TM 55-1925-284-14&P
0016 00
2. Once parallel alignment is achieved, install the two bolts (figure 4, item 1) in the blower sheave (figure 4,
item 2).
3. Install the belt (figure 1, item 10) on the motor sheave (figure 1, item 11) and the blower sheave (figure 1, item
12).
4. 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).
5. Tighten the four bolts (figure 1, item 6).
6. Check the belt tension several times during the first 50 hours of operation. Adjust if necessary. Use the
Adjust Belt procedure in this work package for checking tension and adjusting the belt.
7. Position the belt guard (figure 1, item 4) over the studs (figure 1, item 3) on its base (figure 1, item 5) and
secure it with the four nuts (figure 1, item 1) and four new lockwashers (figure 1, item 2).
8. Perform the Follow-On Service procedure at the end of this work package.
ANGULAR 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 angular 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, proceed to step 5. If the sheaves are aligned, proceed to step 5 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).
ASSEMBLY
1. Place the 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.
2. Keeping the suitable straight edge on the sheaves (figure 3, item 2), 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).
3. Verify that the angular misalignment has been corrected. If angular misalignment is not corrected, repeat
steps 1 and 2 until it is.
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