Dodge RAM TRUCK 1500 1995 Service Manual page 101

2 • 26 FRONT SUSPENSION AND AXLE - B R
DISCONNECT AXLE/SHIFT MOTOR DIAGNOSIS
T W O - W H E E L DRIVE OPERATION D I A G N O S I S
FOUR-WHEEL DRIVE
INDICATOR LIGHT WILL
NOT G O OUT W H E N
TRANSFER CASE SELECTOR
IS MOVED FROM 4H TO
2H P O S I T I O N .
RAISE VEHICLE S O ALL
FOUR W H E E L S ARE
FREE TO ROTATE.
INSPECT INDICATOR
SWITCH A N D W I R I N G O N
SHIFT MOTOR H O U S I N G
FOR DAMAGE A N D
SHORT-CIRCUIT.
REPAIR AS NECESSARY.
Y E S
i
START E N G I N E DEPRESS BRAKE
PEDAL. PLACE TRANSFER
CASE SELECTOR IN 2H POSITION
A N D T R A N S M I S S I O N IN
DRIVE (AUTOMATIC) OR FIRST
GEAR (MANUAL). EASE OFF FROM
BRAKE A N D LET W H E E L S ROTATE
SLOWLY.
TEST COMPLETE
FRONT DRIVE
SHAFT DOES
NOT ROTATE.
FRONT DRIVE
SHAFT ROTATES.
FOUR-WHEEL DRIVE
INDICATOR LIGHT
R E M A I N S O N .
INSPECT TRANSFER
CASE LINKAGE.
PLACE T R A N S M I S S I O N
IN NEUTRAL.
TEST FOR VACUUM
IN VACUUM H O S E
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
B E T W E E N 10-20 I N . HG.)
TEST FOR VACUUM
IN VACUUM H O S E
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
B E T W E E N 10-20 I N . HG.)
DICONNECT THE
SHIFT MOTOR VACUUM
H O S E S .
TEST FOR VACUUM
IN VACUUM H O S E
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
B E T W E E N 10-20 I N . HG.)
DICONNECT THE
SHIFT MOTOR VACUUM
H O S E S .
TEST FOR VACUUM
IN VACUUM H O S E
THAT CONNECTS TO
INBOARD SHIFT
MOTOR PORT.
(VACUUM SHOULD BE
B E T W E E N 10-20 I N . HG.)
CHECK TRANSFER
CASE. REPAIR
A S NECESSARY.
N O VACUUM
OR L O W VACUUM.
1
INSPECT INTAKE MANIFOLD
VACUUM SUPPLY H O S E C O N N E C T I O N ,
TRANSFER CASE VACUUM SWITCH
C O N N E C T I O N , VACUUM RESERVOIR,
A N D SHIFT SYSTEM VACUUM H O S E S
FOR PROPER C O N N E C T I O N , RESTRICTION,
AIR LEAKS, A N D DAMAGE. REPAIR OR REPLACE
A S NECESSARY.
VACUUM OK
~ " T ~
STOP E N G I N E
CONNECT A VACUUM
PUMP TO THE INBOARD
SHIFT MOTOR PORT.
APPLY 15 I N . H G
VACUUM A N D ROTATE
RIGHT W H E E L .
FRONT AXLE
DISCONNECTS.
INSPECT VACUUM
H O S E S FOR AIR LEAKS, KINKS, ETC.
REPAIR A S NECESSARY.
FRONT AXLE
DOES NOT
DISCONNECT.
REMOVE SHIFT MOTOR
H O U S I N G COVER. CONNECT
VACUUM PUMP TO
SHIFT MOTOR PORT.
REPLACE SHIFT MOTOR
IF ARMATURE DOES
NOT MOVE IN A N D OUT
FREELY.
FRONT AXLE
WILL NOT DISCONNECT.
J9002-95
REMOVE SHIFT MOTOR H O U S I N G
COVER. INSPECT SHIFT FORK,
COLLAR, A N D AXLE SHAFTS.
REPAIR OR REPLACE A S
NECESSARY.