Rebound Strap; Longitudinal And Transverse Torque Rods - ProGear Hendrickson HN FR Series Service Manual

NOTE
17730-285
Pro Gear and Transmission • 906 W. Gore St. Orlando, FL 32805 • 1 (877) 776-4600 / (407) 872-1901 • parts@eprogear.com

REBOUND STRAP

Periodic inspection of the rebound strap, see Figure 6-8, is required every six (6) months. If the
rebound strap is torn, frayed, or not intact replace as outlined in the Components Replacement
Section of this publication.

LONGITUDINAL AND TRANSVERSE TORQUE RODS

HN FR SUSPENSIONS INCORPORATE TRANSVERSE RODS FOR VEHICLE STABILITY. IF THESE
COMPONENTS ARE DISCONNECTED OR ARE NON-FUNCTIONAL, THE VEHICLE SHOULD NOT BE
OPERATED. FAILURE TO DO SO CAN RESULT IN ADVERSE VEHICLE HANDLING, LOSS OF VEHICLE
CONTROL, POSSIBLE TIRE CONTACT WITH THE FRAME, PREMATURE COMPONENT DAMAGE, OR
SEVERE PERSONAL INJURY.
All torque rods need to be inspected for looseness by one of the following methods.
■ Method 1 — For Tractor applications only with brakes applied, slowly rock the empty
vehicle with power while a mechanic visually checks the action at both ends.
■ Method 2 — with the vehicle shut down, a lever check can be made with a long pry bar
placed under each rod end and pressure applied.
Visually inspect torque rod bushings for torn or shredded rubber, inspect for bent, cracked, or
broken torque rods and also for end hubs that have an elongated "oval" shape. Any of these
conditions require component replacement.
The length of the torque rods is determined by the truck manufacturer for optimum drive line
angle and alignment. The longitudinal torque rods control pinon angles and also absorb accel-
eration and braking forces. The transverse torque rods control the side to side inputs such
as cornering. The mounting brackets at the axle ends of the torque rods are furnished and
welded into position on the axle housings by vehicle manufacturer or the axle manufacturer. A
two-piece torque rod is also available to cut and weld to the desired length, see Hendrickson
publication 45745-148.
Straddle mount torque rod end attaching fasteners are furnished by the vehicle manufacturer.
It is important that the tightening torque of the locknuts be checked during preventive mainte-
nance service. Follow the vehicle manufacturer's specifications for torque values.
Hendrickson Suspension recommends Grade 8 bolts, hardened flat washer and Grade C
locknuts be used for all straddle mount torque rod attachments.
The longitudinal rod is strad-
dle/straddle mount, and the
transver se rod it straddle
mount / taper pin mount, as
shown in Figure 6-9.
Whether the bushings are
straddle mount or taper pin
mount, (see Figure 6-9) they
can be replaced by press-
ing out the worn bushing and
installing a new genuine Hendrickson bushing. Refer to the technical procedure for the proper
replacement instructions for your specific suspension system.
FIGURE 6-9
17
HN ® FR Series
Preventive Maintenance