c. Spring Suspension Axles
SPRING SUSPENSION TORQUE CHART
Size
1"
7/8"
7/8" U-
bolt
1/2"
Torque in
Ft.Lbs.
480-500
250
300
55-60
1.
Loosen the torque arm clamp bolts on the
adjustable torque arms and loosen the axle
U-bolts.
2.
Turn the adjustable torque arm on the front
axle until the proper alignment has been
achieved using the procedure outlined in
3.
Tighten the axle U-bolts to the torques
listed in the above table.
4.
Tighten the front axle torque arm clamp
bolts to the torque listed in the above table.
5.
Align the rear axle to the front axle in the
same manner using the torque arm for
adjusting. The rear axle should be parallel
with the front axle, with the dimensions Y
and Y1 being the same.
6.
Tighten the rear axle U-bolts to the torque
values listed in the above table.
7.
Tighten the rear axle torque arm clamp
bolts to the torque listed in the above table.
4-8 BRAKE SYSTEM MAINTENANCE
WARNING
1. WHEN CRAWLING UNDER THE
SEMITRAILER IS NECESSARY,
CHOCK ALL WHEELS OF THE
TRAILER AND TRACTOR. WHEN
JACKING IS NECESSARY, CHOCK ALL
WHEELS AND SUPPORT THE SEMI-
TRAILER UNDERCARRIAGE WITH
JACK STANDS SUFFICIENT TO WITH-
STAND THE WEIGHT OF THE SEMI-
TRAILER AND LOAD. FAILURE TO
TAKE ADEQUATE SAFETY MEAS-
URES MAY RESULT IN SERIOUS PER-
SONAL INJURY OR DEATH.
2. USE GREAT CARE IF WHEELS OR
BRAKE DRUMS MUST BE HANDLED.
THEY MAY BE VERY HOT AND CAN
CAUSE SERIOUS BURNS.
4-8.1
General
.
A daily general inspection will reveal the most
common problems found in the spring brake sys-
tem. This inspection should include the following:
a.
Check air hoses for chafing, bends, kinks,
or damaged fittings. Replace defective hoses.
b.
Check the brake system for loose, missing,
deformed, or corroded fasteners. Replace
and tighten defective hardware.
c.
Check brake linings for excessive wear or
distortion.
d.
Drain air reservoir daily. A drain cock on the
bottom of each air reservoir vents the tank to
drain collected water and oil. If held open, air
pressure in the tanks is relieved, causing the
emergency or parking brakes to be applied
(See Figure 4-8).
4-15
Figure 4-8 Drain Cock Locations
Summary of Contents for 317B
Page 3: ...MODELS 317B 318 319 TRAILER OPERATOR S MANUAL PURCHASED FROM DATE ADDRESS PHONE NO SERIAL NO...
Page 8: ......
Page 14: ...3 2 Figure 3 1 Front Trailer Terminology Figure 3 2 Rear Trailer Terminology...
Page 18: ...3 6 Figure 3 4 Hydraulic Controls...
Page 24: ...3 12 Figure 3 5 Steps for Loading and Unloading...
Page 30: ...3 18 Figure 3 10 Dock Leveler Operation...
Page 34: ...3 22 Figure 3 12 Front Extension Bulkhead...
Page 36: ...3 24 Figure 3 13 Rear Impact Guard and Antilock Brake System...
Page 40: ...4 2 Figure 4 1 Lubrication Points...
Page 45: ...4 7 Figure 4 2 317B 318 319 Wiring Diagram...
Page 46: ...4 8 Figure 4 3 Remote Wiring Diagram...
Page 52: ...4 14 Figure 4 6 Checking Axle Alignment CURBSIDE DRIVER SIDE Figure 4 7 Examples of Camber...
Page 56: ...4 18 Figure 4 10 Axle and Brake Assembly...
Page 62: ...4 24 Figure 4 13 Inboard Mount Hub and Drum Figure 4 14 Three Spoke Wheel and Drum...
Page 66: ...4 28 Figure 4 18 Mounting Tires and Wheels Figure 4 19 Stud Tightening Sequence...
Page 69: ...4 31 Figure 4 20 Dock Leveler Leg Assembly...
Page 80: ...5 10 NOTES...
