Exmark 4500-370 - Manual (Page 16)

Maintenance
5. Remove small magnetic plugs and wipe away any
material accumulated on the plugs.
6. Apply a Teflon pipe sealant to all small magnetic
plugs and re-install into the gearbox.
7. Re-install the gearbox and drive shaft assembly
to the mower deck.
8. Fill gearbox with Mobil SHC (synthetic) 75W-90
gear lube oil until level with oil drain/fill plug.
Each of the gearbox sections must be filled
separately.
Note: Mower deck should remain level to the
ground when filling gearbox with oil. Do Not fill
gearbox with deck raised in the service position.
9. Apply a Teflon pipe sealant to the 3 large oil plugs
and re-install into the gearbox.
Lubricate Grease Fittings
Note: See chart for service intervals.
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
2. Lubricate fittings with NGLI grade #2
multi-purpose gun grease.
Refer to the following chart for fitting locations
and lubrication schedule.
Lubrication Chart
Fitting
Locations
Initial
Pumps
Number of
Places
Service
Interval
1. Drive
Shaft 1 3 40 Hours
2. Front
Caster
Wheel Hub 1 2 8 Hours
3. Deck
Flip-Up 1 4 100 Hours
4. Push
Arm Tubes 1 2 100 Hours
5. Front
Caster
Pivots *0 2 *Yearly
* See step 3 for special lubrication instructions on
the front caster pivots and the Lubricate Caster
Wheel Hubs section for special lubrication
instructions on the front casters wheel hubs.
3. Lubricate caster pivots once a year. Remove hex
plug and cap. Thread grease zerk in hole and
pump with grease until it oozes out around top
bearing. Remove grease zerk and thread plug back
in. Place cap back on.
Lubricate Caster Wheel Hubs
Service Interval: Yearly
1. Stop engine, wait for all moving parts to stop, and
remove key. Engage parking brake.
Figure 14
1. Seal guard 2. Spacer nut with wrench
flats
2. Remove caster wheel from caster forks.
3. Remove seal guards from the wheel hub.
4. Remove one of the spacer nuts from the axle
assembly in the caster wheel. Note that thread
locking adhesive has been applied to lock the
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