User's Manual
6
Date of Origin – 02/01/08
AIR BRAKE SYSTEM
Your new Timpte trailer is equipped with an air brake system which meets or exceeds the require-
ments of the federal regulation FMVSS-121 for grade-holding ability and emergency stopping in
the event of an air supply failure in the service brake system. Air pressure is required to release
the parking/emergency brake. As of 10/8/92-FMVSS 121 requires that the supply line for the air
brake system be protected to 70 psi. This pressure level requires that supply line pressure levels
are achieved before the pressure protection valve opens (opening pressure must be higher than
the closing pressure by design).
Keeping your compressor cut-in pressure at maximum levels (over 100 psi) is a clear advantage
for peak operation of your entire system, we recommend using a 105 psi cut-in governor setting.
Governor cut-out pressure should be at 120 psi minimum. Low compressor cut-in pressure may
result in poor performance of the system, for example slow parking brake release time.
Should you still have a problem with your brake system after working through all of the inspection
items and tests listed in this manual’s maintenance section or in the brake manufacturer’s manual
supplied with the trailer, contact your Timpte factory representative.
WHEEL NUT TORQUE
Proper torquing and retorquing the wheel nuts are critical to prevent the loss of wheel equipment.
Wheel nuts should be torqued to 450 to 500 ft. lbs. (dry). Refer to the manufacturer’s decal on the
side of the trailer or manufacturer’s maintenance information supplied with the trailer for proper
torque specifications and tightening sequence.
Wheels must be checked and retorqued after the first 50 to 100 miles of use. This is important
every time you change a wheel. Check the fastener torque on a regular on-going basis.
WARNING
!
1. Read and understand this warning and the installation, Service and Safety Instruction Manual to understand
all safety precautions, proper operation, and maintenance of your Webb hub. Failure to do so could result in
death or serious injury and could result in a compromise of your vehicle’s safe operation through loss or failure
of a wheel or the compromise of the braking system. Copies of the installation, Service and Safety Instruction
Manual are available, free of charge, from Webb Products, Inc., upon request.
2. Always use a properly installed calibrated torque wrench to assure proper torque. Under torque and over
torque can cause thread and/or nut damage and could result in the loss of a wheel. Failure to ensure proper
torque could result in death or serious injury and could shorten the expected life of this product.
3. Recheck torque after the first 50 to 100 miles of service. Parts may seat naturally, causing the torque to drop.
A drop in torque could result in the loss of a wheel. Proper torque is essential to avoid damage or compromise
of your vehicles safety. Failure to ensure proper torque could result in death or serious injury.
2310 INDUSTRIAL DRIVE, S.W.
CULLMAN, ALABAMA 35055
256-739-6660 WWW.WEBBWHEEL.COM
HUBS
(FOR PILOT MOUNTED DISC WHEELS)
8 - 10 STUD HUBS
APPLIES TO M22 X 1.5 STUDS / TWO PIECE FLANGE NUT.
All threads are right hand metric.
Tighten Flange Nuts to 50 ft.lb. using sequence
shown.
Check Disc-Wheels for proper positioning on pads
and proper seating against flange.
Tighten Flange Nuts to recommended torque using
sequence shown.
RECOMMENDED TORQUE: 450 - 500 FT. LBS.
REAR IMPACT GUARDS
As of 1/26/98, all trailers must comply with FMVSS 223 and 224, which specify equipment and
performance standards for rear impact guards on new semi-trailers. If required by this statute, a
RIG (rear impact guard) has been installed on your trailer that has been designed to resist speci-
fied forces and absorb energy at a specific rate in the event of a rear collision with the trailer per
the standard. Trailer RIG’s are subject to impacts and stress in docking and loading operations.
It is therefore important that you inspect them regularly for signs of damage or wear. Failure to
follow this warning could result in serious injury or death.