Assembling the Step Over
12
STEP 8 - Levelling and finalising of treads
With the platform now fully assembled, check the tread rise (distance in height between treads),
going (where the tread sits in plan), and angle.
Starting at the bottom tread, measure the rise between the treads ensuring that there is no more
than 5% difference between any two tread heights*.
Looking from above, there should be a minimum of 10mm overlap on the treads*.
Starting at the top tread, and using a spirit level, ensure that all treads are level left/right and
forwards/backwards. If an adjustment needs To be made in the fore/aft level simply slacken the
grub screws on the 45-76 and 10-76 on both sides, adjust tread to correct, level angle and re-
tighten.
If adjustment needs to be made to accommodate the 10mm overlap between treads, simply undo
the 13mm nuts holding the tread extrusion to the 199-6 fitting and adjust, ensuring that they
are re-tightened on completion.
(* = The Stair rail and tread assemblies are pre-assembled at Kee Safety so no major adjustments
should be required)
STEP 9 - Check and recheck all grub screws and finalise assembly
Once all treads are level, the platform is fully assembled, and the toe board is present
ALL
grub
screws are to be torqued to 39Nm
Starting at the lower left staircase, working from the lowest point, systematically tighten all grub
screws with a calibrated torque wrench and indelibly mark the grub screws with a paint marker
once at torque.
This performs two functions, it lets the installer know once a grub screws has been tightened, but
also on annual inspection allows the inspector to see if a grub screw has come lose and needs
attention.
The same principle is applied to all other fixings, using 18Nm for all 13mm headed fixings, 25Nm
on toe board M12 fixings and Tek Screws to be tightened until a compressing of the foam backed
washer is observed.
It is IMPERATIVE that ALL grub screws and fixings are checked on the ENTIRE assembly and
torqued up to the correct torque value and marked!!
STEP 8
STEP 9
