12.5. Adjust the lateral clearance of the boom and/or
hydraulic extension
Turn the bearing covers an equal amount on both sides.
Turn the covers all the way closed. Then open them one
quarter of a turn.
12.6. Adjust the chain in the telescope
ཱ
ི
ཱི
ུ
ཱུ
ྲྀ
(1) second boom
(2) chain tensioner
(3) roller
(4) chain tensioner
(5) extension 1
(6) roller
(7) extension 2
The correct tightness prevents the chains from overloading and wearing out too quickly. Correct
adjusted chains will also not jump off the grove in the roller.
1.
Retract the extensions. Lower the grapple to the ground.
2.
Loosen the adjustment screw of the top chain fastener until the chain is visibly loose.
3.
Tighten the adjustment screw of the bottom chain. Extension 2 will retract until the extensions
come in contact with each other. Check that the top chain is still loose. Loosen the adjustment
screw of the bottom fastener until a small gap is created between the nut and the second
boom and extra chain tension is removed.
4.
Raise the 2nd boom until it is level and keep the grapple near the ground. Extend the
extensions. Slightly retract the extensions (2 to 5 cm) to loosen the top chain. Leave the 2nd
boom in the air to avoid the top chain from tighten.
Maintenance and Service
Jonsered 1188S CE
79