TM-9-2320-304-14-P

LOAD HANDLING SYSTEM, HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, AND DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)

AUGUST 2000

TM-9-2320-304-14-P - Page 387 of 1320

TM 9-2320-304-14&P

4-9

Section V. Troubleshooting

4-17. LOAD HANDLING SYSTEM (LHS) TROUBLESHOOTING.

This section covers Load Handling System (LHS) Troubleshooting. The LHS Fault Index,

Table 4-2

, lists faults

for the LHS of the M1120 truck. The LHS-CHU Fault Index,

Table 4-2.1

, lists faults for the LHS-CHU on the

M1120 truck.

4-18. TROUBLESHOOTING INSTRUCTIONS.

a. Measurements Required for Troubleshooting.

CAUTION

Use properly sized test leads and ensure care is used when checking for resistance,

continuity, or voltage at connectors, or damage to equipment may result.

(1)

Resistance measurements.

(a)

Connect red test lead to Volt-Ohm input connector and black lead to COM input connector

on meter.

(b)

Set the function/range switch to the desired Ohm position. If the magnitude of the

resistance is not known, set the switch to the highest range, then reduce until a

satisfactory reading is obtained.

(c)

If the resistance being measured is connected to a circuit, turn ENGINE switch to OFF

position.

(d)

Connect test leads to the circuit being measured. When measuring high resistance, be

careful not to contact adjacent points, even if they are insulated. Some insulators have a

relatively low insulation resistance which can affect the resulting measurement.

(e)

Read the resistance value on the digital display.

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