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Adjusting the front fold cable (All booms)
The performance of the SPB/SPC boom while spraying depends very
much on the front fold cable adjustment. A correctly adjusted cable will
also control the movement of the outer section.
±
WARNING! The rear cable can snap and injure you or someone
else if tensioned when the boom is unfolded. Always adjust the
front cable first - with the boom unfolded and the rear cable last
- with the boom folded in transport position.
1. Unfold the boom.
2. Check security of turnbuckle anchors to its hinges.
3. Secure a straight edge (A) to the top of the boom near the middle
of the front cable. Make sure that the straight edge is above, or just
touching the cable, without deflecting it. Accurately measure the
distance from the bottom of the straight edge (D) to the top of the
cable (B).
4. Suspend a 10 lb (4.5 kg) weight (C) (HARDI® part #61007503) from
the cable directly below the straight edge and re-measure the
distance. The difference between the two measurements should
be 1/4" - 3/8" (6 - 10 mm) for all booms except 120'/90' Dual Fold
boom, which needs to be 1/8" - 1/4" (3 - 6 mm).
If adjustment is needed:
5. Loosen jam nuts (E) on the turnbuckle assembly and adjust
turnbuckle (F) for proper cable deflection.
6. Tighten jam nuts (E) again and remove weight.
±
WARNING! Check boom alignment again. If front cable was
tightened, the wing assembly will move a bit forward. If front
cable was loosened, the wing assembly will move a bit rearward.
Therefore, adjust fold cylinder, if necessary, as described in the
section "Alignment of center section and inner wing sections".
Breakaway section adjustment (45'-66' SPB)
The function of the breakaway section is to prevent or reduce boom
damage, should it strike an object or the ground.
Check that the lower nut (A) is fully tightened. The breakaway should
release with a force of 18 lbs (80 N) at the extremity. Please note that the
clutch must be well greased before adjustment is commenced.
To adjust, loosen jam nut (B). Tighten nut (C) to stiffen clutch action.
Tighten jam nut (B) after adjustment.
ATTENTION! Properly lubricate clutch assembly before adjusting
the tension. Bolts (D) must be torqued to 40 Ft/lb (55 Nm) every
40 hours to prevent boom damage. Lubricate every 8 hours to
ensure maximum performance and life.
6 - Maintenance
6.7
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