TM 5-3810-289-12
Chart 3-1. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
a. Hoist brake grabbing.
a. Adjust brakeband (para 3-30).
17. Clamshell operates erratically.
b. Clutches grabbing.
b. Adjust clutch (para 3-29).
c. Lack of lubrication.
c. Lubricate (see LO).
18. Clamshell bucket fails to close.
Closing line jammed in sheavens.
Lower bucket and free line.
19. Clamshell bucket fails to open.
Holding line jammed in sheavens.
Lower bucket and free line.
a. Dump cable not adjusted
a. Shorten or lengthen dump cable
20. Dragline not operating properly.
properly.
until proper operation is obtained.
b. Fairlead rollers and sheaves.
b. Lubricate (refer to LO).
a. Dipper trip cable jammed.
a. Check dipper trip cable reeving (fig.
21. Shovel bucket fails to open.
b.
b. Check bar (fig. 2-26).
Dipper latch bar bent.
a.
a. Remove foreign material.
Door or latch jammed.
22. Shovel bucket fails to close.
b.
b. Operate handle.
Dipper trip handle stuck.
a.
a. Correct the dipper pitch (fig. 2.26).
Dipper pitch not correct.
23. Shovel not operating properly.
b.
b. Adjust crowd brake (fig. 2-21).
Crowd brake not adjusted.
a.
a. Replace cable in sheave groove.
Cable out of sheave groove.
24. Backhoe not operating properly.
b.
b. Adjust brake (para 3-30).
Brakeband dragging.
Section V. MAINTENANCE OF ENGINE CLUTCH ASSEMBLY, RELEASE MECHANISM CONTROL LEVERS, AND
TURNTABLE SWINGLOCK
3-9.
General
3-11.
Control Levers Adjustment
Instructions in this section are publishes the
information and guidance of the operator to maintain the
Adjust linkage by tightening or loosening adjusting nuts
crane-shovel.
on rod ends or adjustable devices; adjust until control
levers are in a vertical position when in neutral and alined
3-10.
Clutch Assembly
with each other in the main lever bank (fig. 3-4).
a. General. The main engine clutch (fig. 3-2) should
3-12.
Swing Lock Adjustment (fig. 3-5)
engage smoothly with a distinct snap and reasonably
hard lever action. It should be adjusted at the first sign
a. Pull the swing lock lever back and check the
of slippage.
engagement of the lock between the teeth of the fixed
gear ring. The lock should extend at least half way along
b. Inspection (fig. 3-3). Check to see if operating
the teeth profile; if it does not, put the control lever in the
clutches hold securely when engaged and are
forward position, remove pins "A" and "B" and unscrew
completely free when operating levers are in neutral
the adjusting screw one or two turns.
position. Check operating linkage for wear and proper
operation, and see that connecting pins and bolts are
b. Reassemble the pins in the toggle links and
secure.
check that the lock does not foul the top of the teeth.
c. Service. The engine clutch pilot bearing be
c. Swing the revolving frame and ensure that there
sealed-type or may be greased sparingly 50 hours of
is clearance between the lock and the gear ring all
operation. Remove chain case to determine if shaft has
around.
a pipe plug or lubrication fitting. (Sealed bearings will be
replace every time clutch is disassembled.)
3-7
