Exmark STARIS S Series Operator's Manual page 37

1. Stop engine, wait for all moving parts to stop, and
remove key or spark plug wire(s). Engage parking
brake.
2. Lift and lock the thigh pad. Remove and retain
the rear guard.
3. Place a catch pan under the hydro filter which is
located near the right rear tire.
4. Carefully clean area around filter. It is important
that no dirt or contamination enter hydraulic
system.
5. Unscrew filter to remove and allow oil to drain
from reservoir.
Important: Before reinstalling new filter, fill
it with Exmark Premium Hydro oil and apply
a thin coat of oil on the surface of the rubber
seal.
Turn filter clockwise until rubber seal contacts the
filter adapter, then tighten the filter an additional
2/3 to 3/4 turn.
6. Fill reservoir as stated in Check Hydraulic Oil
Level.
Exmark Premium Hydro Oil is recommended.
Refer to the chart for an acceptable alternative:
Hydro Oil
Exmark Premium Hydro
Oil (Preferred)
Mobil 1 15W50
*May need more often under severe conditions.
7. Loosen filter 1/2 turn and allow a small amount
of oil to leak from the oil filter (this allows air to
be purged from the oil filter and supply hose from
the hydraulic reservoir). Turn filter clockwise
until rubber seal contacts the filter adapter. Then
tighten the filter an additional 2/3 to 3/4 turn.
8. Raise the rear of machine up and support with
jack stands (or equivalent support) just high
enough to allow drive wheels to turn freely.
Service Interval
After first 250 hours
*Every 500 hours/Yearly
thereafter
After first 250 hours
*Every 250 hours/Yearly
thereafter
CAUTION
Raising the mower for service or maintenance
relying solely on mechanical or hydraulic
jacks could be dangerous. The mechanical or
hydraulic jacks may not be enough support
or may malfunction allowing the unit to fall,
which could cause injury.
Do Not rely solely on mechanical or hydraulic
jacks for support. Use adequate jack stands
or equivalent support.
9. Start engine and move throttle control ahead to
full throttle position. Move RH motion control
leversinward (together) and move both levers
forward with equal pressure, and run for one
minute. Shut down the machine, allow the hydros
to cool and recheck oil level.
If either drive wheel does not rotate, one or both
of the charge pumps (located on the top of the
main pump as shown in Figure 22) may have lost
their "prime". Refer to Hydraulic System Air
Purge section.
10. Reinstall the rear guard and lower the thigh pad.
11. Remove the jack stands.
Note: Do Not change hydraulic system oil (except
for what can be drained when changing filter), unless
it is felt the oil has been contaminated or been
extremely hot.
Changing oil unnecessarily could damage hydraulic
system by introducing contaminates into the system.
Hydraulic System Air Purge
Service Interval: As required
Air must be purged from the hydraulic system
when any hydraulic components, including oil
filter, are removed or any of the hydraulic lines are
disconnected.
The critical area for purging air from the hydraulic
system is between the oil reservoir and each
charge pump located on the top of each variable
displacement pump (Figure 22). Air in other parts of
the hydraulic system will be purged through normal
operation once the charge pump is "primed".
37
Maintenance