Technical Notes
ALIGNMENT LIFT - Scissor-typeNOTES, REQUIREMENTS, INFORMATION, ETC.
Access from the side is restricted by the arms of the scissors mechanism. Power jacks are more difficult to integrate into the runways. The width of the lift is less than that of four-column lifts. The power supply and control lines must be routed through a conduit in the floor (approx. 100mm dia), or covered on the floor. The controls are housed in a separate control stand. When selecting this type of lift, wheelbase accommodation is important and limitations must be observed. The wheel contact patches must be horizontally and vertically level. The permissible deviation from left to right, from front to back and diagonally when loaded with one vehicle is max. 1 mm. This figure applies to lifts in both lowered and raised positions. The manufacturer or supplier must use a transit for adjustment. Variations in camber between "lowered" and "raised" must be < 2 minutes + 1 digit. QUALITY ASSURANCE AND UTILITY VALUE RETENTION: See Quality Assurance documents pertaining to this lift type. Scissors lifts require sophisticated design and manufacture in order to meet the stringent requirements for wheel alignment. The following prerequisites must be satisfied if full advantage is to be taken of this sophistication:
MKS (Measurement Control/Monitoring System) The MKS (Measurement Control/Monitoring System) requires precision sensor mounting bores (fit dia. F6) in the sides of the ramps for the attachment of the attachment of the alignment sensors/heads. The heads are inserted into the mounts as the sides of the ramps, aligned horizontally and fixed with clamping bolts. The runways should be loaded with a vehicle. Only then should the electronic turntables and the rear slip plates be released. If reference value variation > 5' are found when the lifting platform is lowered, there may be level changes at runways or calibration drift at the alignment sensors/heads. The newer aligners have a special program or display for determination the reference value variation (e.g. ML4601). With these types, the "runway" camber and toe values as determined after leveling of the lifting platform are stored as reference values ("zero values"). Variations in camber between "lowered" and "raised" must be _ 2 minutes + 1 digit. For this measurement, the alignment sensors/heads must be installed on the vehicle. The runways must be adjusted if the measured values fall outside the tolerance range (see MKS Measurement Control/Monitoring System).
Scissors lifts have separate, upright control consoles which usually incorporate the hydraulic unit. It is therefore necessary to install a duct (approx. 100 mm dia. no 90 bends) in the floor between the control console and the lift itself. Subsequent installation of the lines on the floor is possible, although not recommended (interferes with floor cleaning and transport of heavy loads). Hydraulic and compressed-air lines and the power cables are routed through the duct. DISTANCE to SHOP WALL (in vehicle direction):
Scissors-type lift: above ground installation 1 = Alignment (Display) Console |
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| (H0010323) Scissors-type lift, in-ground (floor-level) installation |
Scissors-type lift: in-ground (floor level) installation
1 = Alignment (Display) Console
X = 1700-2000mm (recommended)
Z = approx.4300 mm
NOTE:
1.0 Depending on the electronic turnplate locations, the vehicle may overhang the front edge of the lift ramps (most pronounced with the R129).
This should be taken into account when measuring distance X.
DISTANCE to SHOP WALL (in vehicle direction):
2.0 The depth of the equipment cabinets and alignment consoles vary according to model and manufacturer. In some cases, the depth is increased by a drawer-type control panel. This must be taken into account when measuring the lift/wall distance (X); see samples below:
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| (F4025195) Beissbarth ML 4001 with drawer-type control panel at the front |
(F4020221) Beissbarth ML 4601 with PC keyboard at the side (no control panel) |
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