TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 713 of 894
TRUCK SERVICE MANUAL
TRANSMISSION
HT 700D SERIES TRANSMISSIONS
Para 3-13/3-14
event of brake failure or inadequate blocking. Do not
maintain the stalled condition longer than 30 seconds
due to rapid heating of the transmission oil. With the
transmission in neutral, run the engine at 1200 to 1500
rpm for 2 minutes to cool the oil between tests. Do not
allow the converter-out temperature to exceed 3000F
(1490C). Keep close check to prevent the engine cooling
system from overheating.
b
.
Procedure
CAUTION
Do not attempt to stall test the transmission in reverse.
The extremely high torque produced may damage the
transmission and/or the vehicle drive line.
(1
)
Connect a tachometer of known accuracy to the
engine. Stall torque converter by locking the transmission
output (putting the transmission in gear) and accelerating
the engine to full throttle. Note the maximum rpm the
engine will attain. The speed attained is then compared
to the speed specified, by the vehicle manufacturer as
normal for those conditions. This information (stall
speed) may be obtained from your equipment dealer or
distributor. An engine speed above or below the specified
range may indicate a malfunction in the engine or
transmission.
NOTE
Engine power will decrease with an increase in elevation
(altitude), the decrease becoming more pronounced at
greater elevation. This will result in a lower engine speed
under converter-stall conditions.
(2
)
After making allowances for elevation, a low
engine speed may indicate the engine is not delivering
full power. Refer to the engine service manual for engine
repair information.
(3
)
If low engine speed persists after the engine is
tuned, refer to the troubleshooting procedures and chart
in paragraph 3-19 below.
(4
)
If high engine speed is noted, refer to the
troubleshooting chart in paragraph 3-19.
3-14. PRESERVATION AND STORAGE
a
.
Preservative
Method
Selection.
When
transmissions are to be stored or remain inactive for
extended periods of time, specific preservative methods
a re recommended to prevent rust and corrosion
damage. The length of storage will usually determine the
preservative method to be used. Various methods are
described below.
b
.
Storage,
New
Units.
New
units
contain
preservative oil when shipped, and can be safely stored
for 6 weeks without further treatment.
c
.
Storage, Month to 6 Weeks
(1
)
The
following
procedures will prepare a
transmission for a month to 6 weeks storage, depending
on the environment.
(2
)
Drain the oil as described in paragraph 3-7. Re
move the transmission oil filter(s).
(3
)
Install the new filter(s), gasket, oil pan, and fill
tube.
(4
)
Fill the unit to operating level with
any
commercial preservative oil which meets US Military
specifications
MIL-L-21260,
Grade
1,
to
latest
specifications.
(5
)
Operate the unit for at least 5 minutes in neutral
at 1500 rpm.
Shift the transmission slowly through all
selector positions to thoroughly distribute the oil. Then,
shift to a forward range and stall the transmission output
until an oil temperature of 225°F (1070C) is obtained.
CAUTION
Do not allow temperature to exceed 225°F (1070C).
(6
)
Stop the engine. As soon as the unit is
cool enough to touch, seal all opening sand breather with
moisture-proof tape.
706
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