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.
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:
|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|
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
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
Standard Forge (A25, A26, 17 000 bs, 18,000 lbs trade)
Meritor (FD900, FD901, FD96l, FE900, FE903, FF900, FF901, FF921, FF93l, FF932, FF933, FF941, FF942, FF943, FF944, FF952, FF961, FG941)
Eaton (EFA12FA, EFA12FA, EFA13FS, El2001, FE931, 12K, 13.2K)
Ford Sileo 12K
|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 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.
Retainer Ring Number
|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|
View the video below to see for yourself how easy it is to set your bearings for precise preload.
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.