TM-5-2330-378-14-P
SEMITRAILER, LOWBED: 40 TON CONSTRUCTION EQUIPMENT TRANSPORTER M870 AND M870A1
TECHNICAL MANUAL; OPERATOR'S, UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
JUNE 1999
TM-5-2330-378-14-P - Page 294 of 524
TM5-2330-378-14&P
5-10. TRUNNIONTUBE REPLACEMENT(M870A1).
ThisTaskCovers:
a.
Removal
b.
Installation
Initial Setup:
Tools/Test Equipment:
Equipment Conditions:
• Field maintenance tool set (item 4, Appendix 13)
Tire and wheel assemblies removed (para 3-10).
• Tool kit, general mechanic's:
automotive
(Item 7, Appendix B)
Personnel Required:
Two
*Trestle (2) (Item 1, Appendix 13)
Materials/Parts:
• Grease (item 6, Appendix F)
• Self-locking nut (4) (item 34, Appendix 1)
a.
REMOVAL
NOTE
There
are two trunnion
tubes
on the semitrailer.
They are located
behind
the front
axle and in front of the rear axle, and run parallel to the axles. This procedure is for
replacement
of one trunnion tube.
Repeat the procedure for the other one.
1
Using hydraulic jack, lift two rear corners (1) of semitrailer until weight is off suspension system but tire and
rim assemblies still touch the ground. Put trestles under rear corners (1).
2.
Using dolly jack, support equalizing beam (2) under trunnion tube (3), but do not lift. Repeat for equalizing
beam (2) at other end of trunnion tube (3).
3.
Remove four bolts (4), washers (5), and self-locking nuts (6) from trunnion clamp (7). Repeat for othertrunnion
clamp (7). Discard self-locking nuts.
4.
Remove two trunnion clamps (7) from two equalizing beams (2).
5.
Using dolly jack, lower equalizing beam (2) until clear of trunnion tube (3). Repeat for equalizing beam (2) at
other end of trunnion tube (3).
6.
Remove two bolts (8), washers (9), and nuts (10) from trunnion bracket (11). Repeat for other trunnion bracket
(11).
7.
Remove two washers (12) and rubber bushing (13) from each side of trunnion tube (3). Mark washers to aid
in returning them to their proper location.
5-32
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