TM 5-2420-231-23-1
0070
Table 1. Return-to-Dig Function Fails to Operate or Operates Improperly.
0070
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test Step 1. Verify Operation of
Return-to-Dig Function Fails
Loader Lift, Clamshell, and Bucket.
to Operate or Operates
Improperly
1. Operate loader lift (TM 5-2420-
Lift Operates Correctly - Proceed to
231-10). Monitor and record
step 2.
machine operation.
Lift Does Not Operate Correctly -
Diagnose and repair lift malfunction
Proceed to Test Step 9.
2. Operate clamshell (TM 5-2420-
Clamshell Operates Correctly -
231-10). Monitor and record
Proceed to step 3.
machine operation.
Clamshell Does Not Operate
Correctly - Diagnose and repair
clamshell malfunction (WP 0066).
Proceed to Test Step 9.
3. Operate bucket (TM 5-2420-231-
Bucket Operates Correctly - Proceed
10). Monitor and record machine
to step 4.
operation.
Bucket Does Not Operate Correctly -
Diagnose and repair bucket malfunction
Proceed to Test Step 9.
4. Operate load leveler function (TM
Load Leveler Operates Correctly -
5-2420-231-10). Monitor and
Proceed to Test Step 2.
record machine operation.
Load Leveler Does Not Operate
Correctly - Diagnose and repair load
leveler malfunction (WP 0068).
Proceed to Test Step 9.
Test Step 2. Inspect Return-to-Dig
Limit Switch and Hardware.
1. Lower bucket to ground and turn
ignition switch to off position (TM
5-2420-231-10).
2. Inspect rod and clevis (Figure 1,
Rod and Clevis OK - Proceed to step 3.
Item 5) for corrosion and damage.
Rod or Clevis Corroded or Damaged
- Replace rod and clevis (WP 0278).
Adjust return-to-dig limit switch (WP
0278).
Proceed to Test Step 9.
3. Inspect cam and clevis (Figure 1,
Cam and Clevis OK - Proceed to step
Item 4) for corrosion and damage.
4.
Cam or Clevis Corroded or Damaged
- Replace cam and clevis (WP 0278).
Adjust return-to-dig limit switch (WP
0278).
Proceed to Test Step 9.
NOTE
Roller on return-to-dig limit switch lever should be in contact with cam.
