Kelly 45 - Basic operation and chain tension; Module and chain tension

7574
Basic operation and chain tension
Model inches mm
45 12.4 315
Basic Operation
Unfolding:
1. Walk around and inspect the machine.
a. Check that chains are not hooked on framework
b. Check swivel bolts are in place and not broken
c. Check that height adjusting chains have not fallen out of their slotted plates during
transport.
2. Lower front A frame to working height.
3. Unfold wings holding the hydraulic lever until the tail is in working position and the main
center cylinder pins have centerd in their slots.
4. Walk around and check that all chain links are straight and that working height of all swivels is
correct for eld conditions. Adjust if neccessary.
5. Move o with all chains in working position. If neccessary it is acceptabe to raise front A pull
to transport height. This will lift the front chains o the ground and reduce the load on the
tractor. Lower the front A pull once moving satisfactorily.
Folding:
1. Lower the front A frame to working height. (This is important to ensure that all chains locate
correctly in their transport rests).
2. Fold the wings. They should move as follows; modules will raise, tail will raise, main center
cylinders will retract, one or both, until the wings stand vertically. The left outer wing then the
right outer wing will fold down.
3. Raise front A frame to transport height.
4. Walk around and check that chains have located correctly in transport rests.
(30’ only, install wing transport lock pins).
Setting for correct chain tension
Wings
Use the spanner supplied. Loosen the lock nut adjacent to the tensioner assembly body.
Turn the tension bolt clockwise to compress the coil spring. Correct tension is acheived when
spring retains its set length when operator rolls the chain fore and aft on the ground.
Retighten the lock nut.
See table below
Spring Compression Length
When less than 4” (100mm)
of thread remains visible
on the adjustor bolt then
a link must be removed
from the chain
Module and chain tension
Modules
Loosen the lock nut on the draw bolt.
Tighten the adjusting nut clockwise until the outer face of the spring retaining washer is ush
with the body of the module tensioning unit.
Retighten the lock nut.
If more than 8” (200mm) of thread is exposed then a link should be removed to maintain
correct adjustment.
Importance of chain tension
Operational
It is imperative that the correct adjustment be maintained. Only through correct adjustment can
a smooth and level nish be achieved in eld working.
Loose chains lead to :
• Uneven performance across the width of the machine
• Uneven weed control
• Unsatisfactory incorporation
• Ineective levelling
• Accelerated or premature chain wear
• Chains failing to engage with transport locators when folded
• Machine damage when folding or unfolding
• Uneven eld surface with ridges and furrows being created. The leading 1/3rd of a loose chain
is much more aggressive than the trailing 1/3rd and the center. This will mean that middle of
the machine’s front pair of chains will aggressively move soil outwards. The machine’s rear pair
of chains, if loose, have their aggressive 1/3rd near the wing extremity. It follows then that as
the front discs push soil outwards, the least aggressive portion of the rear chain follows them
and does not balance the soil movement. This is exacerbated at the wings, eectively creating a
broad ridge about halfway out each wing. It won’t be evident in one pass, but is possible if care
is not taken over time.
A correctly adjusted machine will not cause this phenomenon.