TM 9-2330-356-14
(6) Connect four hoses to broke air chambers as
WARNING
tagged.
Release air pressure from both air reservoirs
(7) Install wheels (pars 4-49).
before doing any work on brake lines or other
pressurized air lines.
(8) Remove supports and jacks.
(5) Release air from both air reservoirs by
M970A1 including M970 SN TC-0843, TC-0844,
opening drain cocks on bottom of reservoirs (fig. 4-79).
and TC-103 thru TC-178).
Tag and disconnect the four hoses from brake chambers on
a
Removal (Fig. 5-5).
both axles on side which is raised to allow for removal of
the spring assembly.
(1) Position semitrailer on hard level surface with
front resting on landing gear.
WARNING
WARNING
If spring assembly Is seized in spring seat,
jack the rear axle higher to lift the spring. Be
Release air pressure from both air reservoirs
careful not to lift semitrailer off the supports
before doing any work on brake lines or other
under the frame.
pressurized air lines.
(6) Remove four nuts and washers from the two
(2) Release air from both air reservoirs by
U-bolts. Remove the U-bolts and spring saddle. Loosen
opening drain cocks on bottom of reservoirs (fig. 4-79).
two screws which clamp the spring assembly in the spring
seat. Pry spring assembly from spring seat.
(3) Loosen wheel lug nuts while wheels are on
ground.
(7) Disconnect upper torque rod (para 5-11)
(4) Jack up rear of semitrailer and support under
from rear axle and revolve the axle rearward to allow for
frame securely until weight of semitrailer is removed from
removal of the spring.
springs and axles.
(8) Use a lifting device to lift the spring from the
(5) Remove wheels from both axles (pars 4-49).
spring guide bracket on the axle, and remove it from the
semitrailer.
(6) Remove both axles (para 5-15).
Installation (Figs. 5-3 and 5-4).
b.
(7) Position a jack under the trunnion tube close
to the inside of each trunnion hanger.
(1) Lubricate the spring bearing plate. Insert end
of spring, larger leaf down, into spring guide bracket on
(8) Raise jacks just enough to support trunnion
forward rude.
tube.
(2) Position spring on spring seat so center, bolt of
(9) Remove four nuts, four washers, and four
spring is over reccess in spring seat. Press or drive the spring
bolts which fasten the trunnion hanger to the mounting
into place. Ensure that the spring center bolt is in the
bracket. Repeat for opposite side.
recess and the spring is firmly seated.
(10) Slowly lower suspension and support
(3) Put the spring saddle in position on the
trunnion tube.
spring. The nut on the center bolt fits into the recess on
the saddle. Install U-bolts over saddle and through holes
b.
Disassembly (Fig. 5-5).
in spring seat. Install four washers and nuts on U-bolts and
tighten evenly to 200-320 lb.-ft. Tighten the two screws
(1) Use lifting device to support spring.
which clamp the spring to the spring seat to 650-750 lb.-ft.
(2) Remove four nuts and four washers from
(4) Using jacks under rear axle, revolve the rude
u-bolts.
rearward so end of spring will enter guide bracket on axle.
Release jacks after spring clears the guide bracket.
(3) Remove two U-bolts and wear plate.
(4) Using lifting device, lift spring from upper
(5) Connect the upper torque rod to bracket on
trunnion hub and remove it from the suspension.
rear axle (para 5-11).
Change 3
