HYDRAULIC PRESSURE TESTS



Pressure testing is a very important step in the diagnostic procedure. These tests usually reveal the cause of most transmission problems.

Before performing pressure tests, be certain that fluid level and condition, and shift cable adjustments have been checked and approved. Fluid must be at operating temperature, 65.5°-93° C (150°-200° F).

Install an engine tachometer, raise vehicle on hoist which allows the wheels to turn, and position tachometer so it can be read.

Using Adapter Set L-4559, attach 300 psi Pressure Gauge(s) C-3293SP to the port(s) required for test being conducted.

Test port locations are shown in the  Pressure Taps graphic.


TEST ONE - SELECTOR IN MANUAL 1 (1st Gear)

NOTE: This test checks pump output, pressure regulation and condition of the low/reverse clutch hydraulic circuit and shift schedule.






TEST TWO - SELECTOR IN MANUAL 2 (Second Gear)

NOTE: This test checks the underdrive clutch hydraulic circuit as well as the shift schedule.






TEST TWO A - SELECTOR IN DRIVE (OD ON - Fourth Gear)

NOTE: This test checks the underdrive clutch hydraulic circuit as well as the shift schedule.






TEST THREE - SELECTOR IN DRIVE (OD OFF - Third and Second Gear)

NOTE: This test checks the overdrive clutch hydraulic circuit as well as the shift schedule.








TEST FOUR - SELECTOR IN DRIVE (OD ON - Fourth Gear)

NOTE: This test checks the 2/4 clutch hydraulic circuit.






TEST FIVE-SELECTOR IN DRIVE (OD ON - Fourth Gear, CC on)

NOTE: These tests check the torque converter clutch hydraulic circuit.




CAUTION: Both wheels must turn at the same speed.








TEST SIX-SELECTOR IN REVERSE

NOTE: This test checks the reverse clutch hydraulic circuit.






TEST RESULT INDICATIONS





STEP 6
STEP 4

ALL PRESSURE SPECIFICATIONS ARE PSI (on hoist, with wheels free to turn)

Gear Selector Position
  		Actual Gear
  		PRESSURE TAPS
  
Underdrive Clutch
  		Overdrive Clutch
  		Reverse Clutch
  		Torque Converter Clutch Off
  		Torque Converter Clutch On
  		2/4 Clutch
  		Low/Reverse Clutch
  		    
PARK - 0 mph *
  		PARK
  		0-2
  		0-5
  		0-2
  		60-110
  		45-100
  		0-2
  		115-145
  
REVERSE - 0 mph *
  		REVERSE
  		0-2
  		0-7
  		165-235
  		50-100
  		35-85
  		0-2
  		165-235
  
NEUTRAL - 0 mph *
  		NEUTRAL
  		0-2
  		0-5
  		0-2
  		60-110
  		45-100
  		0-2
  		115-145
  
Low - 20 mph #
  		FIRST
  		110-145
  		0-5
  		0-2
  		60-110
  		45-100
  		0-2
  		115-145
  
Third - 30 mph #
  		SECOND
  		110-145
  		0-5
  		0-2
  		60-110
  		45-100
  		115-145
  		0-2
  
Third - 45 mph #
  		DIRECT
  		75-95
  		75-95
  		0-2
  		60-90
  		45-80
  		0-2
  		0-2
  
OD - 30 mph #
  		OVERDRIVE
  		0-2
  		75-95
  		0-2
  		60-90
  		45-80
  		75-95
  		0-2
  
OD - 50 mph #
  		OVERDRIVE WITH TCC
  		0-2
  		75-95
  		0-2
  		0-5
  		60-95
  		75-95
  		0-2
  
* Engine Speed at 1500 rpm
  
# CAUTION: Both wheels must be turning at same speed.