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TM 10-3930-671-24
7.3. Transmission Pressure Checks
Test Preparation ............................................................................ F-327
Pressure Test Procedure .............................................................. F-327
Pressure Specifications ................................................................. F-327
Pressure Check Points .................................................................. F-327
Test Preparation
Before making any transmission pressure checks,
please
refer
to
Section
7.2
Transmission
Troubleshooting.
IMPORTANT Be sure that:
1)
Transaxle fluid level is correct and oil
warmed to operating temperature.
2)
All
mechanical
checks
have
been
completed.
NOTE
To perform this service procedure, it
is recommended that you first:
•
Put blocks under the upright rails and raise
the drive wheels off the floor.
•
Return all controls to neutral.
•
Block the steer wheels.
•
Apply the parking brake to prevent drive
wheel movement.
Minimum Tools Required
•
It is recommended to use a hydraulic
transmission test manifold, or conventional
pressure gauge with 0-300 Ps pressure
range, w/hose and fittings.
•
Tachometer
Pressure Test Procedure
Making a transmission pressure check consists of
installing a pressure gauge into the hydraulic circuit at
the proper test point, operating the system at the
specified conditions, and recording the pressure reading.
Compare the test pressure readings to the design
specifications, and refer to the troubleshooting
guide, Section 7.2, for diagnosis of the probable
trouble.
1. Open the engine compartment and remove the
floorboards
to
provide
access
to
the
transmission check points.
2. Install the tachometer.
3. Clean the transmission in the areas of the
pressure check point plugs. Be careful to
prevent dirt and contaminants from entering
check ports.
4. Remove the plug and install pressure gauge into
each respective check port where pressure is to
be measured.
5. Clutch pressure is measured with the respective
clutch engaged. Put the directional control
(FORWARD or REVERSE) lever, or speed
control (LOW) lever in correct position for
engagement of clutch being tested.
IMPORTANT Do not apply service brake while making
clutch pressure checks. Use of the service brakes (w/
inching) will release clutch pressure and prevent
accurate pressure readings.
6. Start and operate engine at the specified
speed(s) while taking the pressure readings.
7. Make a record of each pressure reading for your
reference.
8. When each pressure check is completed, stop
the engine, remove pressure gauge, and install
and tighten the plug in the check port.
9. When all pressure checks have been completed,
remove tachometer, replace any components
that may have been removed for access to the
check points, install floorboards, close engine
compartment, lower drive wheels to floor, and
remove blocks.
Pressure Specifications
Refer to Transaxle Model on following pages. Also refer
to GROUP 2, Service Specifications, for transmission
model being checked.
Pressure Check Points
Refer to Transaxle Model on following pages.
F-327
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