BOOM TMS700E SERVICE MANUAL
4-2 Published 01-29-2015, Control # 512-01
control flow to the telescope cylinders. With both cylinders
retracted, the check valve for the lower telescope cylinder is
open and the check valve for the upper cylinder is closed
allowing the lower cylinder to extend. When the lower
cylinder is fully extended, the check valve for the upper
cylinder opens allowing the upper cylinder to extend. The
check valve for the lower cylinder closes after the upper
cylinder starts to extend and shuts off the flow to the lower
cylinder. As the upper telescope cylinder barrel extends, the
sheaves on the end of the cylinder barrel push on the extend
cables to pull Section 4 out at the same time Section 3 is
extending.
Boom Retraction
The upper telescope cylinder retracts the Section 3 and two
retract cables pull Section 4 in at the same time. When the
upper cylinder is fully retracted, the check valve for the lower
telescope cylinder is opened and the lower cylinder starts to
retract. The check valve for the upper cylinder is closed as
the lower cylinder starts to retract.
MAINTENANCE
Removal
NOTE: The boom may be disassembled with Section 1 left
on the crane if repair of Section 1 is not necessary.
The boom weighs approximately 8246 kg
(18,179 lb). Removal of the swingaway boom
extension will simplify boom removal, therefore, the
above weight is for the boom without the
swingaway boom extension attached.
1. Extend and set the outriggers to level the crane and
ensure the boom is fully retracted and in a horizontal
position over the rear of the crane.
2. If equipped, remove the swingaway boom extension
according to the removal procedures in this section.
3. Remove the hook block or headache ball and wind all
the wire rope onto the hoist drum.
4. Elevate the boom slightly to allow for withdrawal of the
lift cylinder rod end from the lift cylinder attach fitting on
the bottom of the boom.
5. Attach a lifting device to the boom to provide for equal
weight distribution.
6. Disconnect any electrical wiring from the boom.
7. Tag and disconnect the hydraulic lines to the telescope
cylinder. Cap the lines and openings.
8. Block the lift cylinder.
9. Remove the bolts, washers, and stop plate securing the
upper lift cylinder shaft to the side of the attach fitting on
the boom.
10. Remove the upper lift cylinder shaft and two thrust
washers.
11. Activate the hydraulic system and withdraw the lift
cylinder rod enough to clear the attach fitting. For
removal of the lift cylinder from the crane refer to the
removal procedures outlined in Lift Circuit, page 4-18 -
Removal in this section.
CAUTION
Wear gloves when handling wire rope.
DANGER
Ensure all blocking and lifting devices are capable of
supporting the boom assembly.
DANGER
Ensure the boom lift cylinder is properly supported before
disconnecting it from the boom.
Reference Only
To Next Page
Loading...
Need help?
General
