Malfunction
Probable cause
Corrective action
c. Hydraulic pump defective.
c. Replace pump (para 4-21).
d. Leak in pressure line.
d. Tighten connections (para 4-21).
17. Elevating cylinder will not operate
a. Hydraulic shut-off valve not open
a. Open the hydraulic shutoff valve.
correctly
b. Clogged hydraulic line strainer
b. Remove and clean the hydraulic strainer
(para 4-24b.).
18. Hydraulic oil leaks at elevating and
Packing worn or defective.
Replace a defective cylinder (para 4-23).
leveling cylinders
19. Hydraulic filter warning light illuminates Filters dirty
Replace filters (para 4-24c.).
20. Hydraulic noise excessive
a. Pump bearings worn excessively
a. Replace hydraulic pump (para 4-21).
b. Hydraulic line strainer clogged
b. Remove and clean strainer (para 4-24b.).
21. Final drive assembly leaks
a. Loose or missing hardware
a. Inspect all hardware. Tighten or replace.
b. Oil level too high
b. Drain oil to proper level (Lube diagram)
22. Auger bores holes at incorrect angles a. Elevating and/or leveling cylinders
a. Replace the elevating or leveling cylinder
inoperative.
b. Hydraulic pump leaking
b. Replace the hydraulic pump (para 4-21).
c. Carrier hold-down bolts loose
c. Tighten carrier hold-down bolts (para 2-3).
23. Auger jumps or bucks excessively
a. Defective hydraulic pump
a. Replace the pump (para 4-21).
b. Defective leveling or elevating cylinder
b. Replace defective cylinder (para 4-23).
c. Carrier hold-down bolts loose
c. Tighten hold-down bolts (para 2-3).
24. Auger does not evacuate material
a. Loss of hydraulic pressure
a. Inspect all lines and fittings 'or leaks or
seepage ) oil. Tighten fittings. Replace
defective lines.
b.
Load on auger too heavy.
b. Raise kelly bar lever sufficiently to ease
load on auger (para 2-10 .).
Section V. TROUBLESHOOTING
Malfunctions which may occur are listed in table 4-2.
4-8. General
Each malfunction stated is followed by a list of probable
This section provides information useful for
causes of the trouble.
The corrective action
organizational maintenance in diagnosing and correcting
recommended is described opposite the probable cause.
unsatisfactory operation or failure of the earth auger.
4-5