TM 10-4320-344-24
Table 2-4.
Unit Troubleshooting Table.
(Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE WILL NOT CRANK. (Continued)
Step 3.
a.
b.
Step 4.
a.
b.
c .
Step 5.
Inspect wiring harness for corroded, dirty, or loose connections, and
broken, frayed, or damaged wires.
Clean and tighten all connections.
Refer to paragraph 2.17.1 and repair or replace wiring harness as
necessary.
Check blower V-belt contact switch.
(Models 609-C and US636HCCD-1)
Ensure V-belt contact switch is not in contact with idler pulley.
Test V-belt contact switch (paragraph 2.21.19).
Replace defective V-belt contact switch (paragraph 2.21.19).
Test battery.
Recharge (TM 9-6140-200-14) or replace battery (paragraph 2.15.2, 2.15.3, or
2 .1 5 . 4 ).
Step 6.
Check voltage on voltmeter.
If voltage is less than 12 vdc (Models 609-A and US636HCCD-1) or 24 vdc
(Model 609-C), replace alternator (paragraph 2.21.16).
Step 7.
a .
b .
Step 8.
Set engine switch in run mode.
Disconnect switch.
Using multimeter,
set to 200 ohm scale, check engine switch for continuity.
(Model 609-A)
If reading is 1 ohm or less, go to step 13.
If reading is more than 1 ohm, refer to paragraph 2.16.18 and replace
engine switch.
Test main power switch for open.
(Model 609-C).
Replace main power switch (paragraph 2.16.18).
Step 9.
Test start/run switch for open.
(Model 609-C)
Replace start/run switch (paragraph 2.16.18).
Step 10.
Test start switch (paragraph 2.16.19).
(Model US636HCCD-1)
Replace start switch (paragraph 2.16.19).
Step 11.
Test start/stop switch (paragraph 2.16.20).
(Model US636HCCD-1)
Replace start/stop switch (paragraph 2.16.20).
Step 12.
a .
b.
Disconnect solenoid.
Using multimeter, set to 200 ohm scale, check the
starter relay coil at the solenoid connection.
(Model 609-A)
If the reading is 15 ohms or less, go to step 14.
If reading is more than 15 ohms, notify direct support maintenance.
2-30
