Walker MDD (20.9 HP) - Manual (Page 56)

Maintenance Instructions
LUBRICATION
52
Mower Deck Gearbox Lubrication
NOTE: These instructions apply to all mower
decks with gear-driven blades. Refer to DSD52 or
DSD62 Mower Deck Lubrication in this section for
the DSD52 or DSD62 deck with belt-driven blades.
The mower deck gearboxes (tee gearbox and blade
drive gearboxes) are connected as a unitized as-
sembly, and oil flows freely between them. The gear-
boxes are permanently lubricated (oil filled) and
sealed requiring no scheduled lubrication.
However, the gearbox oil seals should be checked
every 25 hours for indication of an oil leak; partic-
ularly the lower seals on the blade drive gearboxes
should be inspected, since they operate in a dirty en-
vironment. If an oil leak is noted, replace the oil seal
and relubricate the gearbox assembly as follows:
1. Remove gearbox cover (footrest). Deck orien-
tation should be the normal operating position.
Mower Deck Gearboxes
(shown with gearbox cover removed for clarity)
2. Clean the area around the individual gearbox
cover plates to prevent contaminants from en-
tering the gearcase.
3. Remove the screws securing the cover plates
on the blade drive gearboxes.
4. Check the level of lubricant in the gearboxes. If
the lubricant is low, add SAE E.P. (Extreme
Pressure) 90W oil until the oil level is up to (sub-
merges) the horizontal shaft in the gearbox
(shaft parallel to cover plate).
NOTE: In case the gearboxes are completely
drained of oil, approximately 5 fl. oz. (15 cl) of oil
per gearbox is required to refill the gear drive
assembly.
NOTE: Since the gearboxes are connected as
a unit by connector tubes, it is necessary to add
oil slowly. Allow a few minutes after adding oil
for the oil to flow throughout the assembly and
the oil level to stabilize before reassembly.
IMPORTANT: DO NOT overfill the deck gear-
boxes. The gearbox assembly is not vented,
and overfilling with oil will cause excessive pres-
sure and result in oil leaks.
5. Check condition of the cover gasket and replace
if worn or damaged. Reinstall gearbox cover
plates; torque screws to 24 in-lb (2.7 N·m).
DSD52 or DSD62 Mower Deck Lubrication
There are several special lubrication requirements
for the DSD52 or DSD62 mower deck in addition to
the requirements detailed in the Chassis and Deck
Lubrication illustration. Lubricate the locations
shown in the Blade Spindle Lubrication and Gear-
box, Dolly Wheel, and U-Joint Lubrication photos
and check and maintain oil in the belt drive gearbox.
1. Lubricate the blade spindles every 25 hours
with two (2) shots of SAE general purpose lithi-
um or molybdenum base grease.
Blade Spindle Lubrication
Blade Drive
Gearboxes
Tee
Gearbox
Blade
Spindles