Landoll 325C, Operator'S Manual

Page: 31 / 80

3-26 AIR RIDE OPERATION
3-26.1 Trailer air pressure must be maintained
above 90 PSI before operating. PROTEC-
TION VALVES are used to maintain 65 PSI
air brake pressure during suspension or re-
mote system air loss.
3-26.2 The semitrailer is equipped with a ride
height control valve located on rear axle.
CAUTION
IF SUSPENSION AIR LOSS SHOULD
OCCUR, COMPLETELY DEFLATE SUS-
PENSION AND TEMPORARILY OPER-
ATE ON THE AIR SPRINGS INTERNAL
RUBBER BUMPERS. CAREFULLY
PROCEED TO THE NEAREST SEMI-
TRAILER SERVICE FACILITY. TO DE-
FLATE THE AIR SUSPENSION, DIS-
CONNECT THE LOWER CONNECTION
ON THE LINKAGE OF THE AUTOMATIC
AIR VALVES. ROTATE THE VALVE
CONTROL ARMS DOWN ABOUT 45o
TO EXHAUST THE AIR. TO RESTORE
TO NORMAL OPERATION, SIMPLY RE-
VERSE THE PROCEDURE.
3-27 DETACHABLE TRUNNION (MODEL 325)
3-27.1 Detaching the trunnion:
a. Park the semitrailer in a straight line on a
smooth, firm, level surface in an open area.
b. Set the tractor and the semitrailer brakes.
c. Place a 4" high block under the front of each
main member of the detachable trunnion.
d.
Turn the AIR HEIGHT CONTROL VALVE
(See Section 3-13) to the "ON" position.
e.
Use the HAND VALVE (See Section 3-14)
to exhaust enough air from the air ride system
to allow the front of the main members to rest
solidly on the blocks.
f. Disconnect the trunnion electrical and air
lines from the semitrailer bed and store inside
the trunnion frame.
g. Remove the four connecting bolts from the
semitrailer and trunnion bulkheads (See Fig-
ure 3-10). Use a crane, hoist, or other suit-
able lifting device to slightly lift the back of the
semitrailer bed if necessary, to provide relief
on the bolts, allowing them to be removed.
h. Using a suitable lifting device, lift the
semitrailer bed off of the trunnion loadplates.
3-27.2 Reattaching the trunnion:
a. Using a crane, hoist, or other suitable lifting
device, position the semitrailer bed in front of
the trunnion.
b. Lower the semitrailer bed until the trunnion
alignment pins are inserted into the trunnion
load plates
(See Figure 3-10).
c. Using a suitable lifting device, raise the front
of the semitrailer bed until the semitrailer
bulkheads contact the trunnion bulkheads.
d. Insert and tighten the four attaching bolts.
IMPORTANT
IT MAY BE NECESSARY TO LIFT OR LOWER
THE FRONT OF THE TRAILER SLIGHTLY TO
PROVIDE AMPLE SLACK TO INSERT THE
FOUR CONNECTING BOLTS.
e. Reconnect the air and electrical supply lines
and pressurize the towing vehicle's air system
to a minimum of 90 psi.
f.
Turn the AIR HEIGHT CONTROL VALVE
(See Section 3-13) to the "OFF" position to
return the air ride suspension to automatic
control.
3-19