Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 44)

40 Precision Loads On-Board Weighing Installation & Service Manual
4.8 Trunnion Load Pin Installation
Trunnion load pins are available in 48 inch and 54 inch lengths, to replace the 4" diameter trunnion tube of single
point trailer suspensions.
Figure 4-41. 48” Trunnion Load Pin
Trunnion
Stand
Load Pin with Bushing
Figure 4-42. Exploded View of a Trunnion Installation
When installing a trunnion load pin in a single point trailer suspension,
1. Ensure the trailer is on a level surface.
2. Clean all exposed bolt threads on the trailer stands.
3. If retro-fitting a new trunnion to an older suspension, sand the center of the dead axle tube in the area
between the stands to ease removal of the old tube.
4. Loosen the spring u-bolts. It may be necessary to cut off the existing u-bolts and replace with new.
5. Remove the existing dead axle tube.
6. Sand and clean the inside of each stand clamp. Eliminate all rust if present.
7. Position the trunnion load pin so the machined flats (anti-rotation flats) are facing up. When installing a
trunnion load pin, ensure the trailer is on a level surface. Do not put any grease, oil or other lubricant on the
trunnion load pin.
8. When passing the trunnion through the stand clamps, some tightness is typical. Do not pound on the end of
the load pin with a sledge hammer directly. Instead, use a block of wood with the sledge hammer, or some
other means to uniformly drive the load pin, which does not deform the end of the load pin itself. Note the
UP ARROW ^ on one end of the trunnion load pin. Before tightening the stand clamps after centering the
load pin, make sure the UP ARROW is perfectly vertical to within 3 degrees.
9. Ensure the bolts and nuts of the stands are tightened and torqued to the specifications of the manufacturer.
Torque measurements must be taken from the nut only.