D6D TRACTOR POWER TRAIN – Bevel Gear And Pinion Shaft Settings (Direct Drive And Special Application)

Bevel Gear Shaft Bearing Preload (Direct Drive And Special Application)


NOTICE

Keep all parts clean from contaminants. Contaminants put into the system may cause rapid wear and shortened component life.


1. Install the bevel gear shaft without the bevel gear if the transmission is in the machine. Install the bevel gear shaft with the bevel gear if the transmission is out of the machine.

2. Install the left bearing cage (as seen from the rear of the machine) and a full package of shims. Install the bolts without lockwashers that hold the cage in position. Tighten the bolts evenly. The thickness of a full pack of shims is 3.02 to 3.18 mm (.119 to .125 in.).

3. Install the right bearing case without shims. Install four bolts without lockwashers the same distance apart that hold the cage in position. Do not tighten the bolts.

4. As the bevel gear is turned slowly, tighten the bolts in the right bearing cage until the end play of the bevel gear shaft is zero. Use tool (A) to measure the end play.

5. Use a feeler gauge (1) to measure the distance between the flange of the bearing cage and the face of the flange of the bevel gear case at four places next to the bolts. Find the average of the dimensions measured. Make a record of this dimension.

6. Remove the left bearing cage.

7. Install the left bearing cage with an amount of shims from another full shim pack to equal the average distance measured in Step 5 less 0.13 mm (.005 in.).

8. Install the nut for the steering clutch hub on the end of the bevel gear shaft. Check the torque needed to turn the bevel gear shaft. The correct torque to turn the bevel gear shaft is 3.4 to 4.5 N·m (30 to 40 lb in.).

Gear Clearance (Backlash) Adjustment (Direct Drive And Special Application)

NOTE: The steering clutches and steering clutch hubs are removed.


NOTICE

Keep all parts clean from contaminants. Contaminants put into the system may cause rapid wear and shortened component life.


1. Push the pinion shaft as far as possible toward the front of the transmission.

2. Install a wood block between the bevel gear case and the pinion shaft. Make sure the pinion shaft does not turn.

3. Install tool (A) in the bevel gear case as shown. The tip of the indicator must make contact with one of the teeth on the bevel gear.

4. Move the bevel gear backward and forward. The gear clearance (backlash) is the difference in the measurements read on the indicator.

5. Measure the gear clearance (backlash) at four places around the bevel gear to find the smallest gear clearance (backlash) measurement.

NOTE: The pinion shaft must be held toward the front of the transmission for a correct measurement.

6. The correct gear clearance (backlash) measurement is 0.20 mm ± 0.10 or -0.08 mm (.008 + .004 in or -.003 in.). If the smallest gear clearance (backlash) measurement is too large, remove shims from the left bearing cage and install them behind the right bearing cage. To make the gear clearance larger, remove shims from the right bearing cage and install them behind the left bearing cage.

NOTE: The preload on the bearings for the bevel gear shaft will not change if shims are moved from one cage to the other if the total thickness of shims is the same.

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