50
BXTR6438
2.
If the belt requires adjustment, loosen (do not remove) the
four bolts that hold the engine mount to the main frame.
3.
Pull the engine back to snug up the belt, then tighten the
bolts on the opposite side from the belt.
4.
Turn the belt tension adjuster bolt clockwise to tighten the
belt. Turn it counterclockwise to loosen the belt. Check and
adjust belt tension accordingly. Be aware of belt alignment
when adjusting belt tension. See
Drive Belt Alignment
to
follow.
01357
Fig. 17 –
Drive Belt Tension Adjustment
5.
Recheck belt tension. Once set correctly, tighten up all four
engine mount bolts. Re-install the belt shield.
6.
Recheck belt tension after 10 hours of operation.
6.9.2 Drive Belt Alignment
Observe drive belt alignment every 8 hours of operation.
For accurate measurement use a laser alignment tool. If one is
not available, the following method can be used.
NOTE:
A straight edge at least 50" (127 cm) in length is
required.
The maximum misalignment is 1/32" (1 mm).
Place the straight edge along the back face of the rotor sheave
and engine clutch. Compare the gap between the belt along
the length of the straight edge. The gap between must be equal
along its length. Adjust accordingly.
01358
Fig. 18 –
Sheave Alignment
If the gap is not even along the length of the belt, determine
whether the engine is square to the chipper frame. It may also
be that the rotor sheave has moved in or out on the shaft. Belt
misalignment can be corrected two different ways:
-
Engine mount alignment
-
Rotor sheave alignment
Engine Mount Alignment
After changing the drive belt, the angle of the engine mount
could shift resulting in poor belt alignment.
01355
Fig. 19 –
Engine Mount Bolts
1.
Twist the engine to one side or the other on the base to
adjust engine position. Recheck belt/sheave alignment.
Repeat as necessary for the best result.
2.
Recheck belt tension and adjust if required. Tighten the
engine mount bolts.
