TM 5-3820-241-34
CHAPTER 2
DIRECT SUPPORT AND GENERAL SUPPORT
MAINTENANCE INSTRUCTIONS
Section I. REPAIR PARTS, SPECIAL TOOLS AND EQUIPMENT
for performing maintenance on the pneumatic
2-1. Tools and Equipment
rock drill.
Tools and equipment and repair parts issued
with, or authorized for the pneumatic rock drill
2-3. Maintenance Repair Parts
are listed in TM 5-3820-241-34P.
Repair parts and equipment authorized for direct
2-2. Special Tools and Equipment
and general support maintenance is listed in TM
5-3820-241-34P.
No special tools and equipment are required by
direct and general support maintenance personnel
Section II. TROUBLESHOOTING
2-4. Introductory Information
actions to take. You should perform the tests,
inspections and corrective actions in the order
This section contains troubleshooting information
listed.
for locating and correcting most of the operating
troubles which may develop during operation of
2-5. Troubleshooting Table
the pneumatic rock drill. Each malfunction for an
Table 2-1 lists the direct and general support
individual component, unit or system is followed
maintenance troubleshooting malfunctions, tests,
by a list of tests or inspections which will help you
inspections and corrective actions.
t o determine probable causes and corrective
Table 2-1 Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1 DRILL MOTOR IS INOPERATIVE
Step 1. Check for gummed oil or dirt in motor operating parts.
Disassemble and clean drill motor (para 5-10, 5-12).
Step 2. Check for defective feed control valve.
Replace feed control (para 5-13, 5-16).
Step 3. Check for defective drill motor repair or replace drill motor (para 5-9, 5-12).
2 DRILL OPERATES SLUGGISHLY OR ERRATICALLY
Step 1. Check for gummed oil or dirt in drill operating parts.
Disassemble and clean drill motor (para 5,-10, 5-12).
Step 2. Check for defective feed control valve.
Repair or replace feed control valve (para 5-14, 5-16).
3 DRIFTER DRILL FAILS TO TRAVEL ON CARRIAGE OR TRAVELS TOO SLOW
Step 1. Check for defective feed control valve.
Replace feed control valve (para 5-14, 5-15).
Step 2. Check for defective feed transmission.
Repair or replace feed transmission (para 5-6, 5-8).
Step 3. Check for defective feed motor.
Repair or replace feed motor (para 5-2, 5-4).
4 TRAMMING MOTORS FAIL TO TRAM ROCK DRILL OR TRAM TOO SLOW
Step 1. Check for defective tramming throttle valve.
Repair or replace throttle valve (para 4-10, 4-12).
Step 2. Check for defective tramming motor final drive.
Repair or replace final drive (para 6-6, 6-8).
