DEALER SERVICE Cont’d
Remove Gearbox
1.Disconnect drive shaft and remove key from key- way.
2.Remove belt and remove gear stand from mower.
3.Turn gear stand over. There are two set screws in the split taper bushing; remove them. Insert one set screw into the threaded bushing hole and tighten to force bushing and pulley apart.
4.Remove gearbox from stand.
Repair Gearbox Leak
Permatex®a sealant is used on the outer diameter of the seals. Substitute seals may not meet original equipment specifications and could cause leakage.
1.Clean gearbox exterior to remove all foreign material. When opening, use care to prevent foreign material from entering gearbox.
2.To repair horizontal seal, vertical shaft, or leakage between cover and gearbox, remove vent plug and drain gear lube from box.
3.Remove leaking seal and replace (refer to Install Seal, page 25). Use care to prevent rolling the seal lip under.
4.Replace gasket between cover and gearbox.
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5 3
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6
DB3449A | 2 | 7 |
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Figure 19 Gearbox Repair
a. Permatex is a registered trademark of the Permatex Corporation.
Install Seal
Proper seal installation is important. An improperly | 3. Place seal squarely on housing | |
installed seal will leak and could result in bearing fail- | toward inside of gearbox). Select a seal driver, a | |
ure. | piece of pipe or tubing with an OD that will set on out- | |
1. Clean areas in housing where seal outer diameter | side edge of seal but will clear housing. A driver that | |
is too small will bow seal cage and ruin seal. | ||
seats. Inspect gear shafts. Pay specific attention to | ||
4. Carefully press seal into housing, preventing dis- | ||
areas where seals seat. Check for cracks, grooves, | ||
nicks or bumps. Replace housing or shaft if damage | tortion to metal seal cage. Seat vertical seal flush with | |
cannot be repaired by resurfacing with emery cloth. | housing and horizontal seal against shoulder in hous- | |
2. Lubricate seal lip and carefully guide over shaft | ing. | |
Distortion to seal case or damage to seal lip will | ||
using a blunt tool such as a letter opener. Be careful | ||
not to roll seal lip under. Do not use a knife as it will | cause seal to leak. Remove and replace seals dam- | |
nick and ruin seal. | aged in installation. | |
| 5. Check for proper vent plug operation and fill gear- | |
| box with 8 oz. of SAE 90W gear lube. |
MAN0137 (9/14/01) | Dealer Service 25 |
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