MLS MMLS3, Operator'S Manual

Page: 14 / 48

MLS Test Systems Pty Ltd
Revised: April 2013
12
removing its hinge pins.) Mount and hand tighten the flange.
Plug the unit into a 220 Volt AC supply.
3.1.1.2 Handling the chain of bogies by the round wheel shafts on the
link sections only, move one of the 300mm wheels to be exactly
underneath the flange of the calibration unit. Hold the bogie
firmly in place and turn the crank to push down onto the wheel.
3.1.1.3 Observe one of the two 25mm diameter rubber stoppers on the
wheel trailing arms (fig.3). As the wheel is pushed down, the
stopper will move away from the frame of the bogie. Turn the
crank until the gap is about 10mm and read the force from the
display. NEVER INCREASE THE GAP TO MORE THAN 20
mm, BECAUSE THE SPRINGS WILL BE OVER STRESSED.
Because of friction in the system a higher reading may be
observed while the wheel is pushed down than while letting it
move back. Turn the crank forwards and backwards about one
revolution at a time and note the average reading.
3.1.1.4 From time to time apply some MS grease to the threaded rod of
the calibration unit.
3.1.2 Adjusting the wheel load
3.1.2.1 Measure the wheel load as described in 3.1.1 above.
3.1.2.2 Refer to fig. 3 and apply a small amount of MS grease to the
thread on the spring shaft as well as one of the faces of a round
spacer (supplied) and insert it, small end first, over the open end
of the spring shaft, followed by a M16 nut (nut A). NEVER
USE A STAINLESS STEEL NUT, as it will seize onto the
shaft. If the wheel load is to be increased, tighten the nut to
compress the spring by about 5 mm, otherwise compress it by
about 2 mm. Release the locknut (nut B) on the flange at the
opposite side of the spring and move it away from the flange.
3.1.2.3 Adjust the position of flange B on the spring shaft by rotating
the spring and both flanges simultaneously. Make a mark on