Dodge RAM TRUCK 1500 1995 Service Manual page 1393

21 - 110 42RH/46RH/47RH TRANSiiSSiON DIAGNOSIS AND TESTING
Fig. S Pressure Test Port Locations
HYDRAULIC PRESSURE TEST PROCEDURE
Connect a tachometer to the engine, Position the
tachometer so it can be observed from under the ve­
hicle. Raise the vehicle on hoist that will allow the
wheels to rotate freely.
Test One—Transmission In 1 Range
This test checks pump output, pressure regu­
lation, and condition of the rear clutch and
servo circuit. Test Gauges C-3292 and C-3293-SP
are required for this test.
(1) Connect 100 psi Gauge C-3292 to accumulator
port.
(2) Connect 300 psi Gauge C-3293-SP to rear servo
port.
(3) Disconnect throttle valve cable and gearshift
rod from transmission levers.
(4) Start and run engine at 1000 rpm.
(5) Move transmission shift lever (on manual lever
shaft) all the way forward into 1 range.
(6) Move transmission throttle valve lever from full
forward to full rearward position and note pressures
on both gauges.
(7) Line pressure at accumulator port should be
54-60 psi (372-414 kPa) with throttle lever forward
and gradually increase to 90-96 psi (621-662 kPa) as
lever is moved rearward.
(8) Rear servo pressure should be same as line
pressure within 3 psi (20.68 kPa).
Test Two—Transmission In 2 Range '
This test checks pump output and pressure
regulation. Use 100 psi Test Gauge C-3292 for
this test.
(1) Connect test gauge to accumulator pressure
port.
(2) Start and run engine at 1000 rpm.
(3) Move transmission shift lever (on valve body)
one detent rearward from full forward position. This
is 2 range.
(4) Move transmission throttle lever from full for­
ward to full rearward position and read pressure at
both gauges.
(5) Line pressure should be 54-60 psi (372-414
kPa) with throttle lever forward and gradually in­
crease to 90-96 psi (621-662 kPa) as lever is moved
rearward.
Test Three—Transmission In D Range Third Gear
This test checks pressure regulation and con­
dition of the clutch circuits. Use both pressure
Test Gauges C-3292 and C-3293-SP for this test.
(1) Turn overdrive selector switch to OFF position.
(2) Connect test gauges to accumulator and front
servo ports (Fig. 3). Use either test gauge at the two
ports.
(3) Start and run engine at 1600 rpm for this test.
(4) Move selector lever two detents rearward from
full forward position. This is D range.
(5) Read pressures on both gauges as transmission
throttle lever is moved from full forward to full rear­
ward position.
(6) Line pressure at accumulator in D range third
gear, should be 54-60 psi (372-414 kPa) with throttle
lever forward and gradually increase as lever is
moved rearward.
(7) Front servo pressure in D range third gear,
should be same as line pressure within 3 psi (21 kPa)
up to downshift point.
Test Four—Transmission In Reverse
This test checks pump output, pressure regu­
lation and the front clutch and rear servo cir­
cuits. Use 300 psi Test Gauge C-3293-SP for this
test.
(1) Connect 300 psi gauge to rear servo port.
(2) Start and run engine at 1600 rpm for test.
(3) Move transmission shift lever four detents rear­
ward from full forward position. This is Reverse
range.
(4) Move transmission throttle lever all way for­
ward then all way rearward and note gauge read­
ings.
(5) Pressure should be 145 - 175 psi (1000-1207
kPa) with lever forward and increase to 230 - 280 psi