DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 76 / 163

Maintenance Manual DG-808C
Issued: May 2010 TN800/41 4.15
4.12 Mounting and tensioning of the drive belt
please refer to drawing 8M110 (enclosed in MM)
a)
Tensioning of the drive belt
1. Tensioning and loosening of the drive belt is accomplished by
turning the eccentric axis 8M115, which carries the upper drive belt
pulley, against the propeller mount (carbonfibre tower).
2. Remove the engine retaining cable from fork 8M119.
Caution: Let cable retract slowly, otherwise the retraction bungee may jump
from its pulley located inside the rear end of the fuselage.
3. Mark the actual position of axis 8M115 by marking the position of
fork 8M119 at the propeller mount.
Caution: Turn the pulley into such a position that there is no risk that the
actuators touch and damage the proximity switch when loosening the pulley.
4. Remove the 6 mounting bolts which fix the flange of axis 8M115 to
the propeller mount (5 x bolt with hexagonal head, 1 x countersunk
screw).
5. Turn the assembly applying a 22 mm open end spanner at the fork
8M119 until the next mounting hole in the flange of axis 8M115
appears. Therefore press the pulley in upward direction at its front
end. Rotation in clockwise direction increases the belt tension (view
from the back, in flight direction).
6. Continue with item f).
b) Indication for drive belt tension
If the belt with axis 8M115 screwed into place is not quite tensioned,
the flange of the axis must be rotated up to the next but one mounting
hole (see a) 5.) to tension the belt.
After assembling of the flange measure the drive belt tension according
to section g) and adjust if necessary.
c) Exchanging the drive belt
In addition to a):
1. Remove the propeller
2. Remove the front retaining rings of upper and lower drive belt
pulleys.
3. Remove the carbonfibre fairings (drive belt covers) from the
propeller mount.
4. Disassemble gas-strut and spindle drive from the propeller mount.
Caution: Regard the instructions in section 4.14 and 4.21.
5. When reassembling mount the axis 8M115 2 mounting holes prior to
the marked position. Fix the axis with min. 2 mounting bolts.
6. Check and if necessary correct the drive belt tensioning see b).