John Deere stx38 - Manual (Page 73)

4/23/97
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ENGINE REPAIR
GOVERNOR INSPECTION
1. Measure outside diameter of control arm shaft.
Replace if not within specification.
Governor Control Arm Specifications:
O.D. (New) . . . 5.975—6.000 mm (0.2352—0.2362 in.)
Wear Limit. . . . . . . . . . . . . . . . 5.962 mm (0.2347 in.)
2. Measure inside diameter of crankcase bore (A).
Governor Control Arm Crankcase Bore Specs:
I.D. (New). . . . 6.025—6.050 mm (0.2372—0.2382 in.)
Wear Limit. . . . . . . . . . . . . . . . 6.063 mm (0.2387 in.)
3. Determine governor control arm shaft-to- bore
clearance. Replace governor shaft/gear assembly
as necessary.
Governor Control Arm-to-Crankcase Bore Specs:
Clearance . . . 0.025—0.075 mm (0.0010—0.0030 in.)
4. Inspect flyweights (B) for proper operation and free
movement. Replace governor shaft/gear assembly
as necessary.
IMPORTANT: DO NOT remove governor shaft with
vise-grips or pliers, damage to case may result.
5. With a small punch, CAREFULLY drive governor
shaft toward inside of crankcase to remove it.
6. From inside of crankcase, install new governor
shaft/gear assembly by pressing or lightly tapping
shaft into crankcase bore to specified height (C).
Governor Gear Shaft Specifications:
Height (C)
. . . . . . . . . . 32.639—32.842 mm (1.285—1.293 in.)
Diameter (New)
. . . . . . . . . . 5.990—6.000 mm (0.2358—0.2362 in.
Diameter (Wear Limit)
. . . . . . . . . . . . . . . . . . . . . . . . 5.977mm (0.2353 in.)
REMOVE PISTON ASSEMBLY
1. Remove balance shaft, and camshaft.
IMPORTANT: Remove carbon ridge, if present,
from cylinder before removing piston.
2. Remove carbon ridge, if present at top of cylinder,
using a ridge reamer.
3. Remove cap screws (A) to remove cap (B) from
connecting rod (C).
4. Remove piston assembly through top of cylinder.
5. Inspect piston assembly, see following two topics.
M52105
M52106
A
B
M42195
C
Inside of Crankcase
Shaft
To Remove
M55875
C
B
A