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The A604: Clutch Air Pressure Test
You can test the condition of the clutches with the Clutch Air Pressure test.
This test, according to the FSM you need to be able to supply 30 psi of clean, dry air and you'd need Tool 6056 (special A604 testing tool- check the dealer on cost). This test requires more skill than the other and should be used in my opinion, only after electrical problems have been ruled out.
1) Remove oil pan and valve body.
2) Attach the air test tool
3) Now test the Overdrive Clutch by sending the air (pressure mentioned above) into the OD hole in the test tool (it should be marked, if not its the left of the 3 holes). You should be able to see the push/pull piston move forward and then back to where it started when air pressure is removed.
4) For reverse, send the air to the reverse circuit via the reverse hole in the test plate/tool. You should be able to see the push/pull piston move rearward and then back to where it started when the air pressure is removed.
5) For 2/4, send the air in hydrolic feed hole which is where the 2/4 clutch retainer is, look where the 2/4 piston touches the seperator plate and you should be able to see the piston move rearward then back when air pressure is removed.
6) For UD clutch, you cant see it operate so testing is a lil harder. Basically you're gonna be engaging the 2/4 and UD clutches using air- which *should* lock the output shaft. Using a piece of rubber hose and pliers- turn the input shaft. It should NOT rotate by hand. Release air and it should be able to be rotated.