AIR SUSPENSION
RIDE HEIGHT AND BLOCK
Brake Size
Ride Height
Block Height
12-1/4" Dia.
3.5"
3"
16-1/2" Dia.
5.5"
5"
d.
Lower the trailer by exhausting air from the
air springs by moving the control arm to the
“down” position (about 45°) until the axle tube
is resting on the block.
e.
Check the ride height to make sure it is cor-
rect. Consult Landoll Service Center if correct
height cannot be obtained.
f.
Loosen the 1/4" adjusting lock nut located
on the adjusting block, allowing the control
arm to move approximately 1 inch. Move the
adjusting block until holes align, then insert lo-
cating pin.
(See Figure 4-4)
.
g.
Align the control arm linkage to the control
arm lower bracket and re-tighten the 1/4" ad-
justing lock nut to 2-4 ft.lbs. The ride height
valve should now be correctly adjusted.
h.
Remove the locating pin.
i.
The block can now be removed by using the
height control valve as an improvised jack by
disconnecting the control arm at the lower
bracket and pushing the control arm to an
“up” position.
j.
Remove the block and reconnect the link-
age. This allows the Automatic Height Control
Valve to resume normal operation.
k.
Check the air ride height. If necessary, go
through the adjustment procedure again until
the proper air ride height is achieved.
l.
Check the air ride height periodically and
adjust as needed.
CAUTION
INSURE SUSPENSION AIR CYLINDERS
ARE INFLATED ON ALL AXLES. FAIL-
URE TO DO SO CAN CAUSE EXCES-
SIVE TIRE WEAR.
m.
Should the front and rear axle suspension
air spring (E) not be inflated or feel soft by the
time the undercarriage has reached transport
position, adjust front and rear axle height con-
trol valves as follows:
1.
Adjust front axle control valve linkage to
position (pin) control valve arm at center
position of valve when front axle is
approximately 1/2 inch from full down
travel.
2.
Adjust rear axle control valve linkage to
position (pin) control valve arm at center
position of valve when rear axle is
approximately 1/2 inch from full up travel.
n.
These adjustments may vary with different
tractor fifth wheel heights.
4-11
Figure 4-4 Air Ride Height Adjustment
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...
