Hydraulic Pressure Test; Control Valve And Governor Test - Jeep 1979 CJ-5 Technical & Service Manual

AUTOMATIC TRANgffliSSON
2C-9
1-Range—Overrun Braking
(1) Shift transmission into 2-range and increase ve-
hicle speed to 30-40 mph (48-64 km/h).
(2) Close throttle and shift transmission, into 1-
range. A 2-1 downshift should occur at 40-20 mph (64-32
km/h). A 2-1 downshift at closed throttle will be accom-
panied by increased engine rpm, and an engine braking
effect should be noticed.
NOTE: If a pressure test gauge has been installed, line
pressure should be approximately 150 psi (1 084 kPa)
after downshifting.
Reverse Range
(1) Shift transmission into reverse.
(2) T r a n s m i s s i o n should engage in ..reverse
promptly when gearshift lever is moved to R.
(3) Accelerate vehicle lightly and check reverse
operation.
HYDRAULIC PRESSURE TEST
WARNING: Do not permit anyone to stand in front of
or at the rear of the vehicle during the pressure test.
; (1) Check and correct fluid level.
(2) Check and adjust manual linkage if necessary.
(3) Check engine performance. A poorly tuned en-
gine will affect transmission operation adversely.
(4) Raise vehicle on twin post-type hoist or hoist
that will allow all wheels to rotate freely.
(5) Connect Oil Pressure Test Gauge J-5907 to
transmission and connect tachometer to engine. Refer to
Test Gauge Installation Chart.
(6) Lower vehicle and position tachometer and oil
pressure gauge so they can be viewed from drivers seat.
(7) Raise hoist until vehicle wheels are at least 10-12
inches off floor. Do not raise vehicle completely.
(8) Shift transmission into Park and start engine.
(9) Apply parking brakes and wheel brakes firmly.
CAUTION: Until noted otherwise, do not perform any
of the following test steps unless the wheel brakes are
firmly applied.
(10) Shift transmission into neutral and increase en-
gine speed to 1000 rpm. Record gauge pressure and close
throttle. Pressure should be 55-70 psi (379-483 kPa).
(11) Shift transmission into D-range and record
pressure with engine at hot idle speed. Pressure should
be 60-85 psi (413-586 kPa).
(12) With transmission still in D-range, increase en-
gine speed to 1000 rpm. Record gauge pressure and close
throttle. Pressure should be 60-90 psi (413-620 kPa).
(13) Shift transmission into 1-range and increase en-
gine speed to 1000 rpm. Record gauge pressure and close
throttle. Pressure should be 135-165 psi (931-1 138 kPa).
(14) Shift transmission into reverse and increase en-
gine speed to 1000 rpm. Record gauge pressure and close
throttle. Pressure should be 95-150 psi (655-1 034 kPa).
(15) Shift transmission into D-range. Increase en-
gine speed to 1000 rpm, and activate detent switch under
dash. Record gauge pressure, close throttle, deactivate
switch, and shift transmission into neutral. Pressure
should be 90-110 psi (620-758 kPa).
NOTE: A wire hop can be used to activate the detent
switch for this test step. Wrap the loop around the
switch contact arm and pull the arm rearward until the
switch contacts close.
(16) Shift transmission into D-range and release
brakes but do not open throttle. Record gauge pressure
when speedometer registers approximately 30 mph with
throttle closed. Pressure should be 55-70 psi (379-483
kPa).
(17) If complaint is based on delayed or erratic shifts
or no 2-3 upshift, check governor and control valve oper-
ation. Refer to Control Valve and Governor Test.
(18) If line pressures recorded are well above speci-
fied pressures, refer to Control Valve and Governor
Test-High Line Pressure.
(19) Consult pressure test analysis chart, hydraulic
flow charts, and diagnosis charts and guides to analyse
results of pressure test.
CONTROL VALVE AND GOVERNOR TEST
(1) Position vehicle on twin post hoist or hoist that
will allow all wheels to rotate freely when hoist is raised.
(2) Connect tachometer to engine.
(3) Raise vehicle.
(4) Connect Oil Pressure Test Gauge J-5907 to
transmission.
(5) Disconnect and plug modulator vacuum line.
(6) Lower vehicle.
(7) Position oil pressure test gauge and tachometer
so they can be viewed from drivers seat.
(8) Raise vehicle until vehicle wheels are 10-12
inches (25-30 cm) off floor.
(9) Shift transmission into Park and start engine.
NOTE: Do not apply the brakes during this test
(10) Shift transmission into D-range and increase
engine speed to 1000 rpm. Record line pressure and close
throttle. Pressure should be 60-90 psi (413-620 kPa).
(11) Slowly increase engine speed to 3000 rpm and
check for line pressure drop as follows:
(a) If line pressure drops 10 psi (69 kPa) or more
at 3000 rpm, remove, disassemble, clean and inspect
control valve assembly.
(b) If line pressure drop is less than 10 psi (69
kPa) at 3000 rpm, remove and inspect governor for stuck
valve, sticking weight(s), restricted valve orifice, in-
sufficient valve entry and exhaust port minimum clear-
ance of 0.020 inch (0.50 mm), restricted or damaged