Page No.7
NDS2 issue A
Spicer SpecialityAxle Division - Technical Publications
© Spicer Speciality Axle Division
SECTION 3 CARE OF WHEELS AND FIXING FACES (ALL AXLES WITH SPIGOT FIXING)
At approximately 100 miles after fitting wheels, wheel nut torque should be checked with wheel ends in
" cold " condition ( ie not after prolonged braking.).
If any relaxation of original torque (see specification) has occured, re-tighten.
Relaxation of initial torque may occur because of " Bedding Down" of hub and wheel surfaces.
NOTE:-
TIGHTENING SHOULD NOT BE DONE IMMEDIATELY AFTER PROLONGED
BRAKING I.E. WHEN WHEEL ENDS ARE HOT. A RELAXATION OF WHEEL NUT
TORQUE DOES OCCUR WHEN WHEEL END IS HOT BUT SHOULD REVERT BACK
TO THE ORIGINAL SETTING AS THE WHEEL END COOLS DOWN. RE- TIGHTENING
WHEN HOT WILL PRODUCE A HIGHER TORQUE READING WHEN COLD!
Although this single re-tightening after first 100 miles should be sufficient to ensure wheels stay tight,
extra checks are recommended within at least the first 1000 miles to check that wheel assembly is
stable and that no further relaxation is occuring.
see graphic on following page for correct tightening sequence of wheel nuts
3.1 Care of wheels :-
Check for CRACKS in wheels, especially around the fixing holes, and in studs, nuts and washers.
If in doubt RENEW .
DO NOT simply re-tighten very loose wheel fixings or wheels which are continualy becoming loose.
Find out why they are loose and whether any damage has been caused.
Use TRAINED personnel and keep RECORDS of all attention to wheels and fixings, including which
parts were renewed and when.
NOTE :-
FURTHER DETAILS ARE GIVEN IN BRITISH STANDARD CODE OF PRACTICE FOR THE
SELECTION AND CARE OF TYRES AND WHEELS FOR COMMERCIAL VEHICLES:-
BSAU50 : PART2 : SECTION 7A : 1995
3.2 PROTECTION OF SPIGOT WHEEL FIXING DIAMETERS AND PRESSURE SURFACES.
Although Spicer Speciality Axles Division apply an initial surface coating to wheel rim mating faces
on spigot to stop rusting and facilitate easy removal of wheels. The application of P.B.C. grease such
as 'Rocol Tufgear' or equivalent to wheel register is recommended.
The above P.B.C. grease is available from Rocol Ltd., Rocol House, Wakefield Road,
Swillington, Leeds, UK. Phone: 44 (113) 2322600. Fax: 44 (113) 2322740.
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