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5.
OPERATING THE GAUGE - COMMERCIAL VEHICLES
NOTE:
COMMERCIAL VEHICLES. The gauge is also designed to check wheel alignment on two, three or four axle vehicles. Before using
the gauge, the vehicle manufacturers recommendations in respect of loading, tyre pressures e.t.c must be complied with. In the
absence of definite instructions, it is normal practice to check commercial vehicles when fully laden and with all wheels parallel.
When setting front end alignment, never make adjustments to drop arms or interconnecting links. Doing so could result in
serious tyre, wheel and steering problems.
5.1
Single Steering Axle : Procedure is the same as for cars and vans.
5.2
Twin Steering Axles : When checking wheel alignment on twin steering vehicles you will also need to use the GA50/PPL42 optional
equipment package comprising larger mirror and frame.
5.2.1 Check alignment of the two pairs of front axle wheels ( A & B in fig.5 ) in the same way as you would for cars including the calibration
procedure. Adjust if required to the manufacturers recommendations or set to parallel.
5.2.2 Replace normal mirror unit with the larger GA50/PPL42 mirror unit (see Section 5.2). Place this unit against the last axle ( Y in fig.5 )
with the mirror orientated towards the front of the vehicle.
5.2.3 Stand the laser unit on a level floor approximately 1metre ahead of the front bumper with the target plate facing the mirror. This is the
set up shown in fig.5. With the pointer at zero, move the laser unit until the beam is visible on the vertical centre line of the target plate.
5.2.4 Without moving the laser unit, transfer the mirror unit to the next axle ( X in fig.5 ) and check the reading. This should be identical to
axle ‘Y’. If not then the rear axles are not parallel and will require adjustment.
5.2.5 Position mirror unit at axle ‘A’ and check reading. If the original setting was parallel the laser beam should be central on the target plate.
For a toe in setting, move the pointer until it shows half the amount of the recommended toe-in ( e.g. a 20’ movement for a 40’ toe-in ).
The laser beam should now be central on the target plate. If not, gently turn the steering wheel, keeping the contact bars positioned on
the rim or the tyre sidewall until the laser beam is central. Axle ‘A’ is now correctly aligned with the rear axles.
5.2.6 Move the mirror unit to axle ‘B’ and note the reading in comparison to axle ‘A’.
5.2.8 If the reading is different the inter-axle adjuster will need adjustment, recheck from step 5.2.2 onwards.
5.2.7 To compensate for run-out in tyres and/or wheels roll the vehicle forward until the wheels have rotated half a revolution (180
steps 5.2.2 to 5.2.6. Should the results vary, average the figures obtained. Adjust the connecting rods as necessary until the laser beam
appears central.
6.
MAINTENANCE
6.1
If laser beam becomes difficult to see on target remove circular hatch at rear of laser unit and replace batteries.
7.
ACCESSORIES
7.1
The laser can be powered from a cigarette lighter socket using optional cable accessory GA50/PPLBL which plugs into the back of
the laser unit.
LASER WHEEL ALIGNMENT GAUGE
GA50
Model:
EN 60825-1 Laser safety
93/68/EEC CE Marking Directive
NOTE:
It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice.
IMPORTANT: No liability is accepted for incorrect use of this product.
WARRANTY: Guarantee is 12 months from purchase date, proof of which will be required for any claim.
INFORMATION: Call us for a copy of our latest catalogue on 01284 757525 and leave your full name and address including your postcode.
01284 757500
Declaration of Conformity
is in conformity with the following standards and directives.
The construction file for this product is held by the Manufacturer and may be inspected, by a national
authority, upon request to Jack Sealey Ltd.
Sole UK Distributor, Sealey Group,
Bury St. Edmunds, Suffolk.
01284 703534
We, the sole importer into the UK, declare that the product listed here
Signed by Mark Sweetman
For Jack Sealey Ltd. Sole importer into the UK of Sealey Professional Tools.
sales@sealey.co.uk
e-mail
). Repeat
0
10th March 2004
www.sealey.co.uk
9A>
GA50 - 3 - 090304
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