TRUCK SERVICE MANUAL
HT 700D SERIES TRI
(7) Wash off all the external grease with
AND DURING OPERATION
(8) Drain oil as described in paragraph 3-7,
a. Determine Trouble Cause. If inspection (para 3-
16a, above) does not reveal the cause of trouble, and the
(9) Install a new oil filter(s).
vehicle is operational, further troubleshooting is
(10) Refill transmission with Dexron automatic
necessary. Do not remove the transmission from the
transmission fluid to proper level.
vehicle until the causes of trouble are checked against
the troubleshooting chart (para 3-19, below).
3-15. CHECKING OIL PRESSURES
Oil pressures may be checked during operation
b. Properly Tuned Engine. To make a thorough test
of the transmission to assist in the location of
malfunctions. P r e s s u r e check points are shown in
of the vehicle-mounted transmission, be sure that the
engine is properly tuned and that the oil level in the
figure 3-1. Make pressure tests in conjunction with
transmission is correct. (Refer to para 3-3 for checking oil
troubleshooting procedures outlined in paragraphs 3-16
through 3-18. Refer to paragraph 1-16.
3-18. TROUBLESHOOTING-AFTER REMOVAL FROM
3-16. TROUBLESHOOTING-BEFORE REMOVAL OR
When the malfunction of a transmission is not
ascertained by tests or inspections before removal from
a. Visual Inspection. Do not operate the vehicle
the vehicle, the transmission may be mounted in a test
prior to completing the procedures described in this
stand and checked (if a test stand is available). Particular
paragraph. Inspect for oil leakage. V i s u a l l y inspect a
attention should be given to proper oil level and to correct
11 splitlines, plugs, all hose and tube connections at the
linkage adjustment in every transmission test.
transmission and cooler. Oil leakage at split-lines may be
caused by loose mounting bolts or defective gaskets.
Tighten all bolts, plugs, and connections where leakage
The troubleshooting information, below, outlines
is found. Check to insure that the modulator control cable
the possible causes of transmission troubles and their
and linkage are free.
remedies. Capital letters indicate the symptom; numerals
b. System Knowledge.
The engine and
following the symptom indicate several p o s i b 1 e
transmission must be regarded a s a single package
causes; corresponding numerals in the right column
during troubleshooting. A thorough study of the
indicate remedies for the causes.
description and operation of the components and
hydraulic system will be helpful in determining the cause