TM 5-3820-239-15
Section V. TBOUBLESHOOTING
Possible remedy
Probable cause
3-15. General
Grease channels on drill
Drill sticking when
guide.
moving up and down
This Section provides information useful in
drill guide.
diagnosing and correcting unsatisfactory oper-
ation or failure of the pneumatic drill. Each
3-18. Hydraulic Valve Operating
trouble symptom stated is followed by a list
of probable causes. The possible remedy rec-
Improperly
ommended is described opposite the probable
Possible remedy
Probable cause
cause. Any trouble beyond the scope of organi-
Excessive leakage around Tighten hoses. Disassem-
zational maintenance shall be reported to di-
ble and inspect for
boss fittings.
rect support maintenance.
damaged O-rings (re-
port this condition to
direct support mainte-
3-16. No Hydraulic Pressure in System
nance).
Possible remedy
Probable cause
Inspect return line filter.
Fluttering action due to
Check hoses and fittings
Insufficient air supply
Replace cartridge if
plugged return line.
to hydraulic pump air
for leakage.
necessary. Drain and
motor.
flush hydraulic reser-
Throttle valve closed_ _ _ _ _ _Open throttle valve.
voir if necessary.
Hydraulic pump coupling Inspect and tighten or
Disassemble and inspect
replace.
loose or damaged.
spools, springs and
smoothly.
Replace pump or air
Hydraulic pump or air
handles (report this
motor (para. 3-43).
motor damaged.
condition to direct
Hydraulic lines clogged_ _ _ _ _Check suction filter and
support maintenance).
hydraulic reservoir for
dirt and sludge. Drain,
Erratic system pressure_ _ _ _ _ Clean relief valve in hy-
flush and refill if neces-
draulic valve (report
this condition to direct
sary (para. 3-23).
Hydraulic oil level low_ _ _ _ _ _Check hydraulic reservoir
support maintenance).
(para. 3-12) and fill
if necessary. Inspect for
leaks.
3-19. Boom Operates Improperly
Probable Cause
Possible remedy
3-17. Drifter Drill Inoperative
Oil leakage in hydraulic Replace cylinder (para
Possible remedy
Probable cause
cylinders.
Check hoses and fittings
Air feed motor connec-
Excessive clearance be-
Replace rod Packing (re-
for leakage.
tions loose or damaged.
port this condition to
tween cylinder head
Air feed motor not being Check level in lubricating
direct support mainten-
and rod.
oil reservoir. Refill if
properly lubricated.
ance).
required (para. 3-9).
Boom drifts due to cyl-
Replace cylinder (para.
Inspect, clean, and lubri-
Feed chain broken or
3-46).
inder leakage.
cate feed chain (para.
damaged.
3-27).
Air feed motor damaged _ _ _ _ Disassemble and inspect
3-20. Traction Unit Brakes Improperly
(report this condition
Possible remedy
Probable cause
to direct support main-
Brakes need adjustment_ _ _ _ _Adjust brakes (para. 3-
tenance).
38).
Disassemble and inspec
Remote control mani-
Inspect hoses for condi-
Air hoses to brakes im-
(report this condition
fold damaged.
tion and proper con-
to direct support main-
properly connected
tenance).
or damaged.
Brakes damaged_ _ _ _ _ _ _ _ _Disassemble and inspect
Disassemble and inspect
Drifter drill binding or
(report this condition
(report this condition
damaged.
to direct support
to direct support main-
maintenance).
tenance).
3-12