15
2010 ST-8410
Gearbox Assembly Procedure
1. The output assembly goes into the housing first. If the upper bearing race has been pulled
out it must be pressed in. The lower bearing must be pressed onto the shaft before installa-
tion.
2. Once the output shaft is in place, install the upper bearing, shims, gear, and retaining nut.
3. The bearing preload is measured by rolling torque. The rolling torque should be between 6-
15 inch pounds. Adjust the retaining nut until you reach this rolling torque. Secure the re-
taining nut with the cotter pin.
4. The bearing race for the front bearing on the input shaft must be pressed in. Outer retaining
ring should be installed in the gearbox housing. Make sure the shims are installed between
the retaining ring and race as necessary.
5. Place the input shaft through the back of the gearbox while holding the gear in place. Slide
the shaft through the gear and press into the front bearing. Ensure the shaft to bearing retain-
ing ring is installed on the front of the input shaft. Install the gear to shaft retaining ring.
6. Press bearing onto the back of the shaft. Be sure to replace any shims that were removed
during disassembly. Press race partway into the back of the gearbox housing. Install the cap
on the back of the housing using the appropriate gasket and tighten the bolts to 38 ft-lb.
7. Check contact pattern of gear set with marking compound. Contact is to be in the central
toe area of the gear teeth with a minimum 50% tooth height and 50% tooth length in con-
tact. The back lash should be between 0.006” and 0.022” when measured at the pitch diame-
ter of the gear set. If the gear mesh or back lash are incorrect use shims reposition the gears.
8. The bearing preload is measured in the same manner as for the output shaft. The rolling
torque should be between 11-25 inch pounds. Install thicker gaskets to decrease the rolling
torque and thinner gaskets to reduce the rolling torque.
9. Once the preload is set, install the output spacer, seal, retaining ring, and seal protector. In-
stall the input seal in the housing. Remove the blank cap and apply sealant to the gaskets
and replace the cap. Torque the bolts back to 38 ft-lb.
10. Replace the inspection cover on the top of the gearbox and torque the bolts to 20 ft-lbs.
11. Fill the gear box with the recommended lubricant in an upright position similar to the
mounting position. Fill the gearbox to the level plug.
Summary of Contents for ST-8410
Page 1: ...2010 540 RPM ST 8410 OPERATIOR S MANUAL AND PARTS BOOK 7 FOOT ROTARY CUTTERS ...
Page 5: ...5 2010 ST 8410 Decals Part Numbers and Placement ...
Page 17: ...17 2010 ST 8410 Partsbook ...
Page 20: ...20 2010 ST 8410 5548 Gear Box See Maintenance Section for Required Lubrication ...
Page 22: ...22 2010 ST 8410 4038 Complete Drive Shaft for Lift Type ...
Page 30: ...30 2010 ST 8410 ...
Page 31: ...31 2010 ST 8410 Optional Equipment and Other Items not Illustrated ...
Page 36: ...36 2010 ST 8410 5450 Main Drive Shaft ...
Page 38: ...38 2010 ST 8410 5009 Jackshaft For Pull Type ...
Page 56: ......
Page 57: ...57 2010 ST 8410 Notes ...
Page 58: ......
