C.Y.A. WITH THE MERITOR® WHEEL BEARING ADJUSTMENT SYSTEM

Superior Bearing Adjustment For Better Wheel-End Management, Longer Tire Life And Less Downtime.

Our goal is to provide fleets and end users with products that Cover Your Assets. That’s why we’re offering you the new Meritor Wheel Bearing Adjustment System – which includes Doctor Preload® and Temper-Loc® spindle nuts from Temper®.

Founded in 1969, Temper is a leading engineering and manufacturing company in precision assemblies and equipment – including solutions for heavy vehicle applications – such as the Doctor Preload and Temper-Loc bearing adjustment systems.

HEAVY-DUTY WHEEL BEARING MANAGEMENT BEGINS WITH A LIGHT PRELOAD.

The Society of Automotive Engineers (SAE International) maintains that the optimal setting for wheel bearings is a light preload − defined as a measured "tight" bearing setting in which all of the rollers in the tapered roller bearings are kept under a slight force, or load. Preload keeps vibration and angular movement in the wheel end to a minimum during operation, reducing potential bearing wear.

Load on bearings, including preload, is measured in pounds-force (lbf). SAE Recommended Practice J2535 stipulates that the optimal settings for drive- and trailer-axle wheel bearings is between 500 and 1,000 lbf and between 250 and 500 lbf for steer-axle wheel bearings. At the recommended settings, bearings, seals and other wheel-end components experience less vibration, so they can deliver maximum performance.

Without preload, there is space, or clearance, between the bearing components, and the bearings are said to have end play (also referred to as a loose bearing setting). Excessive end play can result in extreme wear on bearings, spindles, tires and wheel seals. It can also cause anti-lock braking system (ABS) faults.

Doctor Preload, when used in conjunction with Temper-Loc nuts, is the ideal wheel-end bearing adjustment tool. The system sets the bearings to precise preload settings with a quick, simple, reliable and repeatable process. It easily adjusts wheel-end bearings to meet SAE J2535 recommended preload settings to achieve the following:

Specifications
Doctor Preload Tool Part Number Use with Temper-Loc Nut Axle Spindle Application Axle Applications
MER415005 MER614723 TP Trailer Meritor (TP}, Dana, Eaton (P22), Fruehauf, Propar
MER415003* MER614743 TN Trailer

Meritor (F H, RL, RQ TK, TKL TKLD TL, TLD, TN, TND, TO, TQC, TQD) Dana Spicer (020, D2l, D22, DD22, K2l, K25,K30)

Eaton (C, C2, CD, CD2, CE ESA225J, EST EST225J, EST230J, ETA230C, ETA225D, ETA225J, H23L, H25R, HCE, HJ, HJE, LA15, Tl8C, 20L 77, 22L, 22R, J, JE, JH, 23L, 23R, 25Rl

Hendrickson (HN)

Ingersoll (A22T)

Standard Forge (A25, A26, 17 000 lbs, 18,000 lbs trade)

MER415084 MER614743 TN Trailer with Aluminum Hubs

Meritor (F, H, RL, RQ, TK, TKL, TKLD, TL, TLD, TN, TND, TO, TQC, TQD) Dana Spicer (020, D21, D22, DD22, K21, K25, K30)

Eaton (C, C2, CD, CD2, CE, ESA225J, EST, EST225J, EST230J, ETA230C, ETA225D, ETA225J, H23L, H25R, HCE, HJ, HJE, LA15, Tl8C, 20L 77,22L, 22R, J, JE, JH, 23L, 23R, 25Rl

Hendrickson (HN)

Ingersoll (A22T)

Standard Forge (A25, A26, 17 000 bs, 18,000 lbs trade)

MER415002 MER614836 FF Steer

Meritor (FD900, FD901, FD96l, FE900, FE903, FF900, FF901, FF921, FF93l, FF932, FF933, FF941, FF942, FF943, FF944, FF952, FF961, FG941)

Spicer (ll00S)

MER415347 MER614837 FE Steer

Meritor (FE931)

Eaton (EFA12FA, EFA12FA, EFA13FS, El2001, FE931, 12K, 13.2K)

Ford Sileo 12K

Ford 6K

MER415004 MER614973 R Drive Meritor (TR), Eaton (P22), Ford, Rainstar

Note: Not compatible with Conmet aluminum hubs for TN trailer axles. Contact our Customer Care team for more information.

TEMPER-LOC SPINDLE NUTS. FOR PRECISE POSITIONING.

Temper-Loc is the spindle nut exclusively matched with the Doctor Preload bearing adjustment tool as part of the Meritor Wheel Bearing Adjustment System.

With its unique chambered mounting face, the Temper-Loc precision single-locking nut system provides extremely accurate bearing adjustment. Each Temper-Loc nut is manufactured to ultra-tight machining tolerances. The nut system sets optimal wheel-end preload that maximizes tire life and vehicle uptime.

  • Heat-treated nut face for superior strength
  • Fingertip control retainer ring for ease of placement and positioning
  • EasyView® verification of locking
Specifications
Temper-Loc
Nut Assembly
Number
Replaces
Stemco
Number
Replacement
Retainer Ring Number
Axle Spindle
Application
Thread
Diameter
Threads
Per Inch
Tool Socket Size Outer Bearing
MER614723 447-4723 MER644723 TP Trailer 3.480" 12 4-13/16" - 8 point HM518445 / HM518410
MER614743 447-4743 MER644743 TN Trailer 2.625" 16 3-3/4" - 8 point HM212049 / HM212011
MER614836 448-4836 MER644836 FF Steer 1.500" 12 2-1/2" - 6 point 3782 / 3720
MER614837 448-4837 MER644837 FE Steer 1.500" 18 2-1/2" - 6 point 3782 / 3720
MER614973 449-4973 MER644973 R Drive 3.250" 12 4-3/8" - 8 point 580 / 572

Just Six Simple Steps. For Miles of Added Performance.

View the video below to see for yourself how easy it is to set your bearings for precise preload.

WE ALSO COVER YOUR ASSETS WITH MERITOR SUPPORT.

Doctor Preload tools are covered by a 1-year warranty, valid from the sale date. Temper-Loc nuts are covered by a 3-year warranty, valid from the installation date. Documentation of tool sale date and nut installation details (including installation date) must accompany a warranty claim submission. The Doctor Preload tool and Temper-Loc nut system must be registered for warranty eligibility. Meritor’s expert Customer Care team is your source of complete support for the Meritor Wheel Bearing Adjustment System.

Download the Meritor® Wheel Bearing Adjustment System brochure for complete information. And make sure your assets are covered.