Operating instructions

(1) Select a suitable horizontal location for the roof bearing. Maximum and minimum

installation dimensions are shown on pages 16 and 17. Ensure that there are no

obstructions for the base plate on the floor.

(2) Cut a hole in the outer skin equal to the internal diameter of the tapping plate.

(3) Clamp the bearing centrally over the hole and using it as a template, drill eight

holes 6.5mm diameter.

(4) Assemble the bearing and tapping plate as shown with the neoprene gasket

sandwiched between the bearing and vehicle skin. The screw heads should be

sealed with suitable compound to prevent water ingress. If the surface of the roof

is fluted patterned or in some way not perfectly flat, it will be necessary to use

filler and sealer to ensure it is horizontal and that there is a perfect seal.

(5) Ensure that the base plate is in exactly the right position below the bearing by

using a plumb line or similar device. Remember that the weight of the mast may

be as much as 130kgs, which would affect the horizontal plane of the vehicle.

(6) Remove all valves from the mast and fit the neoprene O-ring over the base tube,

position it at the approximate height of the clamping shroud. The mast may now

be lowered through the bearing onto its base plate. The fixed base plate will be

screwed to the underside of the mast and then bolted to the floor. The rotating

base plate accepts the special base spigot screwed to the mast base.

(7) The two halves of the clamping shroud may be clamped into position. Lightly

grease the O-ring and make sure it lines up with the groove in the shroud. The

mating faces of the two halves of the shroud should be covered with silicone

sealer compound to make them waterproof. Clearance between the bearing outer

diameter and the clamping shroud is already machined to the correct dimension,

therefore, only the piston of the clamping shroud above the bearing needs to be

set, it should be as close as possible without touching. If mast rotation is not

required then the two parts can be coated with sealer where they touch before

bolting up.