TRUCK SERVICE MANUAL
TRANSMISSION
HT 700D SERIES TRANSMI SSIONS
Para 3-4/3-7
(4) Check the oil level on the dipstick at least
3-5. OIL SPECIFICATIONS
twice. It should register at the Full mark each time.
Inconsistency in registration may be due to pressure
a. Dexron is the only fluid recommended for the
buildup in the transmission.
Improper venting to
HT 700D series transmission. Type C2 and Type A
atmosphere of the breather (para 3-9) may be a frequent
fluids may be used to fill the transmission or intermixed
cause of this problem.
with Dexron, but only in an emergency, when Dexron is
not available.
CAUTION
The oil level rises as sump temperature
When the ambient
b. Ambient Temperatures.
increases. Therefore, do not fill above
temperature is below -300F (-340C), an auxiliary preheat
the Add mark before the transmission
is required. Raise the sump temperature to above -300F
has
reached
normal
operating
(-340C) before operating the transmission.
temperature.
3-6. OIL AND OIL FILTER CHANGE INTERVALS
e. Safe Level. The safe operating level is from the
Add mark to the Full mark on the dipstick. Do not
Oil and oil filter change frequency is determined by
operate the vehicle when the oil level is higher or lower
the transmission application and by the filter equipment
than the Full-Add range.
installed. The following table is a general guide. More
frequent changes may be required when operations are
3-4. KEEP OIL CLEAN
subject to high levels of contamination.
Oil must be handled in clean containers, fillers, etc,
3-7. OIL AND OIL FILTER CHANGE PROCEDURES
to prevent foreign material entering the transmission.
a. The transmission should be at operating
CAUTION
temperature (160-2000F) (71-930C) when the oil is
Containers or fillers that have been used
drained. This will insure quicker and better drainage.
for any antifreeze solution must not be
used for oil that is to be used in the
b. On earlier models, remove the fill tube from the
transmission.
oil pan and allow the oil to drain. On later models
remove the drain plug from the rear of the oil pan and
Clean around oil filler tube before removing dipstick, and
allow the oil to drain. Check the condition of the oil as
lay dipstick in a c 1 e a n place while filling the
described in paragraph 3-8. Suction Screen in Oil Pan
transmission. Check the current issue of the HT 700
Series Parts Catalog (SA 1268) for proper replacement
oil filter. Keep filters in cartons until ready for installation.
OIL AND OIL FILTER CHANGE INTERVALS
Oil Change
Suction Screen in Oil Pan
External
When equipped
When not equipped
Oil Filter
with external filter
with external filter
Element
Coaches
100, 000 miles
At first oil change
After first 5, 000 miles
or 12 months
and each 500, 000
At each oil change
and each 50, 000
miles
miles or overhaul
Trucks
50, 000 miles or
At first oil change
After first 5, 000 miles
(on-highway)
12 months
and each 500, 000
At each oil change
and each 50, 000
miles thereafter
thereafter
miles or overhaul
Trucks
25, 000 miles, 800
At first oil change
After first 5, 000 miles
(off-highway)
hours or 6 months
and each 500, 000
At each oil change
and each 25,
000
thereafter
miles thereafter
miles or overhaul
700
