Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 16)

12 Precision Loads On-Board Weighing Installation & Service Manual
Figure 4-3. 5th Wheel Load Cell Kit
Note
Rice Lake Weighing Systems recommends the installer use 5th wheel or kingpin plate load cell mounts for
weighing over the tractor drive axles, and underbody load cells in subframe mounts for rear trailer suspension
weighing.
4.1.1 Installation Procedure
1. Exhaust all air from the air suspension system. The truck brakes should be on and the tires should be
blocked. For trailer installations, trailer kingpin should be supported on a 5th wheel or landing gear and the
trailer brakes should be on or tires should be blocked.
Note
Note
Different height control valves have varying air flow rates. The rate of air refill flow can affect the weight values
displayed on the scale system if the height control valve has a slow rate of air flow to reach full ride height. To
provide a fast response to weight changes while loading, the Haldex model #905-54-241 height control valve is
a recommended air flow valve.
Optional: Remove the existing leveling valve and replace with the Haldex unit. Follow Haldex instructions
on mounting the new height control valve. Fitting size of the Haldex unit is 1/4" N.P.T. (12mm x 1.5 metric
version). Haldex valves may be purchased from Rice Lake Weighing Systems
2. The air pressure transducer must be installed to the air lines between the left and right side air bags, for
both single and dual-ported leveling valves. See figures 4-4 and 4-5
Clean and remove any paint from the air line before inserting air line into the tees and fittings. Chipped paint on
the air line can result in air leaks at the fitting ends. Use pipe thread seal tape on all fitting ends. Rice Lake
Weighing Systems recommends the use of push-on type air fittings and tees. All tees and fittings used must be
DOT approved. For dual sensor transducer installations, keep the lengths of the air line used from the sensor
to the tee fittings as equal as possible on both sides. See Figure 4-4.