John Deere stx38 - Manual (Page 72)

3 - 40
4/23/97
REPAIR ENGINE
BALANCER SHAFT INSPECTION
1. Inspect shaft for cracks and broken teeth. Replace
shaft if cracked or damaged.
2. Measure journals (A). Replace if not within
specification.
Balancer Shaft Journal O. D. Specification
New . . . . . . 19.962—19.975 mm (0.7859—0.7864 in.)
Wear Limit. . . . . . . . . . . . . . . 19.959 mm (0.7858 in.)
3. Measure balancer shaft bore (B) in crankcase.
4. Subtract journal OD. from bore ID. to determine
clearance with balancer shaft journal. Replace
crankcase if measurements are not within
specifications.
Balancer Shaft Crankcase Bore Specifications:
ID (New)
. . . . . . . . 20.000—20.025 mm (0.7874—0.7884 in.)
Wear Limit. . . . . . . . . . . . . . . 19.959 mm (0.7858 in.)
Balancer Shaft to Crankcase Bore Clearance
. . . . . . . . . . 0.025—0.063 mm (0.0009—0.0025 in.)
5. Measure balancer shaft bore (C) in oil pan.
6. Determine clearance with balancer shaft journal.
Replace oil pan if measurements not within
specifications.
Balancer Shaft Oil Pan Bore Specifications:
ID (New). . . 20.000—20.025 mm (0.7874—0.7884 in.)
Wear Limit. . . . . . . . . . . . . . . 19.959 mm (0.7858 in.)
Balancer Shaft to Crankcase Bore Clearance
. . . . . . . . . . . . 0.025—0.063 mm (0.0009—0.0025 in.)
GOVERNOR REMOVAL &
INSTALLATION
1. Remove governor lever (not shown) from end of
control arm (E).
2. Remove spring clip (F), washers (C), and governor
control arm (A) from inside of crankcase.
3. Remove and discard seal (D).
NOTE: Check governor shaft/gear assembly, if plastic
gear, flyweight assembly, flyweight cap, and/or
shaft are damaged, the complete assembly
must be replaced.
4. Inspect governor shaft/gear assembly (B), replace
as necessary (see Replace Governor Shaft/Gear
Assembly, later in this group).
5. Install governor shaft/gear assembly.
6. Install new seal (D) using suitable driver.
7. Install control arm, washers, and clip.
8. Install lever (not shown).
M52100
A
M52101
A
B
M52102
C
E
F
C
C
B
M52104
D
A