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Figure 27
1. Right side guard
4.
Place a catch pan under the hydraulic filter.
5.
Carefully clean the area around filter. It is
important that no dirt or contamination enters
hydraulic system.
6.
Unscrew the filter to remove and allow the oil to
drain from the reservoir.
Important:
Before reinstalling new filter, fill
it with Toro Hypr-Oil 500 and apply a thin
coat of oil on the surface of the rubber seal.
Turn the filter clockwise until the rubber seal
contacts the filter adapter, then tighten the filter
an additional 2/3 to 3/4 turn.
7.
Fill the reservoir as stated in
Hydraulic Oil Level (page 35)
Toro Hypr-Oil 500 is recommended. Refer to the
chart for an acceptable alternative:
Hydro Oil
Toro Hypr-Oil 500 (Preferred)
Mobil 1 15W50
*May need more often under severe conditions.
8.
Loosen the 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 the filter
clockwise until the rubber seal contacts the filter
adapter. Then tighten the filter an additional 2/3
to 3/4 turn.
9.
Raise the rear of machine up and support with
jack stands (or equivalent support) just high
enough to allow drive wheels to turn freely.
g446593
Checking the
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.
10.
Start the engine and move the throttle control
ahead to the full throttle position. Move the
motion control levers inward (together) and
move both levers forward with equal pressure,
and run for one minute. Shut down the machine,
allow the hydraulic components to cool and
recheck the 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
lost their "prime". Refer to
Purge (page 36)
11.
Install the right side guard.
12.
Remove the jack stands.
Note:
Do not change the 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
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
28). Air in other parts of the hydraulic
system will be purged through normal operation once
the charge pump is "primed".
36
Figure
28) may have
Hydraulic System Air
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