Troubleshooting – John Deere stx38 User Manual
Page 248
6 - 16
3/21/97
TROUBLESHOOTING
HYDROSTATIC POWER TRAIN
TROUBLESHOOTING
Problem or
Symptom
Drive belt jumping off or
Lack of drive in one or both
directions
Loses power under load, belt
slips, or erratic drive
Jerky or aggressive engagement
Cannot get full forward speed
Cannot get full reverse speed
Returns to neutral during
operation or under load
Shifts hard
Noisy operation
Leaking lubricant
Brakes will not stop tractor
Park brake will not hold
Transaxle overheats
Transport mode pushes hard
Loss of hydro drive or reduced
power—Noisy
Check or
Solution
Drive belt sheaves and
idlers loose, out of
adjustment, worn, or
damaged—tighten,
replace, or adjust properly
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Drive belt worn, frayed,
glazed, or stretched—
replace belt
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Bellcrank tensioning
spring weak or broken—
replace as necessary
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Brake pedal linkage out of
adjustment—adjust
properly
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Brake system
components worn, bent,
or broken—replace and
adjust properly
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Shift lever linkage bent,
worn, out of adjustment,
or broken—replace or
adjust properly
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Neutral return linkage
worn, bent, or broken—
replace as necessary
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Input sheave, input shaft,
and axle keys or keyways
loose, worn, or
damaged—replace as
necessary
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Internal hydro transaxle
components worn,
stripped, or broken—
replace as necessary
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Internal hydro pump and/
or motor cylinder block
and valve plate mating
surfaces worn or scored—
replace as necessary
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