A. Stucki Company
2600 Neville Road, Pittsburgh, PA 15225
Phone 412.770.7300, Fax 412.771.7308
08072
www.stucki.com
Revision
001,
6/12/2007
V. REMOVAL / REPLACEMENT OF HS-7-100
If it becomes necessary to remove and replace an HS-7-100 see
Section VI: Field Inspection of the HS-7-100. The unit can be easily
removed after removing the two outboard truck springs, and the
replacement unit installed in its place. Please note that units removed
due to a low reserve oil level condition can be returned to A. Stucki
Company to be rebuilt. It is advisable to mark on the returned unit the
car number and date removed if warranty credit is applicable. It is also
important that the cardboard
sleeve taken from the piston rod of the
new unit be placed on the rod of the used unit to protect it from
damage during shipping.
If units are being removed and returned to A. Stucki Company as part
of a normal rebuild cycle, the body springs may be re-used but should
be checked for wear or damage.
*Note that the damping characteristics of the Stucki HS-7-100 are
identical to those of the HS-7 and its predecessor, the Stucki HS-6,
within a given capacity rating. Thus, on the basis of performance they
are interchangeable. However, the installer must insure that the
retention requirements specified in the installation instructions for the
particular design are fulfilled. Also, to alleviate future logistics
problems, it is advisable not to mix various models on a given car.
VI. FIELD INSPECTION OF THE HS-7-100
The HS-7-100 incorporates a low pressure seal on the piston rod
which characteristically will pass slight amounts of oil under normal
operating conditions. This oil will gradually accumulate on the body of
the unit and on the side frame spring seat, and will attract considerable
dirt. A dirty, oily appearance does not in itself constitute a defective
unit. Lost fluid is compensated for by reserve oil in the unit which
comprises about 45 percent of the total oil volume of 1350ml (46
ounces). The availability of reserve oil can be checked by visual
inspection of the oil level sight glass on the reservoir (see Figure 2).
The gage consists of a plug with a glass window, located such that the
presence of oil in the window is an indication of a functioning unit.
Figure 5 illustrates the conditions that can be encountered on visual
inspection of the sight glass. When the oil level is above the window,
the entire glass area will appear dark, as in illustration "A". Once the
oil level has dropped into the window area as in "B", the portion of two
rings on the inside of the glass above the oil level will reflect light back
to the viewer and appear shiny as shown. When the oil level recedes
below the window, these "shiny" rings will be totally visible as complete
circles as in "B".
Figure 4. Arrangement of HS-7-100
in Conventional Freight Car Truck
When inspecting the sight glass, the unit must be sitting in its normal
operating, upright position.
If the inspection of the oil level sight glass reveals condition "C" the unit
should be scheduled for replacement as soon as practical and returned
to A. Stucki Company to be rebuild. When the oil level is in the window
area, as in "B", the unit should be scheduled for replacement when the
car is next shopped. As long as the window shows full, as in "A", the
unit should be left in service, regardless of any external oil sludge
accumulation.
We strongly recommend units not be opened for refilling in the field.
This can lead to dirt contamination or overfilling with excess oil. Either
condition will result in damage to the seal and so will void the warranty.
Figure 5. Oil Level Sight Glass Conditions
