AT-64 A340E(Others) AUTOMATIC TRANSMISSION - FORWARD CLUTCH SST AT7843 3. CHECK PACK CLEARANCE OF FORWARD CLUTCH Using SST and a dial indicator, measure the forward clutch piston stroke while applying and releasing com- pressed air (392-785 kPa, 4-8 kgf/cm2, 57-114 psi). SST 09350-30020 (09350-06120) Pack clearance: 0.5-0.9 mm (0.020-0.035 in.) If the values are non-standard, inspect the discs. AT8176 4. REMOVE FLANGE, PLATES AND DISCS (a) Using a screwdriver, remove the snap ring from the for- ward clutch drum. (b) Remove the flange, plates and discs. AT8177 5. REMOVE CUSHION PLATE SST AT8436 6. REMOVE PISTON RETURN SPRING (a) Place SST on the spring retainer and compress the return spring with a shop press. SST 09350-30020 (09350-07040) (b) Using snap ring pliers, remove the snap ring. (c) Remove the piston return spring. AT8178 7. REMOVE FORWARD CLUTCH PISTON (a) Place the forward clutch drum onto the O/D support. (b) Hold the forward clutch piston with hand, apply com- pressed air to the O/D support to remove the forward clutch piston. (c) Remove the forward clutch piston. (d) Remove the 2 O-rings from the piston.