Usage:
(2) Torque for nut ... 300 ± 40 N·m (220 ± 30 lb ft)
(4) Torque for bolt for reverse idler ... 135 ± 15 N·m (100 ± 11 lb ft)
(5) Torque for nut ... 610 ± 65 N·m (450 ± 48 lb ft)
(7) Torque for 18 bolts ... 270 ± 25 N·m (200 ± 18 lb ft)
Adjustment Procedure For The Pinion Assembly
NOTE: This procedure must be done with the transmission gears removed from the tractor.
1. Assemble the pinion assembly, and install it on the end plate without shims (1). Tighten the cage bolts evenly, and make sure nut (2) is tightened to a torque of 300 ± 40 N·m (220 ± 30 lb ft).
2. Measure the distance (B1) from the end of the pinion head to the case side of the end plate.
3. Dimension (C) is a fixed dimension from the pinion bearing shoulder to the end of the pinion head. The nominal distance of dimension (C) is 58.38 mm (2.298 in). Stamped on the end of the pinion is the deviation from the nominal dimension. This deviation will be a plus or minus number and must be added to or subtracted from dimension (C).
4. Subtract dimension (C) from dimension (E) to get dimension (D). Dimension (E) is a fixed dimension from the pinion bearing shoulder to the centerline of the bevel gear and is 198.50 mm (7.815 in) in length.
5. Subtract dimension (D) from dimension (A) to get dimension (B2). Dimension (A) is the distance from the face of the transmission case to the centerline of the bevel gear. This dimension may be stamped either on the top near the bevel gear bore or on the front of the transmission case. The nominal distance of dimension (A) is 397.50 mm (15.650 in).
6. Subtract dimension (B2) from dimension (B1) to get the thickness shims (1) must be.
7. Remove the bolts from the cage, and install shims (1) the same thickness as the value found in Step 6. Install and tighten the cage bolts.
Adjustment of End Play for the Transmission Shaft Bearings
1. Install the assembled transmission shafts in the transmission case, and put the case in a vertical position (end plate side up). Install the end plate on the transmission case.
2. Install the two bearing cages on the end plate without shims (3) and check the end play with a dial indicator.
3. Rotate the transmission shafts back and forth several times to seat the bearings and remove the free movement (backlash).
4. End play for the transmission shafts must be 0.1 to 0.2 mm (.004 to .008 in).
5. If the end play is too much, decrease the thickness of shims (3). If too little end play is indicated, increase the thickness of shims (3).
Adjustment of the Free Movement (Backlash)
NOTE: The pinion assembly must be adjusted before backlash is adjusted.
1. Assemble bevel gear, shaft, bearings and cage. Tighten the bolts that hold the bevel gear to the shaft to a torque of 270 ± 25 N·m (200 ± .18 lb ft).
2. Install the bevel gear assembly in the transmission case with shims (6). Install the bolts to hold the cage to the transmission case. Tighten nut (5) to a torque of 610 ± 65 N·m (450 ± 48 lb ft).
3. Install a dial indicator so the lip of the indicator is on one tooth of the bevel gear. This can be done from the engine side of the transmission case.
4. Push the pinion toward the bevel gear, and hold it in place. Move the bevel gear clockwise and then counterclockwise. The free movement (backlash) will be the difference in the values read on the indicator.
5. Measure the backlash at four points around the bevel gear to find the smallest value of backlash.
6. The correct amount of backlash must be 0.23 + 0.10 -0.08 mm (.009 + .004 -.003 in).
7. If the measurement of backlash is too small, increase the amount of shims (6). If the measurement is too large, decrease the amount of shims (6).
Adjustment of Tooth Contact Pattern
NOTE: Make sure the free movement (backlash) is correct before the tooth contact pattern is adjusted.
1. Put a small amount of Prussian blue, red lead, or paint on the bevel gear teeth.
2. Turn the pinion counterclockwise and then clockwise. Check the marks made on the teeth of the bevel gear.
3. If the marks made on the teeth of the bevel gear look like the marks in Illustration A, the tooth contact is correct.
Illustration A
4. If the marks on the teeth of the bevel gear look like the marks in Illustration B, do the following:
A. Remove some of shims (1) between the bearing cage and the transmission case.
B. Do Steps 1 and 2 again
Illustration B
5. If the marks made on the teeth of the bevel gear look like the marks in Illustration C, do the following:
A. Add to the amounts of shims (1) between the bearing cage and the transmission case.
B. Do Steps 1 and 2 again.
Illustration C
NOTE: Several adjustments may be necessary before getting the correct tooth contact. Make sure the free movement (backlash) is correct before the tooth contact is checked. A change in the free movement (backlash) will give a change in the tooth contact. A change in the tooth contact will give a change in the free movement (backlash).
6. After getting the correct tooth contact, remove the Prussian blue, red lead or paint from the gears.