TM-9-2320-272-23-1

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-1 - Page 342 of 1313

FIELD MAINTENANCE

POOR ACCELERATION AND/OR LACK OF POWER

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Personnel Required

(2)

References

Point to Point Schematics

TM 9-2320-272-10

Volume 2, WP

0243

Volume 2, WP

0244

Volume 2, WP

0249

Volume 2, WP

0254

Volume 2, WP

0258

Volume 2, WP

0259

References (cont.)

Volume 2, WP

0260

Volume 2, WP

0268

Volume 2, WP

0269

Volume 2, WP

0273

Volume 2, WP

0274

Volume 2, WP

0275

Volume 2, WP

0276

Volume 2, WP

0299

Volume 2, WP

0305

Volume 3, WP

0365

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

POOR ACCELERATION AND/OR LACK OF POWER

NOTE

Conduct this malfunction test if there is poor acceleration or lack of power. This procedure

will check for air intake stack or air cleaner element clogged, fuel pump filter clogged or dirty,

fuel filter leaking or damaged, fuel supply line faulty, fuel supply line connections loose,

exhaust system faulty, throttle level travel out of adjustment , air fuel control (AFC) tube faulty,

exhaust leaks, fuel transfer pump faulty, fuel injector supply line clogged, fuel filter clogged

and/or dirty, and turbocharger faulty.

TM 9-2320-272-23-1

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