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2. The first stage yaw angle should be ad usted
such that it points 50 mm forward of the centre
section. A string line can be used as a guide.
Alternatively, it may be helpful to observe the
boom from underneath as the bottom chords are
50 mm wide all along the stages and provide a
visual reference for the offset amount.
3. The two open slots in the shim plates should be
facing downward when inserted to sit on the
loosened but not fully removed bolts. Insert or
remove shims by trial and error until the 50 mm
offset has been achieved. Replace and tighten all
nuts, bolts and washers (18 & 19 mm spanner/
socket).
SECOND STAGE
• The second stage yaw angle is adjusted using the
two stopper bolts and catch at pivot B.
90 - Chapter 9 - Boom
t ent
1.
Loosen the lock nuts on the upper and lower
stopper bolts. Back the stoppers off so that they
are not touching the second stage (1
spanner).
2.
The catch position should be extended or
retracted to place the end of the second stage
5 mm in front of the end of the first stage.
Loosen the lock nut on the catch on the side to
be shortened and tighten the nut on the side to
be lengthened (1
1
/
" inch spanner).
2
3.
Once the catch is in the desired position, wind
out the upper and lower stoppers to touch the
second stage. Check that the catch hooks are
just barely touching to ensure smooth operation
of the mechanism.
4.
Re-tighten the lock nuts on the stoppers (1
inch spanner).
THIRD STAGE
• The third stage yaw angle is adjusted using the
stopper bolt on the end of the damper at pivot C.
1.
Loosen the lock nut on the stopper. Wind the
stopper out to push the third stage forward or
wind it in to let it come backwards (1
spanner).
2.
Once the position has been adjusted such that
the end of the third stage sits 50 mm in front of
the end of the second stage, re-tighten the lock
nut on the stopper (1
Prairie Pro Operator's Manual MY19 - REV 2
/
" inch
1
2
/
"
1
2
1
/
" inch
2
/
" inch spanner).
1
2
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