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 709 of 894
TRUCK SERVICE MANUAL
HT 700D SERIES TRANSM I S IONS
Para 3-9/3-11
3-9.
BREATHER
The breather is located at the top of the transmission
housing as shown in figure 3-1 The breather serves to
prevent pressure buildup within the transmission.
The
breather must be kept clean and the passage open.
The
prevalence of dust and dirt will determine the frequency
at which the breather requires cleaning.
Always use a
wrench of the proper size to remove or replace the
breather.
Pliers or a pipe wrench will crush or damage
the stem and produce metal chips which could enter the
transmission.
3-10.
LINKAGE
a. Maintain Proper Adjustment.
Proper adjustment
of the manual selector valve linkage is important as the
shift tower detents must correspond exactly to those in
the transmission.
Periodic inspections should be made
for bent or worn parts, loose threaded connections, loose
bolts, and accumulation of grease and dirt.
All moving
joints must be kept clean and well lubricated.
b. Reference to Vehicle Manual.
Refer to vehicle
manual for specific linkage adjustment procedures.
The
following general procedures are applicable to most
vehicles.
(1)
The manual selector lever should move
easily and give a crisp detent feel in each position.
The
linkage should be adjusted so that the stops in the shift
tower match the detents in the transmission.
(2)
When the linkage is correctly adjusted, the
pin which engages the shift lever linkage at the
transmission can be moved freely in each range.
CAUTION
Proper installation of the external
selector lever is imperative to the
function of the transmission.
Excessive
torque applied to the external selector
lever retaining nut may damage the
internal selector lever.
(3)
To properly install t h e external lever
proceed as follows.
Rotate the manual selector shaft to
a position that is two detent notches from either end of its
travel.
Install
the external lever so that the flat sides of the shaft
opening are parallel to the flats on the shaft.
Install the
nut.
While holding the lever against rotation, tighten the
nut to 15 to 20 pound feet (21 to 27 Nm) torque.
(4)
Clean and lubricate all hydraulic retarder
valve linkage.
The retarder is applied when the valve
moves upward (out of the valve body).
Therefore, it is
important for normal operation with retarder Off, that the
linkage be adjusted so the valve returns to the retracted
position.
If the linkage causes the retarder to be partially
applied, loss of lubrication pressure, overheating, or
excessive drag will result and fuel consumption will be
excessive.
If the valve does not have full travel (1.5 in.
[38.1 mm]), maximum
performance of the retarder
cannot be obtained.
(5)
Inspect the linkage for binding, wear,
cracks, breaks and defective cotter pins.
Replace all
defective parts.
3-11.
SHIFT SPEED ADJUSTMENTS
NOTE
Transmission shift points cannot be
satisfactorily adjusted if the transmission
has the wrong governor installed.
Check the two-digit code on the head of
the governor with the code shown in the
current parts catalog (SA 1268) for the
governor listed for your
trans-mission
assembly part number.
If the letter "M"
follows the two-digit code, the governor
is a service replacement assembly.
If
the "M" is not included, the governor was
installed at original factory build.
a. Calibrated On Test Stand Or In Vehicle
(1)
Proper timing of shift speed points is
necessary for maximum transmission performance.
Shifts may be adjusted on the test stand when the
transmission is rebuilt or overhauled, or during road
testing of the vehicle.
(2)
Test stand equipment
differs among
rebuild or overhaul facilities.
Some shops may have
equipment to drive and load the transmission, with
instrumentation for
702
TRANSMISSION
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