Vertical Shaft Seal Replacement
Refer to Figure 15.
1.Disconnect and remove the driveline from the gearbox.
2.Remove vent plug (15) and siphon gear lube from housing through this opening.
3.Remove gearbox stand from mower deck.
4.Remove gearbox and pulley from stand (2).
5.Remove vertical shaft seal. Replace with new seal (see Seal Replacement, page 21).
Vertical seal should be recessed in housing. Hori- zontal seal should be pressed flush with outside of housing.
NOTE: Distortion to seal cage or damage to seal lip will cause seal to leak.
6.Fill gearbox with SAE 80W or 90W gear lube until it runs out the level plug.
7.Assemble gearbox and pulley to gearbox stand. Attach gearbox stand to mower deck.
Horizontal Shaft Seal Replacement
1.Disconnect and remove the driveline from the gearbox.
2.Remove vent plug (27), Figure 16, and siphon gear lube from housing through this opening.
3.If the leak occurred at either end of horizontal shaft, remove oil cap (11) and/or oil seal (1). Replace with new one (see Seal Replacement, page 21).
4.Fill gearbox with SAE 80W or 90W gear lube until it runs out the level plug.
Remove Gearbox from Mower
1.Disconnect and remove the rear driveline from the gearbox.
2.Remove vent plug (15), Figure 15, and siphon gear lube from housing through this opening.
3.Remove gearbox stand (2) from mower deck by removing four hex screws (8).
4.Remove four cap screws (14) and washers (13) and remove shield (12) from gearbox.
5.Remove castle nut (6) and hardware from output shaft of gearbox.
6.Remove sheave (3) from gearbox.
7.Remove four bolts (10) that attach gearbox to gearbox stand and remove gearbox.
Disassemble Gearbox
1.Remove top cover (28), Figure 16, from housing. Turn gearbox upside down and pour out remaining gear oil from gearbox.
2.Remove oil cap (11) (to be replaced).
3.Remove snap ring (10) and shim (9) from input shaft (5).
4.Support gearbox in hand press and push on input shaft (5) to remove bearing (8).
5.Remove gear (7) from inside housing.
6.Remove oil seal (1) from front of housing (to be replaced).
7.Remove snap ring (2) and shim (3) from front of housing.
8.Remove input bearing (4) by using a punch and hammer from outside of housing.
9.Support housing in vise in a horizontal position.
10.The castle nut (23) and cotter pin (24) are already removed with the drive sheave. Remove the snap ring (18), washer (20), and seal (19).
11.Remove output shaft (12) and bearings by using a punch and hammer and tap on top to drive down.
12.Inspect gears for broken teeth and wear. Some wear is normal and will show on laded side. Forged gear surfaces are rough when new. Check that wear pattern is smooth.
13.Inspect vertical and horizontal shafts for grooves, nicks, or bumps in the areas where the seals seat. Resurface any damage with emery cloth.
14.Inspect housing and caps for cracks or other damage.
Reassemble Gearbox (RD60, RD74 shown, RDC54 similiar)
Refer to Figure 16.
NOTE: Repair to this gearbox is limited to replacing bearings, seals, and gaskets. Replacing gears, shafts, and a housing is not cost effective. Purchasing a com- plete gearbox is more economical.
1.Clean housing, paying special attention to areas where seals will be installed.
2.Wash housing and component thoroughly. Select a clean area for gearbox assembly. Replace all seals and bearings. All parts must be clean and lightly oiled before reassembling.
MAN0260 (8/6/2004) | Dealer Service 23 |
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