Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 63)

Table 6-2. Spring Bolt Mounting Specifications
Load Cell Model Body Spring Part No. Bolt Part No. Size
PL9000-13 PL9000-02S 1" Coil PL9000-22D 1"-14UNF x 4.50" L
PL9000-14 PL9000-01S 3/4" Coil PL9000-17F 3/4"-16UNF x 4.00"L
PL9000-14.4 PL9000-02S 1" Coil PL9000-22D 1"-14UNF x 4.50" L
PL9000-16 PL9000-01S 3/4" Coil PL9000-17F 3/4"-16UNF x 4.00"L
PL9000-17 PL9000-01S 3/4" Coil PL9000-17F 3/4"-16UNF x 4.00"L
PL9000-22 PL9000-02S 1" Coil PL9000-22D 1"-14UNF x 4.50"L
PL9000-26 PL9000-02S 1" Coil PL9000-22D 1"-14UNF x 4.50"L
Appendix 59
The above bolt lengths are supplied on the basis that the following installation requirements are met by the
installer:
• The bolt lengths supplied require the use of 1/2" or 5/8" thick mounting brackets. Any bracket thickness
greater than 5/8" may require longer bolts. Rice Lake Weighing Systems does not ever recommend the use of
bracket material which is less than 1/2" thick.
• The stainless steel tabbed anti-rotation plates supplied must be used when mounting coil springs and bolts.
• The body springs supplied should be compressed by the mounting bolts on final installation by
approximately 1/4" to 3/8" (9.5 mm). A serviceable thread locker should be applied to the bolt threads during
final installation.
• If any of the bolts are found to bottom-out in the load cell, they must be removed and replaced with a shorter
length bolt. Bottoming out of the bolts cannot be tolerated as it creates and unsafe operating condition and
possible damage to the load cells or other components. It is the installer's responsibility to ensure that all
bolts used in the installation are of the correct length.
If replacing supplied bolts, the installer must use SAE Grade 8 bolts only, and all recommended bolt torque
specifications must be observed.
6.3 Welding Specifications
Preliminary Information
Welding, metalworking and assembly should only be performed by qualified personnel experienced in welding on
vehicle body structures and subframes. Only welding equipment of the highest quality should be used in the
welding of load cell bearing plates. When welding use procedures that ensure high quality welds. Over welding
may result in distortion and damage, while under welding may not develop adequate strength.
Rice Lake Weighing Systems recommends removal of load cell after tacking bearing plates in position so that final
welding is performed without load cell being subjected to excessive heat, weld current, or cable damage.
If welding with load cells in position, the installer must ensure that electrical current cannot flow through the load
cell. All load cell terminals must be shorted together. Attach the ground strap directly to the vehicle frame member
to which the bearing plates will be welded. Never weld directly to a load cell.
Always disconnect battery terminals before performing any welding.
Welding Process
For welding the bearing plates, use a low hydrogen process and AWS E7018 rod or equivalent. Welding may be by
Shielded Metal Arc Weld (SMAW) stick, Flux Core Arc Weld (FCAW), or Gas Metal Arc Weld (GMAW) spray
transfer. Do not use GMAW short circuit transfer.
Weld Configuration
Welding of the bearing plates may only be done by triple-pass fillet weld sequence. For load cells with single-piece
bearing plates, weld all three sides on each end with 2.50" or 3" solid weld runs (see drawing and instructions
below). For load cells with dual bearing plates, weld each bearing plate on the two outer sides and end only.
Welding the inside surface of the bearing plate is not necessary, but not harmful either as long as the bearing plate
maintains its correct position. See Figure 6-1, “Weld Sequence,” on page 60.