TM 5-3895-374-24-1
3-3-8
Trunnions and Guide Wheels
Removal, Repair and Replacement. See figures 3-6 and 3-7.
This procedure assumes a complete removal, repair and replacement of these components A partial disassembly repair
and replacement is possible. Follow the procedure to the point of removing only those components requiring repair or
replacement.
A.
Removal and Disassembly
1.
Remove the trunnion guard on the side to be disassembled
2.
Clean the surface around the two bearings supporting the trunnion.
3.
Using a scribe, mark the bearing mounts on the outside edges of the bearing housings, lines perpendicular to the
drum. Also mark the mount on the outer edge of the bearing housing with a line parallel to the drum.
4.
Support the drum using an overhead crane and a chain or choker. The chain or choker must be positioned right
next to the drum ring that Is supported by the trunnion being removed.
5
Remove the bolts holding the bearings to the mount.
6
The trunnion assembly complete with the bearings can be removed to a bench.
7.
Remove the bearings following the procedure in Section 3-3-13.
B.
Inspection, Repair and Replacement
1.
Inspect the bearings. Replace the seals with new ones if the housing Is disassembled. Note which bearings are
fixed and be sure and put the fixing ring back In place when reassembling. Follow the procedures defined by the
bearing manufacturer In Section 3-3-13.
2.
The trunnion and shaft are one component and are replaced when worn or damaged.
3.
All fasteners should be replaced if at all possible due to the heat experienced In this area of the drum mixer.
C.
Assembly
1.
Assemble the bearings onto the shaft taking care to position the fixed bearing on the correct side. Assemble the
bearings according to instructions in Section 3-3-13
page 3-575
