TM 5-2420-231-23-1
0070
Table 1. Return-to-Dig Function Fails to Operate or Operates Improperly - Continued.
070
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test Step 6. Test Ground Circuit for
Return-to-Dig Function Fails
High Resistance or Open.
to Operate or Operates
Improperly - Continued
1. Ensure ignition switch is in the off
position (TM 5-2420-231-10).
2. Remove two bolts (Figure 2, Item
3), four washers (Figure 2, Item 2),
and bracket (Figure 2, Item 4) from
arm assembly (Figure 2, Item 1).
3. Using digital multimeter, measure
Resistance 5.0 Ohms or Less -
resistance between front main
Proceed to step 4.
chassis wiring harness connector
Resistance Greater Than 5.0 Ohms -
terminal 1 (WP 0007, Figure 226)
Replace main chassis wiring harness
and return-to-dig switch NC termi-
(WP 0154).
nal (WP 0007, Figure 225). Resis-
Install and adjust return-to-dig limit
tance should be 5.0 ohms or less.
switch (WP 0278).
Proceed to Test Step 9.
4. Using digital multimeter, measure
Resistance 5.0 Ohms or Less -
resistance between return-to-dig
Replace and adjust return-to-dig limit
switch COM terminal (WP 0007,
switch (WP 0278).
Figure 225) and ground. Resis-
Proceed to Test Step 9.
tance should be 5.0 ohms or less.
Resistance Greater Than 5.0 Ohms -
Replace main chassis wiring harness
(WP 0154).
Install and adjust return-to-dig limit
switch (WP 0278).
Proceed to Test Step 9.
0070-6