Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 45)

Note
Note
Applications 41
After the first two weeks of use of the trunnion load pin, re-check all stand bolts and nuts and u-bolts and nuts
to verify correct torque values. These bolts and nuts should be checked at 4 month intervals thereafter.
10.When reassembling the suspension, use two new neoprene (poly) bushings on the trunnion instead of
rubber bushings. Rice Lake Weighing Systems can furnish poly bushings for all trunnion load pin
installations
11. As a general rule, mount a protective shroud or plate to cover the connector area of the load pin and mating
cable connector if they are exposed in any way. Split loom or cable wrap on any exposed areas of cable is
advised for protection of the cable from damage. Tie down the cable at least every 18 inches.
12. After the trunnion load pin installation is complete including coupling of both connectors, the load pin and
stands should be painted with a high quality enamel paint, or covered with an underbody coating such as
3M™ Universal Rubberized Undercoating (3M part number 8883).
Machined notches are provided at the top surface of the load pin to enable the installer to mount flat bar
retainers to prevent trunnion rotation. Weld the flat bar retainers to the trailer stands for preventing trunnion
rotation, but never weld directly to the trunnion or allow the trunnion groove areas to become overheated
(greater than 140 degrees F. 60 degrees C).
Never weld to the trunnion load pin under any condition as this voids load pin warranty and may damage the load pin.
4.9 Sandshoe Load Pin for Landing Gear
On-board scale applications in which a trailer is loaded without the presence of a tractor utilize weighing
equipment, which is installed to the trailer rear suspension, such as spring suspension hanger load cells, single
point trunnion load cells or air ride suspension transducers, and load pins installed in certain types of pivoting
sandshoes on trailer landing legs. If your landing legs use removable pivoting sandshoes, such as those built by
Holland, Jost or Binkley with 2" diameter pivots, our standard load pin sandshoe assembly can be installed as a
direct replacement. For landing legs with welded or fabricated, non-pivoting feet, contact Rice Lake Weighing
Systems.
Sandshoe assemblies are provided with retractable coil cables between the load pin output cable and the
transmitter. This cable facilitates lowering and raising of the sandshoes for weighing and driving positions.
Note
Rice Lake Weighing Systems furnishes kits that include one load pin per landing leg and a modified, reinforced
sandshoe assembly with integral load pin collars welded in place. Do not attempt to use replacement part
sandshoes from parts suppliers as these do not contain integral collars nor have they been reinforced for
adequate support strength, as have the RLWS sandshoes.
The installer must be aware of the terrain on which the sandshoes will be placed for weighing. These surfaces must be flat
and rigid, preferably leveled pavement. Sandshoes, which are placed on surfaces that are out-of-level, or provide poor
sandshoe support, will not yield accurate weighing results and could result in damage to the sandshoe structure over time.
The installer must also be aware of terrain over which the trailer is transported, so that high road surface areas such as
railroad track crossings, which could contact the sandshoes, can be avoided.
Stand-alone trailer applications that typically utilize sandshoe load pins, by definition, are not coupled to tractors and
therefore do not have a 12 or 24 Vdc power source available to supply the scale. These applications generally require an
external source of 12 or 24 Vdc power for scale operation.
Stand-alone trailer applications which typically utilize sandshoe load pins and also involve trailer air-ride suspensions, by
definition, are not coupled to tractors and therefore do not have air re-supply capability for the air system reservoir, which
is depleted during use. These applications require an external air supply source to maintain air to the suspension. A
Timbren GA120 air supply valve kit is recommended for use when supplying air to the rear trailer air suspension that
bypasses the braking system. Loss of air pressure to brakes can result in movement of the trailer during loading which can
be detrimental to the landing gear. Do not supply air to the trailer suspension in these applications through the existing
glandhand air connections.
4.9.1 Installation Procedure
1. With front of the trailer fully supported, elevate the landing legs, and remove the existing sandshoes.
2. Install the new sandshoes and load pins. Ensure that the load pin has the arrow sign or UP sign in the
correct direction, so the load pin operates with the correct polarity.
3. Lock pins in place using the ½-20UNF x 3.50"L Grade 8 bolt, with bolt head facing UP, through the collar
and load pin holes. Install with washer and nylock nut. The installer should determine if the output cable of
the load pin should face inwards or outwards.
4. The installer is responsible for mounting a protective tube on the upper body of the landing leg assembly to
pass the load pin output cable and mating coil cable through. See Figures 4-43 and 4-44. The outside
diameter of the mating connector to the load pin cable is 1.25" (32 mm)
5. Adding a protective angle, as shown in Figures 4-43 and 4-44, is recommended to provide protection to the