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Mk 5 Pan & Tilt Head Maintenance Manual
The upper end of the bolt is centralised by a ballrace, and this is secured in place by a special nut. Both nut
and bolt are positively locked by countersunk screws.
Pan lock
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This consists of a pair of brake shoes complete with linings, pivoted on the pan lock adjuster assembly,
and expanded by the brake cam.
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The shoes are tensioned away from the raised section of the flange of the base plate by two springs.
The assembly is fitted to the underside of the body and retained in place by a thin plate. The brake shoes
operate against the inside face of the flange. The adjuster protrudes through the top face of the body and
terminates as an adjuster screw with a 2BA locknut. The brake cam is located within a bush and is retained by
an external circlip. The pan lock lever assembly is attached to the head of the brake cam spindle, and travel is
limited by raised portions of the body.
Friction
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This consists of two brake segments, pivoted at one end on pins that are fixed to the body. The
segments bear against the outer periphery of the flange of the base under the influence of a pair of springs
that are tensioned by the action of the friction screw thumb nut screws on the body assembly e flange of the
base under the influence of a pair of springs that are tensioned by the action of the friction screw thumb nut