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 365 of 1417

Table
1.
Field Preventive Maintenance Checks and Services - Continued.
ITEM
NO.
INTERVAL
ITEM TO BE
CHECKED OR
SERVICED
PROCEDURE
EQUIPMENT
NOT READY/
AVAILABLE IF:
27
Semiannual
Fuel System
Engine
NOTE
Steps (a) and (b) apply to M939A1
series vehicles and Step (e) applies
to M939A2 series vehicles. All other
steps are common to both vehicles.
Replace fuel filter every 3,000 mi
(4,800
km) or 3 months, whichever
occurs first.
a.
Replace filter in standard AFC fuel pump on all
M939/A1 series vehicles except M936/A1 models
(WP
0259) or in VS fuel pump on M936/A1 models
(WP
0260).
b.
Inspect fuel filter/water separator mounting and
housing for dents and cracks, and damage to inlet,
outlet, and bleeder fittings that could cause leaks
(Volume 5, WP
0819).
c.
Install fuel filter element on M939/A1 series
vehicles, or fuel filter on M939A2 series vehicles
(WP
0258).
d.
Inspect fuel lines for tightness of connections
(WP
0254).
e.
Check fuel system components of M939A2
series vehicles.
(1)
Inspect fuel injector lines, injector pump lines,
and manifold line and screws for leaks and damage.
Tighten fuel injector lines, injector pump lines, and
manifold pine and screws if leaking and replace if
damaged (WP
0244).
(2)
Inspect injector line holddown screws for
security of mounting. If loose, tighten (WP
0244).
(3)
Replace in-line fuel filter (WP
0258).
f.
Check fuel priming pump on M939/A1 series
vehicles or fuel priming transfer pump on M939A2 series
vehicles for security of mounting and proper operation.
g.
Lubricate throttle control and modulator linkages.
28
Semiannual
Protective
Control Box
Inspect control box and quick-disconnect for security of
mounting and connection. Tighten control box mounting
screws and/or quick-disconnect, if
loose (WP
0319).
29
Semiannual
Engine
Compartment
Electrical Wiring
Inspect all engine compartment wiring for frays, splits,
missing or damaged insulation, or poor connections.
Repair or replace affected wiring (Volume 3, WP
0352).
TM 9-2320-272-23-2
0207
0207-30


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