For best results the use of axle extensions and a "bazooka" type
king pin post, or a suitable optical alignment device, are
Level the empty trailer and release the parking brake
Ascertain that all springs are bearing on the wear pads
and the equalizer is leveled. This can be helped by
shaking the trailer down prior to alignment.
NOTE: Prior to alignment, use of a high lift 5th wheel, shop
movement over irregular terrain may displace the
Align the front axle with the king pin as shown in the
sketch. Align the rear axle with the front axle.
Install and tighten the 3/4" adjustable torque arm clamp
nuts to 175-200 lb. ft. Tighten 1/2" torque arm nuts to
75-80 lb. ft. torque.
After an initial loaded run-in period of at least 1,000
miles, the trailer alignment should be rechecked and
corrected. Furthermore, all fasteners, especially U-bolts,
should be retorqued.
21-B Trailer Suspension Maintenance Recommendations
The 21-B heavy duty trailer suspension, by design, requires a minimal amount of maintenance. However, suspensions in
"over the road operations", require periodic checks to assure continued trouble free performance.
Our recommended 180 day inspection procedure is to:
Check U-bolt nuts to assure maintenance of 300-325 lb. ft. torque.
Check all hanger mounting bolts to assure tight fit of hanger to frame. For specific torque recommendations,
consult the vehicle service manual or manufacturer.
Check equalizer nuts (or equalizer bolts) to assure that 200-225 lb. ft. torque is maintained.
Check torque arm bolts to assure that 160-200 lb. ft. torque is maintained.
Check torque arm 3/4" clamp nuts to assure that 175-200 lb. ft. torque is maintained. Check 1/2" clamp nuts to
assure that 75-80 lb. ft. torque is maintained. Insure the clamp is directed away from the spring to prevent
possible interference during operation.
Check fit of springs to hangers and equalizer to assure continued good "ride" characteristics of REYCO
We recommend, during pre-delivery and after the first 1,000 miles of operation, that all of the above items be checked
when any one of the following conditions prevail:
In addition to checking alignment during pre-delivery and at the first 1,000 miles of operation, suspension alignment should
be checked when any one of the following conditions prevail:
Discovery of a loose suspension fastener. (Loose is defined as any torque below the recommended torque.)
Discovery of elongated holes in a suspension component.
When bushings are being replaced.
Excessive or abnormal tire wear.
To insure an accurate torque reading, the torque tool used for checking torque must provide a correct measurement.
Also, the nut and bolt should be dry (free of any lubrication) and clean (free of any dirt, grit, rust, etc.).
Failure to maintain the specified torque values and/or to replace worn parts can cause component and/or system failure
resulting in an accident with consequent injury or death.