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Delta - Three Dimensional Breakaway
Initial setup
1. Open the boom fully into the working position
and lower to a good working height.
2. Close the ball valves on the two hydraulic lift
cylinders for safety purposes.
3. The main hinge mounting plate must be a specific
distance from the boom end plate. Measure from
the centre of the closest retaining bolt to the
boom end plate. This must measure 160 mm as
shown in the diagram.
4. The bottom mounting plates must have a 4
mm gap between them. This can be adjusted by
loosening the retaining bolts and sliding these
plates to achieve the required gap.
5. The turnbuckle must now be adjusted. This
determines the initial breakaway force required
when an object is struck.
Measure from the top of the bottom boom
chord to the centre of the pivot bolt 'A'.
Measure from the top of the bottom cord to the
centre of pivot point 'B'.
Subtract measurement 'A' from measurement 'B'.
This must be 17-18 mm. If this is less than 17
mm, shorten the turnbuckle. If it is greater than
18 mm the turnbuckle must be lengthened.
6. The spring tension must be adjusted so there is
a 1-2 mm gap between the coils. This applies the
ideal amount of resistance when breaking away.
The spring tension can be adjusted by tightening
or loosening the adjustable eyebolt.
To check the tension a spring scale can be used
by hooking it on the boom tip. It should require
about a 5 kg force to breakaway.
Maintenance
Two factors are critical in ensuring the breakaway
functions correctly. The vertical measurement (17-18
mm) shown in step 5, and the tension of the spring.
Should the spring eyebolt reach maximum
adjustment without applying sufficient tension on
the spring, the spring may need to be replaced or
the hinge mounting plate may need to be moved
closer to the end of the boom. If either of these
adjustments are made, the turnbuckle must be
readjusted.
58 - Chapter 9 - Delta Boom
To ensure smooth and long lasting operation of your
breakaway mechanisms, and to avoid premature
failure of components, they must be oiled every 8
hours.
160mm
A
B
4 mm gap
Oil plates every 8 hours
Prairie 1500-3000L Operator's Manual MY17-MY19 - REV 0
Spring tension adjuster
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