BOOM MAINTENANCE SERVICE MANUAL 1400A
4-10 1-21-2019 Control # 104-07
mm (0.015 inch) larger than pin diameter, bearing must
be replaced. Any cut or gouge which causes the bearing
liner to lose strands is cause for bearing replacement.
4. Clean and inspect all cable assemblies according to wire
rope inspection procedures in this section. Pay
particular attention to any wire breakage at the end
connections.
5. Replace cable assemblies as required. Lubricate all
cable assemblies as required. Lubricate all cable
assemblies before reinstalling them in boom.
6. Inspect all sheave pins for nicks, gouges or pitting due to
rust in the bearing surface area. Replace if any damage
is evident.
7. Inspect all grease fittings and grease paths in pins to
ensure proper grease flow. Clean and replace as
required.
8. Replace all lubricating plugs in all wear pads.
Five Section Boom Assembly
1. Assemble the sheaves into 5
TH
section sheave case.
Install the top sheave to the left side of the boom with the
spacer to the right side.
2. Attach the rear wear pads to the bottom of the 5
TH
section. Use loctite 243 blue on all wear pad mounting
capscrews.
3. Position the 5
TH
section boom in front of the 4
TH
section
boom.
• Route the 5th section extend cables through the 4
TH
section boom.
• With the threaded end of the extend cable at the
rear of the 4
TH
section and the button end out the
front, loop the front button end of the extension
cable beyond it’s anchor point on the 5
TH
section
and install the button end into 5
TH
section boom.
4. Install 5
TH
section retract cable button end into anchor
point in 5
TH
section
• Install the keeper plate and capscrews. The keeper
plate locks both the extend and retract cables in
place.
• Coil 5
TH
section retract cables temporarily into 5
TH
section
5. Install 5
TH
section into 4
TH
section about 100 cm (3 feet).
Take care not to damage 5
TH
section extend cables.
They should be laying on the extended lip of the bottom
plate of the 5
TH
section.
6. Install 5
TH
section extend sheave pins and bearings into
the 5
TH
section extend sheaves.
• Install wear plugs into the holes on each side of the
extend sheaves.
• Loop 5
TH
section extend cables around the 5
TH
section extend sheaves and slide the sheaves
between the 4
TH
and 5
TH
boom sections. Make sure
the grease hole in the pin is orientated correctly
before attaching pin to 4
TH
section.
• Install the countersunk capscrews attaching 5
TH
section extend sheave pins to 4
TH
section.
7. Raise the 5
TH
section against the top of the 4
TH
section
and install the bottom wear pads between the 4
TH
and
5
TH
sections. Lower 5
TH
section onto pads.
8. Install side wear pads with appropriate shims on front
inside of the 4
TH
section boom.
• Install the upper spacer bar and cable guide with
wear pad and related hardware on the top of the 4
TH
section.
• Shim per removal tags or according to calibration
instructions.
9. Push the 5
TH
section completely inside the 4
TH
section
until it bottoms out on the doubler plates in the rear of the
4
TH
. Keep 5
TH
section extend cables tight when installing
the section. A scribe mark on the 5
TH
at full retraction
aids in the cable tensioning for proper boom sequence
later.
10. Uncoil 5th section retract cables out of 5
TH
section.
• Assemble 4
TH
section retract sheaves and pins into
the inside of the 4th section rear with the proper
hardware and Loctite 243.
• Reeve the cable over sheave.
• Install the upper keeper capscrew and lower rear
pad. This pad serves as a cable keeper.
5
TH
Section
Extend Cable
4
TH
Section
Cable Thread
Cable Button
Cable Anchor
5
TH
Section Boom
FIGURE 4-3
Fo
r
Reference
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