Malfunction
Probable cause
Corrective action
12.
Oil pressure indicator inoperative
a. Loose electrical connections
a. Tighten all connections. See that ground
is good.
b. Replace (para 3-84).
c. Defective indicator
13.
Ammeter Inoperative
a. Battery cables loose or corroded
a. Remove corrosion and tighten cables
b. Dead batteries
14.
Starter motor inoperative
a. Loose electrical connections
a. Remove corrosion and tighten battery
cables (para 3-75) and at solenoid.
Replace defective cables.
b. Starter push switch defective
c. Batteries defective
d. Defective starter motor
15.
Lights are dim or do not light
a. Defective lamps or lights
defective light (paras 3-173 thru
b. Short in wiring
c. Batteries dead
d. Test. Replace defective component (paras
regulator
3-77 thru 3-80).
16.
Revolving frame teeters, or will
a. Hook rollers out of adjustment or
not owing
worn excessively
3-118 and 3-119).
b. Swing brake lock engaged, or out
of adjustment
c. Swing jaw clutch out of adjustment
17.
Boom will not lower
a. Boom hoist pawl still engaged
b. Brake does not release
b. Adjust boom hoist lever and linkage
18.
Crane-shovel does not steer
a. Steering gear not engaged
properly
b. Steering linkage, clutch, or brake
out of adjustment
19.
Cables twisted
c. Twisted during installation
a. Unwind cable from drum and rewind.
b. Too much slack
b. Refer to applicable front end attachment
reeving diagram and reeve correctly.
20.
Cables wear rapidly
a. Sheave(s) dragging or defective
a. Lubricate (LO 5-3810-206-12), or re-
place defective sheave bearing or shaft
(refer to applicable front end attach-
ment paragraphs).
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 sheave
a. Improper operation
a. Operator must center boom point
overload (para 2-28).
b. Improper operation
b. Do not allow cable overrun when dropping
clamshell or dragline (pares 2-29 or 2-30).
c. Improper reeving
a. Refer to applicable front end attachment
reeving diagram and reeve correctly.
22.
Backhoe front end attachment
a. Cable out of sheave
does not operate properly
b. Improperly reeved
c. Dipper digs incorrectly
c. Adjust pitch brace (para 429b).
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
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. 29).
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
3-43
