MALFUNCTION
TEST
CORRECTIVE ACTION
3. TRAMMING MOTOR OPERATES UNEVEN OR SLUGGISH
Step 1.
Check tramming motor brake adjustment.
Adjust tramming motor brake (para 3-9).
Step 2.
Check for improper track tension.
Adjust track tension (para 3-27).
Step 3.
Check to make sure transmission is fully engaged.
Check clutch handle position for proper engagement (para 2-3).
4. DRILL ENGINE IS SLUGGISH OR OPERATES ERRATICALLY
Step 1.
Check for incorrect grade of oil.
Refer to LO .5-3820-241-12 and service reservoir with proper grade of oil.
Step 2.
Check for inadequate main air supply.
Build up air supply to 110 to 120 p.s.i.
Step 3. Check for lack of oil in rock drill engine.
Service the lubricator fitting (para 3-20) or adjust fitting (para 3-20).
5. DRILL ENGINE LACKS POWER
Step 1. Check for plugged air strainer in lubricator.
Service the air line lubricator, or adjust the lubricator (para 3-20).
Step 2. Check for restricted air line.
Remove restriction or notify organizational maintenance.
Step 3. Check for inadequate air supply.
Build up air supply to 110 to 120 p.s.i.
Step 4. Check for lack of oil at rock drill engine.
Adjust the lubricator fitting (para 3-7).
6. DRILL ENGINE DRILLING SPEED IS LOW
Step 1. Check for accumulation of excessive rock and dust in drill hole.
Adjust blow control valve (para 2-3).
Step 2. Check for plugged bit or drill steel.
Clean out passage in drill steel and bit.
7. ICE OR FROST ON EXHAUST PORT
Step 1. Check for rapid feed advance.
Advance feed slower (para 2-3).
Step 2. Check for excessive moisture in air supply.
Blow out main air supply line and drain off excess water.
8. DRILL ENGINE OVERHEATS.
Step 1. Check for proper lubricator fitting adjustment.
Adjust lubricator fitting (para 3-20).
Step 2. Check for proper type drill oil.
Refer to LO 53820-241-12 and service oil reservoir.
Step 3. Check for clogged hydraulic oil filter.
Service the hydraulic oil filter (para 3-17).
Step 4. Check for insufficient feed pressure.
Adjust bulkhead metering valve (para 3-19).
9. DRILL STEEL STICKS IN HOLE.
Step 1. Check for worn or dull bit.
Sharpen or replace bit para 2-3).
Step 2. Check for improper drilling procedure.
Review drilling procedure (para 2-3).
Section IV. MAINTENANCE OF THE FINAL DRIVE
3-7. General
This section contains operator/crew instructions for
inspection and adjustment of the final drive (transmission
and tramming motors).
3-8. Final Drive Inspection
Inspect the transmission and tramming motors for loose
plugs and bolts. Inspect all surfaces for oil leaks. Check
air hoses for sharp bends, cracks or ruptures. Tighten
all loose plugs, bolts and hose clamps. Refer defective
or damaged hoses to organizational maintenance.
3-9. Transmission Tramming Brake
a. General. Each of the two tramming
transmissions is equipped with a brake. If improperly
adjusted, the brake can cause slow or uneven tramming
and will result in a loss of tramming power. The
tramming brake adjustments are located at the top rear
of each transmission.
b. Brake Adjustment. Adjust the transmission
tramming brake as illustrated in figure 3-1.
3-3
