 2 g238897 Figure 2 Front fasteners shown Removing the Existing Belt and Cutter Wheel No Parts Required 3. Washer—0.38 x 0.73 x 0.07 inches (4) 2.
6. Remove the front pulley (Figure 4). 8. Remove the cutter wheel (Figure 6). g238744 Figure 4 1. Set screw 3. Square key 2. Front pulley g238743 7. Figure 6 Remove the guard plate (Figure 5). 1. Bolt—3/8 x 1-1/2 inches (4) 4. Locknut—3/8 inch (4) 2. Washer—0.40 x 0.81 x 0.11 inches (8) 5. Cutter wheel 3. Bearing assembly (2) 3 Installing the Wheel Teeth Parts needed for this procedure: g238746 Figure 5 1. Flange bolt—5/16 x 3/4 inch (3) 3. Guard plate 2.
Procedure 4 1. Installing the Cutter Wheel and Belt Slide a bearing assembly onto the shaft on both sides of the cutter wheel and follow the instructions provided with the bearing assemblies (Figure 7). Parts needed for this procedure: 2 Bearing assembly 4 Bolt (3/8 x 1-1/2 inches) 8 Washer (0.40 x 0.81 x 0.11 inches) 4 Locknut (3/8 inch) 1 Guard plate 2 Flange bolt (5/16 x 3/4 inch) 1 Carriage bolt (5/16 x 3/4 inch) 3 Locknut (5/16 inch) 1 Front pulley 1 Square key 1 Washer (0.
3. Install the guard plate using 2 flange bolts (5/16 x 3/4 inch), 1 carriage bolt (5/16 x 3/4 inch) and 3 locknuts (5/16 inch) as shown in Figure 8. 5. Apply thread-locking compound to the set screw, and secure the pulley with the set screw, washer (0.27 x 0.89 x 0.09 inches), and bolt (1/4 x 3/4 inch) as shown in Figure 9. Torque the setscrew to 14.9 to 17.6 N∙m (132 to 156 in-lb). 6. Apply thread-locking compound to the bolt (5/16 x 1-1/8 inch) and use the bolt, 2 washers (0.76 x 1.26 x 0.
8. Tighten the jam nut on the tensioner bolt (Figure 11). 10. Install or tighten the fasteners securing the engine to the frame (Figure 11). Note: Ensure that the engine does not twist in the chassis and the clutch pulley is aligned with the belt. 11. Install the belt guard using 2 bolts (3/8 x 1 inch) and 2 washers (0.38 x 0.75 x 0.08 inches) as shown in Figure 13. g247150 Figure 11 Front fasteners shown 1. Jam nut 3. Washer—0.38 x 0.73 x 0.07 inches (4) 2. Locknut—5/16 inch (4) 4.
5 Installing the Decal Model 138-3125 Only Parts needed for this procedure: 1 Decal Procedure Install a new decal over the existing decal on the wing bracket as shown in Figure 14. g240034 Figure 14 1.
