Manitowoc National Crane NBT40 Series - Multi-Stage Extend Cylinder

4
10
National Crane Published 8-01-2017 Control # 287-11 4-43
NBT40 SERVICE MANUAL BOOM MAINTENANCE
EXAMPLE
MULTI-STAGE EXTEND CYLINDER
1. After cylinder has been disassembled from boom, place
on supports and place drain pan under holding valve.
2. Using hydraulic power (porta power or crane circuit)
extend cylinder sections approximately 24 in. If stages
H
i
-H
o
-twp
-twp
Clearance
Bottom shims
Final Clearance
=
=
=
=
=
=
=
19.38
-17.88
- 0.75
- 0.50
0.25
- 0.19
0.06
H
i
= 19.38 AT FRONT
19.38 AT BACK
NEAR CYLINDER
ANCHOR BARS
H
0
= 17.88
FIGURE 4-22
1ST STAGE
2ND STAGE
3RD STAGE
FIGURE 4-23
Reference Only