FOG QUADRA 493 9021 - COMPONENT CHECKS; Column Adjustment Verification

E 167 - GB - 6
18
Rue du Pré Neuf - 58440 MYENNES FRANCE
QUADRA
493 9021
493 9031
Checking the column adjustment
Raise the unloaded platform to 300mm from the ground, suspended by the wire ropes.
Check the following:
• That each column is square, using a rule placed firmly on the outer surface, and which is then
used to sight the opposite column.
• That each column is centred on its cross-member cheek plate to prevent excessive friction on the
plastic studs on the column aperture.
• That the clearance between each cross-member and column is between 1 to 3 mm.
• That each column is vertical, by means of a plumb line. In order to eliminate any clearance
between cross-members when the platform is in its operating position, the distance between the
tops of the columns of one particular cross-member must be slightly less (5 to 15 mm).
NOTE: If a cross-member is too tight between columns, an unladen platform could jam when
being lowered, causing the wire rope to slacken and the latches to engage in the ladders.
If necessary, adjust the position or the vertical plane of one or more columns, by placing shims under the
base plate and adjusting one or more of the tie-rods under the ends of the fixed track.
Check inside the columns with the platform at three different heights e.g. low, medium, high, that the ladder
edges do not rub on the inner surfaces of the cheek plate flanges.
Checking the latches
With the platform raised and suspended on the wire ropes, check at each end of the cross-members that the
latch operates freely without sticking. If necessary, identify the cause of the problem and rectify (e.g. rust,
using too thick an oil to lubricate it, latching solenoid sticking due to ingress of dirt etc.)
Checking the rocker arm retaining system
With the unloaded platform raised and suspended on the wire ropes, proceed as follows at each cross-
member end:
• Pull on the retaining rod to check that the bush turns freely.
• Check the rod clearance (Fig. 17). This clearance must be 6 mm. Correct if necessary by
adjusting the stop nut on the end of the rod.
Checking the safety brake cam
With the unloaded platform raised and suspended on the wire ropes, proceed as follows at each cross-member
end:
• Measure the clearance between the cam and the ladder rack. This should be between 1.2
and 1.5 mm. If necessary, release the locknut and adjust the cam retaining rod (See Fig. 12)
and check that the cam turns freely.
Checking the wire rope safety switches
The tension of each platform suspension wire rope is monitored at each end of the cross-member by a
sensing roller mounted on a rocker arm.
If one of the wire ropes becomes slack because of an obstacle under the platform or a broken wire rope, the
corresponding rocker arm pivots and activates the first contact on the switch which in turn causes the latches
to become engaged, thereby stopping the platform. The second contact is also activated and this prevents
the platform from being raised again.
If, when the platform is being lowered onto the latches, these do not engage in the same ladder slots on the
same horizontal plane, or if one of the latches engages unintentionally when the lift is being lowered, the
supporting latch retaining system restricts the rotation of the rocker arm in such a way, that only the first
electrical contact on the switch is actuated. This causes the other latches to engage.
NOTE: It is still possible to raise the platform again in order to re-adjust the platform so that it is level.