SKF 457423 Guide Rapide

Système de contre-écrou de roulement de roue

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SKF Wheel bearing lock nut system

installation and adjustment procedures

The SKF spindle nut locking system used on preset hub designs should be installed following the current torque specifications

NOTE

of the preset hub manufacturer's instructions.

This instruction sheet is for manual adjustment of taper roller bearings. Failure to follow these instructions when doing

WARNING

adjustments on conventional wheel ends may cause the wheel to come off and cause bodily injury and/or property damage.

Ensure all wheel end components are assembled and pre-lubricated, if required, to their respective manufacturer's

warranty, quality, care, and assembly instructions. Care must be taken not to lubricate spindle threads. False

torque readings will occur if spindle threads are lubricated.

a) Ensure all bearings, hub bores and spindles are cleaned, inspected and prepared per TMC RP622.

b) Ensure that the spindle keyway is clear of interference all the way to the bearing journal and that the spindle threads

are without damage and functional all the way to the bearing face.

Install the wheel bearing lock washer as shown in Figure 1. Washer tab must be engaged in keyway and pushed deep

on spindle until it contacts and moves the outboard bearing into its hub mounted race.

The lock nut can now be threaded onto the spindle, as shown in Figure 2, and tightened by hand.

Using a six-point thin tubular socket with the appropriate calibrated torque wrench, torque nut to 200 ft-lbs. while

rotating the wheel. See Table 1 for wrench sizes. After torque is achieved, rotate wheel hub assembly an additional two

full revolutions. (Wheel should not rotate freely at a nut torque of 200 ft-lbs) See Figure 3 for socket placement.

Without disturbing the wheel/hub, back off the lock nut one full turn. Rotate the wheel.

Re-torque SKF spindle wheel nut to 50 ft-lbs while rotating the wheel.

a) Rotate two full additional revolutions

b) Back the nut off the appropriate number of washer notches according to Table 2 using the sight-gage in flange of nut.

c) Verify bearing end play of .001 to .005 of an inch using process in step #10 of this procedure.

d) If end play CANNOT be verified, repeat steps 4 through 6.

When end play is verified it is time to arm the wheel bearing lock nut system for field use. Without disturbing the

wheel/hub, locate the slot cut in the flange of the wheel nut. This slot is an alignment sight gage for the SHCS (Socket

Head Cap Screws) harmonic proof locking system. See Figure 4.

If sight gage slot aligns with washer slot, tighten and torque SHCS locking system as indicated in step #9. If sight gage

slot does not align with washer slot, rotate nut clockwise until alignment occurs, then tighten and torque SHCS locking

system as indicated in step #9.

When nut sight gage and lock washer slot alignment occurs the SHCS locking system can be torqued to a final reading

of 41 in-lbs MAXIMUM using a 9/64 hex bit socket for 1.50-12 and 1.50-16 and for all others 143 in-lb MAXIMUM

using a 3/16 hex bit socket and the appropriate calibrated torque wrench. (Make sure heads of cap screws contact

nut flange surface) Hub should rotate freely after SHCS locking system is armed. SHCS must be replaced with

each and every removal of the wheel bearing lock nut system with a replacement cap screw and using Loctite

threadlocker on the threads. See Figure 5 for SHCS location.

10)

The following procedure can be used to verify end play:

a) Make sure the brake drum to hub fasteners (wheel lug nuts) are tightened to the correct torque.

b) Clean off all surfaces of the exposed axle end and the hub face.

c) Setup gauging with similar equipment as shown in Figure 6.

d) Set the dial indicator to zero. (Gauge must be mounted to the hub and the indicator must be zeroed out on the spindle)

e) Grasp the hub/drum assembly at the 3 o'clock and the 9 o'clock positions. Push the assembly straight in, then

straight out while reading the indicator.

DO NOT rock or rotate the hub/drum assembly as an incorrect reading will result. Wheel bearing end play is the

total movement of the dial indicator.

(TMC RP618 recommends oscillation of the wheel while pushing it in and out.)

f) Bearing end play must be at least .001 of an inch and not greater than .005 of an inch.

Table/Tabla/Tableau 1

Nut thread size

tamaño de la rosca de tuerca

taille de filetage de l'écrou

3.48 - 12 Special/Especial/Spécial

Table/Tabla/Tableau 2

Axle type

Thread size

tipo de eje

tamaño de la rosca

type d'essieu

taille de filetage

Steer (front) Non-drive

diressión (delantera) no motriz

directeur (avant) non moteur

Drive

motriz

moteur

Trailer

remolque

remorque

® Loctite is a registered trademark of Henkel. All trade names referenced are the service mark, trademark, or registered

trademark of the respective manufacturer.

Wrench hex size

tamaño llave hexagonal

Clé Taille hexagonale

1.50 - 12

1.50 - 18

2.625 - 12

2.625 - 16

3.25 - 12

3 3/4"

3.48 - 12

4 1/8"

3.50 - 12

Final back off

retroceso final

recul final

1 1/2" - 12