TM 5-3820-241-34
Table 2-1. Troubleshooting-continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13 LIFT INOPERATIVE OR ERRATIC
Step 1. Check for defective control valve.
Repair or replace hydraulic control valve (para 3-22, 3-24).
Step 2. Check for defective hydraulic pump.
Repair or replace hydraulic pump (para 3-18, 3-20).
Step 3. Check for defective motor.
Repair or replace air motor (para 4-2, 4-4).
Step 4 Check for defective swing cylinder.
Repair or replace swing cylinder (para 3-8, 3-10).
14 DRIFTER DRILL FAILS TO TRAVEL ON CARRIAGE OR TRAVELS TO SLOW
Step 1. Check for defective feed motor.
Repair or replace feed motor (para 5-10, 5-12).
Step 2 Check for defective drill motor.
Repair or replace feed motor (para 5-10, 5-12).
Step 3. Check for defective feed control valve.
Repair or replace feed control valve (para 5-14, 5-16).
Step 4. Check for defective feed transmission.
2-2
Repair or replace feed transmission (para 5-6, 5-8).
Step 3. Check for defective tramming motors.
Repair or replace tramming motor (para 6-2, 6-4).
5 AIR MOTOR INOPERATIVE OR OPERATES TOO SLOW
Step 1. Check for defective air pressure regulator.
Kepair air pressure regulator (para 4-6, 4-8).
Step 2. Check tor defective air motor.
Repair or replace air motor (para 4-2, 4-4).
6 HYDRAULIC SYSTEM INOPERATIVE OR OPERATES ERRATICALLY
Step 1. Check for defective control valve.
Kepair or replace control valve (para 5-14, 5-16).
Step 2. Check for defective hydraulic pump.
Step 3. Check for defective air motor.
Check for defective hydraulic pump.
7 FEED EXTENSION CYLINER WILL NOT OPERATE
Step 1. Check for defective feed control valve.
Repair or replace feed control valve (para 5-14, 5-16).
Step 2. Check tor defective feed extension cylinder (para 3-14, 3-16).
Repair or replace feed lift (para 3-14. 3-16).
8 BOOM LIFT CYLINDER WILL NOT OPERATE
Step 1. Check for defective boom lift control valve.
Repair or replace hoom lift control valve (para 5-14, 5-16).
Step 2. Check for defective boom lift cylinder.
Repair or replace boom lift cylinder (para 3-5, 3-7).
9 FEED SWING CYLINDER WILL NOT OPERATE
Step 1
Check for defective feed swing control valve.
Repair or replace feed swing control valve (para 5-14, 5-16).
Step 2 Check for defective feed swing cylinder.
Repair or replace feed swing cylinder (para 3-8, 3-10).
10 BOOM SWING CYLINDER WILL NOT OPERATE
Step 1. Check for defective boom swing control valve.
Repair or replace boom swing control valve (para 5-14, 5-16).
Step 2. Check for defective boom swing cylinder.
Repair or replace boom swing cylinder (para 3-11, 3,13).
11 FEED EXTENSION CYLINDER WILL NOT OPERATE
Step 1. Check for defective feed extension control valve.
Repair or replace feed extension control valve para (5-14, 5-16).
Step 2. Check for defective feed extension cylinder.
Repair or replace feed extension cylinder (para 3-14, 3-16).
12 TILT OR SWING ACTION IS INOPERATIVE
Step 1.
Check for defective tilt or swing control valve.
Repair or replace control valve (para 5-14, 5-16).
Step 2
Check for defective air motor.
Repair or replace air motor (para 4-2, 4-4).
Step 3. Check for defective hydraulic pump.
Repair or replace hydraulic pump (para 3-18, 3-20).
Step 4.
Check for defective tilt or swing cylinder.
Repair or replace tilt cylinder (para 3-2, 3-4), feed swing cylinder (para 3-8, 3-10), or boom swing cylinder.
(para 3-11, 3-13).
