Boom Repair - Manitowoc Grove CD3340B Service Manual

CD3340B/YB4411
3rd Boom Section
Bottomed Against 2nd
Boom Section
P0680
4. When the boom has extended slightly, remove the pipe
wrench and fully retract the booms. Check that the 3rd
boom section has bottomed against the 2nd boom
section. Repeat steps 3 and 4 until the booms bottom
against each other.
P0826
GROVE
2nd Boom Section
Bottomed Against 1st
Boom Section
FIGURE 11-4
Castle Nut Location
FIGURE 11-5
Published 04/07/2015 Control # 569-00
P0829

Boom Repair

Removal
1. Lower the boom to lowest position. Fully retract the
booms.
2. Lower the drop block to the ground.
3. Disconnect the wedge assembly from the boom head to
free the hoist wire rope.
4. Unwrap the wire rope from the drop block sheaves and
the boom head sheaves. Wind the wire rope onto the
hoist drum.
5. Disconnect the anti-double blocking system electrical
wire from the electrical swivel on top of the hydraulic
swivel, or if installed, disconnect the rated capacity
limiter (RCL) wire from the electrical swivel.
6. Place a suitable container under the bulkhead fittings at
the base of the boom assembly. Disconnect the two
telescope cylinder hoses from underneath the boom at
the bulkhead fittings and drain oil into the container.
NOTE: Use at least a 1.8 Metric Ton (2 ton) overhead
crane when lifting the boom assembly. Be sure
slings and/or chains are capable of handling 2 tons
(1.8 Metric Tons).
7. Using an over head crane and sling or chain
arrangement support the boom assembly.
8. Support the lift cylinder by placing a piece of 2 x 4 wood
board between lift cylinder load hold valve block and the
turntable base or support above with another overhead
crane. This will support the cylinder when the rod end
pin is removed.
9. Remove the cylinder rod end pin.
STRUCTURAL
11
FIGURE 11-6
11-5