Usage:
12G (61M, 3WC, 3PL),
120G (87V, 4HD, 82V, 11W, 61W, 2AB),
130G (74V, 12W, 59K),
140G (72V, 13W, 5MD, 50H),
160G (4JD) Motor Graders
Reference: Special Instruction; SEHS8985; "Using the 1U-8660 Boring Bar Hydraulic Unit and Attachments". Special Instruction; NEDG5601; "Boring & Welding Equipment Selection Guide".
Sleeve bearings can be installed in the circle assembly and moldboard rail bracket to control moldboard movement. The sleeve bearings can also be replaced when they are worn.
Use the information in the reference material and following method to install the sleeve bearings.
Illustration 1. (A) 57.075 ± 0.025 mm (2.2470 ± .0010 in) diameter, surface texture F.
1. Increase the size of the hole in the 8W-4066 and 8W-4067 Moldboard Rail Brackets to dimension (A) as shown in Illustration 1.
2. Press a 104-8655 Sleeve Bearing into the hole in the moldboard rail brackets.
NOTE: The sleeve bearings can be chilled or frozen to make installation easier
Illustration 2. (B) 57.075 ± 0.025 mm (2.2470 ± .0010 in) diameter, surface texture F. (C) 72.0 ± 1.0 mm (2.83 ± .04 in) deep. (1) 6G-2949 Brace. (2) Circle assembly beam.
3. Increase the size of the holes in the circle assembly beams to the dimensions (B) and (C) as shown in Illustration 2. Locate the boring tool so the cut is concentric
NOTE: When increasing the size of the hole in the circle assembly beams, make sure the boring tool is concentric with the 6G-2949 Brace (1). The increased hole size should not leave a thin wall in the brace or cut into the weld that holds the brace to the circle assembly beams (2). The outside diameter of the 6G-2949 Brace is 76.20 ± 0.53 mm (3.000 ± .021 in) and the tube wall is 12.70 ± 2.65 mm (.500 ± .104 in) thick.
4. Install a 2A-7089 Sleeve Bearing in each of the enlarged holes in the circle assembly beams.
If desired, 3B-8489 Grease Fittings can be installed in each of the bearings and the Locations X shown in the illustrations. The fittings should be outside of each moldboard bracket and on the inside and on top of the circle beam tube.
Drill an 8.7 mm (.34 in) diameter hole through the bearing. Tap the hole using a 1/8-27 NPSF tap.