National Crane 600H, Service Manual

Page: 126 / 232

BOOM 600H SERVICE MANUAL
4-52
08-19-2022 Control # 092-13
21. On the inside of the 5th section at the back
(Figure 4-35):
• Place the second dust cover over the bearing on the
sheave for the retract cable.
• Route the retract cable around the sheave.
• Place the sheave over the bolt holes with the second
dust cover toward the outside of the boom.
NOTE: The side with the mark toward the center.
• Bolt the retract cable sheave to the inside of the 5
TH
section (Figure 4-37).
22. Install the wear plug in the center of the retract sheave
on both the outside and inside of the boom.
23. Bolt the cable guide at the back of the retract cable
sheave.
5
TH
, 4
TH
, 3
TH
, and 2
ND
Section Assembly
NOTE: After the 6
TH
-5
TH
-4
TH
section assembly is
completed, install the telescope cylinder.
T h e 5
T H
, 4
T H
, 3
T H
, a n d 2
N D
b o o m s e c t i o n a s s e m b l y
instructions are identical. Use the 5th section assembly
instructions for the 4
T H
, 3
T H
, and 2
N D
se ctions. The
5
TH
section assembly is a follows:
1. Bolt the back bottom wear pads to the 5
TH
(Figure 4-36)
section boom.
2. Attach the sync cables to the side of the 5
TH
boom
section as outlined below:
NOTE: See Figure 4-56 on page 4-61 for the sync cable
diagram.
• Install the sync cable into the sync clamp plate on the
side of the boom with the numbered cable stop to the
back of the section (Figure 4-38).
NOTE: Loosely bolt the clamp plates together. The bolts
need to be in far enough to miss the side of the
boom and still allow the cable to move. Do not
tighten the bolts on the sync clamp plates until after
the boom is assembled.
• Adjust the sync cable so that there is 1-1/8 in between
the edge of the sync clamp plate and the paint mark on
the sync cable (Figure 4-38).
FIGURE 4-35
Cable
Guide
Wear Plug
Mark toward the
center of the boom.
Bolt holes for the bottom
outside wear pad.
Sync Cable
FIGURE 4-36
Outside Bottom
Rear Wear Pad
FIGURE 4-37
Sheave Cable
Bolts
Cable Guide
Bolts
Bottom Rear
Wear Pad
Wear Plug
REFERENCE ONLY