John Deere stx38 - Manual (Page 250)

6 - 18
3/21/97
DIAGNOSIS HYDROSTATIC POWER TRAIN
DIAGNOSIS
Test Conditions:
• Tractor on level surface. • Front wheels blocked.
• Engine OFF. • Rear wheels raised off surface with axle housings
on jack stands.
Test/Check Point Normal If Not Normal
1. Drive belt Belt in good condition, not glazed, split,
unraveled, or stretched. Replace drive belt as needed.
2. Fan Fan in good condition and tight. Tighten fan. Repair or replace as
needed.
3. Sheaves and idlers Drive sheaves and idlers in good condition
and adjusted properly. Adjust idler assembly. Repair or
replace as needed.
4. Tensioning spring Tensioning spring and anti-vibration hose
(early models only) installed and not
damaged. Install spring and hose (if
equipped). Repair or replace as
needed.
5. Shift linkage Shift linkage adjusted properly and working
smoothly. Adjust as needed. Repair or
replace as needed.
6. Brake linkage and
assembly.
Brake and brake linkage adjusted properly
and working smoothly.
Brake components not worn or damaged.
Adjust as needed. Repair or
replace as needed.
Repair or replace as needed.
7. Neutral return linkage. Neutral return linkage adjusted properly
and working smoothly. Adjust as needed. Repair or
replace as needed.
8. Hydro housing exterior. No cracks, leaks, or loose hardware. Tighten hardware. Repair or
replace transaxle housing.
Replace any damaged
components.
9. Axles Axles straight.
Keys and keyways all in good shape.
Repair or replace as needed.
Repair or replace as needed.
10. Internal hydro
components.
No worn, scored or scratched components.
Correct type and quantity of oil. Oil not dirty
or burnt.
Retaining snap rings in good shape and
seated correctly.
Repair or replace as needed.
Fill to proper level. Replace with
correct or unburned oil.
Repair or replace as needed.
11. Transport (free
wheeling) valve and
linkage.
Transport linkage engaging and
disengaging properly. Adjust. Repair or replace as
needed.
12. Wheels and tires. Air pressure equal in driving tires.
Driving tires have same radii.
Wheels not bent or out of round.
Adjust air pressure.
Match tires for same radii.
Repair or replace wheels as
necessary.