Table 3-3. Troubleshooting - Continued
Malfunction
Probable cause
Corrective action
b.
Incorrectly reeved and dragging
b.
Refer to applicable front end attachment
against another cable.
reeving diagram and reeve correctly.
21. Cables Jump boom point
a.
Improper operation----------------------
a.
Operator must center boom point
sheaves
over load (para 2-28).
b.
Improper operation----------------------
b.
Do not allow cable overrun when
dropping clamshell or dragline
a.
Improper reeving-------------------------
c.
Refer to applicable front end attachment
reeving diagram and reeve correctly.
22. Backhoe front end attachment
a.
Cable out of sheave --------------------
a.
Install, cable (para 3-48).
does not operate properly.
b.
Improperly reeved-----------------------
b.
Refer to figure 2-16 and reeve correctly.
c.
Dipper digs incorrectly-----------------
c.
Adjust pitch brace (para 4-29b).
23. Clamshell bucket fails to open.
a.
Closing cable jammed in sheaves---
a.
Lower clamshell and free cable.
b.
Closing cable too short-----------------
b.
Lower boom to a horizontal position
and replace short cable with
one of proper length (table 1-2 and fig. 2-9).
24. Clamshell bucket will not take
a.
Operator holding too much tension
a.
Gradually release brake (para 2-29).
proper bite.
on hoist brake.
b.
Improper reeving (wrong cable)
b.
Lower boom to a horizontal position
and check cables (table 1-2 and fig. 2-9).
25. Crane will not lift rated capacity
a.
Hook block incorrectly reeved--------
a.
Reeve hook block with maximum
parts of the cable (fig. 2-7).
b.
Crane not level---------------------------
b.
Crane must be level, and as near
to load as possible (boom near
vertical) for maximum lift and
swing. (See capacity chart in cab
for boom angle or radius required for lift).
26. Dragline bucket will not dump
a.
Dump sheave binding -----------------
a.
Clean and lubricate cable (pars 3-43)
properly.
and sheave (LO 5-3810-201-12).
b.
Fairlead sheaves binding --------------
b.
Clean sheave throat. Lubricate
sheaves (LO 5-3810-201-12).
c.
Bucket does not dump soon enough
c.
Lengthen dump cable.
d.
Bucket dumps too soon ---------------
d.
Shorten dump cable.
27. Shovel front end attachment
a.
Clutches slipping ------------------------
a.
Adjust (pars 3-32).
does not operate properly.
b.
Dipper trip inoperative -----------------
b.
Adjust (paras 3-37 and 3-38), or
replace clutch shoes (para 4-9).
c.
Crowd chain loose---------------------
c.
Adjust (para 3-85).
28. Propel chain excessively noisy
a.
Chain loose or defective --------------
a.
Adjust (pars 3-40) or replace (pars 3-144).
b.
Worn sprocket --------------------------
b.
Replace (para 3-144).
29. Pins and bushings in crawler
a.
Crawler track too tight -----------------
a.
Adjust (pars 3-41).
track wear excessively.
b.
Crawler track too loose ---------------
b.
Adjust (pars 3-41).
30. Idler roller wear excessive--------
a.
Crawler track out of adjustment
a.
Adjust (para 3-41).
b.
Idler roller, or drive shaft, not
b.
Adjust (pars 3-41).
parallel to horizontal propel shaft.
31. Trackshoes wear excessively----
a.
Too much sag in track------------------
a.
Adjust (pars 3-41).
b.
Defective track---------------------------
b.
Replace (para 3-141).
32. Heaters do not ignite--------------- a.
Fuel strainers clogged-----------------
a.
Service heater fuel strainers (para 3-25).
b.
Defective igniter-------------------------
b.
Replace (paras 4-48, 4-44, or 4-45).
c.
Defective fuel----------------------------
a.
Replace (pars 4-46).
3-49
