TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 334 of 1417
FIELD MAINTENANCE
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) INTRODUCTION
INTRODUCTION
The best way to maintain vehicles covered by this manual is to inspect them on a regular basis so minor faults can
be discovered and corrected before they result in serious damage, failure of vehicle and equipment, or injury to
personnel. This section contains systematic instructions for inspection, adjustment, and correction of vehicle
components to avoid costly repairs or major breakdowns. This is referred to as Preventive Maintenance Checks and
Services (PMCS).
INTERVALS
NOTE
Designated intervals are performed under usual operating conditions. PMCS must be
performed more frequently when operating under unusual conditions.
Field Maintenance, assisted by operator/crew, will perform the PMCS at the following intervals:
Semiannual.
Every 6 months or 6,000 miles (9,656 kilometers), whichever occurs first.
Annual.
Every 12 months or 12,000 miles (19,312 kilometers), whichever occurs first.
Biennial.
Every 24 months or 24,000 miles (38,624 kilometers), whichever occurs first.
Perform all semiannual inspections in addition to annual inspections at the time of the annual inspection. Perform
all annual and semiannual inspections in addition to biennial inspections at the time of the biennial inspection.
REPORTING REPAIRS
All uncorrected defects will be recorded on Equipment Inspection and Maintenance Worksheet, DA Form 2404, in
accordance with DA Pam 738-750.
GENERAL SERVICE AND INSPECTION PROCEDURES
While performing specific PMCS procedures, ensure items are correctly assembled, secure, serviceable, not worn,
not leaking, and adequately lubricated as defined below:
• An item is CORRECTLY ASSEMBLED when all parts are present and in proper position.
• When wires, nuts, washers, hoses, or attaching hardware cannot be moved by hand, wrench, or prybar,
they are secure.
• An item is UNSERVICEABLE if it is worn beyond established wear limits or is likely to fail before the next
scheduled inspection.
• An item is WORN if there is play between joining parts, or warning and caution plates are not readable.
• If an item meets the requirements specified by lubrication instructions, (Volume 5, WP
0820), then it is
ADEQUATELY
LUBRICATED.
Where the instruction "tighten" appears in a procedure, you must tighten with a wrench to the given torque value
even when the item appears to be secure.
Where the instruction "clean" appears in a procedure, refer to the
General Maintenance instructions (Volume 5, WP
0819).
TM 9-2320-272-23-2
0206
0206-1
Back to Top
