TM 5-3820-239-15
Possible remedy
Probable cause
5-6. Drill Steel does not Rotate
Disassemble and inspect
Pump vanes damaged or
Possible remedy
Probable cause
hydraulic pump and
loose.
air motor for damaged
Disassemble drill and
Rifle bar, pawls, rifle
inspect parts for damage.
nut, or chuck nut
Disassemble and reverse-
Clean and lubricate
Pump rotating in wrong
damaged or worn.
direction.
parts before assembling
Improper lubrication ------Readjust manifold lubrica-
5-9. Hydraulic Valve Operating
tor if required. Check
oil level in lubricating
Improperly
oil reservoir.
Probable cause
Possible remedy
Excessive leakage --------Check hoses and fittings.
5-7. Air Feed Motor Operates with low
Check condition of
Power
O-rings in valve.
Possible remedy
Probable cause
Disassemble and inspect
Control level linkage
parts for damage (para
Worn bearings ------------Disassemble and inspect
parts damaged.
6-24).
Disassemble and inspect
Relief valve clogged
10c). Replace if re-
causing erratic pressure. relief valve parts (para
quired.
6-24). Check that shim
Disassemble and inspect
thickness is proper for
liners worn or scored.
for worn and scored
2000 psi system pressure
relief.
Replace if required.
Rotary valve loose in
Check suction oil filter,
Hydraulic oil flow re-
Inspect and replace rotary
rotary valve bushing.
return lint oil filter,
stricted.
valve if required.
and all hoses and fit-
tings for dirt and clog-
5-8. Hydraulic Pump Operating
Improperly
Probable cause
Possible remedy
5-10. Hydraulic Cylinders
Operating
Air supply insufficient ---Check hoses and fittings
Improperly
for leakage.
Possible remedy
Probable cause
Check suction oil filter,
Hydraulic oil flow re-
Disassemble suspected
Excessive oil leakage at
return line oil filter
stricted.
cylinder and inspect
gland nut.
and reservoir for dirt
packings. Replace if
Flexible coupling loose ----.Disassemble and inspect
6-59, and 6-66).
for loose or damaged
Oil leakage at check valves Disassemble and inspect
at cylinders.
for damaged parts.
Improper lubrication ------Check oil level in lubri-
Replace as necessary
cating oil reservoir or
adjust metering valve
6-66).
if required.
Section III. REMOVAL AND INSTALLATION OF MAJOR
COMPONENTS AND AUXILIARY ITEMS
5-12. Complete Drill Mounting
a. Removal of major components not cov-
a. Removal.
(1) Disconnect the manifold lubricator
ered in this section are provided in Chapter 3.
The remainder of the assemblies are covered in
air line connection to the complete
Chapter 6.
nuts (2), and lock washers (3), se-
connections to be removed and connected for
curing drill guide mounting plate
the following assemblies.