TM 55-1925-284-14&P
0016 00
5. Inspect the belt (figure 1, item 10) for damage, including signs of wear, tears, cuts, and nicks. Replace the
belt if any of the conditions listed are present.
ASSEMBLY
1. Slide the motor (figure 1, item 7) away from the blower (figure 1, item 9) until the proper belt tension is
achieved. Proper tension is achieved when the belt may be deflected 1/2 inch (13 mm) at its midpoint
(figure 2) when applying approximately 4 to 5 pounds (1.8 to 2.3 kg) of force to the belt. A new belt
should be tensioned tighter (approximately 3/8 inch (10 mm) deflection).
2. Tighten the four bolts (figure 1, item 6).
3. Perform the Sheave Alignment procedures in this work package.
4. Check the belt tension several times during the first 50 hours of operation. Adjust if necessary. Use the Belt
Replacement Installation procedure in this work package for checking tension and adjusting the belt.
5. Perform the Follow-On Service procedure at the end of this work package.
PARALLEL SHEAVE ALIGNMENT
DISASSEMBLY
1. Remove the four nuts (figure 1, item 1) and four lockwashers (figure 1, item 2) from the studs (figure 1,
item 3) that secure the belt guard (figure 1, item 4). Discard the lockwashers.
2. Remove the belt guard (figure 1, item 4) from its base (figure 1, item 5).
3. Check for parallel sheave misalignment (figure 3) by placing a suitable straight edge (figure 3, item 1) against
the machined surface of the sheaves (figure 3, item 2). Ensure that the straight edge is perpendicular to both
shafts while maintaining contact.
4. If the sheaves are not aligned, remove the two bolts (figure 4, item 1) on the blower sheave (figure 4, item 2).
If the sheaves are aligned, proceed to step 2 of the assembly procedure.
5. Loosen, but do not remove, the four bolts (figure 1, item 6) that secure the motor (figure 1, item 7) to its base
(figure 1, item 8).
6. Slide the motor (figure 1, item 7) towards the blower (figure 1, item 9) until the belt (figure 1, item 10) is loose
enough to be removed from the motor sheave (figure 1, item 11) and the blower sheave (figure 1, item 12).
7. Remove the belt (figure 1, item 10) from the motor sheave (figure 1, item 11) and the blower sheave
(figure 1, item 12).
8. Install one of the bolts (figure 4, item 1) in the forcing hole (figure 4, item 3) and tighten until the blower sheave
is freed from the blower shaft (figure 4, item 4).
9. Remove the bolt (figure 4, item 1) from the forcing hole (figure 4, item 3).
0016 00-4