What is the correct pinion bearing preload?
Depending on the style of the assembly, either a crush collar or shims can be used to adjust pinion depth. Once the pinion depth has been set, pinion preload must be applied while rotating the pinion. For used bearings, set preload at 15 in. -lbs.; with new bearings, set preload with 25 in.
How tight should pinion nut be?
Be careful a quarter turn past optimum is way too tight. You only want 12-20 in. lbs of torque on the free spinning pinion. If you go too tight, the only thing to do is take it apart and crush a new sleeve.
What happens if pinion preload was set incorrectly?
The pinion gear rotates at driveshaft speed and can mimic a driveshaft speed-related vibration. Improper pinion bearing preload can cause what appears to be a pinion seal leak, but the seal is fine, the pinion gear is moving vertically, horizontally, or diagonally as is rotates.
How do you check and adjust pinion bearing preload?
Use an inch-pound torque wrench to check the preload. If the preload is too loose then remove the shims so that the bearings will be tighter against the races and increase the preload. If the preload is too tight, then remove the pinion gear and add shims so that the bearings will not be as tight against the races.
What is pinion preload?
Pinion bearing preload is the tension placed on the pinion gear’s tapered bearings. A collapsible spacer is used to obtain the specified amount of pressure or preload. This spacer is placed between the bearings. This preload prevents the sideways thrust that moves the pinion gear to the outside edge of the ring gear.
Can you over tighten pinion nut?
If you overtighten the pinion nut, you need to remove the pinion and replace the crush sleeve.
How is pinion bearing preload checked and adjusted?
PINION BEARING PRELOAD. – The pinion bearing preload is frequently adjusted by torquing the pinion nut to compress a collapsible spacer. Then measure the pinion preload by turning the pinion nut with an inch-pound torque wrench. When a solid spacer and pinion nut are used, shims control pinion bearing preload.
Why is preload needed in a rear axle?
A slight preload bearing setting assures that proper gear tooth contact is maintained between the pinion and ring gear. This minimizes gear wear and extends the tooth life of both gears. Debris in the axle system is reduced when gear wear is minimized.
How do I check my pinion preload?
Does pinion preload effect backlash?
Note: If carrier preload is too little, carrier will move away from pinion under load (squirm or deflect), increasing backlash. This could lead to insufficient gear tooth contact, resulting in chipping/breaking of gear teeth.
How do you check pinion bearing preload?