Suzuki Grand Vitara XL-7 Service Manual page 494

7) Using special tool and hydraulic press, compress forward clutch
piston return spring and remove retaining return spring.
Special tool (A): 09926-98310
CAUTION:
Be careful when applying pressure, for overpressure will
cause plate section of piston return spring to deform.
8) Remove forward clutch piston return spring.
9) Install forward clutch to O/D case. Blow low pressure air into
fluid hole at the right of cut in O/D case to remove forward clutch
piston.
INSPECTION
Forward Clutch Piston
D Shake piston to check that ball is not stuck.
D Blow low pressure air to check ball section for leakage.
Forward Clutch Piston Return Spring
D Measure free length.
Standard free length of forward clutch piston return spring:
19.21 mm (0.756 in.)
AUTOMATIC TRANSMISSION (4 A / T) 7B1-89