John Deere stx38 - Manual (Page 156)

4 - 72
3/21/97
TESTS AND ADJUSTMENTS ELECTRICAL
PTO CLUTCH AIR GAP
STX30 & STX38 (SN —210000)
Reason:
To set the PTO clutch air gap at a specific dimension
for proper operation.
Procedure:
1. Put transaxle in neutral.
2. Put key switch and PTO switch in off position.
3. Engage park brake.
4. Insert feeler gauge through slot (A) in brake plate to
check PTO clutch air gap. Gauge should be
between clutch armature and rotor. Check air gap
at all three slots.
Specifications:
PTO clutch air gap
Warner. . . . . . . . 0.38—0.64 mm (0.015—0.025 In.)
Ogura. . . . . . . . . 0.30—0.51 mm (0.012—0.020 in.)
Results:
• If the PTO clutch air gap is not correct, adjust lock
nut (B) until the feeler gauge begins to bind
between the armature and rotor. Use a sweeping
motion with feeler gauge while making this
adjustment. DO NOT overtighten nut.
• Repeat procedure on other two adjusting nuts.
• Engage and disengage the PTO clutch several
times. Recheck adjustment.
FLYWHEEL MAGNETS
Reason:
To make sure flywheel magnet(s) have enough force to
induce current in ignition coil and stator.
Equipment:
• Screwdriver
Procedure:
1. Park machine on level surface and turn key switch
OFF.
2. Shift lever in NEUTRAL and park brake LOCKED.
3. Remove flywheel housing and flywheel from engine.
4. Place screwdriver about 25 MM (1 in.) from
magnets.
Results:
• If screwdriver pulled into magnet, flywheel is good.
• If screwdriver is NOT pulled into magnet, flywheel
is bad and should be replaced.
M51973
B
A
M55884
M55883