TM 11-5895-1551-23P
any kind are a delicate and skilled operation. Boom
tenance officer in charge must make this decision.
welding must be performed only by a thoroughly trained
and skilled welder trained in boom repair. Any indication
9-13. Replacement
of structural failure of any boom component should be
Refer to TM 5-3810-294-10 for crane boom replacement
cause for considering replacing the boom section rather
procedures.
than repairing it. The main-
Section V. REPAIR OF SHOVEL AND BACKHOE ATTACHMENT
backhoe front attachment main members, they may be
9-14. Repair of Shovel Dipper Stick
repaired as follows:
Sheave repair is covered in paragraph 9-10. If severe
a. Drill a hole at the ends of the crack to stop
wear is observed on the dipper stick of the shovel
further cracking from proceeding down the boom.
attachment, this condition can be repaired. When
b. Repair the crack by welding, being careful to
adjusting shovel saddle block to wear plate clearance as
make sure that the correct type of weld rod and welding
described in TM 5-3810-294-10, the thickness of the
procedures are used.
dipper stick is measured at three points, the upper third,
c.
Replace the component if the crack has
the middle third, and the lower third of the dipper stick. If
extended into the boom foot pin bore, or other vital load
there is a difference of more than 3 / 64 inch in the
bearing areas.
thickness of the dipper stick at the three points
9-16. Replacement
measured, the dipper stick should be replaced or
repaired. To repair, build up the low spots with stainless
Refer to TM 5-3810-294-10 for shovel and backhoe
steel weld and grind the stick back to uniform
attachment replacement procedures.
dimensions.
9-15. Repair of Shovel and Backhoe Attachments
If cracks are noted in the shovel front or the
Section VI. REPAIR OF FAIRLEAD ASSEMBLY
9-17. Description
9-19. Cleaning, Inspection, and Replacement
The fairlead provides a straight line pull to the dragline
Sheave repair is covered in paragraph 9-10. Always
bucket. It is reaved from the bottom of the front drum to
clean all parts with a suitable solvent before inspection or
the drag bucket.
repairs are attempted. Refer to figure 9-3 and replace
any damaged or excessively worn part of the fairlead.
9-18. Removal
Refer to TM 5-3810-294-10 and remove the fairlead
assembly.
KEY to fig. 9-3.
13.
Nut
1. Washer (2)
14.
Sheave shaft bearing (4)
2. Roller guide bearing (2)
15.
Grease fitting (4)
3. Guide roller (2)
16.
Key (2)
4. Roller guide bearing (2)
17.
Sheave shaft (2)
5. Washer (2)
18.
Sheave (2)
6. Capscrew
19.
Cross tube
7. U-bolt (2)
20.
U-bolt (2)
8. Cross tube shim (4)
21.
Nut (4)
9. Lockwasher (4)
22.
Washer (4)
10. Nut (4)
23.
Lockwasher (8)
11. Grease fitting (4)
24.
Capscrew (8)
12. Roller shaft (2)
25.
Housing
9-6
